Java 此错误是什么意思？不支持的类文件主版本56以及如何修复它？

（编辑注：这是objectweb，而不是JVM。在下意识关闭之前，一定要确保重复）

---

当我尝试运行测试时，我正在恢复一个处于中断状态的项目，但我得到了以下错误：

Execution default-test of goal org.apache.maven.plugins:maven-surefire-plugin:2.22.0:test failed: Unsupported class file major version 56 

这是什么意思？有没有办法解决这个问题

Maven项目包括：

    <pluginManagement>
        <plugins>
            <plugin> 
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.22.0</version>
            </plugin>
        </plugins>
    </pluginManagement>

因此，我猜该版本也不受支持。

您使用的是Java 12（并为其编译代码，以便生成的类文件仅对Java 12及更高版本有效）

您在封面下使用的Objectweb版本不支持读取Java12类文件（这是版本56对应的）

简单的修复方法是根据您需要使用的Objectweb版本，将构建重新配置为针对Java11或更早版本进行编译。一些实验可能是必要的

---

如果问题已经解决，也可以更新到objectweb的最新版本，但这可能会破坏堆栈的其他部分，因此，如果这样做，一定要升级所有内容

用旧的java编译。@Thorbjørnravandersen:对不起，你是什么意思？我应该用旧的Java编译吗？这是为什么？@pupeno您使用的是Java 12，它创建的类文件对于maven构建链中的某些使用过的工具来说太新了。安装Java 11（这是LTS版本）或尝试将编译器插件配置为使用

11

和

11

。您已经使用Java-12编译了代码，同时尝试使用低于该版本的版本执行它。请参阅以了解更多详细信息。另一方面，请尝试将surefire插件升级到

org.apache.maven.plugins maven surefire插件3.0.0-M3

@naman请注意，这是objectweb，而不是JVM。在阅读您的答案之前，我甚至不知道objectweb是什么。我试图弄清楚它是如何被使用的。如果我没记错的话，它是用于字节码操作/检查的。

> mvn test -e
[INFO] Error stacktraces are turned on.
[INFO] Scanning for projects...
[INFO]
[INFO] --------------------< com.example:projectxserver >--------------------
[INFO] Building projectxserver 1.0.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[WARNING] The artifact org.hibernate:hibernate-validator:jar:6.0.17.Final has been relocated to org.hibernate.validator:hibernate-validator:jar:6.0.17.Final
[INFO]
[INFO] --- maven-resources-plugin:3.1.0:resources (default-resources) @ projectxserver ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] Copying 15 resources
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) @ projectxserver ---
[WARNING] ***********************************************************************************************************************************************************************
[WARNING] * Required filename-based automodules detected: [javax.servlet-api-4.0.1.jar, javax.inject-1.jar]. Please don't publish this project to a public artifact repository! *
[WARNING] ***********************************************************************************************************************************************************************
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-resources-plugin:3.1.0:testResources (default-testResources) @ projectxserver ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:testCompile (default-testCompile) @ projectxserver ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-surefire-plugin:2.22.0:test (default-test) @ projectxserver ---
[INFO] Surefire report directory: C:\Users\pupeno\Documents\projectx\code\projectxserver\target\surefire-reports
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  5.463 s
[INFO] Finished at: 2019-09-24T18:10:19+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.22.0:test (default-test) on project projectxserver: Execution default-test of goal org.apache.maven.plugins:maven-surefire-plugin:2.22.0:test failed: Unsupported class file major version 56 -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.22.0:test (default-test) on project projectxserver: Execution default-test of goal org.apache.maven.plugins:maven-surefire-plugin:2.22.0:test failed: Unsupported class file major version 56
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:215)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:567)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-test of goal org.apache.maven.plugins:maven-surefire-plugin:2.22.0:test failed: Unsupported class file major version 56
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:148)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:567)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
Caused by: java.lang.IllegalArgumentException: Unsupported class file major version 56
    at org.objectweb.asm.ClassReader.<init> (ClassReader.java:166)
    at org.objectweb.asm.ClassReader.<init> (ClassReader.java:148)
    at org.objectweb.asm.ClassReader.<init> (ClassReader.java:136)
    at org.objectweb.asm.ClassReader.<init> (ClassReader.java:237)
    at org.codehaus.plexus.languages.java.jpms.AsmModuleInfoParser.parse (AsmModuleInfoParser.java:115)
    at org.codehaus.plexus.languages.java.jpms.AsmModuleInfoParser.getModuleDescriptor (AsmModuleInfoParser.java:60)
    at org.codehaus.plexus.languages.java.jpms.LocationManager.resolvePaths (LocationManager.java:91)
    at org.apache.maven.plugin.surefire.AbstractSurefireMojo.newStartupConfigForModularClasspath (AbstractSurefireMojo.java:1810)
    at org.apache.maven.plugin.surefire.AbstractSurefireMojo.createStartupConfiguration (AbstractSurefireMojo.java:1753)
    at org.apache.maven.plugin.surefire.AbstractSurefireMojo.createForkStarter (AbstractSurefireMojo.java:2103)
    at org.apache.maven.plugin.surefire.AbstractSurefireMojo.executeProvider (AbstractSurefireMojo.java:1191)
    at org.apache.maven.plugin.surefire.AbstractSurefireMojo.executeAfterPreconditionsChecked (AbstractSurefireMojo.java:1022)
    at org.apache.maven.plugin.surefire.AbstractSurefireMojo.execute (AbstractSurefireMojo.java:868)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:288)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:192)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:567)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
[ERROR]
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.8.1</version>
            <configuration>
                <source>10</source>
                <target>10</target>
            </configuration>
        </plugin>

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.22.0:test (default-test) on project projectxserver: Execution default-test of goal org.apache.maven.plugins:maven-surefire-plugin:2.22.0:test failed: Unsupported class file major version 55 -> [Help 1]