OutOfMemoryError when indexing Excel files

2011-03-21 16:53:46,820 ERROR [DefaultQuartzScheduler_Worker-6] [org.quartz.core.JobRunShell] run Job DEFAULT.IndexQueueFlusher threw an unhandled Exception:
java.lang.OutOfMemoryError: Java heap space
        at java.util.Arrays.copyOf(Arrays.java:2882)
        at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:100)
        at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:390)
        at java.lang.StringBuilder.append(StringBuilder.java:119)
        at com.atlassian.confluence.extra.officeconnector.index.excel.ExcelXMLTextExtractor.extractText(ExcelXMLTextExtractor.java:71)
        at com.atlassian.bonnie.search.extractor.BaseAttachmentContentExtractor.addFields(BaseAttachmentContentExtractor.java:40)
        at com.atlassian.confluence.plugin.descriptor.ExtractorModuleDescriptor$BackwardsCompatibleExtractor.addFields(ExtractorModuleDescriptor.java:45)
        at com.atlassian.bonnie.search.BaseDocumentBuilder.getDocument(BaseDocumentBuilder.java:104)
        at com.atlassian.confluence.search.lucene.ConfluenceDocumentBuilder.getDocument(ConfluenceDocumentBuilder.java:102)
        at com.atlassian.confluence.search.lucene.tasks.AddDocumentIndexTask.perform(AddDocumentIndexTask.java:43)
        at com.atlassian.confluence.search.lucene.tasks.UpdateDocumentIndexTask.perform(UpdateDocumentIndexTask.java:40)
        at com.atlassian.confluence.search.lucene.tasks.BulkWriteIndexTask.perform(BulkWriteIndexTask.java:44)
        at com.atlassian.bonnie.LuceneConnection.withWriter(LuceneConnection.java:331)
        at com.atlassian.confluence.search.lucene.tasks.LuceneConnectionBackedIndexTaskPerformer.perform(LuceneConnectionBackedIndexTaskPerformer.java:20)
        at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager$BatchUpdateAction.perform(DefaultConfluenceIndexManager.java:356)
        at com.atlassian.bonnie.LuceneConnection.withBatchUpdate(LuceneConnection.java:405)
        at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager.processTasks(DefaultConfluenceIndexManager.java:155)
        at com.atlassian.confluence.search.lucene.DefaultConfluenceIndexManager.flushQueue(DefaultConfluenceIndexManager.java:121)
        at sun.reflect.GeneratedMethodAccessor620.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
        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 $Proxy36.flushQueue(Unknown Source)
        at com.atlassian.confluence.search.lucene.IndexQueueFlusher.executeJob(IndexQueueFlusher.java:29)
        at com.atlassian.confluence.setup.quartz.AbstractClusterAwareQuartzJobBean.surroundJobExecutionWithLogging(AbstractClusterAwareQuartzJobBean.java:63)
        at com.atlassian.confluence.setup.quartz.AbstractClusterAwareQuartzJobBean.executeInternal(AbstractClusterAwareQuartzJobBean.java:46)
        at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:86)