If possible rather than increasing the heap you might want to change your process to use the Streaming spreadsheet (SXSSF) functionality that POI provides. This will allow you to build much bigger spreadsheets without consuming so much memory.

https://poi.apache.org/spreadsheet/how-to.html#sxssf

If you still want to increase the max heap it would be done using the -Xmx parameter (e.g. Java -Xmx3g Hello)...when I specify -Xmx4g on Java 1.6 I get an error that the value is too large.

Mitch


-----Original Message-----
From: JAVA400-L [mailto:java400-l-bounces@xxxxxxxxxxxx] On Behalf Of Darren Strong
Sent: Wednesday, June 01, 2016 8:27 AM
To: java400-l@xxxxxxxxxxxx
Subject: More than 2GB heap with 64 bit JVM?


I have a certain application running using the JNI (more specifically, RPG calling Java Excel POI HSSF) to create a really large spreadsheet, and its running out of memory/heap. We're running a 64bit JVM. If I can figure out how to specify a larger maximum heap size, can I go beyond the current 2GB limit? Is there a way to alter the maximum heap size for a job? If not by job, by default?

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