JxBeauty - Sourcecode formatter and beautifier for Java files. [Freeware] - http://members.aon.at/johann.langhofer/jxb.htm
Jalopy - Configurable source code formatter and style checker. Commercial successor of the Open Source Jalopy. - http://www.triemax.com/
Checkstyle - A development tool to help programmers write Java code that adheres to a coding standard. By default it supports the Sun Code Conventions, but is highly configurable. [Open source, LGPL] - http://checkstyle.sourceforge.net/
ImportScrubber - Utility to neaten up import statements in a source files. [LGPL] - http://sourceforge.net/projects/importscrubber/
Jacobe - Free configurable Java code beautifier, which supports the widely used Java coding conventions from Sun Microsystems. [Freeware] - http://www.tiobe.com/jacobe.htm
JPretty - A source code beautifier for java. [Freeware] - http://www.mmsindia.com/JPretty.html
Jindent - A source code formatter for Java with custom coding style support. [Commercial] - http://www.jindent.com/