处理图像时，带有RPGLE接口的iSeries JAVA程序崩溃

I have made a java program that creates PDF files based to GnuPdf. It runs perfectly when run using native java code (on windows or iSeries QSH), however, when run through an RPGLE interface, the program crashes (at what seems like random intervals) when processing images. I tracked down one of these down to loading an image from a .jar file and removed the call from the code. It worked for a while but is now crashing for images loaded from IFS. Maybe RPGLE is locking the files somehow, and ideas? The code is called from a Service Program.I have made a java program that creates PDF fil