From issue 142133 :

The memory meter is now very high 385/407MB, I don't know if it is related or not.

Annotation: An error occurred during parsing of '...\grails-app\views\newAgreement\newAgreementWizard\step4.gsp'. 
Please report a bug against GSP and attach dump file '...\.netbeans\dev\var\log\step4.gsp.dump'.
An error occurred during parsing of '...\grails-app\views\newAgreement\newAgreementWizard\step4.gsp'. Please report a 
bug against GSP and attach dump file '...\.netbeans\dev\var\log\step4.gsp.dump'.
Caused: java.util.ConcurrentModificationException
	at java.util.IdentityHashMap$IdentityHashMapIterator.nextIndex(IdentityHashMap.java:715)
	at java.util.IdentityHashMap$KeyIterator.next(IdentityHashMap.java:804)
	at org.netbeans.modules.timers.InstanceWatcher.contains(InstanceWatcher.java:78)
	at org.netbeans.modules.timers.InstanceWatcher.add(InstanceWatcher.java:72)
	at org.netbeans.modules.timers.TimesCollectorPeer$ObjectCountDescripton.add(TimesCollectorPeer.java:214)
	at org.netbeans.modules.timers.TimesCollectorPeer$ObjectCountDescripton.access$000(TimesCollectorPeer.java:189)
	at org.netbeans.modules.timers.TimesCollectorPeer.reportReference(TimesCollectorPeer.java:104)
	at org.netbeans.modules.timers.Install$TimerHandler.publish(Install.java:114)
	at java.util.logging.Logger.log(Logger.java:472)
	at org.netbeans.modules.css.gsf.CSSGSFParser.parseFiles(CSSGSFParser.java:127)
	at org.netbeans.napi.gsfret.source.Source.moveToPhase(Source.java:1004)
	at org.netbeans.napi.gsfret.source.CompilationController.toPhase(CompilationController.java:112)
	at org.netbeans.modules.html.editor.HTMLBracesMatching$1.run(HTMLBracesMatching.java:183)
	at org.netbeans.modules.html.editor.HTMLBracesMatching$1.run(HTMLBracesMatching.java:178)
	at org.netbeans.napi.gsfret.source.Source.runUserActionTask(Source.java:478)
	at org.netbeans.modules.html.editor.HTMLBracesMatching.findMatches(HTMLBracesMatching.java:173)
	at org.netbeans.modules.editor.bracesmatching.MasterMatcher$Result._run(MasterMatcher.java:546)
	at org.netbeans.modules.editor.bracesmatching.MasterMatcher$Result.run(MasterMatcher.java:487)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)