I'm using Jasper Report library 6.2.0 with PHP, so I deployed PHP/Java Bridge on Tomcat 7.
I tested it with a simple report and it worked. Then I moved to the final and more complex report and I got some issues.
To build the .jrxml I'm using Jasper Studio
1) First I discovered making some test with the same report, that to avoid problems when I run the report from php, I must use JAVA as language for expressions in the report
So I think there is some error inside the expressions