So far, we have identified 2 major issues with Java 1.6 update 45 (32bit and 64bit). Unfortunately. this is the last officially version released for Java 1.6.

We recommend using earlier versions of the JVM. We have found that Java 1.6.0_37-b06 is very stable and have been using this version of Java in our desktop PDF editor PDF Studio (version 9) with success.

Memory Management Issue

There seems to be an issue with memory management (memory leak?) or garbage collection in Java 1.6 update 45. The same code with the same memory allocation that works with previous updates will throw a Java heap space exception in update 45. For instance, we ran into this exception when converting a PDF document to images:

java.lang.OutOfMemoryError: Java heap space
at java.awt.image.DataBufferInt.<init>(
at java.awt.image.Raster.createPackedRaster(
at java.awt.image.DirectColorModel.createCompatibleWritableRaster(
at java.awt.image.BufferedImage.<init>(
at com.qoppa.pdfProcess.PDFPage.getImage(


LineBreakMeasurer Broken

A bug was introduced in the LineBreakMeasurer class, which is being used in jWordConvert:

java.lang.ArrayIndexOutOfBoundsException: 0
at sun.font.ExtendedTextSourceLabel.createCharinfo(
at sun.font.ExtendedTextSourceLabel.getCharinfo(
at sun.font.ExtendedTextSourceLabel.getLineBreakIndex(
at java.awt.font.TextMeasurer.calcLineBreak(
at java.awt.font.TextMeasurer.getLineBreakIndex(
at java.awt.font.LineBreakMeasurer.nextOffset(
at java.awt.font.LineBreakMeasurer.nextLayout(
at com.qoppa.j.b.b.b.g.d(Unknown Source)