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We are using Spring 3.0 and they have a dependency to aspectj. Thus we have the runtime Jars on the classpath. Problem is the aspectjweaver.jar contains 1.6 byte code. When starting our application on JBoss 5.1 with JDK 1.5 we get an exception in the logs: Unexpected error during load of:testdata.SomeAnnotation java.lang.UnsupportedClassVersionError: Bad version number in .class file at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:620) at org.jboss.classloader.spi.base.BaseClassLoader.access$200(BaseClassLoader.java:63) at org.jboss.classloader.spi.base.BaseClassLoader$2.run(BaseClassLoader.java:572) at org.jboss.classloader.spi.base.BaseClassLoader$2.run(BaseClassLoader.java:532) at java.security.AccessController.doPrivileged(Native Method) As we are not using aspects from aspectj we don't have a problem ... but others might have. There is a issue for Spring as well: https://issuetracker.springsource.com/browse/EBR-622 Also had a look at the current release 1.6.11 and the same situation there. So as other people have no chance of working around this (other than building the jar themself) I set this to major.
It is actually some rogue testdata classes that have been packaged into the distribution, 3 of them, in the testdata package. All the main classes are of the correct level (1.3/1.5). I've just committed some changes to ensure the testdata code isn't packaged up. I *might* rebuild the 1.6.11 release to remove them.
The latest 1.6.12 snapshots available in our (springsource) maven repo have this fixed. I am not going to rebuild 1.6.11 right now
