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This is similar to bug 120559. When there is no Javadoc a null is expected to be returned, whereas an exception is thrown. Below is the stacktrace. Version: 4.3.0 Build id: I20121009-0800 java.fullversion=JRE 1.6.0 IBM J9 2.4 Windows 7 amd64-64 jvmwa6460sr9-20101124_69295 (JIT enabled, AOT enabled) J9VM - 20101124_069295 JIT - r9_20101028_17488ifx2 GC - 20101027_AA BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US Framework arguments: -product org.eclipse.sdk.ide Command-line arguments: -product org.eclipse.sdk.ide -data C:\ManjuMathew\eclipse\eclipse-SDK-I20121009-0800-win32-x86_64\WS/../runtime-JDT -dev file:C:/ManjuMathew/eclipse/eclipse-SDK-I20121009-0800-win32-x86_64/WS/.metadata/.plugins/org.eclipse.pde.core/JDT/dev.properties -os win32 -ws win32 -arch x86_64 -consoleLog !ENTRY org.eclipse.jdt.ui 4 10001 2013-01-16 14:29:10.193 !MESSAGE Internal Error !STACK 1 Java Model Exception: Java Model Status [Cannot retrieve the attached javadoc for sun.awt.im [in C:\ManjuMathew\Java\JDK\ibm-java-sdk-70-win-i386\sdk\jre\lib\rt.jar]] at org.eclipse.jdt.internal.core.PackageFragment.getAttachedJavadoc(PackageFragment.java:488) at org.eclipse.jdt.internal.ui.text.javadoc.JavadocContentAccess2.getHTMLContent(JavadocContentAccess2.java:1737) at org.eclipse.jdt.internal.ui.text.java.ProposalInfo.extractJavadoc(ProposalInfo.java:96) at org.eclipse.jdt.internal.ui.text.java.ProposalInfo.computeInfo(ProposalInfo.java:76) at org.eclipse.jdt.internal.ui.text.java.ProposalInfo.getInfo(ProposalInfo.java:61) at org.eclipse.jdt.internal.ui.text.java.AbstractJavaCompletionProposal.getAdditionalProposalInfo(AbstractJavaCompletionProposal.java:555) at org.eclipse.jface.text.contentassist.AdditionalInfoController$3.run(AdditionalInfoController.java:106) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54) !SUBENTRY 1 org.eclipse.jdt.core 4 1008 2013-01-16 14:29:10.196 !MESSAGE Cannot retrieve the attached javadoc for sun.awt.im [in C:\ManjuMathew\Java\JDK\ibm-java-sdk-70-win-i386\sdk\jre\lib\rt.jar]
Released the fix with test via commit: http://git.eclipse.org/c/jdt/eclipse.jdt.core.git/commit/?id=b14a6c4d09a9bece1bab75937908ff44df19fa09
Manju has already verified this to be working. Marking as verified.