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...Pertence tool can also be used for finding out threading issues. Just write a test that uses the component you need to test for threading issues and assign load of threads to the test.
Thanks to my employer (Nokia) for letting me publish the initial version of this tool as open-source!
Abbot is a simple framework for unit and functional testing of Java GUIs. Facilitates generating user actions and examining component state. Supports recording and playback on any Java application.
A Portable Thin Client & Server Pair for XA / 2PC Testing
A portable testing tool to validate the configuration of XA and two-phase commit for Java EE 6 Containers. The tool permits the stress-testing, performance characterization and correct transaction semantics of distributed transactions across Three XA resource managers by Exception Injection. The thin-client can be run from the command-line or inside the IDE. The server side component includes EJB packaging and some simple Web servlet support for retrieving diagnostic and performance data from the testbed.
Code Conjurer is a tool which seamlessly integrates into the Eclipse Java development environment and uses the merobase code search engine to recommend software components for reuse. Update site: http://codeconjurer.sourceforge.net/eclipse-update
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Xcarecrows4MDA provides a complete toolset to build models and check their behavior for standalone applications or whole systems with a hierarchical, state driven approach. A test component checks the safety of the model under various situations.
beanSpec is a java based solution for Behaviour Driven Development, specifiying, checking and summarizing the behaviour of a component in a declarative, narrative style.