Failing tests that should be passing

Hi,

We have an installation of TeamCity professional that we're evaluating (among other CI products) and we've ran into a weird build issue. We have an 'ant'-based Java project that compiles and passes all unit tests with flying colors when run from the command line, as well as while using a different CI product. In TeamCity, however, there are 2 tests that are reported as failed, and we're not sure why.

The TeamCity installation is hosted on a Ubuntu Linux system, with a MySQL backend.
We have two build agents, one running on the same Ubuntu system, and another running remotely on a OSX Leopard machine. Both build agents report the same two tests as failed. (as I said, all tests pass just fine when ran from command line, or from within a different CI product)

Below I pasted the output of the two failing tests:

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XStreamTest.repositoryXStreamTest (org.meandre.core.engine)
com.thoughtworks.xstream.converters.ConversionException: Could not call sun.net.www.http.KeepAliveCache.writeObject()
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Debugging information -

message : Could not call sun.net.www.http.KeepAliveCache.writeObject()

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XStreamTest.coreSerializationTest (org.meandre.core.engine)
junit.framework.AssertionFailedError: This exeception should have not been thrown:com.thoughtworks.xstream.converters.ConversionException: Could not call sun.net.www.http.KeepAliveCache.writeObject()
-

Debugging information -

message : Could not call sun.net.www.http.KeepAliveCache.writeObject()

Attached you will find the details of each failed test.

Any idea how to make these tests pass?

Thank you,
Boris Capitanu