Find unused classes in a Java Eclipse project

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I also like to use UCDetector:

screenshot

UCDetector (Unecessary Code Detector) is a Open Source eclipse PlugIn Tool to find unecessary (dead) public java code. It also tries to make code final, protected or private.

Bonus: it can also find cyclic dependencies between classes

(also a number of other tools — including Findbugs — knows how do do that too)

Caveat: Cid mentions in the comments:

UCDetector shall not work if there are interface implementations which will be known only at runtime.
It incorrectly marks the implementation classes as unused.

Update 2017: static code analysis has evolved quite a bit in 8 years.
Using SonarLint for Eclipse, you can use the the latest SonarJava 4.6 plugin to analyze your code.
It will find dead code.

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