[jboss-jira] [JBoss JIRA] (WFLY-3068) could fail more gracefully when wrong Java version used

[Eduardo Silva (JIRA)]

    [ https://issues.jboss.org/browse/WFLY-3068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13064805#comment-13064805 ] 

Eduardo Silva commented on WFLY-3068:
-------------------------------------

This is a common error that happens when you try to load/run classes with a previous runtime version. This is an known issue that is easy to figure out what you are doing wrong.

Anyway, PluggableMBeanServerBuilder belongs to the WildFly Core. (WFCORE)

> could fail more gracefully when wrong Java version used
> -------------------------------------------------------
>
>                 Key: WFLY-3068
>                 URL: https://issues.jboss.org/browse/WFLY-3068
>             Project: WildFly
>          Issue Type: Bug
>          Components: Class Loading, Server
>    Affects Versions: 8.0.0.Final
>         Environment: Java version < 7
>            Reporter: dpocock
>            Priority: Minor
>
> If I try to start Wildfly with Java 6 (which is no longer support of course) it just fails with a stack:
> 09:51:00,536 INFO  [org.jboss.modules] (main) JBoss Modules version 1.3.0.Final
> 09:51:00,543 WARN  [org.jboss.modules] (main) Failed to define class org.jboss.as.jmx.PluggableMBeanServerBuilder in Module "org.jboss.as.jmx:main" from local module loader @36b60b93 (finder: local module finder @69b1fbf4 ()): java.lang.UnsupportedClassVersionError: org/jboss/as/jmx/PluggableMBeanServerBuilder : Unsupported major.minor version 51.0
> 	at java.lang.ClassLoader.defineClass1(Native Method) [rt.jar:1.6.0_26]
> 	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631) [rt.jar:1.6.0_26]
> 	at java.lang.ClassLoader.defineClass(ClassLoader.java:615) [rt.jar:1.6.0_26]
> 	at org.jboss.modules.ModuleClassLoader.doDefineOrLoadClass(ModuleClassLoader.java:345) [jboss-modules.jar:1.3.0.Final]
> 	at org.jboss.modules.ModuleClassLoader.defineClass(ModuleClassLoader.java:423) [jboss-modules.jar:1.3.0.Final]
> 	at org.jboss.modules.ModuleClassLoader.loadClassLocal(ModuleClassLoader.java:261) [jboss-modules.jar:1.3.0.Final]
> 	at org.jboss.modules.ModuleClassLoader$1.loadClassLocal(ModuleClassLoader.java:76) [jboss-modules.jar:1.3.0.Final]
> 	at org.jboss.modules.Module.loadModuleClass(Module.java:548) [jboss-modules.jar:1.3.0.Final]
> 	at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:189) [jboss-modules.jar:1.3.0.Final]
> 	at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:443) [jboss-modules.jar:1.3.0.Final]
> 	at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:431) [jboss-modules.jar:1.3.0.Final]
> 	at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:373) [jboss-modules.jar:1.3.0.Final]
> 	at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:118) [jboss-modules.jar:1.3.0.Final]
> 	at javax.management.MBeanServerFactory.loadBuilderClass(MBeanServerFactory.java:423) [rt.jar:1.6.0_26]
> 	at javax.management.MBeanServerFactory.checkMBeanServerBuilder(MBeanServerFactory.java:465) [rt.jar:1.6.0_26]
> 	at javax.management.MBeanServerFactory.getNewMBeanServerBuilder(MBeanServerFactory.java:511) [rt.jar:1.6.0_26]
> 	at javax.management.MBeanServerFactory.newMBeanServer(MBeanServerFactory.java:298) [rt.jar:1.6.0_26]
> 	at javax.management.MBeanServerFactory.createMBeanServer(MBeanServerFactory.java:213) [rt.jar:1.6.0_26]
> 	at javax.management.MBeanServerFactory.createMBeanServer(MBeanServerFactory.java:174) [rt.jar:1.6.0_26]
> 	at sun.management.ManagementFactory.createPlatformMBeanServer(ManagementFactory.java:302) [rt.jar:1.6.0_26]
> 	at java.lang.management.ManagementFactory.getPlatformMBeanServer(ManagementFactory.java:504) [rt.jar:1.6.0_26]
> 	at org.jboss.modules.Main.main(Main.java:449) [jboss-modules.jar:1.3.0.Final]
> Exception in thread "main" java.lang.UnsupportedClassVersionError: org/jboss/as/jmx/PluggableMBeanServerBuilder : Unsupported major.minor version 51.0
> 	at java.lang.ClassLoader.defineClass1(Native Method)
> 	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
> 	at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
> 	at org.jboss.modules.ModuleClassLoader.doDefineOrLoadClass(ModuleClassLoader.java:345)
> 	at org.jboss.modules.ModuleClassLoader.defineClass(ModuleClassLoader.java:423)
> 	at org.jboss.modules.ModuleClassLoader.loadClassLocal(ModuleClassLoader.java:261)
> 	at org.jboss.modules.ModuleClassLoader$1.loadClassLocal(ModuleClassLoader.java:76)
> 	at org.jboss.modules.Module.loadModuleClass(Module.java:548)
> 	at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:189)
> 	at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:443)
> 	at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:431)
> 	at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:373)
> 	at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:118)
> 	at javax.management.MBeanServerFactory.loadBuilderClass(MBeanServerFactory.java:423)
> 	at javax.management.MBeanServerFactory.checkMBeanServerBuilder(MBeanServerFactory.java:465)
> 	at javax.management.MBeanServerFactory.getNewMBeanServerBuilder(MBeanServerFactory.java:511)
> 	at javax.management.MBeanServerFactory.newMBeanServer(MBeanServerFactory.java:298)
> 	at javax.management.MBeanServerFactory.createMBeanServer(MBeanServerFactory.java:213)
> 	at javax.management.MBeanServerFactory.createMBeanServer(MBeanServerFactory.java:174)
> 	at sun.management.ManagementFactory.createPlatformMBeanServer(ManagementFactory.java:302)
> 	at java.lang.management.ManagementFactory.getPlatformMBeanServer(ManagementFactory.java:504)
> 	at org.jboss.modules.Main.main(Main.java:449)
> It would be more friendly if it checked the Java version in the main() function and stopped gracefully.  The stack trace is not hard to understand but may not be obvious to everybody.



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