August 6th, 2008 
Ntt.cc 
Problem Summary： When I compile a project including thousands MXML and AS files with Flex Ant, I got an error message as below displayed in the Console panel of Flex Builder:
- java.lang.OutOfMemoryError: Java heap space
- at java.util.HashMap.resize(Unknown Source)
- at java.util.HashMap.addEntry(Unknown Source)
It seems that the memory usage of my JRE reaches its limitation — as we know, Flex Builder is running in JRE. Here is a simple way to solve this problem. It‘s just changing the preferences settings of Flex Builder.
Solution Summary: There are two useful arguments of JRE to control the memory usage:
- -Xms define the minimum usage of memory by JRE
- -Xmx define the maximum usage of memory by JRE
I just set –Xmx to 1024m to satisfy the usage of compiling such huge Flex project.
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One day, i want to compile my business app with TestSuiteRunner (from FlexUnit) app at one time using Flex Builder, but i never do this before. Flex Builder can not set two application once. But, it can set modules to be compiled.
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Preparation: use the codes below to add new mxml component:
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When I compiled “flex3_sdk ->samples ->explorer ->containers ->SimpleTitleWindowExample.mxml” with mxmlc and run it,i got the error below: 
For example , you have something like this:
