Hi Luis Victor,
This bug already fixed in jBPM github repository, you can see Chris Melas post at: https://community.jboss.org/message/738335#738335. The bug was fix at 29th May 2012. So just checkout and build your self from github (very time comsuming) or find a SNAPSHOT build with the time just after 29th May. It did make me some time so I will put my detail, just in hope it helps.
1. Chose a maven repos that keep old SNAPSHOT, example: http://snapshots.jboss.org/maven2/org/jbpm/jbpm-human-task-war/5.3.0-SNAPSHOT/
2. Chose litter newer human-task war file, for example jbpm-human-task-war-5.3.0-20120706.045301-549.war
3. Copy to your jbpm-install/lib and change your jbpm-install/build.xml as follow:
Replace: (search for your line with string after "-" and replace with string after "+", here i used diff for this compare result but don't know how to attach .patch file)
- <available file="${install.home}/lib/jbpm-${jBPM.version}-human-task-war.zip" />
+ <available file="${install.home}/lib/jbpm-human-task-war-5.3.0-20120706.045301-549.war" />
And:
- <unzip src="${install.home}/lib/jbpm-human-task-war-${jBPM.version}.war" dest="${install.home}/target/jbpm-human-task-war" />
+ <unzip src="${install.home}/lib/jbpm-human-task-war-5.3.0-20120706.045301-549.war" dest="${install.home}/target/jbpm-human-task-war" />
3': Or, or rename your jbpm-human-task-war-5.3.0-20120706.045301-549.war (for example) to jbpm-human-task-war-5.3.0.Final.war; zip it and replace jbpm-5.3.0.Final-human-task-war.zip in jbpm-install/lib directory.
Please report back if it's work or not,
- Quang