Monday, July 03, 2006

Invalid or corrupt jarfile

"Invalid or corrupt jarfile" java -jar manifest file

Packaging up a class with a main method into a jar-file using ant gives the following error when you try to run it with the java -jar [jarfile] command: "Invalid or corrupt jarfile".

Using the ant task to create the manifest file on-the-fly gives you and entry like:
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.6.2
Created-By: 1.4.2_07-b05 (Sun Microsystems Inc.)
Main-Class: com.example.MyMainClass

Creating the manifest file myself, with the bare essentials fixes the issue:
Manifest-Version: 1.0
Main-Class: com.example.MyMainClass

With more investigation I'm sure I could have got the dynamic meta-file creation working with Ant as I know other people do - there must be some peculiarity in the combination of my ant version (1.6.2), java version (1.4.2_07) and perhaps the current phase of the moon.

Parsing of the Meta-inf file has been an issue that has come-up, been fixed and then come-up again for sun. See: Bug Id: 4991229. If you can work out if this bug exists in the your (or my) version of the Java SE you have more patience that me.

1 comment:

PV said...

NICE! Old, but save my day!