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From Andreas Lehmkuehler <andr...@lehmi.de>
Subject Incompatible java version on Ubuntu slaves
Date Sat, 01 Nov 2014 14:33:14 GMT

since today we are getting the following exception when building PDFBox

Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version 
number in .class file
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
	at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:244)
	at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:230)
	at org.jvnet.hudson.maven3.agent.Maven3Main.main(Maven3Main.java:135)
	at org.jvnet.hudson.maven3.agent.Maven3Main.main(Maven3Main.java:64)

The 1.8-branch [1] is the only affected PDFBox build. It uses "JDK 5 (latest)" 
and "Maven 3.0.3". The latter doesn't seems to be compiled with a 1.5 compatible 
JDK but with java 6 or newer. As it works before there has to be a incompatible 
change in the configuration of the ubuntu slaves. It looks as if there wasn't 
any jdk5 installed before and jenkins automatically switched to a jdk7.

The question is what maven version can be used in combination with jdk5 latest? 
Is there any maven 3 version compatible with java 5?

Andreas Lehmkühler

[1] https://builds.apache.org/job/PDFBox%201.8.x/

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