Tag Archives: back-end

[Solved] SpringBoot Microservices: Failed to configure a DataSource: ‘url‘ attribute is not specified and no embedded dat

Failed to configure the data source: the “url” attribute is not specified, and there is no embedded data source coul

Two methods to solve this error:

The first is to cancel automatic database configuration

@SpringBootApplication(exclude = { DataSourceAutoConfiguration.class })

Unconfigure the SpringBootApplication of the startup class

The second is to configure the database information on the configuration file

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/xxxx
    username: root
    password: root
    driver-class-name: com.mysql.jdbc.Driver

[Solved] EDKII Add Comments or Debug Error: UEFI EDKII error: C2220

Error Messages:

UEFI EDKII error: C2220

Reason: Look at the figure should be coding problems, combined with other languages encountered in the development process of coding problems caused by comment mess, consider this direction to solve.

Solution:

Because the framework of EDKII is different from others, it is not easy to open it with an IDE or set something to modify the encoding format, so we decided to set the decoding method of the window system

Check the Beta version in the control panel and use UTF-8 encoding.

[Solved] Cannot run program “svn” (in directory “D: xxxx”): CreateProcess error=2, the system cannot find the specified file.

 

1. Error content

Cannot run program “svn” (in directory “xxxx”): CreateProcess error=2, the system cannot find the specified file

2. Reason

The command was not installed when TortoiseSVN was installed, so version management cannot be performed through the command

3. Solution

1. Find the TortoiseSVN installation package you downloaded at that time and reinstall it

2. Select the first one here

3. The second option is X, which means that you have not installed the command. Click on and check the first one, and then confirm the next step

[Solved] Error: unable to perform an operation on node ‘[email protected]‘. Please see diagnostics informa

1. Recurrence problem

Today, I logged in to the rabbitmq background management. After inputting the user name and password, this error was reported: not management user, as shown in the following figure:

So I decided to execute the command rabbitmqctl list_users check whether there is this user.

  1. First D:\Software\rabbitmq\rabbitmq_server-3.8.15\sbinenter in the directory cmd:

  1. Execute the following command in the cmdcommand window:
rabbitmqctl list_users

But the following error is reported:

D:\Software\rabbitmq\rabbitmq_server-3.8.15\sbin>rabbitmqctl list_users
Error: unable to perform an operation on node '[email protected]'. Please see diagnostics information and suggestions below.

Most common reasons for this are:

 * Target node is unreachable (e.g. due to hostname resolution, TCP connection or firewall issues)
 * CLI tool fails to authenticate with the server (e.g. due to CLI tool's Erlang cookie not matching that of the server)
 * Target node is not running

In addition to the diagnostics info below:

 * See the CLI, clustering and networking guides on https://rabbitmq.com/documentation.html to learn more
 * Consult server logs on node [email protected]
 * If target node is configured to use long node names, don't forget to use --longnames with CLI tools

DIAGNOSTICS
===========

attempted to contact: ['[email protected]']

[email protected]:
  * connected to epmd (port 4369) on DESKTOP-UVTEHFR
  * epmd reports: node 'rabbit' not running at all
                  no other nodes on DESKTOP-UVTEHFR
  * suggestion: start the node

Current node details:
 * node name: '[email protected]'
 * effective user's home directory: C:\Users\zxy
 * Erlang cookie hash: pkFzX53V7Ok1QDOYqiMzXg==

3. Solving problems

Copy the .erlang.cookie file from the C:\user\your username\ directory to the C:\Windows\System32\config\systemprofile\ directory, as follows:

If the .erlang.cookie file already exists in C:\Windows\System32\config\systemprofile\, just use the .erlang.cookie file in the C:\user\your username\ directory to replace it.

Double-click rabbitmq-server.bat to restart the rabbitmq service, as shown in the following image:


In the cmd command line window, enter rabbitmqctl list_users again:

[Solved] Django Configurate celery error: django.db.utils.DatabaseError

Error on execution of asynchronous task: 

django.db.utils.DatabaseError: DatabaseWrapper objects created in a thread can only be used in that same thread. The object with alias ‘default’ was created in thread id 3047101641304 and this is thread id 3047208084584.

 

Solution:

Original start command (under Windows):
celery -A xxx worker -l info -P eventlet (xxx is the project name)
Modified start command, celery version 4x:
celery -A xxx worker -l info -P solo

[Solved] Error resolving template [x] template might not exist or might not be accessible by any of the con

1. Recurrence problem

Today, after configuring Shiro + jwt , you can start spring boot normally. However, when calling the auth/login login method, the following error is reported:

2022-08-21 12:35:18.205 [ http-nio-8081-exec-1 ] - [ ERROR ] [ org.thymeleaf.TemplateEngine : 1136 ] - [THYMELEAF][http-nio-8081-exec-1] Exception processing template "auth/login": Error resolving template [auth/login], template might not exist or might not be accessible by any of the configured Template Resolvers
org.thymeleaf.exceptions.TemplateInputException: Error resolving template [auth/login], template might not exist or might not be accessible by any of the configured Template Resolvers
	at org.thymeleaf.engine.TemplateManager.resolveTemplate(TemplateManager.java:869)
	at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:607)
	at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098)
	at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072)
	at org.thymeleaf.spring5.view.ThymeleafView.renderFragment(ThymeleafView.java:366)
	at org.thymeleaf.spring5.view.ThymeleafView.render(ThymeleafView.java:190)
	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1396)
	at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1141)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1080)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:652)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
	at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:114)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:112)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)
	at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
	at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
	at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
	at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
	at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:450)
	at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
	at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
	at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
	at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:387)
	at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:204)
	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:183)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
	at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:96)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1707)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)

Why did this error occur?Let me analyze it step by step.

2. Analyze problems

2.1 check pom dependency

I have configured the following dependencies in the .pom file

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

This dependency is to configure the thymeleaf template engine, which we can use to design the template mail sent.

The above error message is sent by this dependency. Let’s see what the thymeleaf the template engine is?

2.2 detailed explanation of thymeleaf engine

thymeleaf Template Engine
thymeleaf is a modern server-side Java templating engine for web and standalone environments.
The main goal of thymeleaf is to bring elegant, natural templates to your development workflow – HTML that displays correctly in the browser and works as a static prototype, allowing for enhanced collaboration in development teams.
With modules for the Spring Framework, extensive integration with your favorite tools and the ability to plug in your own features, thymeleaf is ideal for modern HTML5 JVM web development – although it still has a lot of work to do.
thymeleaf has the following features.
thymeleaf runs with or without a network, so it can be opened directly in a browser to view static page effects. It supports HTML prototypes and can add other attributes inside HTML tags to enable data rendering.
thymeleaf has an out-of-the-box feature. thymeleaf is the recommended template engine for Spring boot and is displayed directly in html, so the front and back ends can be well separated.
It has the following references in spring boot.
internationalization : rendering different countries’ languages
common page display : such as unified exception page handling, common page handling

2.2 check YML configuration

I found that there is no configuration information of thymeleaf in application.yml. The problem may occur here. Therefore, the following configuration is performed in application.yml

spring:
  thymeleaf:
    cache: false 
    prefix: classpath:/templates 
    encoding: UTF-8 
    suffix: .html 
    mode: HTML 

Configuration Description:

  1. The cache line is to turn off the cache of the page, otherwise we may not see the changes in time after changing the page, the default is true.
  2. prefix is to configure the location of the thymeleaf template.
  3. encoding is to configure the encoding of the thymeleaf document.

In many cases, if thymeleaf dependency is introduced, the problem can be solved by configuring the above information in the YML file. If this cannot solve your problem, you can continue to read my analysis

But after I configured the above information in the application.yml file and spring boot is successfully started, calling the /auth/login method still reported the above error, so where does the problem lie?

3. Solve problems

After repeated breakpoint debugging, I found out where the problem was. Originally, it was in my unified exception handling. My source code is written as follows:

/**
 * @author baoya
 * @datetime 2022/8/10 21:50
 * @desc 
 */
@RestControllerAdvice
@Slf4j
public class GlobalExceptionHandler {

    @ExceptionHandler(value = AuthenticationException.class)
    public ReturnResult incorrectCredentialsException(HttpServletRequest request, AuthenticationException e) {
        log.error("Incorrect username or password: {}, request interface: {}", e, request.getRequestURI());
        return ReturnResult.error(USER_CREDENTIALS_ERROR);
    }
}

Restart spring boot and call the /auth/login method and test with postman as follows.

/**
 * @author baoya
 * @datetime 2022/8/10 21:50
 * @desc 
 */
@RestControllerAdvice
@Slf4j
public class GlobalExceptionHandler {

    @ExceptionHandler(value = AuthenticationException.class)
    public ResponseEntity<ReturnResult> incorrectCredentialsException(HttpServletRequest request, AuthenticationException e) {
        log.error("Incorrect username or password: {}, request interface: {}", e, request.getRequestURI());
        return buildResponseEntity(ReturnResult.error(USER_CREDENTIALS_ERROR));
    }

    /**
     * 
     */
    private ResponseEntity<ReturnResult> buildResponseEntity(ReturnResult apiError) {
        return new ResponseEntity<>(apiError, HttpStatus.valueOf(HttpStatus.BAD_REQUEST.value()));
    }
}

Restart the spring boot and call the /auth/login method. Use the postman test, as shown in the following figure:

[Solved] Error creating bean with name ‘mappingJackson2HttpMessageConverter‘ defined in class path resource

1. Recurrence problem

When starting the spring boot project today, the following error occurred:

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'mappingJackson2HttpMessageConverter' defined in class path resource [org/springframework/boot/autoconfigure/http/JacksonHttpMessageConvertersConfiguration$MappingJackson2HttpMessageConverterConfiguration.class]: Unsatisfied dependency expressed through method 'mappingJackson2HttpMessageConverter' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jacksonObjectMapper' defined in class path resource [org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration$JacksonObjectMapperConfiguration.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [com.fasterxml.jackson.databind.ObjectMapper] from ClassLoader [[email protected]]
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:800)
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:541)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1334)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.addCandidateEntry(DefaultListableBeanFactory.java:1605)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1562)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveMultipleBeans(DefaultListableBeanFactory.java:1406)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1338)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory$DependencyObjectProvider.resolveStream(DefaultListableBeanFactory.java:2108)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory$DependencyObjectProvider.orderedStream(DefaultListableBeanFactory.java:2102)
	at org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration.messageConverters(HttpMessageConvertersAutoConfiguration.java:70)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
	... 45 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jacksonObjectMapper' defined in class path resource [org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration$JacksonObjectMapperConfiguration.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [com.fasterxml.jackson.databind.ObjectMapper] from ClassLoader [[email protected]]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:579)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300)
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:887)
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791)
	... 67 common frames omitted
Caused by: java.lang.IllegalStateException: Failed to introspect Class [com.fasterxml.jackson.databind.ObjectMapper] from ClassLoader [[email protected]]
	at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:481)
	at org.springframework.util.ReflectionUtils.doWithLocalMethods(ReflectionUtils.java:321)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.buildLifecycleMetadata(InitDestroyAnnotationBeanPostProcessor.java:232)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.findLifecycleMetadata(InitDestroyAnnotationBeanPostProcessor.java:210)
	at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessMergedBeanDefinition(InitDestroyAnnotationBeanPostProcessor.java:149)
	at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessMergedBeanDefinition(CommonAnnotationBeanPostProcessor.java:294)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyMergedBeanDefinitionPostProcessors(AbstractAutowireCapableBeanFactory.java:1098)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:576)
	... 77 common frames omitted
Caused by: java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/exc/StreamWriteException
	at java.lang.Class.getDeclaredMethods0(Native Method)
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
	at java.lang.Class.getDeclaredMethods(Class.java:1975)
	at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:463)
	... 84 common frames omitted
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.core.exc.StreamWriteException
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 88 common frames omitted

That is the error: Error creating bean with name 'mappingJackson2HttpMessageConverter' defined in class path resource , but no specific error can be seen from this error message.

Therefore, continue to look down the error log and see that the error is reported, as shown in the following figure:

2. Analyze problems

java.lang.ClassNotFoundException: com.fasterxml.jackson.core.exc.StreamWriteException. There are generally three situations when this error occurs:

1. Incompatible version

The version of spring is incompatible with the version of Jackson.

2. caused by Jackson package conflict.

How to view Maven’s package conflicts?

You can use the shortcut key Ctrl+Shift+Alt+U, or open the pom.xml, right-click and select maven, and then select Show Dependencies.

After entering the dependency package structure, you can use the addition and subtraction icon at the top to zoom in and out

The red line is the conflicting package. You can right-click -> Exclude, exclude conflicting packets

Remove the conflicting packets and return to pom.xml to refresh, the conflicting packages are excluded

3. lack of corresponding dependency

I checked my POM file and found that there was no corresponding dependency.

3. Solve problems

Since there is no corresponding dependency, add the following dependency:

<!-- Add jackson.version in properties, which is easily called by dependncy -->
<properties>
    <java.version>1.8</java.version>
    <jackson.version>2.10.1</jackson.version>
</properties>

<!-- jackson -->
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>${jackson.verson}</version>
</dependency>
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-core</artifactId>
  <version>${jackson.verson}</version>
</dependency>
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-annotations</artifactId>
  <version>${jackson.verson}</version>
</dependency>

[Solved] Failed toString() invocation on an object com.alibaba.fastjson.JSONException: write javaBean error

1. Recurrence problem

Today, when starting the spring boot project, the following problems suddenly occurred:

SLF4J: Failed toString() invocation on an object of type [com.superjson.superjsonmanager.config.jwt.JwtProperties$$EnhancerBySpringCGLIB$$3c58badf]
Reported exception:
com.alibaba.fastjson.JSONException: write javaBean error, fastjson version 1.2.70, class org.springframework.beans.factory.support.DefaultListableBeanFactory, fieldName : $$beanFactory, write javaBean error, fastjson version 1.2.70, class com.baomidou.mybatisplus.MybatisConfiguration, fieldName : configuration, write javaBean error, fastjson version 1.2.70, class com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceWrapper, fieldName : dataSource, write javaBean error, fastjson version 1.2.70, class com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl, fieldName : connection, write javaBean error, fastjson version 1.2.70, class com.mysql.cj.jdbc.ConnectionImpl, fieldName : connectionRaw, write javaBean error, fastjson version 1.2.70, class com.mysql.cj.jdbc.DatabaseMetaData, fieldName : metaData, write javaBean error, fastjson version 1.2.70, class com.mysql.cj.jdbc.result.ResultSetImpl, fieldName : catalogs
	at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:539)
	at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:149)
	at com.alibaba.fastjson.serializer.JSONSerializer.writeWithFieldName(JSONSerializer.java:333)
	at com.alibaba.fastjson.serializer.ASMSerializer_1_JwtProperties$$EnhancerBySpringCGLIB$$3c58badf.write(Unknown Source)
	at com.alibaba.fastjson.serializer.JSONSerializer.write(JSONSerializer.java:285)
	at com.alibaba.fastjson.JSON.toJSONString(JSON.java:758)
	at com.alibaba.fastjson.JSON.toJSONString(JSON.java:696)
	at com.alibaba.fastjson.JSON.toJSONString(JSON.java:661)
	at com.superjson.superjsonmanager.config.jwt.JwtProperties.toString(JwtProperties.java:73)
	at org.slf4j.helpers.MessageFormatter.safeObjectAppend(MessageFormatter.java:277)
	at org.slf4j.helpers.MessageFormatter.deeplyAppendParameter(MessageFormatter.java:249)
	at org.slf4j.helpers.MessageFormatter.arrayFormat(MessageFormatter.java:211)
	at org.slf4j.helpers.MessageFormatter.arrayFormat(MessageFormatter.java:161)
	at ch.qos.logback.classic.spi.LoggingEvent.getFormattedMessage(LoggingEvent.java:293)
	at ch.qos.logback.classic.spi.LoggingEvent.prepareForDeferredProcessing(LoggingEvent.java:206)
	at ch.qos.logback.core.OutputStreamAppender.subAppend(OutputStreamAppender.java:223)
	at ch.qos.logback.core.OutputStreamAppender.append(OutputStreamAppender.java:102)
	at ch.qos.logback.core.UnsynchronizedAppenderBase.doAppend(UnsynchronizedAppenderBase.java:84)
	at ch.qos.logback.core.spi.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:51)
	at ch.qos.logback.classic.Logger.appendLoopOnAppenders(Logger.java:270)
	at ch.qos.logback.classic.Logger.callAppenders(Logger.java:257)
	at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:421)
	at ch.qos.logback.classic.Logger.filterAndLog_1(Logger.java:398)
	at ch.qos.logback.classic.Logger.info(Logger.java:583)
	at com.superjson.superjsonmanager.SuperJsonManagerApplication.main(SuperJsonManagerApplication.java:51)
Caused by: com.alibaba.fastjson.JSONException: write javaBean error, fastjson version 1.2.70, class com.baomidou.mybatisplus.MybatisConfiguration, fieldName : configuration, write javaBean error, fastjson version 1.2.70, class com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceWrapper, fieldName : dataSource, write javaBean error, fastjson version 1.2.70, class com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl, fieldName : connection, write javaBean error, fastjson version 1.2.70, class com.mysql.cj.jdbc.ConnectionImpl, fieldName : connectionRaw, write javaBean error, fastjson version 1.2.70, class com.mysql.cj.jdbc.DatabaseMetaData, fieldName : metaData, write javaBean error, fastjson version 1.2.70, class com.mysql.cj.jdbc.result.ResultSetImpl, fieldName : catalogs
	at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:539)
	at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:149)
	at com.alibaba.fastjson.serializer.JSONSerializer.writeWithFieldName(JSONSerializer.java:333)
	at com.alibaba.fastjson.serializer.ASMSerializer_105_DefaultSqlSessionFactory.write(Unknown Source)
	at com.alibaba.fastjson.serializer.MapSerializer.write(MapSerializer.java:271)
	at com.alibaba.fastjson.serializer.MapSerializer.write(MapSerializer.java:44)
	at com.alibaba.fastjson.serializer.FieldSerializer.writeValue(FieldSerializer.java:320)
	at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:470)
	... 24 more

 

2. Analyze problems

I use alibaba.fastjson  to parses the jwtproperties object and reports the above error. This object is used to store the parameters of JWT, as shown in the following code:

/**
 * @author zby
 * @datetime 2022/8/19 12:05
 * @desc jwt entity class, get the configured properties from the yml configuration file
 */
@Getter
@Setter
@Configuration
@ConfigurationProperties(prefix = "jwt")
public class JwtProperties {

    @Value("${jwt.secret}")
    private String appSecret;

    @Value("${jwt.expiration}")
    private long expiration;

    @Value("${jwt.typ}")
    private String typ;

    @Value("${jwt.alg}")
    private String alg;

    @Value("${jwt.subject}")
    private String subject;

    @Value("${jwt.tokenStartWith}")
    private String tokenStartWith;

    @Value("${jwt.tokenHeader}")
    private String tokenHeader;

    public String getTokenStartWith() {
        return tokenStartWith + " ";
    }

    @Override
    @JSONField(serialize = false)
    public String toString() {
        return JSONObject.toJSONString(this);
    }
}

That is, rewrite the tostring() method internal statement JSONObject.toJSONString(this); has a problem, so the breakpoint is to see why this problem occurs, as shown in the screenshot below:

You will find that the dynamically generated the object of jwtproperties does not only have its property value, but also has many more property values that I have not defined. Why does this happen?

It should be that spring boot uses the dynamic proxy mode to instantiate the object, and this additional attribute value is the attribute value of the dynamic proxy object. Therefore, fastjson cannot resolve the attribute value of the dynamic proxy, so an error is reported.

3. Solve problems

Since we know that the error is caused by the spring boot dynamic agent, we do not give the object to the spring boot dynamic agent. We can modify the toString() method as follows:

@Override
@JSONField(serialize = false)
public String toString() {
  JSONObject jsonObject = new JSONObject();
  jsonObject.put("appSecret", this.appSecret);
  jsonObject.put("expiration", this.expiration);
  jsonObject.put("typ", this.typ);
  jsonObject.put("alg", this.alg);
  jsonObject.put("subject", this.subject);
  jsonObject.put("tokenStartWith", this.tokenStartWith);
  jsonObject.put("tokenHeader", this.tokenHeader);
  return JSONObject.toJSONString(jsonObject);
}

Start spring boot as shown in the following figure:

[Solved] Error creating bean with name ‘redisConnectionFactory‘ defined in class path resource…

1. Recurrence problem

When starting the spring boot project today, the following error occurred:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'redisConnectionFactory' defined in class path resource [org/springframework/boot/autoconfigure/data/redis/LettuceConnectionConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory]: Factory method 'redisConnectionFactory' threw exception; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/pool2/impl/GenericObjectPoolConfig
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658)
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1334)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:944)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:438)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:337)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1336)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1325)
	at com.superjson.superjsonmanager.SuperJsonManagerApplication.main(SuperJsonManagerApplication.java:51)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory]: Factory method 'redisConnectionFactory' threw exception; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/pool2/impl/GenericObjectPoolConfig
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
	at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653)
	... 19 common frames omitted
Caused by: java.lang.NoClassDefFoundError: org/apache/commons/pool2/impl/GenericObjectPoolConfig
	at org.springframework.data.redis.connection.lettuce.LettucePoolingClientConfiguration$LettucePoolingClientConfigurationBuilder.<init>(LettucePoolingClientConfiguration.java:94)
	at org.springframework.data.redis.connection.lettuce.LettucePoolingClientConfiguration.builder(LettucePoolingClientConfiguration.java:51)
	at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration$PoolBuilderFactory.createBuilder(LettuceConnectionConfiguration.java:172)
	at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration.createBuilder(LettuceConnectionConfiguration.java:110)
	at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration.getLettuceClientConfiguration(LettuceConnectionConfiguration.java:95)
	at org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration.redisConnectionFactory(LettuceConnectionConfiguration.java:77)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
	... 20 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.apache.commons.pool2.impl.GenericObjectPoolConfig
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 31 common frames omitted

Disconnected from the target VM, address: '127.0.0.1:62013', transport: 'socket'

Process finished with exit code 1

It is error creating bean with name 'redisconnectionfactory' defined in class path resource problem, that is, the redis connection pool cannot be created.

2. Analyze problems

Is there a problem with my redis configuration, or is the redis dependency package not introduced, resulting in the above error?Therefore, the following analysis is made.

1. View redis configuration

spring:
  # Need to set it to always, color print log
  output:
    ansi:
      enabled: always
  redis:
    database: 0
    host: 127.0.0.1
    lettuce:
      pool:
        max-active: 8
        max-idle: 10
        max-wait: 1ms
        min-idle: 5
      shutdown-timeout: 100ms
    port: 6379

There is no problem with the configuration.

2. View redis dependencies

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

Still no problem.

3. Continue to analyze the error log and see that the error is reported, as shown in the following figure:

That is, java.lang.ClassNotFoundException: org.apache.commons.pool2.impl.GenericObjectPoolConfig, the GenericObjectPoolConfig class cannot be found because the dependency of this class is not configured.

3. Solution

Since there are no dependencies related to redis, the following dependencies can be introduced:

<!-- properties add redisCommonsPool.version,so that you can call dependncy easily-->
<properties>
    <java.version>1.8</java.version>
  <redisCommonsPool.version>2.11.1</redisCommonsPool.version>
</properties>

<!-- Introducing the redis connection pool dependency -->
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-pool2</artifactId>
    <version>${redisCommonsPool.version}</version>
</dependency>

Why do I need this dependency? Because I have configured the connection pool of redis in the yml file, and the connection pool needs to use this dependency.

[Solved] ERROR: lib/bridge_generated.dart:837:9: Error: The parameter ‘ptr‘ of the method ‘FlutterRustB

[error reporting]

Launching lib/main.dart on Linux in debug mode...
Finished dev [unoptimized + debuginfo] target(s) in 0.04s
ERROR: lib/bridge_generated.dart:837:9: Error: The parameter 'ptr' of the method 'FlutterRustBridgeExampleWire.store_dart_post_cobject' has type 'int', which does not match the corresponding type, 'Pointer<NativeFunction<Bool Function(Int64, Pointer)>>', in the overridden method, 'FlutterRustBridgeWireBase.store_dart_post_cobject'.
ERROR: - 'Pointer' is from 'dart:ffi'.
ERROR: - 'NativeFunction' is from 'dart:ffi'.
ERROR: - 'Bool' is from 'dart:ffi'.
ERROR: - 'Int64' is from 'dart:ffi'.
ERROR: - 'Void' is from 'dart:ffi'.
ERROR: Change to a supertype of 'Pointer<NativeFunction<Bool Function(Int64, Pointer)>>', or, for a covariant parameter, a subtype.
ERROR: int ptr,
ERROR: ^
ERROR: ../../frb_dart/lib/src/basic.dart:153:8: Context: This is the overridden method ('store_dart_post_cobject').
ERROR: void store_dart_post_cobject(
ERROR: ^
Building Linux application...
Exception: Build process failed

[Solution]

$ export REPO_DIR=$PWD
$ cd /

$ flutter_rust_bridge_codegen \
    --rust-input $REPO_DIR/rust/src/api.rs \
    --dart-output $REPO_DIR/lib/bridge_generated.dart \
    --c-output $REPO_DIR/ios/Classes/bridge_generated.h
[2021-10-22T14:39:33Z INFO  flutter_rust_bridge_codegen] Picked config: Opts { rust_input_path: "/home/consulting/Documents/native_add/rust/src/api.rs", dart_output_path: "/home/consulting/Documents/native_add/lib/bridge_generated.dart", c_output_path: "/home/consulting/Documents/native_add/ios/Classes/bridge_generated.h", rust_crate_dir: "/home/consulting/Documents/native_add/rust", rust_output_path: "/home/consulting/Documents/native_add/rust/src/bridge_generated.rs", class_name: "NativeAdd", dart_format_line_length: 80, skip_add_mod_to_lib: false }
[2021-10-22T14:39:33Z INFO  flutter_rust_bridge_codegen] Phase: Parse source code to AST
[2021-10-22T14:39:33Z INFO  flutter_rust_bridge_codegen] Phase: Parse AST to IR
[2021-10-22T14:39:33Z INFO  flutter_rust_bridge_codegen] Phase: Transform IR
[2021-10-22T14:39:33Z INFO  flutter_rust_bridge_codegen] Phase: Generate Rust code
[2021-10-22T14:39:33Z INFO  flutter_rust_bridge_codegen] Phase: Generate Dart code
[2021-10-22T14:39:33Z INFO  flutter_rust_bridge_codegen] Phase: Other things
[2021-10-22T14:39:34Z INFO  flutter_rust_bridge_codegen] Success! Now go and use it :)

$ cd $REPO_DIR