Expiring a lot of builds causes Bamboo to go into GC and eventually OOM

2010-06-17 01:03:03,966 WARN [QuartzScheduler_Worker-7] [BuildExpiryBean] Unable to expire JIRAFUNC-JDK16BATCH01-1473
java.lang.NullPointerException
        at org.acegisecurity.context.ThreadLocalSecurityContextHolderStrategy.getContext(ThreadLocalSecurityContextHolderStrategy.java:43)
        at org.acegisecurity.context.SecurityContextHolder.getContext(SecurityContextHolder.java:74)
        at com.atlassian.bamboo.security.acegi.intercept.aopalliance.AuthorityOverrideMethodSecurityInterceptor.invoke(AuthorityOverrideMethodSecurityInterceptor.java:20)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
        at $Proxy23.removeArtifacts(Unknown Source)
        at com.atlassian.bamboo.build.expiry.BuildExpiryBean.expireBuild(BuildExpiryBean.java:223)
        at com.atlassian.bamboo.build.expiry.BuildExpiryBean.expireAllBuilds(BuildExpiryBean.java:111)
        at com.atlassian.bamboo.build.expiry.BuildExpiryScheduler$BuildExpiryJob.execute(BuildExpiryScheduler.java:112)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
        at com.atlassian.bamboo.quartz.SystemAuthorizedThreadPool$1.run(SystemAuthorizedThreadPool.java:36)
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:525)