Drools 7.0.0.Final: Unsupported major.minor version 52.0 kie-maven-plugin

[Jonathan De Leon]

We are currently using 5.5.0.Final of drools on our web application. We wanted to go to 6.5.0.Final but we noticed a huge compile time increase when building our 400+ drl files. Upon discovering as to why there was an increase, we came across this post https://stackoverflow.com/questions/44406051/drools-6-5-0-drl-compile-time-increased-10-times and saw that there is a fix in 7.1.0. Since 7.1 is still in beta, we opted to update to 7.0 and fix any deprecated code so that the transition from 7.0 to 7.1 won't be difficult. However, we are unable to get the project to compile under 7.0.0.Final receiving the following stack trace

I guess my question is, is Java 7 no longer supported after 6.5.0.Final?

[WARNING] Error injecting: org.kie.maven.plugin.BuildMojo

java.lang.TypeNotPresentException: Type org.kie.maven.plugin.BuildMojo not present

at org.eclipse.sisu.space.URLClassSpace.loadClass(URLClassSpace.java:147)

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:81)

at com.google.inject.internal.InternalFactoryToInitializableAdapter.provision(InternalFactoryToInitializableAdapter.java:53)

at com.google.inject.internal.ProviderInternalFactory$1.call(ProviderInternalFactory.java:65)

at com.google.inject.internal.ProvisionListenerStackCallback$Provision.provision(ProvisionListenerStackCallback.java:115)

at org.eclipse.sisu.bean.BeanScheduler$Activator.onProvision(BeanScheduler.java:176)

at com.google.inject.internal.ProvisionListenerStackCallback$Provision.provision(ProvisionListenerStackCallback.java:126)

at com.google.inject.internal.ProvisionListenerStackCallback.provision(ProvisionListenerStackCallback.java:68)

at com.google.inject.internal.ProviderInternalFactory.circularGet(ProviderInternalFactory.java:63)

at com.google.inject.internal.InternalFactoryToInitializableAdapter.get(InternalFactoryToInitializableAdapter.java:45)

at com.google.inject.internal.InjectorImpl$2$1.call(InjectorImpl.java:1016)

at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1092)

at com.google.inject.internal.InjectorImpl$2.get(InjectorImpl.java:1012)

at org.eclipse.sisu.inject.Guice4$1.get(Guice4.java:162)

at org.eclipse.sisu.inject.LazyBeanEntry.getValue(LazyBeanEntry.java:81)

at org.eclipse.sisu.plexus.LazyPlexusBean.getValue(LazyPlexusBean.java:51)

at org.codehaus.plexus.DefaultPlexusContainer.lookup(DefaultPlexusContainer.java:263)

at org.codehaus.plexus.DefaultPlexusContainer.lookup(DefaultPlexusContainer.java:255)

at org.apache.maven.plugin.internal.DefaultMavenPluginManager.getConfiguredMojo(DefaultMavenPluginManager.java:517)

at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:121)

at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)

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:116)

at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)

at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)

at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)

at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)

at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)

at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)

at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)

at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)

at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

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/kie/maven/plugin/BuildMojo : Unsupported major.minor version 52.0

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(ClassLoader.java:800)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)

at java.net.URLClassLoader.access$100(URLClassLoader.java:71)

at java.net.URLClassLoader$1.run(URLClassLoader.java:361)

at java.net.URLClassLoader$1.run(URLClassLoader.java:355)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:354)

at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:401)

at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)

at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)

at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:247)

at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:239)

at org.eclipse.sisu.space.URLClassSpace.loadClass(URLClassSpace.java:139)

... 42 more

[Abhijit Humbe]

With Drools 7 you have to use JDK 8. If you use Drools 6.5 then it will work with JDK 7 and JDK 8.

Abhijit Humbe

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