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This page is a rewrite of http://wiki.netbeans.org/InsufficientMemoryToIndexRoot
This message occurs when there is not enough memory to index the source root. This is usually caused by too low -Xmx setting (by default it is set to 20% of the System Memory). If this is not the case (the -Xmx is set to relatively high value) you may have encountered a bug.
In that case please report bug at Apache JIRA, choose 'ide - Performance' as component and if possible please attach the messages.log file and upload zipped heap dump.