java.lang.OutOfMemoryError: PermGen space Errors When Compiling with Maven in Bamboo Project

We are seeing intermittent failures of our maven builds for a particular project caused by memory issues. The following error log falls out on the last component that is compiled in the project:

build 18-Nov-2013 09:10:10 [INFO] -------------------------------------------------------------
build 18-Nov-2013 09:10:10 [ERROR] COMPILATION ERROR :
build 18-Nov-2013 09:10:10 [INFO] -------------------------------------------------------------
build 18-Nov-2013 09:10:10 [ERROR] Failure executing javac, but could not parse the error:
build 18-Nov-2013 09:10:10
build 18-Nov-2013 09:10:10
build 18-Nov-2013 09:10:10 The system is out of resources.
build 18-Nov-2013 09:10:10 Consult the following stack trace for details.
build 18-Nov-2013 09:10:10 java.lang.OutOfMemoryError: PermGen space
build 18-Nov-2013 09:10:10 at com.sun.tools.javac.comp.Check.<init>(Check.java:836)
build 18-Nov-2013 09:10:10 at com.sun.tools.javac.comp.Check.instance(Check.java:86)
build 18-Nov-2013 09:10:10 at com.sun.tools.javac.code.Types.<init>(Types.java:101)
build 18-Nov-2013 09:10:10 at com.sun.tools.javac.code.Types.instance(Types.java:88)
build 18-Nov-2013 09:10:10 at com.sun.tools.javac.jvm.ClassReader.<init>(ClassReader.java:264)
build 18-Nov-2013 09:10:10 at com.sun.tools.javac.jvm.ClassReader.instance(ClassReader.java:226)
build 18-Nov-2013 09:10:10 at com.sun.tools.javac.main.JavaCompiler.<init>(JavaCompiler.java:331)
build 18-Nov-2013 09:10:10 at com.sun.tools.javac.main.JavaCompiler.instance(JavaCompiler.java:88)
build 18-Nov-2013 09:10:10 at com.sun.tools.javac.main.Main.compile(Main.java:424)
build 18-Nov-2013 09:10:10 at com.sun.tools.javac.main.Main.compile(Main.java:353)
build 18-Nov-2013 09:10:10 at com.sun.tools.javac.main.Main.compile(Main.java:342)
build 18-Nov-2013 09:10:10 at com.sun.tools.javac.main.Main.compile(Main.java:333)
build 18-Nov-2013 09:10:10 at com.sun.tools.javac.Main.compile(Main.java:94)
build 18-Nov-2013 09:10:10 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
build 18-Nov-2013 09:10:10 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
build 18-Nov-2013 09:10:10 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
build 18-Nov-2013 09:10:10 at java.lang.reflect.Method.invoke(Method.java:606)
build 18-Nov-2013 09:10:10 at org.codehaus.plexus.compiler.javac.JavacCompiler.compileInProcess(JavacCompiler.java:554)
build 18-Nov-2013 09:10:10 at org.codehaus.plexus.compiler.javac.JavacCompiler.compile(JavacCompiler.java:161)
build 18-Nov-2013 09:10:10 at org.apache.maven.plugin.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:605)
build 18-Nov-2013 09:10:10 at org.apache.maven.plugin.TestCompilerMojo.execute(TestCompilerMojo.java:161)
build 18-Nov-2013 09:10:10 at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
build 18-Nov-2013 09:10:10 at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
build 18-Nov-2013 09:10:10 at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
build 18-Nov-2013 09:10:10 at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
build 18-Nov-2013 09:10:10 at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
build 18-Nov-2013 09:10:10 at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
build 18-Nov-2013 09:10:10 at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
build 18-Nov-2013 09:10:10 at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
build 18-Nov-2013 09:10:10 at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
build 18-Nov-2013 09:10:10 at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
build 18-Nov-2013 09:10:10 at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)

We are running Bamboo 4.4.4 build 3506 with the following Maven and Java versions:

Apache Maven 3.0.4 (r1232337; 2012-01-17 03:44:56-0500)
Maven home: /usr/share/maven3
Java version: 1.7.0_40, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-7-oracle/jre
Default locale: en_CA, platform encoding: UTF-8
OS name: "linux", version: "3.2.0-53-generic", arch: "amd64", family: "unix"

The contents of our wrapper.conf file are attached. I've tried rebuilding a number of times but the system seems to be stuck on lack of resources. Here is a "free -m" output from the Ubuntu server running our Bamboo:

total used free shared buffers cached
Mem: 32173 27268 4904 0 530 20528
-/+ buffers/cache: 6209 25964
Swap: 17409 19 17390