Hyperlinking to Java method from routes editor throws exception

[skyluc]

This problem was made visible by scala-ide/scala-ide#562.

The problem comes from the fact that an askLoadedType is triggered when searching for the Java right method, to create the IHyperlink instance. Before the change in Scala IDE, askLoadedType would fail after the timeout. With the change, an exception is correctly thrown

scala.tools.eclipse.ScalaPresentationCompiler$InvalidThread: Tried to execute `askLoadedType` while inside `ask`
    at scala.tools.eclipse.LoadedTypeAdapter$class.loadedType(ScalaPresentationCompiler.scala:103)
    at scala.tools.eclipse.ScalaPresentationCompiler.loadedType(ScalaPresentationCompiler.scala:113)
    at scala.tools.eclipse.javaelements.ScalaCompilationUnit$$anonfun$reportMatches$1.apply(ScalaCompilationUnit.scala:252)
    at scala.tools.eclipse.javaelements.ScalaCompilationUnit$$anonfun$reportMatches$1.apply(ScalaCompilationUnit.scala:251)
    at scala.tools.eclipse.InteractiveCompilationUnit$$anonfun$doWithSourceFile$1.apply(InteractiveCompilationUnit.scala:60)
    at scala.tools.eclipse.InteractiveCompilationUnit$$anonfun$doWithSourceFile$1.apply(InteractiveCompilationUnit.scala:60)
    at scala.tools.eclipse.ScalaPresentationCompilerProxy$$anonfun$apply$1.apply(ScalaPresentationCompilerProxy.scala:72)
    at scala.tools.eclipse.ScalaPresentationCompilerProxy$$anonfun$apply$1.apply(ScalaPresentationCompilerProxy.scala:72)
    at scala.Option.flatMap(Option.scala:170)
    at scala.tools.eclipse.ScalaPresentationCompilerProxy.apply(ScalaPresentationCompilerProxy.scala:72)
    at scala.tools.eclipse.InteractiveCompilationUnit$class.doWithSourceFile(InteractiveCompilationUnit.scala:60)
    at scala.tools.eclipse.javaelements.ScalaSourceFile.doWithSourceFile(ScalaSourceFile.scala:77)
    at scala.tools.eclipse.javaelements.ScalaCompilationUnit$class.reportMatches(ScalaCompilationUnit.scala:251)
    at scala.tools.eclipse.javaelements.ScalaSourceFile.reportMatches(ScalaSourceFile.scala:77)
    at scala.tools.eclipse.contribution.weaving.jdt.search.SearchAspect.ajc$around$scala_tools_eclipse_contribution_weaving_jdt_search_SearchAspect$2$5ae075ec(SearchAspect.aj:45)
    at org.eclipse.jdt.internal.core.search.matching.MatchLocator.process(MatchLocator.java:1680)
    at org.eclipse.jdt.internal.core.search.matching.MatchLocator.locateMatches(MatchLocator.java:1141)
    at org.eclipse.jdt.internal.core.search.matching.MatchLocator.locateMatches(MatchLocator.java:1182)
    at org.eclipse.jdt.internal.core.search.matching.MatchLocator.locateMatches(MatchLocator.java:1314)
    at org.eclipse.jdt.internal.core.search.JavaSearchParticipant.locateMatches(JavaSearchParticipant.java:95)
    at org.eclipse.jdt.internal.core.search.BasicSearchEngine.findMatches(BasicSearchEngine.java:231)
    at org.eclipse.jdt.internal.core.search.BasicSearchEngine.search(BasicSearchEngine.java:515)
    at org.scalaide.play2.routeeditor.hyperlink.MethodFinder.doSearch(MethodFinder.scala:39)
    at org.scalaide.play2.routeeditor.hyperlink.MethodFinder.searchMethod(MethodFinder.scala:31)
    at org.scalaide.play2.routeeditor.hyperlink.MethodFinder.searchMethod(MethodFinder.scala:27)
    at org.scalaide.play2.routeeditor.hyperlink.RouteHyperlinkComputer$$anonfun$detectHyperlinks$1$$anonfun$2$$anonfun$apply$1$$anonfun$6.apply(RouteHyperlinkComputer.scala:69)
    at org.scalaide.play2.routeeditor.hyperlink.RouteHyperlinkComputer$$anonfun$detectHyperlinks$1$$anonfun$2$$anonfun$apply$1$$anonfun$6.apply(RouteHyperlinkComputer.scala:66)
    at scala.Option.flatMap(Option.scala:170)
    at org.scalaide.play2.routeeditor.hyperlink.RouteHyperlinkComputer$$anonfun$detectHyperlinks$1$$anonfun$2$$anonfun$apply$1.apply(RouteHyperlinkComputer.scala:65)
    at org.scalaide.play2.routeeditor.hyperlink.RouteHyperlinkComputer$$anonfun$detectHyperlinks$1$$anonfun$2$$anonfun$apply$1.apply(RouteHyperlinkComputer.scala:23)
    at scala.tools.nsc.util.InterruptReq.execute(InterruptReq.scala:26)
    at scala.tools.nsc.interactive.Global.pollForWork(Global.scala:339)
    at scala.tools.nsc.interactive.PresentationCompilerThread.run(PresentationCompilerThread.scala:22)