# Problems with java.lang.OutOfMemoryError: Java heap space **URL:** \ **Category:** CloverDX Platform\ **Created:** [December 1, 2009, 12:00am UTC](https://forum.cloverdx.com/t/problems-with-java-lang-outofmemoryerror-java-heap-space/635 "2009-12-01T00:00:00Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![rafael\_velazquez](https://avatars.discourse-cdn.com/v4/letter/r/4bbf92/32.png) [@rafael\_velazquez](https://forum.cloverdx.com/u/rafael_velazquez)\ **Post date:** [December 1, 2009, 12:00am UTC](https://forum.cloverdx.com/t/problems-with-java-lang-outofmemoryerror-java-heap-space/635/1 "2009-12-01T00:00:00Z")
Hi, I am new to clover etl and I am modifying some applications that use clover ETL. When I running my application it throws the following exception: Exception in thread “LOOKUP1” java.lang.OutOfMemoryError: Java heap space Exception in thread “WatchDog” java.lang.OutOfMemoryError: Java heap space The Error ocurrs in this node The file where Clover makes the LOOKUP is quite big: 6915782 lines. I wonder if I use the commercial engine of Clover ETL will fix this problem or if it is a hardware problem. How could I solve this issue? Please help. ---
**Author:** ![avackova](https://avatars.discourse-cdn.com/v4/letter/a/65b543/32.png) [@avackova](https://forum.cloverdx.com/u/avackova)\ **Post date:** [December 1, 2009, 8:46am UTC](https://forum.cloverdx.com/t/problems-with-java-lang-outofmemoryerror-java-heap-space/635/2 "2009-12-01T08:46:27Z")
Hello, your custom node probably stores all data in the memory, so you need to set more memory for the jvm (see [Fine-tuning CloverETL](http://wiki.clovergui.net/doku.php?id=running#fine-tuning%5Fcloveretl)). If you have CloverDesigner, the above settings can be configured in CloverETL launch configuration (see [Running Graphs](http://www.cloveretl.com/documentation/UserGuide/index.jsp?topic=/com.cloveretl.gui.docs/docs/running-graphs.html)).