Compiled class file

*.class

Log file

*.log

BlueJ files

*.ctxt

Mobile Tools for Java (J2ME)

.mtj.tmp/

Package Files

*.jar *.war *.nar *.ear *.zip *.tar.gz *.rar

virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml

hs_err_pid*