The JAR must be a regular Java JAR file. There were issues on older versions of Guvnor that meant that once a JAR had been uploaded you needed to restart the web-server, but I believe this has been resolved. Building the package should give you all validation errors. The warning icon, I assume being that to which you refer, indicates there is a validation error. On 18 February 2013 12:07, oresch <olaf.resch(a)t-online.de&gt; wrote: Sorry to ask this basic question. What does the pojo.jar contain? Is there a required format for the class. Is there an example? I tried to pack the .java and the .class in various formats, but even though the upload is working there is a warning sign next to the asset and I can not use the content. By the way, how can I see what the warning sign acctually means? Best wishes Olaf -- View this message in context: http://drools.46999.n3.nabble.com/POJO-jar-Format-for-upload-a-fact-model... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users