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Build Identifier: M20110909-1335 I've found some strange exception in the error log: Java Model Exception: Java Model Status [Unknown javadoc format for TODO {key=Lcom/sun/xml/internal/bind/v2/TODO;} [in TODO.class [in com.sun.xml.internal.bind.v2 [in C:\Program Files\Java\jdk1.6.0_27\jre\lib\rt.jar]]]] at org.eclipse.jdt.internal.core.JavadocContents.getTypeDoc(JavadocContents.java:77) at org.eclipse.jdt.internal.core.BinaryType.getAttachedJavadoc(BinaryType.java:997) at org.eclipse.jdt.internal.ui.text.javadoc.JavadocContentAccess2.getHTMLContent(JavadocContentAccess2.java:462) at org.eclipse.jdt.internal.ui.text.java.hover.JavadocHover.getHoverInfo(JavadocHover.java:621) at org.eclipse.jdt.internal.ui.text.java.hover.JavadocHover.internalGetHoverInfo(JavadocHover.java:567) at org.eclipse.jdt.internal.ui.text.java.hover.JavadocHover.getHoverInfo2(JavadocHover.java:559) at org.eclipse.jdt.internal.ui.text.java.hover.BestMatchHover.getHoverInfo2(BestMatchHover.java:142) at org.eclipse.jdt.internal.ui.text.java.hover.JavaEditorTextHoverProxy.getHoverInfo2(JavaEditorTextHoverProxy.java:85) at org.eclipse.jface.text.TextViewerHoverManager$4.run(TextViewerHoverManager.java:166) Reproducible: Didn't try
Java tooling bugs go to JDT, not Platform IDE.
Looks like some bad Javadoc is attached to your rt.jar.