Exception in thread "Text Viewer Hover Presenter" java.lang.IllegalArgumentException
	at org.eclipse.jdt.core.Signature.getReturnType(Signature.java:1632)
	at org.eclipse.jdt.core.Signature.getReturnType(Signature.java:1648)
	at org.eclipse.jdt.ui.JavaElementLabels.getMethodLabel(JavaElementLabels.java:469)
	at org.eclipse.jdt.ui.JavaElementLabels.getElementLabel(JavaElementLabels.java:386)
	at org.eclipse.jdt.ui.JavaElementLabels.getElementLabel(JavaElementLabels.java:363)
	at org.eclipse.jdt.internal.ui.text.java.hover.JavadocHover.getInfoText(JavadocHover.java:144)
	at org.eclipse.jdt.internal.ui.text.java.hover.JavadocHover.getHoverInfo(JavadocHover.java:119)
	at org.eclipse.jdt.internal.ui.text.java.hover.AbstractJavaEditorTextHover.getHoverInfo(AbstractJavaEditorTextHover.java:120)
	at org.eclipse.jdt.internal.ui.text.java.hover.BestMatchHover.getHoverInfo(BestMatchHover.java:102)
	at org.eclipse.jdt.internal.ui.text.java.hover.JavaEditorTextHoverProxy.getHoverInfo(JavaEditorTextHoverProxy.java:69)
	at org.eclipse.jface.text.TextViewerHoverManager$4.run(TextViewerHoverManager.java:160)