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  1. Maven Javadoc Plugin
  2. MJAVADOC-582

Getting "Unsupported class file major version 55" when trying to run Javadoc

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Details

    • Bug
    • Status: Closed
    • Minor
    • Resolution: Duplicate
    • 3.0.1
    • None
    • javadoc
    • None
    • I have managed to reproduce this with WIndows and Linux computers running Java 11. With Java 10 it seems to work fine.

    Description

      When running `mvn javadoc:javadoc -e` on a Java 11 project I get the below error. This seems to only be happening with Java 11. The maven plugin works fine for Java 10.

      I have stripped my project down to the bare minimum where I could reproduce it. Currently the project has 2 sub modules along with a pom file (content listed below)

      pom.xml

      core/ (sub-module)

      emulator/ (sub-module)

      ```

      [ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:3.0.1:javadoc (default-cli) on project emulator: Execution default-cli of goal org.apache.maven.plugins:maven-javadoc-plugin:3.0.1:javadoc failed: Unsupported class file major version 55 -> [Help 1]
      org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:3.0.1:javadoc (default-cli) on project emulator: Execution default-cli of goal org.apache.maven.plugins:maven-javadoc-plugin:3.0.1:javadoc failed: Unsupported class file major version 55
      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:566)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
      at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
      at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
      Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default-cli of goal org.apache.maven.plugins:maven-javadoc-plugin:3.0.1:javadoc failed: Unsupported class file major version 55
      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:566)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
      at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
      at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
      Caused by: java.lang.IllegalArgumentException: Unsupported class file major version 55
      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:99)
      at org.codehaus.plexus.languages.java.jpms.LocationManager.resolvePaths (LocationManager.java:127)
      at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.addJavadocOptions (AbstractJavadocMojo.java:4696)
      at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.executeReport (AbstractJavadocMojo.java:2069)
      at org.apache.maven.plugins.javadoc.JavadocReport.generate (JavadocReport.java:134)
      at org.apache.maven.plugins.javadoc.JavadocReport.doExecute (JavadocReport.java:329)
      at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.execute (AbstractJavadocMojo.java:1912)
      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:566)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
      at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
      at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
      [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
      [ERROR]
      [ERROR] After correcting the problems, you can resume the build with the command
      [ERROR] mvn <goals> -rf :emulator

       

      ```

       

      ```

       

      <?xml version="1.0" encoding="UTF-8"?>
      <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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
      <groupId>...</groupId>
      <artifactId>...</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <packaging>pom</packaging>
      <modules>
      <module>core</module>
      <module>emulator</module>
      </modules>

      <build>
      <plugins>
      <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-compiler-plugin</artifactId>
      <version>3.8.0</version>
      <configuration>
      <source>11</source>
      <target>11</target>
      </configuration>
      </plugin>
      <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-javadoc-plugin</artifactId>
      <version>3.0.1</version>
      <configuration>
      <source>11</source>
      <target>11</target>
      </configuration>
      </plugin>
      </plugins>
      </build>

      <properties>
      <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
      </properties>
      </project>

      ```

       

      The emulator module is currently just a single empty class.

       

      I don't know what other information I can provide but I'll try to help as much as possible if you ask for anything else

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              Updated:
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