OutOfMemoryError while parsing test results

In a very large build, lots of files and directories and about 100 projects, I got the following error at the end of the build log:

simple 19-Dec-2008 19:53:44 Build process for 'Main - Main All Sample Template Test' returned with return code = 0
simple 19-Dec-2008 19:53:44 Parsing test results...
error 19-Dec-2008 20:00:55 Failed to execute the build 'MAIN-MAST-56': Java heap space
simple 19-Dec-2008 20:00:56 Finalising the build...
simple 19-Dec-2008 20:00:56 Stopping timer.
simple 19-Dec-2008 20:00:57 Build MAIN-MAST-56 completed.
simple 19-Dec-2008 20:00:44 Running post build plugin on server 'Clover Delta Calculator'

And the following in the Error Summary for the build:

Failed to execute the build 'MAIN-MAST-56'
java.lang.OutOfMemoryError: Java heap space
at java.lang.String.toCharArray(String.java:2726)
at org.apache.tools.ant.types.selectors.SelectorUtils.match(SelectorUtils.java:334)
at org.apache.tools.ant.types.selectors.SelectorUtils.matchPath(SelectorUtils.java:223)
at org.apache.tools.ant.DirectoryScanner.matchPath(DirectoryScanner.java:448)
at org.apache.tools.ant.DirectoryScanner.isIncluded(DirectoryScanner.java:1159)
at org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1081)
at org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1074)
at org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1074)
at org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1074)
at org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1074)
at org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1074)
at org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1074)
at org.apache.tools.ant.DirectoryScanner.scandir(DirectoryScanner.java:1074)
at org.apache.tools.ant.DirectoryScanner.checkIncludePatterns(DirectoryScanner.java:836)
at org.apache.tools.ant.DirectoryScanner.scan(DirectoryScanner.java:808)
at org.apache.tools.ant.types.AbstractFileSet.getDirectoryScanner(AbstractFileSet.java:358)
at com.atlassian.bamboo.utils.FileVisitor.visitAlLFilesThatMatchAPattern(FileVisitor.java:81)
at com.atlassian.bamboo.utils.FileVisitor.visitFilesThatMatch(FileVisitor.java:58)
at com.atlassian.bamboo.builder.AbstractBuilder.collateTestResults(AbstractBuilder.java:362)
at com.atlassian.bamboo.builder.AbstractBuilder.runBuild(AbstractBuilder.java:280)
at com.atlassian.bamboo.builder.AbstractBuilder.executeBuild(AbstractBuilder.java:232)
at com.atlassian.bamboo.build.pipeline.tasks.ExecuteBuildTask.call(ExecuteBuildTask.java:67)
at com.atlassian.bamboo.v2.build.agent.DefaultBuildAgent.build(DefaultBuildAgent.java:192)
at com.atlassian.bamboo.v2.build.agent.BuildAgentControllerImpl.waitAndPerformBuild(BuildAgentControllerImpl.java:89)
at com.atlassian.bamboo.v2.build.agent.DefaultBuildAgent$1.run(DefaultBuildAgent.java:105)
at com.atlassian.bamboo.build.pipeline.concurrent.NamedThreadFactory$1.run(NamedThreadFactory.java:32)
at edu.emory.mathcs.backport.java.util.concurrent.helpers.ThreadHelpers$1.run(ThreadHelpers.java:34)
at java.lang.Thread.run(Thread.java:619)

Failed to execute the build 'MAIN-MAST-56': Java heap space