how to increase ant permgen size?

问题:

how to increase ant permgen size? I have given in ANT_OPTS as

-Xms768m -Xmx1024m -XX:PermSize=128m -XX:MaxPermSize=128m

question 1)After specifying above setting in system environment, still i am getting outof memeory error for ant target for junit.

Caught an exception while logging the end of the build.  Exception was:
java.lang.OutOfMemoryError: PermGen space

2) when i type in command promt to see what is path for ant_opts, echo %ant_opts% it shows only

-Xmx512m

and other parts skips. is something wrong in my path? Note: i am using command prompt to run ant target.

回答1:

go to my computer->right click->properties->Advanced->environment variables->New(in system/user variable)->

enter

Varible name: ANT_OPTS
Varible Value : -Xms1536m -Xmx1536m -XX:PermSize=1024m -XX:MaxPermSize=2048m

Note:

1. configure values according to your system memory size.

2. This config for windows, for other OS config accordingly

For MAC:

in Terminal, goto pom.xml path in project, run below command:

export MAVEN_OPTS="-Xmx1024m -XX:MaxPermSize=512m" Note: Size is based on system RAM. I used maven instead of old Ant. use MAVEN_OPTS/ANT_OPTS for maven/ant config.

回答2:

What does your test do? Does it call a recursive method?

Also, the values that you enter for your test will override any system setting. Try this in your call to junit in your Ant script:

<junit fork="yes" maxmemory="1024">

回答3:

for my junit ant target I just set fork="true" that way a new jvm would be initiated for the junit tasks, there's also forkmode="perBatch"or "perTest", worked for me!