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From "Sharma, Jaikumar" <jaikumar.sha...@barco.com>
Subject RE: Best practises for Ant Memory usage
Date Sun, 22 Jun 2008 07:09:45 GMT

Create system variable ANT_OPTS and set the value of this to -DXms=1024M
-DXmx=1024M -XX:+UseParallelGC
Hope this would help, I had similar problem, which was solved using
this.


-----Original Message-----
From: Ravi Roy [mailto:ravi.aroy@gmail.com] 
Sent: Friday, June 20, 2008 6:55 PM
To: Ant Users List; Henning Bredel
Subject: Re: Best practises for Ant Memory usage

Hi,
Thanks for your reply Henning. Yes, javac causes memory error, following
is the error message. I am using Sun JDK 1.6.0_03-b05.
________________________________________________________________________
_________
compile:
    [javac] Compiling 4 source files to d:\Build\iPiece\Java\iTool\bin
    [javac]
    [javac]
    [javac] The system is out of resources.
    [javac] Consult the following stack trace for details.
    [javac] java.lang.OutOfMemoryError: Java heap space
    [javac]  at com.sun.tools.javac.util.Name.fromChars(Name.java:115)
    [javac]  at com.sun.tools.javac.util.Name.fromString(Name.java:144)
    [javac]  at com.sun.tools.javac.util.Name.fromString(Name.java:150)
    [javac]  at
com.sun.tools.javac.util.Name$Table.fromString(Name.java:529)
    [javac]  at
com.sun.tools.javac.jvm.ClassWriter.writePool(ClassWriter.java:510)
    [javac]  at
com.sun.tools.javac.jvm.ClassWriter.writeClassFile(ClassWriter.java:1565
)
    [javac]  at
com.sun.tools.javac.jvm.ClassWriter.writeClass(ClassWriter.java:1443)
    [javac]  at
com.sun.tools.javac.main.JavaCompiler.genCode(JavaCompiler.java:618)
    [javac]  at
com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1289)
    [javac]  at
com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1259)
    [javac]  at
com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:765)
    [javac]  at
com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:730)
    [javac]  at com.sun.tools.javac.main.Main.compile(Main.java:353)
    [javac]  at com.sun.tools.javac.main.Main.compile(Main.java:279)
    [javac]  at com.sun.tools.javac.main.Main.compile(Main.java:270)
    [javac]  at com.sun.tools.javac.Main.compile(Main.java:69)
    [javac]  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native
Method)
    [javac]  at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
a:39)
    [javac]  at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)
    [javac]  at java.lang.reflect.Method.invoke(Method.java:597)
    [javac]  at
org.apache.tools.ant.taskdefs.compilers.Javac13.execute(Javac13.java:56)
    [javac]  at
org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:1065)
    [javac]  at
org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:882)
    [javac]  at
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
    [javac]  at sun.reflect.GeneratedMethodAccessor179.invoke(Unknown
Source)
    [javac]  at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)
    [javac]  at java.lang.reflect.Method.invoke(Method.java:597)
    [javac]  at
org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:1
06)
    [javac]  at org.apache.tools.ant.Task.perform(Task.java:348)
    [javac]  at org.apache.tools.ant.Target.execute(Target.java:357)
    [javac]  at
org.apache.tools.ant.Target.performTasks(Target.java:385)
    [javac]  at
org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)

BUILD FAILED

D:\Build\iPiece\build.xml:209: The following error occurred while
executing this line:
d:\Build\Ant\Main-Targets.xml:9: The following error occurred while
executing this line:
d:\Build\Ant\Main-Targets.xml:32: The following error occurred while
executing this line:
d:\Build\iPiece\Java\iTool\build_itool.xml:23: Compile failed; see the
compiler error output for details.
 at
org.apache.tools.ant.ProjectHelper.addLocationToBuildException(ProjectHe
lper.java:508)
 at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:418)
 at
org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:105)
 at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
a:39)
 at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at
org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:1
06)
 at org.apache.tools.ant.Task.perform(Task.java:348)
 at org.apache.tools.ant.Target.execute(Target.java:357)
 at org.apache.tools.ant.Target.performTasks(Target.java:385)
 at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
 at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
 at
org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecut
or.java:41)
 at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
 at org.apache.tools.ant.Main.runBuild(Main.java:758)
 at org.apache.tools.ant.Main.startAnt(Main.java:217)
 at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)
 at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)
________________________________________________________________________
_________

I have set ANT_OPTS to -DXms=1536m -DXmx=1536m , earlier it was set to
1024m.

Thanks.
Regards,
Ravi.


On Fri, Jun 20, 2008 at 4:33 PM, Henning Bredel <h.bredel@gmx.de> wrote:
>> From time to time, I get Out-Of-Memory errors in Ant (Ant 1.7.0), I 
>> would like to know the best practises from the people who have 
>> experience with Ant Memory Management. Some set of tips & tricks..
>> would help every one here..
>
> Are you sure, that ant causes the memory error? For example it could 
> be the javac command which runs out of heap size . . .
>
> Please attach an error message to give a hint, what the Out- of-Memory

> error causes.
>
> Regards
>
>  Henning
>

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