I ran into a kind of baffling problem. I’ve got some .NET code that is also accessible to Java via JNI. There are unit tests for the .NET code that all pass. To test the Java to .NET connection, I wrote a few JUnit tests which worked fine when run from the IDE, but failed when run from Ant. The failure was ultimately caused by an ArgumentException when creating an XmlSerializer.

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I always have a hard time keeping straight all the possible ways of getting an assembly’s name and what form the various methods return. Here’s a little program and its output for a reference.

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