Tag Archives: java

[Solved] JAVA Connect rabbitMQ Error: An unexpected connection driver error occured

Rabbitmq cannot be connected in the Java project. The error content is as follows:

ERROR com.rabbitmq.client.impl.ForgivingExceptionHandler.log(ForgivingExceptionHandler.java:119) - An unexpected connection driver error occured

An unexpected connection driver error occurred

Most likely, the newly created user is not authorized

1. You need to confirm that the default port 15672 is the port browsed by the browser after MQ is installed on the server, it needs to be configured as 5672 in the project.

2. Creating a new user requires authorization.
adding a user

Or

After the creation is successful, click the newly created user

User authorization

Then you can connect with the newly created user

The yellow No access will change to /, which indicates that the authorization is successful.

How to Solve Swagger Always Displays “basic-error-controller” Issue

The main reason is that the controller is not scanned in the swagger configuration, Here is the solution below:

public Docket createRestApi(){
    return new Docket(DocumentationType.SWAGGER_2).apiInfo(apiInfo())
                .select()
                .apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class))
                .build();
}

apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class))

Indicates that swagger will scan the interface with @API.

Done!

[Solved] SpringBoot Task Error: Unexpected error occurred in scheduled task

Reason:

1. @Scheduled annotation mode level is higher than resource injection level, which leads to resource injection failure

2. There is an error in the code of the scheduled task execution (just check your own code carefully)

Solution:

@Component
public class ScheduleConfig implements ApplicationContextAware {

    private static ApplicationContext context;

    @Override
    public void setApplicationContext(@NotNull ApplicationContext applicationContext) throws BeansException {
        context = applicationContext;
    }

    public static <T> T getBean(Class<T> clazz) {
        return context != null ?context.getBean(clazz) : null;
    }

}

Write a Bean to implement the ApplicationContextAware interface and rewrite the setApplicationContextAware method

It can be called in the scheduled task

[Solved] ssm Error: Error querying database. Cause: org.apache.ibatis.executor.ExecutorException: Executor was closed

Error querying database. Cause: org.apache.ibatis.executor.ExecutorException: Executor was closed.

How to Solve SSM Error:  Error querying database Cause: org.apache.ibatis.executor. ExecutorException: Executor was closed.

Reason for error reporting

The method of querying Dao layer in impl of service layer is written in return, and sqlSession is closed on it

Solution:

Query the data before closing the resource

[Solved] seata:Error creating bean with name ‘globalTransactionScanner‘ defined in class path resource

Error Description:

Cause: my idea uses jdk17 by default. In jdk17, many classes are discarded or deleted. You can switch to jdk8

An error occurred during spring integration of Seata. The error is as follows:


Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2022-08-09 14:03:16.565 ERROR 15912 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'globalTransactionScanner' defined in class path resource [io/seata/spring/boot/autoconfigure/SeataAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [io.seata.spring.annotation.GlobalTransactionScanner]: Factory method 'globalTransactionScanner' threw exception; nested exception is java.lang.ExceptionInInitializerError
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658) ~[spring-beans-5.3.22.jar:5.3.22]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638) ~[spring-beans-5.3.22.jar:5.3.22]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-5.3.22.jar:5.3.22]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195) ~[spring-beans-5.3.22.jar:5.3.22]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.22.jar:5.3.22]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.22.jar:5.3.22]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.22.jar:5.3.22]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.22.jar:5.3.22]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.22.jar:5.3.22]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:213) ~[spring-beans-5.3.22.jar:5.3.22]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.registerBeanPostProcessors(PostProcessorRegistrationDelegate.java:258) ~[spring-context-5.3.22.jar:5.3.22]
	at org.springframework.context.support.AbstractApplicationContext.registerBeanPostProcessors(AbstractApplicationContext.java:762) ~[spring-context-5.3.22.jar:5.3.22]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:567) ~[spring-context-5.3.22.jar:5.3.22]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147) ~[spring-boot-2.7.2.jar:2.7.2]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:734) ~[spring-boot-2.7.2.jar:2.7.2]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408) ~[spring-boot-2.7.2.jar:2.7.2]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:308) ~[spring-boot-2.7.2.jar:2.7.2]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1306) ~[spring-boot-2.7.2.jar:2.7.2]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1295) ~[spring-boot-2.7.2.jar:2.7.2]
	at com.xs.ProtocolApplication.main(ProtocolApplication.java:17) ~[classes/:na]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [io.seata.spring.annotation.GlobalTransactionScanner]: Factory method 'globalTransactionScanner' threw exception; nested exception is java.lang.ExceptionInInitializerError
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.3.22.jar:5.3.22]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ~[spring-beans-5.3.22.jar:5.3.22]
	... 19 common frames omitted
Caused by: java.lang.ExceptionInInitializerError: null
	at net.sf.cglib.core.KeyFactory$Generator.generateClass(KeyFactory.java:166) ~[cglib-3.1.jar:na]
	at net.sf.cglib.core.DefaultGeneratorStrategy.generate(DefaultGeneratorStrategy.java:25) ~[cglib-3.1.jar:na]
	at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:216) ~[cglib-3.1.jar:na]
	at net.sf.cglib.core.KeyFactory$Generator.create(KeyFactory.java:144) ~[cglib-3.1.jar:na]
	at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:116) ~[cglib-3.1.jar:na]
	at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:108) ~[cglib-3.1.jar:na]
	at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:104) ~[cglib-3.1.jar:na]
	at net.sf.cglib.proxy.Enhancer.<clinit>(Enhancer.java:69) ~[cglib-3.1.jar:na]
	at io.seata.config.ConfigurationCache.proxy(ConfigurationCache.java:104) ~[seata-all-1.5.1.jar:1.5.1]
	at io.seata.config.ConfigurationFactory.buildConfiguration(ConfigurationFactory.java:138) ~[seata-all-1.5.1.jar:1.5.1]
	at io.seata.config.ConfigurationFactory.getInstance(ConfigurationFactory.java:94) ~[seata-all-1.5.1.jar:1.5.1]
	at io.seata.spring.annotation.GlobalTransactionScanner.<init>(GlobalTransactionScanner.java:105) ~[seata-all-1.5.1.jar:1.5.1]
	at io.seata.spring.annotation.GlobalTransactionScanner.<init>(GlobalTransactionScanner.java:162) ~[seata-all-1.5.1.jar:1.5.1]
	at io.seata.spring.boot.autoconfigure.SeataAutoConfiguration.globalTransactionScanner(SeataAutoConfiguration.java:83) ~[seata-spring-boot-starter-1.5.1.jar:1.5.1]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.3.22.jar:5.3.22]
	... 20 common frames omitted
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @710f4dc7
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354) ~[na:na]
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297) ~[na:na]
	at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:199) ~[na:na]
	at java.base/java.lang.reflect.Method.setAccessible(Method.java:193) ~[na:na]
	at net.sf.cglib.core.ReflectUtils$2.run(ReflectUtils.java:56) ~[cglib-3.1.jar:na]
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:318) ~[na:na]
	at net.sf.cglib.core.ReflectUtils.<clinit>(ReflectUtils.java:46) ~[cglib-3.1.jar:na]
	... 39 common frames omitted

2022-08-09 14:03:16.566  WARN 15912 --- [       Thread-1] c.a.n.common.http.HttpClientBeanHolder   : [HttpClientBeanHolder] Start destroying common HttpClient
2022-08-09 14:03:16.567  WARN 15912 --- [       Thread-5] c.a.nacos.common.notify.NotifyCenter     : [NotifyCenter] Start destroying Publisher
2022-08-09 14:03:16.567  WARN 15912 --- [       Thread-5] c.a.nacos.common.notify.NotifyCenter     : [NotifyCenter] Destruction of the end
2022-08-09 14:03:16.567  WARN 15912 --- [       Thread-1] c.a.n.common.http.HttpClientBeanHolder   : [HttpClientBeanHolder] Destruction of the end

Solution

Reason: the class globalTransactionScanner cannot be found and cannot be initialized.

Solution: I use JDK 17 in my IDEA. It’s OK to switch to JDK 8.

[Solved] IDEA java compile error: Error:java: Compilation failed: internal java compiler error

There are two possible cases of error: Java: compilation failed: internal java compiler error.

1. The JDK version may be inconsistent

Check whether the following three parts are consistent.

Preferences -> Compiler -> Version setting SDK version in Java compiler

File -> Project Structure -> SDK version in project

File -> Project Structure -> Module -> Module SDK version in each module dependencies

2. The memory setting of the compilation environment may be insufficient.

Preferences -> Compiler -> Shared build process heap size

Increase the default memory of 700M.

[Solved] IDEA jdbc Connect Database Error: java.sql.SQLException: Undefined Error

The following error is reported when using jdbc to connect to a database in IDEA:

Solution:

1. In IDEA, select Run -> Edit Configurations;

2. In the pop-up interface, enter -Duser.name=user in VM option and restart.

****If VM options are not found

* * * * restart operation

File-> Invalidate Caches-> Just restart

[Solved] ERROR: child process failed, exited with error number 100To see additional information in this …

The error below occurs when mongodb is started. Check the log file and find:

exception in initAndListen std::exception: listen: Address already in use, terminating，

 

Possible errors:

1. Your conf file is incorrectly written, format or code, etc

2. Bindip binds both the localhost and the internal and external addresses of the server

Solution: check and write the file format, and pay attention to yaml format. Then, bindip directly accesses 0.0.0.0, allowing all access. It should be OK.

If viewing the log is this error:

Failed to set up listener: SocketException: Address already in use

ps aux | grep mongod
sudo kill -9 {port-number}

TomcatJSON parse error: Invalid UTF-8 [How to Solve]

After deployment on the server, it is found that many places report 400 error, which has a unified feature of transmitting Chinese to the back-end interface

Solution:

1. configure the Tomcat server transmission encoding format specification:

Edit the tomcat/conf/server.xml file and add the encoding attribute: URIEncoding=”UTF-8″ to the Connector tag

2. Edit the tocmat/bin/catalina.bat file and add the following attribute: set JAVA_OPTS=%JAVA_OPTS% -Dfile.encoding=UTF-8

3. the most important step is to restart through shutdown and startup under the bin directory of Tomcat

[Solved] Error–dubbo Connect zk Error: zookeeper not connected

Error Message:

Error creating bean with name 'dubboBootstrapApplicationListener': Initialization of bean failed; nested exception is java.lang.IllegalStateException: zookeeper not connected

 

Problem:
The project starts with the following error.
IllegalStateException: zookeeper not connected

Reason:
First of all, the default connection timeout for dubbo registration is 5 seconds.
And the zookeeper server I connected to was a little slow to access, which caused the connection to time out.

Solution:
Adjust the default registration time for dubbo to 200 seconds
The default registration timeout is 5 seconds
All others are 1 second
So I increased the timeout for other service calls as well.
If you only need to modify the registration timeout, just add or modify registry.

dubbo:
  registry:
    timeout: 200000
  service:
    timeout: 200000
  consumer: 
    timeout: 200000
  provider:
    timeout: 200000

[Solved] Resource compilation failed (Failed to compile values resource file…

Resource compilation failed (Failed to compile values resource file /home/fanbin/AndroidStudioProjects/BookTest/app/build/intermediates/incremental/debug/mergeDebugResources/merged.dir/values/values.xml. ]


Resource registered by this uri is not recognized (Settings | Languages & Frameworks | Schemas and DTDs)

Reason: In color.xml, the color resource does not contain “#”, i.e. #FF000000, which causes this compilation error!

as shown in the figure below, the # number is not added to line 6.

Note: there are other situations that may cause this error. 

[Solved] MySQL Install Error: GPG check FAILED

I just got a Huawei Cloud ECS and chose Centos8 system, today I installed mysql, the version I chose is 5.7.

Import of key(s) didn't help, wrong key(s)?
Public key for mysql-community-client-5.7.39-1.el7.x86_64.rpm is not installed. Failing package is: mysql-community-client-5.7.39-1.el7.x86_64
 GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Public key for mysql-community-common-5.7.39-1.el7.x86_64.rpm is not installed. Failing package is: mysql-community-common-5.7.39-1.el7.x86_64
 GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Public key for mysql-community-libs-5.7.39-1.el7.x86_64.rpm is not installed. Failing package is: mysql-community-libs-5.7.39-1.el7.x86_64
 GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Public key for mysql-community-server-5.7.39-1.el7.x86_64.rpm is not installed. Failing package is: mysql-community-server-5.7.39-1.el7.x86_64
 GPG Keys are configured as: file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
The downloaded packages were saved in cache until the next successful transaction.
You can remove cached packages by executing 'yum clean packages'.
Error: GPG check FAILED

Solution:

Re-import secret key

rpm --import https://repo.mysql.com/RPM-GPG-KEY-mysql-2022

Then execute the installation command

yum -y install mysql-community-server