无法读取候选组件类

无法读取候选组件类

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Eclipse:Tomcat: 无法读取候选组件类:

本文介绍了Eclipse:Tomcat: 无法读取候选组件类:的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

谁能告诉我如何解决这个问题?作为Spring的新生，我搜索并尝试了很多但仍然没有想法.这是我的 Java 构建路径.

Can someone tell me how to solve this issue? As a freshman in Spring, I searched and tried a lot but still no ideas. This is my Java build path.

这是我的 pom.xml 文件

This is my pom.xml file

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
      <groupId>net.codejava.contact</groupId>
      <artifactId>ContactManager</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <packaging>war</packaging>
      <build>
        <sourceDirectory>src</sourceDirectory>
        <plugins>
          <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.8.1</version>
            <configuration>
              <release>13</release>
            </configuration>
          </plugin>
          <plugin>
            <artifactId>maven-war-plugin</artifactId>
            <version>3.2.3</version>
            <configuration>
              <warSourceDirectory>WebContent</warSourceDirectory>
            </configuration>
          </plugin>
        </plugins>
      </build>


      <properties>
          <spring.version>5.1.9.RELEASE</spring.version>
    </properties>


        <dependencies>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>${spring.version}</version>
            </dependency>

                <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${spring.version}</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>

     <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>javax.servlet.jsp-api</artifactId>
            <version>2.3.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
    </dependency>


        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>
    </dependencies>
</project>

Tomcat 错误堆栈如下

The Tomcat error stack is as follow

Context initialization failed
org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: file [C:\Users\Jaden\eclipse-workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\ContactManager\WEB-INF\classes\net\codejava\contact\config\SpringMvcConfig.class]; nested exception is org.springframework.core.NestedIOException: ASM ClassReader failed to parse class file - probably due to a new Java class file version that isn't supported yet: file [C:\Users\Jaden\eclipse-workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\ContactManager\WEB-INF\classes\net\codejava\contact\config\SpringMvcConfig.class]; nested exception is java.lang.IllegalArgumentException: Unsupported class file major version 57
    at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.scanCandidateComponents(ClassPathScanningCandidateComponentProvider.java:454)
    at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents(ClassPathScanningCandidateComponentProvider.java:316)
    at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:275)
    at org.springframework.context.annotation.ComponentScanAnnotationParser.parse(ComponentScanAnnotationParser.java:132)
    at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:287)
    at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:242)
    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:199)
    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:167)
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:315)
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:232)
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:275)
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:95)
    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:705)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:531)
    at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:701)
    at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:577)
    at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:529)
    at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:169)
    at javax.servlet.GenericServlet.init(GenericServlet.java:158)
    at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1134)
    at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:986)
    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4902)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5211)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
    at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909)
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:843)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1384)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1374)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
    at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:909)
    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:434)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:772)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:567)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:342)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:473)
Caused by: org.springframework.core.NestedIOException: ASM ClassReader failed to parse class file - probably due to a new Java class file version that isn't supported yet: file [C:\Users\Jaden\eclipse-workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\ContactManager\WEB-INF\classes\net\codejava\contact\config\SpringMvcConfig.class]; nested exception is java.lang.IllegalArgumentException: Unsupported class file major version 57
    at org.springframework.core.type.classreading.SimpleMetadataReader.<init>(SimpleMetadataReader.java:57)
    at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:103)
    at org.springframework.core.type.classreading.CachingMetadataReaderFactory.getMetadataReader(CachingMetadataReaderFactory.java:123)
    at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.scanCandidateComponents(ClassPathScanningCandidateComponentProvider.java:430)
    ... 50 more
Caused by: java.lang.IllegalArgumentException: Unsupported class file major version 57
    at org.springframework.asm.ClassReader.<init>(ClassReader.java:184)
    at org.springframework.asm.ClassReader.<init>(ClassReader.java:166)
    at org.springframework.asm.ClassReader.<init>(ClassReader.java:152)
    at org.springframework.asm.ClassReader.<init>(ClassReader.java:273)
    at org.springframework.core.type.classreading.SimpleMetadataReader.<init>(SimpleMetadataReader.java:54)
    ... 53 more

我不明白这个错误有什么问题，但我真的需要修复它并继续下一步.

I can't understand what is wrong with this bug, but I really need to fix it and continue the next step.

推荐答案

ASM ClassReader 无法解析类文件 - 可能是由于尚不支持新的 Java 类文件版本":你的问题属于这个问题的范畴，但我相信它与它略有不同.

"ASM ClassReader failed to parse class file - probably due to a new Java class file version that isn't supported yet": your problem falls into the category of this question, but I believe it slightly differs from it.

Spring 附带了重新打包的 ASM 版本，在 5.1.x 系列中，该版本仅支持最多 12 个 Java.切换到 5.2.x 系列以支持 Java 13.

Spring comes with a repackaged version of ASM, that in the 5.1.x series supports only Java up to 12. Switch to the 5.2.x series for Java 13 support.

由于您的项目是新项目(没有兼容性问题)，我将使用最新发布的 Spring 版本(撰写本文时为 5.3.4).

Since your project is new (no compatibility issues) I would use the newest Spring version released (5.3.4 at the time of writing).

编辑:Spring 重新打包的 ASM 支持的 Java 版本的小总结:

Edit: A small summary of the Java versions supported by Spring's repackaged ASM:

  • Spring 5.0.x:版本检查已注释掉(参见 源代码),
  • Spring 5.1.x:最高可达 Java 12，
  • Spring 5.2.x:最高可达 Java 15，
  • Spring 5.3.x:适用于 Java 18.

这篇关于Eclipse:Tomcat: 无法读取候选组件类:的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

08-07 00:53
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