Question

Any tool for automatically generating unit tests for Java code?

UPDATE:
Primary intended use is to quickly generate unit tests for legacy code that is going to be refactored. No need to automatically keep the tests in sync with the code after automatic generation.

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Almost same question was asked here, but the answer was for .NET instead of Java (Pex was the accepted answer):

Automatic generation of Unit test cases for .NET and Java

Answer 1

• CodePro Analytix has a JUnit test generation module that sounds like it will do what you want. See the User Guide.
• [CoView] was a reasonably priced product, at only $9.99 per user per year, unfortunately it doesn’t exist anymore.
• AgitarOne Automated JUnit Generation is worth investigating.

All three products have a try before you buy option, so you could use them to compare the generated code against a small subset of your application.