[PATCH] More DefinitionException improvements

Hi,

Here are a few more improvements for usages of DefinitionException (I've
had to add some of them to debug what's going wrong - usually simply
some jar not in the classpath). It's almost impossible to figure this
out without this patch :-)

Ex:

aspectwerkz:weave:
    [java] org.codehaus.aspectwerkz.compiler.CompileException: weaver
failed for class: java.lang.Ob
ject
[...]
    [java] nested:
    [java] org.codehaus.aspectwerkz.exception.DefinitionException:
method pattern is not well formed
: * someMethod(..)
[...]
    [java] java.lang.NoClassDefFoundError:
com/karneim/util/collection/regex/Pattern
[...]

Thanks

-Vincent
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