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1. Answer : RFS: pleiades - Japanese Language package for Eclipse ...
Could you try updated package? pleiades failed without libjavassist-java present; I think you should also add libcommons-lang-java and libcommons-io-java to Depends (since
http://us.generation-nt.com/answer/rfs-pleiades-japanese-language-package-eclipse-using-dynamic-aop-help-195077851.html
2. Debian -- Software Packages in "sid", Subsection java
libjavassist-java (1:3.12.1.ga-1) library for editing bytecodes in Java libjavatar-java (2.5+dfsg-5) ... dsp package for the Light Development Spectrum Analyzer libkml-java (1.3.0~r863-3 ...
http://packages.debian.org/sid/java/
3. Debian -- Software Packages in "squeeze", Subsection java
libjavassist-java (1:3.12-2) library for editing bytecodes in Java libjavatar-java (2.5+dfsg-4) ... virtual package provided by openjdk-6-jre-headless openjdk-6-source (6b18-1.8.10-0 ...
http://packages.debian.org/stable/java/