java.lang.OutOfMemoryError: Java heap space
   at java.util.Arrays.copyOf(Arrays.java:3332)
   at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:137)
   at java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:121)
   at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:421)
   at java.lang.StringBuilder.append(StringBuilder.java:136)
   at org.netbeans.modules.editor.fold.FoldHierarchyTransactionImpl.<init>(FoldHierarchyTransactionImpl.java:199)
   at org.netbeans.modules.editor.fold.FoldHierarchyExecution.openTransaction(FoldHierarchyExecution.java:662)
   at org.netbeans.modules.editor.fold.FoldOperationImpl.openTransaction(FoldOperationImpl.java:202)
   at org.netbeans.spi.editor.fold.FoldOperation.openTransaction(FoldOperation.java:313)
   at org.netbeans.modules.editor.fold.CustomFoldManager$1.run(CustomFoldManager.java:176)
   at org.netbeans.editor.BaseDocument.render(BaseDocument.java:1391)
   at org.netbeans.modules.editor.fold.CustomFoldManager.run(CustomFoldManager.java:160)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)