Category Archives: JAVA

[Solved] Error occurred during initialization of VM javalangNoClassDefFoundError javalangObject

When you run java/javac/java -version under the doc command, an error was reported:

Error occurred during initialization of VM java/lang/NoClassDefFoundError: java/lang/Object

 

Or eclipse cannot be opened for this reason

I summarized the following three reasons:

1: java environment variables are misconfigured, check the right and wrong environment variables, especially check the classpath

General (in the case of java configuration only), the value of the environment variable

JAVA_HOME ========= “your jdk installation directory” such as “C:Program FilesJavajdk1.8.0_121”

Path ========= “%JAVA_HOME%in;%JAVA_HOME%jrein”

CLASS_PATH ========= “%JAVA_HOME%libdt.jar;%JAVA_HOME%lib ools.jar”

2: If there is no problem with the environment variable configuration, then go to the jdk installation directory (such as C:Program FilesJavajdk1.8.0_121) and look for tools.jar under lib and rt.jar under jrelib to see if they exist, it is possible that rt.pack and tools.pack exist.

At this point, just unpack the corresponding files into rt.jar and tools.jar, and you can use the unpack200 tool inside the bin

#cd /usr/java/j2sdk1.4.2/lib
#unpack tools.pack tools.jar
#cd …/jre/lib
#…/…/unpack rt.pack rt.jar

3: There is no tools.jar under lib or rt.jar under jrelib, or there are missing files under lib or jrelib (40 files), so just copy them from elsewhere.

If you run java command after copying tools.jar or rt.jar, there may be missing files under jrelib, look carefully or just copy a whole jrelib, it can be solved.

[Solved] java Internal error in the mapping processor java.lang.NullPointerException

Error:

java: Internal error in the mapping processor: java.lang.NullPointerException  	
at org.mapstruct.ap.internal.processor.DefaultVersionInformation.createManifestUrl(DefaultVersionInformation.java:182)  	
at org.mapstruct.ap.internal.processor.DefaultVersionInformation.openManifest(DefaultVersionInformation.java:153)  	
at org.mapstruct.ap.internal.processor.DefaultVersionInformation.getLibraryName(DefaultVersionInformation.java:129)  	
at org.mapstruct.ap.internal.processor.DefaultVersionInformation.getCompiler(DefaultVersionInformation.java:122)  	
at org.mapstruct.ap.internal.processor.DefaultVersionInformation.fromProcessingEnvironment(DefaultVersionInformation.java:95)  	
at org.mapstruct.ap.internal.processor.DefaultModelElementProcessorContext.<init>(DefaultModelElementProcessorContext.java:50)  
at org.mapstruct.ap.MappingProcessor.processMapperElements(MappingProcessor.java:218)  	
at org.mapstruct.ap.MappingProcessor.process(MappingProcessor.java:156)  	
at org.jetbrains.jps.javac.APIWrappers$ProcessorWrapper.process(APIWrappers.java:109)  	
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  	
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)  	
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)  	
at java.lang.reflect.Method.invoke(Method.java:498)  	
at org.jetbrains.jps.javac.APIWrappers$1.invoke(APIWrappers.java:213)  	
at org.mapstruct.ap.MappingProcessor.process(Unknown Source)  	
at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:794)  	
at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:705)  
at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1800(JavacProcessingEnvironment.java:91)  	
at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1035)  	
at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1176)  	
at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170)  	
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:856)  	
at com.sun.tools.javac.main.Main.compile(Main.java:523)  	
at com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:129)  	
at com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:138)  	
at org.jetbrains.jps.javac.JavacMain.compile(JavacMain.java:231)  	
at org.jetbrains.jps.incremental.java.JavaBuilder.compileJava(JavaBuilder.java:501)  	
at org.jetbrains.jps.incremental.java.JavaBuilder.compile(JavaBuilder.java:353)  	
at org.jetbrains.jps.incremental.java.JavaBuilder.doBuild(JavaBuilder.java:277)  	
at org.jetbrains.jps.incremental.java.JavaBuilder.build(JavaBuilder.java:231)  	
at org.jetbrains.jps.incremental.IncProjectBuilder.runModuleLevelBuilders(IncProjectBuilder.java:1441)  	
at org.jetbrains.jps.incremental.IncProjectBuilder.runBuildersForChunk(IncProjectBuilder.java:1100)  	at org.jetbrains.jps.incremental.IncProjectBuilder.buildTargetsChunk(IncProjectBuilder.java:1224)  	at org.jetbrains.jps.incremental.IncProjectBuilder.buildChunkIfAffected(IncProjectBuilder.java:1066)  	at org.jetbrains.jps.incremental.IncProjectBuilder.buildChunks(IncProjectBuilder.java:832)  	at org.jetbrains.jps.incremental.IncProjectBuilder.runBuild(IncProjectBuilder.java:419)  	at org.jetbrains.jps.incremental.IncProjectBuilder.build(IncProjectBuilder.java:183)  	at org.jetbrains.jps.cmdline.BuildRunner.runBuild(BuildRunner.java:132)  	at org.jetbrains.jps.cmdline.BuildSession.runBuild(BuildSession.java:302)  	at org.jetbrains.jps.cmdline.BuildSession.run(BuildSession.java:132)  	at org.jetbrains.jps.cmdline.BuildMain$MyMessageHandler.lambda$channelRead0$0(BuildMain.java:219)  	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)  	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)  	at java.lang.Thread.run(Thread.java:748)

When using MapStruct, idea version 2020.3, an error occurs when building the project: java: Internal error in the mapping processor: java.lang.NullPointerException

Solution:
Setting –>Build,Execution,Deployment –>Compiler –>User-local build add the parameter
-Djps.track.ap.dependencies=false

[Solved] docker Error response from daemon driver failed programming external connectivity on endpoint lamp

Docker containers do port mapping error:

docker: Error response from daemon: driver failed programming external connectivity on endpoint lamp3 (46b7917c940f7358948e55ec2df69a4dec2c6c7071b002bd374e8dbf0d40022c): (iptables failed: iptables --wait -t nat -A DOCKER -p tcp -d 0/0 --dport 86 -j DNAT --to-destination 172.17.0.2:80 ! -i docker0: iptables: No chain/target/match by that name.

 

Solution:

The custom chain DOCKER defined at the start of the docker service is cleared

Restart and it will be OK! systemctl restart docker

How to Solve Mockito mockedStatic NotAMockException Error

Error Message:

org.mockito.exceptions.misusing.NotAMockException: Argument passed to Mockito.mockingDetails() should be a mock, but is an instance of class java.lang.Class!
    at org.mockito.internal.runners.StrictRunner.run(StrictRunner.java:52)
    at org.mockito.junit.MockitoJUnitRunner.run(MockitoJUnitRunner.java:163)
    at org.mockito.runners.MockitoJUnitRunner.run(MockitoJUnitRunner.java:53)

 

Solution:
Delete @RunWith(MockitoJUnitRunner.class)
and add

    @Before
    public void before(){
        log.info("start--------{}",this.getClass().getName());
         MockitoAnnotations.openMocks(this);
    }

mybatis-plus Common Error and Their Solution

2021/7/9

Error 1: there is no @EnumValue annotation when writing enumeration class

Solution 1: @EnumValueis an annotation supported after mybatis-plus version 3.0

 

Error 2:

java.lang.annotation.AnnotationFormatError: Invalid default: public abstract java.lang.Class org.mybatis.spring.annotation.MapperScan.factoryBean()

Solution 2:

Modify the dependency from

<dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus</artifactId>
            <version>3.3.2</version>
        </dependency>

to

 <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.0.5</version>
        </dependency>

 

Error 3:
java.lang.IllegalStateException: Failed to load ApplicationContext
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘***’: Unsatisfied dependency

Solution 3:

Delete the dependency of mybaits

 <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>

 

Error 4:

The list() method reports red, indicating that the parameter is missing,

Solution 4:

View source code

Method does require parameters

View official documents

It may be due to the version problem. In the latest version, you do not need to pass the parameter. The parameter should be null

Problem-solving

 

Error 5:

java.lang.IllegalArgumentException: No enum constant com.book.bookshop.entity.enums.Suit.1

Solution 5:

Removing spring-boot-devtools, this plug-in will cause many problems. It is estimated that it should be the main reason

How to Solve EasyExcel3.0.5 Version Error

Because the SpringBoot version is incompatible with the cglib version of EasyExcel;

Phenomenon:

# error 1
Caused by: java.lang.IllegalArgumentException
 at org.objectweb.asm.ClassVisitor.<init>(Unknown Source)
 # Error 2
com.alibaba.excel.exception.ExcelAnalysisException: java.lang.ExceptionInInitializerError
 at com.alibaba.excel.analysis.ExcelAnalyserImpl.analysis(ExcelAnalyserImpl.java:134)

Because the cglib package on which asm depends is inconsistent with the springboot version, an error is reported

Solution:

For example, easyexcel version is 3.0.5, and cglib needs to be configured to 3.3.0 

<dependency>
	<groupId>cglib</groupId>
	<artifactId>cglib</artifactId>
	<version>3.3.0</version>
</dependency>

How to Solve zipkin Install Error in Windows

Error:

org.springframework.beans.factory.BeanCreationException: Error creating com.linecorp.armeria.spring.ArmeriaAutoConfiguration via factory method: Bean named ' armeriaServer ' defined in bean instantiation failed; nested exception is org.springframework.beans. BeanInstantiationException: Unable to instantiate com.linecorp.armeria.server.Server: Factory method 'armeriaServer' threw exception; nested exception is java.util.concurrent.CompletionException: java.lang.IllegalStateException: Armeria server failed to start

java.lang.IllegalStateException: Armeria server failed to start

 

Solution:

Close CMD window first

Open Task Manager

Find the detail-information and kill all java.exe. then restart cmd to upzip to install.

Problem-solving

[Solved] SpringBoot+Dubbo Startup Error: Fail to start server(url dubbo192.168.0.920880service

When using springboot + Dubbo, the startup project reports an error

All error information is as follows:

org.apache.dubbo.rpc.RpcException: Fail to start server(url: dubbo://192.168.0.9:20880/service.UserInfoService?anyhost=true&application=user-login-service&bind.ip=192.168.0.9&bind.port=20880&channel.readonly.sent=true&codec=dubbo&deprecated=false&dubbo=2.0.2&dynamic=true&generic=false&heartbeat=60000&interface=service.UserInfoService&metadata-type=remote&methods=selectUesers,deleteUser,registerUser,updateUser,selectUser,findAllUsers&pid=83072&qos.accept.foreign.ip=false&qos.enable=false&release=2.7.8&side=provider&timestamp=1641785798014) Failed to bind NettyServer on /192.168.0.9:20880, cause: Address already in use: bind
	at org.apache.dubbo.rpc.protocol.dubbo.DubboProtocol.createServer(DubboProtocol.java:348) ~[dubbo-2.7.8.jar:2.7.8]
	at org.apache.dubbo.rpc.protocol.dubbo.DubboProtocol.openServer(DubboProtocol.java:320) ~[dubbo-2.7.8.jar:2.7.8]
	at org.apache.dubbo.rpc.protocol.dubbo.DubboProtocol.export(DubboProtocol.java:303) ~[dubbo-2.7.8.jar:2.7.8]
	at org.apache.dubbo.rpc.protocol.ProtocolListenerWrapper.export(ProtocolListenerWrapper.java:64) ~[dubbo-rpc-api-2.7.8.jar:2.7.8]
	at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper.export(ProtocolFilterWrapper.java:155) ~[dubbo-rpc-api-2.7.8.jar:2.7.8]
	at org.apache.dubbo.qos.protocol.QosProtocolWrapper.export(QosProtocolWrapper.java:66) ~[dubbo-2.7.8.jar:2.7.8]
	at org.apache.dubbo.rpc.Protocol$Adaptive.export(Protocol$Adaptive.java) ~[dubbo-common-2.7.8.jar:2.7.8]
	at org.apache.dubbo.registry.integration.RegistryProtocol.lambda$doLocalExport$2(RegistryProtocol.java:255) ~[dubbo-registry-api-2.7.8.jar:2.7.8]
	at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660) ~[na:1.8.0_302]
	at org.apache.dubbo.registry.integration.RegistryProtocol.doLocalExport(RegistryProtocol.java:253) ~[dubbo-registry-api-2.7.8.jar:2.7.8]
	at org.apache.dubbo.registry.integration.RegistryProtocol.export(RegistryProtocol.java:205) ~[dubbo-registry-api-2.7.8.jar:2.7.8]
	at org.apache.dubbo.rpc.protocol.ProtocolListenerWrapper.export(ProtocolListenerWrapper.java:62) ~[dubbo-rpc-api-2.7.8.jar:2.7.8]
	at org.apache.dubbo.rpc.protocol.ProtocolFilterWrapper.export(ProtocolFilterWrapper.java:153) ~[dubbo-rpc-api-2.7.8.jar:2.7.8]
	at org.apache.dubbo.qos.protocol.QosProtocolWrapper.export(QosProtocolWrapper.java:64) ~[dubbo-2.7.8.jar:2.7.8]
	at org.apache.dubbo.rpc.Protocol$Adaptive.export(Protocol$Adaptive.java) ~[dubbo-common-2.7.8.jar:2.7.8]
	at org.apache.dubbo.config.ServiceConfig.doExportUrlsFor1Protocol(ServiceConfig.java:492) ~[dubbo-2.7.8.jar:2.7.8]
	at org.apache.dubbo.config.ServiceConfig.doExportUrls(ServiceConfig.java:325) ~[dubbo-2.7.8.jar:2.7.8]
	at org.apache.dubbo.config.ServiceConfig.doExport(ServiceConfig.java:300) ~[dubbo-2.7.8.jar:2.7.8]
	at org.apache.dubbo.config.ServiceConfig.export(ServiceConfig.java:206) ~[dubbo-2.7.8.jar:2.7.8]
	at org.apache.dubbo.config.bootstrap.DubboBootstrap.lambda$exportServices$15(DubboBootstrap.java:1103) ~[dubbo-2.7.8.jar:2.7.8]
	at java.util.HashMap$Values.forEach(HashMap.java:981) ~[na:1.8.0_302]
	at org.apache.dubbo.config.bootstrap.DubboBootstrap.exportServices(DubboBootstrap.java:1090) ~[dubbo-2.7.8.jar:2.7.8]
	at org.apache.dubbo.config.bootstrap.DubboBootstrap.start(DubboBootstrap.java:901) ~[dubbo-2.7.8.jar:2.7.8]
	at org.apache.dubbo.config.spring.context.DubboBootstrapApplicationListener.onContextRefreshedEvent(DubboBootstrapApplicationListener.java:59) ~[dubbo-2.7.8.jar:2.7.8]
	at org.apache.dubbo.config.spring.context.DubboBootstrapApplicationListener.onApplicationContextEvent(DubboBootstrapApplicationListener.java:52) ~[dubbo-2.7.8.jar:2.7.8]
	at org.apache.dubbo.config.spring.context.OneTimeExecutionApplicationContextEventListener.onApplicationEvent(OneTimeExecutionApplicationContextEventListener.java:40) ~[dubbo-2.7.8.jar:2.7.8]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:176) ~[spring-context-5.3.14.jar:5.3.14]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:169) ~[spring-context-5.3.14.jar:5.3.14]
	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:143) ~[spring-context-5.3.14.jar:5.3.14]
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:421) ~[spring-context-5.3.14.jar:5.3.14]
	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:378) ~[spring-context-5.3.14.jar:5.3.14]
	at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:938) ~[spring-context-5.3.14.jar:5.3.14]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:586) ~[spring-context-5.3.14.jar:5.3.14]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.6.2.jar:2.6.2]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:730) [spring-boot-2.6.2.jar:2.6.2]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:412) [spring-boot-2.6.2.jar:2.6.2]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:302) [spring-boot-2.6.2.jar:2.6.2]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1301) [spring-boot-2.6.2.jar:2.6.2]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1290) [spring-boot-2.6.2.jar:2.6.2]
	at com.clc.userlogin7000.demo.UserLoginApplication.main(UserLoginApplication.java:12) [classes/:na]
Caused by: org.apache.dubbo.remoting.RemotingException: Failed to bind NettyServer on /192.168.0.9:20880, cause: Address already in use: bind
	at org.apache.dubbo.remoting.transport.AbstractServer.<init>(AbstractServer.java:77) ~[dubbo-remoting-api-2.7.8.jar:2.7.8]
	at org.apache.dubbo.remoting.transport.netty4.NettyServer.<init>(NettyServer.java:77) ~[dubbo-2.7.8.jar:2.7.8]
	at org.apache.dubbo.remoting.transport.netty4.NettyTransporter.bind(NettyTransporter.java:35) ~[dubbo-2.7.8.jar:2.7.8]
	at org.apache.dubbo.remoting.Transporter$Adaptive.bind(Transporter$Adaptive.java) ~[dubbo-common-2.7.8.jar:2.7.8]
	at org.apache.dubbo.remoting.Transporters.bind(Transporters.java:56) ~[dubbo-remoting-api-2.7.8.jar:2.7.8]
	at org.apache.dubbo.remoting.exchange.support.header.HeaderExchanger.bind(HeaderExchanger.java:44) ~[dubbo-remoting-api-2.7.8.jar:2.7.8]
	at org.apache.dubbo.remoting.exchange.Exchangers.bind(Exchangers.java:70) ~[dubbo-remoting-api-2.7.8.jar:2.7.8]
	at org.apache.dubbo.rpc.protocol.dubbo.DubboProtocol.createServer(DubboProtocol.java:346) ~[dubbo-2.7.8.jar:2.7.8]
	... 39 common frames omitted
Caused by: java.net.BindException: Address already in use: bind
	at sun.nio.ch.Net.bind0(Native Method) ~[na:1.8.0_302]
	at sun.nio.ch.Net.bind(Net.java:463) ~[na:1.8.0_302]
	at sun.nio.ch.Net.bind(Net.java:455) ~[na:1.8.0_302]
	at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:233) ~[na:1.8.0_302]
	at io.netty.channel.socket.nio.NioServerSocketChannel.doBind(NioServerSocketChannel.java:134) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
	at io.netty.channel.AbstractChannel$AbstractUnsafe.bind(AbstractChannel.java:562) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
	at io.netty.channel.DefaultChannelPipeline$HeadContext.bind(DefaultChannelPipeline.java:1334) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeBind(AbstractChannelHandlerContext.java:506) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
	at io.netty.channel.AbstractChannelHandlerContext.bind(AbstractChannelHandlerContext.java:491) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
	at io.netty.channel.DefaultChannelPipeline.bind(DefaultChannelPipeline.java:973) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
	at io.netty.channel.AbstractChannel.bind(AbstractChannel.java:260) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
	at io.netty.bootstrap.AbstractBootstrap$2.run(AbstractBootstrap.java:356) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164) ~[netty-common-4.1.72.Final.jar:4.1.72.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469) ~[netty-common-4.1.72.Final.jar:4.1.72.Final]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503) ~[netty-transport-4.1.72.Final.jar:4.1.72.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986) ~[netty-common-4.1.72.Final.jar:4.1.72.Final]
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.72.Final.jar:4.1.72.Final]
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.72.Final.jar:4.1.72.Final]
	at java.lang.Thread.run(Thread.java:853) ~[na:1.8.0_302]

Solution:

application.yaml or application.properties configuration file port from 20880 to 20881 can be modified because I have configured 20880 in other modules, so here again configuration will report a duplicate binding exception ~ ~

[Solved] nacos Startup Error: Unable to start embedded Tomcat

Project scenario:

Nacos is prepared to be used as the configuration center. Version 1.3.1 (official recommended stable version – January 11, 2021)
MySQL version: version 5.7 (I heard that version 5.8 has changed greatly), otherwise nacos-mysql.sql file cannot be run
JDK version: 1.8.0_144 (the lower version not works)

Problem Description:

1. Run the spring cloud Alibaba Nacos source code in the local idea, and an error is reported: unable to start embedded Tomcat

org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:157)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:540)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
	at com.alibaba.nacos.Nacos.main(Nacos.java:35)
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
	at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:125)
	at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:86)
	at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:414)
	at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:174)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:181)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:154)
	... 8 common frames omitted

Cause analysis:

Modified in the application.properties configuration file as below:

#*************** Config Module Related Configurations ***************#
### If use MySQL as datasource:
spring.datasource.platform=mysql

### Count of DB:
db.num=1

### Connect URL of DB:
db.url.0=jdbc:mysql://127.0.0.1:3306/nacos?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true&useUnicode=true&useSSL=false&serverTimezone=UTC
db.user=root
db.password=root

Solution:

The solution of idea
The source code was downloaded locally and imported into idea, no error was reported or anything (although the import will prompt that various classes cannot be found or something) The startup class is in the console module, you need to modify the application.properties of this module, the modification method is the same as the modification method of the configuration file of nacos server, Nacos local source code build Start, if not a cluster start, you need to add -Dnacos.standalone=true in the start parameters.
1. Click Edit Configurations in the upper right corner

2. In the pop-up interface, enter -Dnacos.standalone=true in VM options, save it

[Solved] Docker Elasticsearch8.4.0 Error: Exception in thread “main” java.nio.file.FileSystemException 

Exception in thread "main" java.nio.file.FileSystemException: /usr/share/elasticsearch/config/elasticsearch.yml.Dym72YkCRZ-GMAliqWE2IA.tmp -> /usr/share/elasticsearch/config/elasticsearch.yml: Device or resource busy
	at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:100)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:106)
	at java.base/sun.nio.fs.UnixCopyFile.move(UnixCopyFile.java:416)
	at java.base/sun.nio.fs.UnixFileSystemProvider.move(UnixFileSystemProvider.java:266)
	at java.base/java.nio.file.Files.move(Files.java:1432)
	at org.elasticsearch.xpack.security.cli.AutoConfigureNode.fullyWriteFile(AutoConfigureNode.java:1127)
	at org.elasticsearch.xpack.security.cli.AutoConfigureNode.fullyWriteFile(AutoConfigureNode.java:1139)
	at org.elasticsearch.xpack.security.cli.AutoConfigureNode.execute(AutoConfigureNode.java:687)
	at org.elasticsearch.server.cli.ServerCli.autoConfigureSecurity(ServerCli.java:161)
	at org.elasticsearch.server.cli.ServerCli.execute(ServerCli.java:85)
	at org.elasticsearch.common.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:54)
	at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:85)
	at org.elasticsearch.cli.Command.main(Command.java:50)
	at org.elasticsearch.launcher.CliToolLauncher.main(CliToolLauncher.java:64)

Cause: it is estimated that there is a problem with the mounting of the configuration file

My solution: when docker starts, it can run successfully without mounting the configuration file

1. The address bar cannot access port 9200

It needs to be added in elasticsearch.yml in the container

http.host: 0.0.0.0

2. After the above method is configured, you need to input the account password to access the 9200 port

After finding some solutions, you need to configure the following contents in the configuration file in the container

xpack.secruity.enabled: false

After restarting the container, ES can be run successfully

Note: VIM needs to be installed before editing the files in the container

[Solved] Tomcat startup error: sub-container startup failed

Tomcat Startup Error:

When reviewing Java Web, I want to make my workspace cleaner, so I cleaned up the web projects left in the Tomcat installation directory webapps, and double-click start Bat file, the CMD window flashes by, and I feel strange at once. This situation is usually JAVA_Home environment variable is not configured correctly.

Then open start.bat in text mode, add “pause” after the end statement at the end, and double-click start.bat again after saving, the following results appear:

It is found that the paths are correct, indicating that there is no problem with my environment variable configuration.

Open start.bat again as text, call call "%EXECUTABLE%" start %CMD_LINE_ARGS% statement is changed to run. After saving, double-click start.bat, the following message appears:

A series of errors are shown later, and I only cut one illustratively.

The main information observed is that the sub-container failed to start, and a specified resource set is invalid. The service component necessary Catalina.start fails to start; When you look carefully, you find that it shows an invalid resource set path (at the end of the figure above). You can see that there is no relevant folder under this path.

So I looked at the server.xml file in the conf directory and saw the following configuration (only the code was intercepted):

<Service name="Catalina">
    <Engine defaultHost="localhost" name="Catalina">
        <Host appBase="webapps" autoDeploy="true" name="localhost" unpackWARs="true">
            <Context docBase="E:apache-tomcat-9.0.20webappsSSM" path="/SSM" reloadable="true" source="org.eclipse.jst.jee.server:SSM"/>
            <Context docBase="E:apache-tomcat-9.0.20webappsSpring" path="/Spring" reloadable="true" source="org.eclipse.jst.jee.server:Spring"/>
            <Context docBase="E:apache-tomcat-9.0.20webappsPressRelease" path="/PressRelease" reloadable="true" source="org.eclipse.jst.jee.server:PressRelease"/>
        </Host>
    </Engine>
</Service>

In the Context tag, docBase specifies the path of the project, which is accessed through the virtual path path. Because I deleted these three folders together when cleaning the project before, there was an error when Tomcat started.

Delete the contents of the three Context tags in the server.xml file, double-click start.bat after saving, and find that Tomcat has started normally and can access port 8080;

Or create the corresponding SSM, Spring, and PressRelease folders in the webapps directory, and Tomcat can also be started normally.

[Solved] Jar error on Linux: no main manifest attribute

1: Running jar package in Linux environment, unable to find main

Reason: pom is missing configuration

Add the following to the pom file

<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>