Tag Archives: java

ElasticsearchStatusException[Elasticsearch exception [type=search_phase_execution_exception, reason=all shards failed]]

Phenomenon
When doing a position search using elasticsearch, an error is reported.
ElasticsearchStatusException[Elasticsearch exception [type=search_phase_execution_exception, reason=all shards failed]]

I am using GeoDistanceQueryBuilder for ElasticSearch’s geolocation search and sorting

Searching
Later, I logged in to the elasticsearch server to check the error logs and found the following errors.

That is, my location is not of the geo_point type, and this problem has been troubleshooting for quite a while.
The reason for the problem is simple, it is because my index is automatically created by IndexRequest and there will be problems.

For example.

 String string = JSONObject.fromObject(entity).toString();
            IndexRequest indexRequest = new IndexRequest(INDEX).type(DOC).id(INDEX + "_" + entity.getId()).source(string, XContentType.JSON);

            bulkRequest.add(indexRequest);

Solution:
Create the index manually, or through Java code. Be sure to note that the type of the attribute corresponding to the mapping must be geo_point to work

Here I change the index, position means position information

# use java to manually create the index

public class CreateElsIndexMain {

    static final String INDEX_NAME = "t_els_mock";

    @Test
    public void test() throws Exception {
        RestHighLevelClient client = new RestHighLevelClient(RestClient.builder(
                new HttpHost(
                        "127.0.0.1",
                        9200,
                        "http"
                )));
        boolean exists = checkExists(client);
        if (exists) {
            deleteIndex(client);
        }
        createIndex(client);

    }

    public static boolean checkExists(RestHighLevelClient client) throws Exception {
        GetIndexRequest existsRequest = new GetIndexRequest();
        existsRequest.indices(INDEX_NAME);
        boolean exists = client.indices().exists(existsRequest, RequestOptions.DEFAULT);
        return exists;
    }

    public static void createIndex(RestHighLevelClient client) throws Exception {
        Settings.Builder setting = Settings.builder().put("number_of_shards", "5").put("number_of_replicas", 1);
        XContentBuilder mappings = JsonXContent.contentBuilder().
                startObject().startObject("properties").startObject("id").field("type", "text").endObject().
                startObject("name").field("type", "keyword").endObject().
                startObject("createTime").field("type", "keyword").endObject().
                startObject("score").field("type","keyword").endObject().
                startObject("longitude").field("type","float").endObject().
                startObject("latitude").field("type","float").endObject().
                startObject("position").field("type","geo_point").endObject().endObject().endObject();
        CreateIndexRequest request = new CreateIndexRequest(INDEX_NAME).settings(setting).mapping("doc",mappings);
        CreateIndexResponse createIndexResponse = client.indices().create(request, RequestOptions.DEFAULT);
        System.out.println(createIndexResponse);
    }


    public static void deleteIndex(RestHighLevelClient client) throws Exception {
        DeleteIndexRequest deleteIndexRequest = new DeleteIndexRequest();//To delete an index, also create an object to accept the index name
        deleteIndexRequest.indices(INDEX_NAME);//pass the index name
        //execute the delete method for deletion.
        AcknowledgedResponse delete = client.indices().delete(deleteIndexRequest, RequestOptions.DEFAULT);
    }

}

Kibana data

We can use the test data to put the data into es and view the data of the index through kibana’s dev tools, as shown in the following example:

Code to add data to es


 @Autowired
    private RestHighLevelClient client;

    private static final String INDEX = "t_els_mock";

    String DOC = "doc";

public void addData(){
        BulkRequest bulkRequest = new BulkRequest();
        List<MockLocationEntity> entities = getEntities();
        for (MockLocationEntity entity : entities){
            String string = JSONObject.fromObject(entity).toString();
            IndexRequest indexRequest = new IndexRequest(INDEX).type(DOC).id(INDEX + "_" + entity.getId()).source(string, XContentType.JSON);

            bulkRequest.add(indexRequest);
        }
        try {
            BulkResponse bulk = client.bulk(bulkRequest, RequestOptions.DEFAULT);
            
        } catch (IOException e) {
        }
    }

    private static List<MockLocationEntity> getEntities(){
        List<MockLocationEntity> list = new ArrayList<>();

        MockLocationEntity one = new MockLocationEntity();
        one.setId(UUID.randomUUID().toString());
        one.setName("YuanYan GuoJi");
        one.setScore("10");
        one.setCreateTime("20220322145900");
        one.setLongitude(117.20);
        one.setLatitude(38.14);
        one.setPosition(one.getLatitude() + "," +one.getLongitude());


        MockLocationEntity two = new MockLocationEntity();
        two.setId(UUID.randomUUID().toString());
        two.setName("WenGuang DaSha");
        two.setScore("9");
        two.setCreateTime("20220322171100");
        two.setLongitude(116.01);
        two.setLatitude(38.89);
        two.setPosition(two.getLatitude() + "," +two.getLongitude());


        MockLocationEntity three = new MockLocationEntity();
        three.setId(UUID.randomUUID().toString());
        three.setName("NeiMengGu JiuDian");
        three.setScore("8");
        three.setCreateTime("20220322171101");
        three.setLongitude(117.99);
        three.setLatitude(39.24);
        three.setPosition(three.getLatitude() + "," +three.getLongitude());


        MockLocationEntity four = new MockLocationEntity();
        four.setId(UUID.randomUUID().toString());
        four.setName("GuoXianSheng");
        four.setScore("10");
        four.setCreateTime("20220322171102");
        four.setLongitude(117.20);
        four.setLatitude(39.50);
        four.setPosition(four.getLatitude() + "," +four.getLongitude());
        Location fourLocation = new Location();


        MockLocationEntity five = new MockLocationEntity();
        five.setId(UUID.randomUUID().toString());
        five.setName("NongYe YinHang");
        five.setScore("8");
        five.setCreateTime("20220322171103");
        five.setLongitude(116.89);
        five.setLatitude(39.90);
        five.setPosition(five.getLatitude() + "," +five.getLongitude());
        Location fiveLocation = new Location();

        MockLocationEntity six = new MockLocationEntity();
        six.setId(UUID.randomUUID().toString());
        six.setName("XingBaKe");
        six.setScore("9");
        six.setCreateTime("20220322171104");
        six.setLongitude(117.25);
        six.setLatitude(39.15);
        six.setPosition(six.getLatitude() + "," +six.getLongitude());


        MockLocationEntity seven = new MockLocationEntity();
        seven.setId(UUID.randomUUID().toString());
        seven.setName("JuFuYuan");
        seven.setScore("6");
        seven.setCreateTime("20220322171104");
        seven.setLongitude(117.30);
        seven.setLatitude(39.18);
        seven.setPosition(seven.getLatitude() + "," +seven.getLongitude());

        list.add(one);
        list.add(two);
        list.add(three);
        list.add(four);
        list.add(five);
        list.add(six);
        list.add(seven);

        return list;
    }

Failed to restart redis-server.service Unit not found [How to Solve]

Failed to restart redis-server. service: Unit not found.

1. Problem description

Redis-5.0.5 is compiled and installed on CentOS 7.8. The port is 6579. The following error occurs when restarting:

# systemctl start redis
Redirecting to /bin/systemctl restart redis-server.service
Failed to restart redis-server.service: Unit not found.

2. Cause analysis

This is because during compilation and installation, redis registers the service name redis_6579, and the full service name is required for startup.

3. Correct startup mode

# systemctl start redis_6579
or
# service redis_6579 start

Android connection to cloud MySQL error: java.lang.NoClassDefFoundError Failed resolution of LjavasqlSQLType

The error information is as follows:

E/AndroidRuntime: FATAL EXCEPTION: Thread-4
    Process: com.example.NCEPU, PID: 19597
    java.lang.NoClassDefFoundError: Failed resolution of: Ljava/sql/SQLType;
        at com.mysql.cj.jdbc.DatabaseMetaData.getInstance(DatabaseMetaData.java:746)
        at com.mysql.cj.jdbc.ConnectionImpl.getMetaData(ConnectionImpl.java:1170)
        at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:447)
        at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246)
        at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:197)
        at java.sql.DriverManager.getConnection(DriverManager.java:580)
        at java.sql.DriverManager.getConnection(DriverManager.java:218)
        at com.example.NCEPU.Utils.MySQLUtil$1.run(MySQLUtil.java:20)
        at java.lang.Thread.run(Thread.java:929)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "java.sql.SQLType" on path: DexPathList[[zip file "/data/app/com.example.NCEPU-ONfkLzQBKVHb0mVXKR3p5g==/base.apk"],nativeLibraryDirectories=[/data/app/com.example.NCEPU-ONfkLzQBKVHb0mVXKR3p5g==/lib/arm64, /data/app/com.example.NCEPU-ONfkLzQBKVHb0mVXKR3p5g==/base.apk!/lib/arm64-v8a, /system/lib64, /system/product/lib64, /hw_product/lib64, /system/product/lib64]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:196)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
        at com.mysql.cj.jdbc.DatabaseMetaData.getInstance(DatabaseMetaData.java:746) 
        at com.mysql.cj.jdbc.ConnectionImpl.getMetaData(ConnectionImpl.java:1170) 
        at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:447) 
        at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246) 
        at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:197) 
        at java.sql.DriverManager.getConnection(DriverManager.java:580) 
        at java.sql.DriverManager.getConnection(DriverManager.java:218) 
        at com.example.NCEPU.Utils.MySQLUtil$1.run(MySQLUtil.java:20) 
        at java.lang.Thread.run(Thread.java:929) 
W/libEGL: EGLNativeWindowType 0x6f3882b950 disconnect failed
I/Process: Sending signal. PID: 19597 SIG: 9

Problem analysis: the jar package version of MySQL is too high. I used the latest version: mysql-connector-java-8.0.21.jar, loading driver:

Class.forName("com.mysql.cj.jdbc.Driver");
String url = "jdbc:mysql://yourip:port/sheetname?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC";
connection = DriverManager.getConnection(url, user, password);

Problem solved: jar version lower, here I used the official website to download mysql-connector-java-5.1.49.jar, note that after changing to a lower version to load the driver to become.

Class.forName("com.mysql.jdbc.Driver");

SSH Connect Service Error: Could not connect to ‘xxx.xxx.xx.xx‘ (port 22): Connection failed.

It was strange to report an error when connecting to SSH service this morning

I have searched a lot of information from Baidu. Now I collect and sort out some useful solutions for you

1. Restart CentOS
2 Restart VMware
3 Firewall problem:
solution:
(1) check the firewall: Service iptables status
(2) close the firewall first: /etc/init.d/iptables stop
(3) open firewall: Service iptables start
Start: systemctl start firewalld (centos7 user)
Close: systemctl stop firewalld (centos7 user)
4 Query whether port 22 is enabled

Query all open port commands

  firewall-cmd --zone=public --list-ports

Permanently open port 22

  firewall-cmd --zone=public --add-port=80/tcp --permanent

Reload

firewall-cmd --reload

5. Query whether SSH is installed on the Linux server

yum install openssh-server

6. Query whether SELinux is started
modify the file in /etc/selinux/config and set SELINUX = disabled:

Failed to configure a DataSource: ‘url‘ attribute is not specified and no embedded datasource could [Solved]

Failed to configure a DataSource: ‘url’ attribute is not specified and no embedded datasource could be configured.
Error Messages:

***************************
APPLICATION FAILED TO START
***************************

Description:

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

Reason: Failed to determine a suitable driver class


Action:

Consider the following:
	If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
	If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).

Solution:

You need to add a configuration in your project’s POM file

<build>
	<resources>
        <!-- Resolving mapper binding exceptions -->
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.yml</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
        <!-- Resolve profile exceptions such as data source not found -->
        <resource>
            <directory>src/main/resources</directory>
            <includes>
                <include>**/*.yml</include>
            </includes>
        </resource>
    </resources>
</build>

How to Solve Spring integrate Seata startup error

This error was found in the startup project for a long time, that is, the dependency is not correct
factory method 'globaltransactionscanner' threw exception; nested exception is io. seata. common. exception. NotSupportYetException: not support register type: null

My spring dependent version

			
			<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.1.10.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Greenwich.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.1.0.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>

Replace the Seata dependency with this one and start successfully

		
		<dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>io.seata</groupId>
                    <artifactId>seata-spring-boot-starter</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-seata</artifactId>
            <version>2.1.0.RELEASE</version>
            <exclusions>
                <exclusion>
                    <groupId>io.seata</groupId>
                    <artifactId>seata-all</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-all</artifactId>
            <version>1.4.2</version>
        </dependency>
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-spring-boot-starter</artifactId>
            <version>1.4.2</version>
        </dependency>

[Solved] webService Error: webservice Interface call error reported.

webservice Interface call error reported.

org.apache.axis2.AxisFault: Unmarshalling Error: Unexpected element (uri: "http://service
s.bingosoft.net/", local: "arg1"). The required elements are <{}arg5>,<{}arg4>,<{}arg3>,<{}arg2>,
<{}arg1>,<{}arg0>

Solution:
When the return parameter is hashMap, the error is reported, not to return hashMap successful call, did not understand what the reason, the webService underlying is not introduced hashMap
return Map can write a map in the entity class will return normally

mybatis “case when” Error: Failed to process, please exclude the tableName or statementId.

Encountered when using case when in mybatis for condition filtering judgment

Failed to process, please exclude the tableName or statementId.

Such error messages are syntax errors
but I have no problem running SQL statements on the MySQL command line

//case when
WHERE dept.type = 1
AND 
(
CASE agent.dept_type
WHEN "agent" THEN dept.id=30
END
)
//When the agent's dept_type is "agent", the judgment that dept.id = 30 will be added

There is no problem running this SQL statement on the command line, but an error will be reported if it is executed on mybatis

//Modified
WHERE dept.type = 1
AND dept.id=
(
CASE agent.dept_type
WHEN "agent" THEN 30
END
)

Later, put dept.id outside to solve this problem

20190718 – Supplementary record: another problem is encountered. If the dept table is associated query, there may be no data. When the dept has no data, we can’t assign any parameters to dept.id and can’t affect the query of the data in the original table. I changed it to the following:

//Modified
WHERE dept.type = 1
AND (dept.id=
(
CASE agent.dept_type
WHEN "agent" THEN 30
ELSE 0
END
) or dept.id is null)

Add the judgment that dept.id is empty
(there are many ways to solve it in MySQL statements, but an error will be reported on mybatis – – |)

2019-7-30-supplementary notes:
if it is an empty string, you can’t use "" but change it to single quotation mark ''

CASE WHEN *** THEN ***
ELSE ""  =>Need to change to=> ELSE''

[Solved] Springboot Error: Error creating bean with name ‘xxxController‘

Problem description

Today, we are integrating mybatis with springboot, and an error is reported at runtime:

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userController': Unsatisfied dependency expressed through field 'userService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userServiceImpl': Unsatisfied dependency expressed through field 'baseMapper'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userMapper' defined in file [E:\IDEA Project\demo\target\classes\com\example\demo\mapper\UserMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [com/baomidou/mybatisplus/autoconfigure/MybatisPlusAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [E:\IDEA Project\demo\target\classes\mapper\VersionMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [E:\IDEA Project\demo\target\classes\mapper\VersionMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.libv.entity.Version'.  Cause: java.lang.ClassNotFoundException: Cannot find class: com.libv.entity.Version
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:659) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:953) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918) ~[spring-context-5.3.16.jar:5.3.16]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.16.jar:5.3.16]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.6.4.jar:2.6.4]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:740) [spring-boot-2.6.4.jar:2.6.4]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:415) [spring-boot-2.6.4.jar:2.6.4]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-2.6.4.jar:2.6.4]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1312) [spring-boot-2.6.4.jar:2.6.4]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1301) [spring-boot-2.6.4.jar:2.6.4]
	at com.example.demo.DemoApplication.main(DemoApplication.java:18) [classes/:na]
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userServiceImpl': Unsatisfied dependency expressed through field 'baseMapper'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userMapper' defined in file [E:\IDEA Project\demo\target\classes\com\example\demo\mapper\UserMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [com/baomidou/mybatisplus/autoconfigure/MybatisPlusAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [E:\IDEA Project\demo\target\classes\mapper\VersionMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [E:\IDEA Project\demo\target\classes\mapper\VersionMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.libv.entity.Version'.  Cause: java.lang.ClassNotFoundException: Cannot find class: com.libv.entity.Version
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:659) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1389) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1309) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:656) ~[spring-beans-5.3.16.jar:5.3.16]
	... 20 common frames omitted
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userMapper' defined in file [E:\IDEA Project\demo\target\classes\com\example\demo\mapper\UserMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [com/baomidou/mybatisplus/autoconfigure/MybatisPlusAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [E:\IDEA Project\demo\target\classes\mapper\VersionMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [E:\IDEA Project\demo\target\classes\mapper\VersionMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.libv.entity.Version'.  Cause: java.lang.ClassNotFoundException: Cannot find class: com.libv.entity.Version
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireByType(AbstractAutowireCapableBeanFactory.java:1534) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1417) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1389) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1309) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:656) ~[spring-beans-5.3.16.jar:5.3.16]
	... 34 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [com/baomidou/mybatisplus/autoconfigure/MybatisPlusAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [E:\IDEA Project\demo\target\classes\mapper\VersionMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [E:\IDEA Project\demo\target\classes\mapper\VersionMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.libv.entity.Version'.  Cause: java.lang.ClassNotFoundException: Cannot find class: com.libv.entity.Version
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1389) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1309) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireByType(AbstractAutowireCapableBeanFactory.java:1519) ~[spring-beans-5.3.16.jar:5.3.16]
	... 45 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [E:\IDEA Project\demo\target\classes\mapper\VersionMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [E:\IDEA Project\demo\target\classes\mapper\VersionMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.libv.entity.Version'.  Cause: java.lang.ClassNotFoundException: Cannot find class: com.libv.entity.Version
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.3.16.jar:5.3.16]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ~[spring-beans-5.3.16.jar:5.3.16]
	... 58 common frames omitted
Caused by: org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [E:\IDEA Project\demo\target\classes\mapper\VersionMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [E:\IDEA Project\demo\target\classes\mapper\VersionMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.libv.entity.Version'.  Cause: java.lang.ClassNotFoundException: Cannot find class: com.libv.entity.Version
	at com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean.buildSqlSessionFactory(MybatisSqlSessionFactoryBean.java:595) ~[mybatis-plus-extension-3.4.0.jar:3.4.0]
	at com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean.afterPropertiesSet(MybatisSqlSessionFactoryBean.java:431) ~[mybatis-plus-extension-3.4.0.jar:3.4.0]
	at com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean.getObject(MybatisSqlSessionFactoryBean.java:628) ~[mybatis-plus-extension-3.4.0.jar:3.4.0]
	at com.baomidou.mybatisplus.autoconfigure.MybatisPlusAutoConfiguration.sqlSessionFactory(MybatisPlusAutoConfiguration.java:214) ~[mybatis-plus-boot-starter-3.3.1.jar:3.3.1]
	at com.baomidou.mybatisplus.autoconfigure.MybatisPlusAutoConfiguration$$EnhancerBySpringCGLIB$$1a37b21a.CGLIB$sqlSessionFactory$2(<generated>) ~[mybatis-plus-boot-starter-3.3.1.jar:3.3.1]
	at com.baomidou.mybatisplus.autoconfigure.MybatisPlusAutoConfiguration$$EnhancerBySpringCGLIB$$1a37b21a$$FastClassBySpringCGLIB$$a0eb9858.invoke(<generated>) ~[mybatis-plus-boot-starter-3.3.1.jar:3.3.1]
	at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244) ~[spring-core-5.3.16.jar:5.3.16]
	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:331) ~[spring-context-5.3.16.jar:5.3.16]
	at com.baomidou.mybatisplus.autoconfigure.MybatisPlusAutoConfiguration$$EnhancerBySpringCGLIB$$1a37b21a.sqlSessionFactory(<generated>) ~[mybatis-plus-boot-starter-3.3.1.jar:3.3.1]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_322]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_322]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_322]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_322]
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.3.16.jar:5.3.16]
	... 59 common frames omitted
Caused by: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [E:\IDEA Project\demo\target\classes\mapper\VersionMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.libv.entity.Version'.  Cause: java.lang.ClassNotFoundException: Cannot find class: com.libv.entity.Version
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:123) ~[mybatis-3.5.5.jar:3.5.5]
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.parse(XMLMapperBuilder.java:95) ~[mybatis-3.5.5.jar:3.5.5]
	at com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean.buildSqlSessionFactory(MybatisSqlSessionFactoryBean.java:593) ~[mybatis-plus-extension-3.4.0.jar:3.4.0]
	... 72 common frames omitted
Caused by: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.libv.entity.Version'.  Cause: java.lang.ClassNotFoundException: Cannot find class: com.libv.entity.Version
	at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:118) ~[mybatis-3.5.5.jar:3.5.5]
	at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:76) ~[mybatis-3.5.5.jar:3.5.5]
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:138) ~[mybatis-3.5.5.jar:3.5.5]
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:131) ~[mybatis-3.5.5.jar:3.5.5]
	at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:121) ~[mybatis-3.5.5.jar:3.5.5]
	... 74 common frames omitted
Caused by: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.libv.entity.Version'.  Cause: java.lang.ClassNotFoundException: Cannot find class: com.libv.entity.Version
	at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:120) ~[mybatis-3.5.5.jar:3.5.5]
	at org.apache.ibatis.builder.BaseBuilder.resolveAlias(BaseBuilder.java:149) ~[mybatis-3.5.5.jar:3.5.5]
	at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:116) ~[mybatis-3.5.5.jar:3.5.5]
	... 78 common frames omitted
Caused by: java.lang.ClassNotFoundException: Cannot find class: com.libv.entity.Version
	at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:200) ~[mybatis-3.5.5.jar:3.5.5]
	at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:89) ~[mybatis-3.5.5.jar:3.5.5]
	at org.apache.ibatis.io.Resources.classForName(Resources.java:261) ~[mybatis-3.5.5.jar:3.5.5]
	at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:116) ~[mybatis-3.5.5.jar:3.5.5]
	... 80 common frames omitted

Cause analysis:

When I first saw this error report, I guessed that the bean was not successfully created. I also searched various answers on the Internet. Some said that @ service might not be added to the service layer. I looked at it for no reason, so I began to read the error information

Look directly at the error reported in the first line, because the first line is likely to be the main reason for the error:

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userController': Unsatisfied dependency expressed through field 'userService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userServiceImpl': Unsatisfied dependency expressed through field 'baseMapper'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userMapper' defined in file [E:\IDEA Project\demo\target\classes\com\example\demo\mapper\UserMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [com/baomidou/mybatisplus/autoconfigure/MybatisPlusAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [E:\IDEA Project\demo\target\classes\mapper\VersionMapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [E:\IDEA Project\demo\target\classes\mapper\VersionMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.libv.entity.Version'.  Cause: java.lang.ClassNotFoundException: Cannot find class: com.libv.entity.Version

I’ll take this long paragraph wrong and look at it in pieces
at first, I thought it was the problem of userController, then carefully check whether it was not, and then look back:

nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'userServiceImpl'

I went to see userServiceImpl again and didn’t find any problems, so I was wondering if I understood the error in this paragraph, so I searched the meaning of nest. It turned out that there was nesting besides nesting! That is to say, the error reporting in this paragraph is actually an exception nested with another exception ! In other words, it is the innermost error that causes the error of each layer above, thus throwing an exception! So I went straight to the back part:

nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [E:\IDEA Project\demo\target\classes\mapper\VersionMapper.xml]'. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'com.libv.entity.Version'.  Cause: java.lang.ClassNotFoundException: Cannot find class: com.libv.entity.Version

Found to be VersionMapper.xml has a problem because of Error resolving class, That is to say, there is a problem with one class. Look at the last: Cannot find class: com.libv.entity.Version.
I went to see XML again:

<mapper namespace="com.libv.mapper.VersionMapper">
    <insert id="release" parameterType="com.libv.entity.Version">
        insert into version(id,version,download_url,release_time)
        values (#{id},#{version},#{downloadUrl},NOW())
    </insert>
</mapper>

Now I understand, because I don’t have com.libv.entity this bag! That is, the wrong path of my Version class leads to errors in XML, resulting in layer-by-layer exceptions.

Solution:

Change the directory path of the corresponding class of parameterType in XML

<mapper namespace="com.example.demo.mapper.VersionMapper">
    <insert id="release" parameterType="com.example.demo.Entity.Version">
        insert into version(id,version,download_url,release_time)
        values (#{id},#{version},#{downloadUrl},NOW())
    </insert>
</mapper>

Run again, success!

Wildfly (JBoss) startup error: ERROR [org.jboss.as.controller.management-operation] (Controller Boot Thread) WFLYCTL0013: Operation (“add”) failed

Error content:

15:07:50,724 ERROR [org.jboss.as.controller.management-operation] (Controller Boot Thread) WFLYCTL0013: Operation ("add") failed - address: ([("deployment" => "MESwell.ear")]) 
- failure description: "WFLYCTL0212: Duplicate resource [(\"deployment\" => \"MESwell.ear\")]"

15:07:50,728 FATAL [org.jboss.as.server] (Controller Boot Thread) WFLYSRV0056: Server boot has failed in an unrecoverable manner; exiting. See previous messages for details.

Error reporting scenario:

This error occurs when I start it normally for the first time, and then turn it off. When I start it for the second time, it will fail to start. Many answers were searched on the Internet, but they failed. Later, I found this answer:

[wfcore-495] wfly won’t startup due to “wflyctl0212: duplicate resource [(\” deployment \ “= & gt; \” XXX. War \ “)] – red hat issue tracker

Through this answer, I know that it must be related to the nonstandard start-up operation of my second time. The nonstandard start-up led to the existence of the cache started last time. Then I searched wildfly how to clean up the cache.

Here is the Solution:

1. Find the package you put under \wildfly-10.1.0.Final\standalone\deployments\, check its startup status, and delete the files generated after the startup failure. (It seems to be fine without cleaning up)

2. Delete all files under \wildfly-10.1.0.Final\standalone\data

3、Go to \wildfly-10.1.0.Final\standalone\configuration and find your standalone.xml

Search for deployment, find a string of tags like the following generated, delete!

4. After executing the appeal operation, check whether the above three steps are not clear and clean

5. Restart your wildfly (JBoss)

[Solved] IDEA Start Project Error: Error running ‘xxxxxx‘: Command line is too long. Shorten command line for …..

Error in idea startup item: error running ‘XXXXXX’: command line is too long Shorten command line for xxxxxx or also for Spring Boot default configuration?

Error reason: this error may be reported when the newly pulled code is started after the idea is opened

Solution: just find the following line in workspace.xml file of the .idea folder:

< component name="PropertiesComponent"> ······</component>

Add a line in the middle

< property name="dynamic.classpath" value="true" />

The problem can be solved

[Solved] Error:(3, 46) java: Program Package org.springframework.context.annotation does not exist

This bug should only appear in idea2020
Error:(3, 46) java: Program Package org.springframework.context.annotation does not exist

First, open the file in the upper left corner of the idea, and then click settings

Then click build, execution, deployment > Build Tools > Maven > Runner
check delegate ide build/run actions to Maven

The problem will be solved easily
in addition, warm tips: only idea2020 will have this error, and there are many hidden bugs in 2020. It is recommended to upgrade to idea2021 as soon as possible

ProgrammerAH

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