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Posted to issues@maven.apache.org by "Robert Scholte (JIRA)" <ji...@apache.org> on 2017/12/15 11:17:00 UTC
[jira] [Closed] (MCOMPILER-319) Maven Compiler not compatible with
Java 1.6
[ https://issues.apache.org/jira/browse/MCOMPILER-319?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Robert Scholte closed MCOMPILER-319.
------------------------------------
Resolution: Not A Problem
Assignee: Robert Scholte
The required *runtime* version is documented on the [Summary page|https://maven.apache.org/plugins/maven-compiler-plugin/project-summary.html]
Be aware there's a difference between the required Java runtime for Maven and the compiler version. These can be 2 different Java instances.
If you want to use Maven Compiler 3.7.0, then Maven must run with Java 7.
To compile with Java 6 at the same time you can use [toolchains|https://maven.apache.org/guides/mini/guide-using-toolchains.html]. With the recent Maven Compiler Plugin you can also refer to a toolchain with the [jdkToolchain|https://maven.apache.org/plugins/maven-compiler-plugin/compile-mojo.html#jdkToolchain] parameter.
One option I'd like to mention is [Animal Sniffer|http://www.mojohaus.org/animal-sniffer/] which can ensure only Java6 code is used.
> Maven Compiler not compatible with Java 1.6
> -------------------------------------------
>
> Key: MCOMPILER-319
> URL: https://issues.apache.org/jira/browse/MCOMPILER-319
> Project: Maven Compiler Plugin
> Issue Type: Bug
> Affects Versions: 3.7.0
> Environment: Apache Maven 3.0.5 (r01de14724cdef164cd33c7c8c2fe155faf9602da; 2013-02-19 14:51:28+0100)
> Maven home: T:\apache-maven\apache-maven-3.0.5
> Java version: 1.6.0_141, vendor: Sun Microsystems Inc.
> Java home: C:\opt\Java\jdk1.6.0_141\jre
> Default locale: en_US, platform encoding: Cp1252
> OS name: "windows 7", version: "6.1", arch: "x86", family: "windows"
> Reporter: Benoît Berthonneau
> Assignee: Robert Scholte
> Priority: Critical
>
> With Maven projects using Java 1.6, the Maven Compiler plugin is not usable. The following error is raised :
> {code:java}
> [WARNING] Error injecting: org.apache.maven.plugin.compiler.CompilerMojo
> java.lang.TypeNotPresentException: Type org.apache.maven.plugin.compiler.CompilerMojo not present
> at org.eclipse.sisu.space.URLClassSpace.loadClass(URLClassSpace.java:115)
> at org.eclipse.sisu.space.NamedClass.load(NamedClass.java:46)
> at org.eclipse.sisu.space.AbstractDeferredClass.get(AbstractDeferredClass.java:48)
> at com.google.inject.internal.ProviderInternalFactory.provision(ProviderInternalFactory.java:86)
> at com.google.inject.internal.InternalFactoryToInitializableAdapter.provision(InternalFactoryToInitializableAdapter.java:55)
> at com.google.inject.internal.ProviderInternalFactory$1.call(ProviderInternalFactory.java:70)
> at com.google.inject.internal.ProvisionListenerStackCallback$Provision.provision(ProvisionListenerStackCallback.java:100)
> at org.eclipse.sisu.plexus.PlexusLifecycleManager.onProvision(PlexusLifecycleManager.java:133)
> at com.google.inject.internal.ProvisionListenerStackCallback$Provision.provision(ProvisionListenerStackCallback.java:109)
> at com.google.inject.internal.ProvisionListenerStackCallback.provision(ProvisionListenerStackCallback.java:55)
> at com.google.inject.internal.ProviderInternalFactory.circularGet(ProviderInternalFactory.java:68)
> at com.google.inject.internal.InternalFactoryToInitializableAdapter.get(InternalFactoryToInitializableAdapter.java:47)
> at com.google.inject.internal.InjectorImpl$2$1.call(InjectorImpl.java:997)
> at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1047)
> at com.google.inject.internal.InjectorImpl$2.get(InjectorImpl.java:993)
> at com.google.inject.Scopes$1$1.get(Scopes.java:59)
> at org.eclipse.sisu.inject.LazyBeanEntry.getValue(LazyBeanEntry.java:82)
> at org.eclipse.sisu.plexus.LazyPlexusBean.getValue(LazyPlexusBean.java:51)
> at org.codehaus.plexus.DefaultPlexusContainer.lookup(DefaultPlexusContainer.java:260)
> at org.codehaus.plexus.DefaultPlexusContainer.lookup(DefaultPlexusContainer.java:252)
> at org.apache.maven.plugin.internal.DefaultMavenPluginManager.getConfiguredMojo(DefaultMavenPluginManager.java:459)
> at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:97)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
> at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
> at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
> at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
> at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
> at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
> at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:317)
> at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:152)
> at org.apache.maven.cli.MavenCli.execute(MavenCli.java:555)
> at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:214)
> at org.apache.maven.cli.MavenCli.main(MavenCli.java:158)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> at java.lang.reflect.Method.invoke(Unknown Source)
> 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.UnsupportedClassVersionError: org/apache/maven/plugin/compiler/CompilerMojo : Unsupported major.minor version 51.0
> at java.lang.ClassLoader.defineClass1(Native Method)
> at java.lang.ClassLoader.defineClassCond(Unknown Source)
> at java.lang.ClassLoader.defineClass(Unknown Source)
> at java.security.SecureClassLoader.defineClass(Unknown Source)
> at java.net.URLClassLoader.defineClass(Unknown Source)
> at java.net.URLClassLoader.access$000(Unknown Source)
> at java.net.URLClassLoader$1.run(Unknown Source)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(Unknown Source)
> at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:389)
> at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)
> at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:259)
> at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:242)
> at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:227)
> at org.eclipse.sisu.space.URLClassSpace.loadClass(URLClassSpace.java:107)
> ... 41 more
> [INFO] ------------------------------------------------------------------------
> [INFO] BUILD FAILURE
> [INFO] ------------------------------------------------------------------------
> [INFO] Total time: 14.976s
> [INFO] Finished at: Fri Dec 15 11:28:25 CET 2017
> [INFO] Final Memory: 6M/16M
> [INFO] ------------------------------------------------------------------------
> [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.7.0:compile (default-compile) on project gc-log-parser: Execution default-compile of goal org.apache.maven.plugins:maven-compiler-plugin:3.7.0:compile failed: Unable to load the mojo 'compile' in the plugin 'org.apache.m
> aven.plugins:maven-compiler-plugin:3.7.0' due to an API incompatibility: org.codehaus.plexus.component.repository.exception.ComponentLookupException: org/apache/maven/plugin/compiler/CompilerMojo : Unsupported major.minor version 51.0
> [ERROR] -----------------------------------------------------
> {code}
> This restriction is not documented on the website. How could we use the plugin in this kind of environment ?
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