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Spring IDE for Eclipse breaks JDT weaving

I experiences a problem, when trying to use Scala IDE for Eclipse and Spring IDE at the same time in Eclipse 3.5 Galileo on Mac OS X:

Scala IDE need JDT weaving support, however the JDT weaving seems to be broken by Spring IDE. If Spring IDE is installed and JDT Weaving is enabled, on startup the following problem occurrs:

[org.eclipse.equinox.weaving.hook] info adding AspectJ hooks ...
[org.eclipse.equinox.weaving.aspectj] info Starting AspectJ weaving service ...
21.03.2010 18:29:10 error
SCHWERWIEGEND: register definition failed
java.lang.ClassCastException: org.aspectj.weaver.loadtime.definition.Definition cannot be cast to org.aspectj.weaver.loadtime.definition.Definition
    at ...

This problem seems to be related to the fact that the plugin brings a second class file for org.aspectj.weaver.loadtime.definition.Definition in addition to the class file already shipped with Eclipse. This probably cause the ClassCastException on startup.

By uninstalling the Spring IDE features, this problem can be resolved and JDT Weaving can be enabled.