From time to time you might run into some issues with SPSS Modeler of running out of memory on Java Virtual Memory.  The way you fix it is by expanding the allocated JVM.

So, in order to do this we mustdo the following…

1. Close SPSS Modeler if you have it open
2. Open C:\Program Files\IBM\SPSS\Modeler\\config\jvm.cfg as Administrator
3. Find the line with the following
   options, "-Xmx256m"
4. Now change "-Xmx256m" to a new value where 256m = RAM.  So if you would like to lets say allocate 1G of RAM, then you will change it to options, "-Xmx1024m".

Source: IBM Streams with Excel export nodes fail with Insufficient memory for JVM – United States