JMagick is an open source Java interface of ImageMagick. It is implemented in the form of a thin Java Native Interface (JNI) layer into the ImageMagick API.
Project is now hosted on https://github.com/techblue/jmagick.
Old home page http://www.jmagick.org/ stille has some old binaries that might be usefull.
Simple to use.
Great app jmagick
jmagick works nicely