I had the same problem. somehow, depending on your adapter installation evolution, the JVM will not be version 1.3 even though the directory name says so. Find the version like this:
You can then copy over the contents of the 1.3.1 jdk. if you need to (or create a new folder in the JVM dir and rename the win.sun13 folder). However, I still had to point the adapter’s classpath explicitly to the JVM. Something like:
here is my whole classpath:
If you are using the new adapter manager you can also point the adapter to any JDK version you like (JAVA_HOME), but I didn’t try this.
good luck, Soeren