Tools to detect duplicated code (Java)

SonarQube can detect duplicated codes but does not give recommendation on eliminating them. It is free and - although with the default setup it can only detect lexically identical clones

Most of the tools listed on the Wikipedia article on Duplicate Code Tools will detect duplicates in many different languages, including Java.

I use the following tools:

• PMD/CPD (BSD-style License).
• Checkstyle (LGPL License) - support was removed, see details.

Both tools have code duplication detection support. But both of them lack the ability to advise you how to refactor your code.

JetBrains IntelliJ IDEA Ultimate has good static code analysis with code duplication support, but it is not free.

Either Simian or PMD's CPD. The former supports a wider set of languages but is non free for commercial projects.