Hello,
I was using dbunit's Ant integration and have a for loop that exports a bunch
of dataset into many small xml files (less than
5-50kb each). After repeating <dbunit> task for ~50 times, I got an
OutOfMemoryException: PermGen space.
(DbUnit v2.4.8 w/ Ant 1.8.2)
C:\test\build.xml:364: java.lang.OutOfMemoryError: PermGen space
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
at
org.apache.tools.ant.AntClassLoader.defineClassFromData(AntClassLoader.java:1124)
at
org.apache.tools.ant.AntClassLoader.getClassFromStream(AntClassLoader.java:1295)
at
org.apache.tools.ant.AntClassLoader.findClassInComponents(AntClassLoader.java:1351)
at
org.apache.tools.ant.AntClassLoader.findClass(AntClassLoader.java:1311)
at
org.apache.tools.ant.AntClassLoader.loadClass(AntClassLoader.java:1064)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
at
org.apache.tools.ant.AntClassLoader.defineClassFromData(AntClassLoader.java:1124)
at
org.apache.tools.ant.AntClassLoader.getClassFromStream(AntClassLoader.java:1295)
at
org.apache.tools.ant.AntClassLoader.findClassInComponents(AntClassLoader.java:1351)
at
org.apache.tools.ant.AntClassLoader.findClass(AntClassLoader.java:1311)
at
org.apache.tools.ant.AntClassLoader.loadClass(AntClassLoader.java:1064)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
at
org.apache.tools.ant.AntClassLoader.defineClassFromData(AntClassLoader.java:1124)
at
org.apache.tools.ant.AntClassLoader.getClassFromStream(AntClassLoader.java:1295)
at
org.apache.tools.ant.AntClassLoader.findClassInComponents(AntClassLoader.java:1351)
at
org.apache.tools.ant.AntClassLoader.findClass(AntClassLoader.java:1311)
at
org.apache.tools.ant.AntClassLoader.loadClass(AntClassLoader.java:1064)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
at
org.apache.tools.ant.AntClassLoader.defineClassFromData(AntClassLoader.java:1124)
at
org.apache.tools.ant.AntClassLoader.getClassFromStream(AntClassLoader.java:1295)
Although I read that using -Xmx256m will solve the problem, I am curious why
this problem occurred in the first place? I am able to import a single 50MB xml
file
without
specifying -Xmx option, so in theory, exporting 100 50kb xml files
should NOT cause any problems. Also, the problem can be simulated
by repeating the following ~100 times in a single Ant task.
<target name="test-dbunit-export>
<!-- export individual dataset -->
<dbunit driver="${mysql.driver}"
url="${mysql.url}/database"
userid="${mysql.userid}"
password="${mysql.password}"
classpath="${mysql.classpath}">
<export format="xml" dest="${dbunit.data.dir}/test1.xml">
<query name="tableQuery" sql="SELECT * FROM table WHERE
column=''"/>
</export>
</dbunit>
<dbunit> ... </dbunit>
<dbunit> ... </dbunit>
<dbunit> ... </dbunit>
... <!-- repeat dbunit many times! -->
<dbunit> ... </dbunit>
</target>
When I look at task manager, the Java process (running Ant) seems to consume
more and more memory, once it reaches above 130MB, the exception is
thrown. Is there some sort optimization that could be done in the code to
alleviate this problem?
I also tried the latest Ant 1.8.4, with similar errors:
java.lang.OutOfMemoryError: PermGen space
at java.lang.Throwable.getStackTraceElement(Native Method)
at java.lang.Throwable.getOurStackTrace(Throwable.java:591)
at java.lang.Throwable.printStackTrace(Throwable.java:462)
at java.lang.Throwable.printStackTrace(Throwable.java:451)
at org.apache.tools.ant.Main.runBuild(Main.java:838)
at org.apache.tools.ant.Main.startAnt(Main.java:217)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)
PermGen space java.lang.OutOfMemoryError: PermGen space
at java.lang.Runtime.exit(Runtime.java:90)
at java.lang.System.exit(System.java:904)
at org.apache.tools.ant.Main.exit(Main.java:245)
at org.apache.tools.ant.Main.startAnt(Main.java:235)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)
Thank you!
Charles
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