Today, while playing with som large PDF-files in a servlet, I ran into some mysterious errors. It starts with:

2007-08-08 14:11:10 HTTP JVM: JVMDG315: JVM Requesting Heap dump file
2007-08-08 14:11:10 HTTP JVM: // Version: J2RE 1.4.2 IBM Windows 32 build cn1420-20040626
2007-08-08 14:11:10 HTTP JVM: 0x05E90200
2007-08-08 14:11:10 HTTP JVM: [361168]
2007-08-08 14:11:10 HTTP JVM: byte[]

And goes on forever.
After some searhing it turns out the default MaxHeapSize on Domino 7 is only 64MB.

The fix to increase it is:

JavaMaxHeapSize=128MB

In notes.ini. For my application I even had to go to 512MB to be on the safe side.

Anyone else who has had these side effects? Maybe someone can be helped by this.

Good tip! That might come in handy.
Do you know if it's the same default settings for Domino 8?

Nope, I have not checked it. Anyone knows how to determine the MaxHeapSize programatically?

It is a bit scary but I have reason to believe that if your Java program uses up the Heap it will dump the heap to the notes log. Thats is a lot of logging...

Others are reporting the same issue. Anyone encountered this?

This was not the behavior of the 6 version.