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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I am working on an application which contains many components. I have been puzzled by a problem for a long time: Is the memory usage of components built with mxml tag bigger than that of components built in actionScript? I did a simple experiment below to find the truth.
Preparation: use the codes below to add new mxml component:
