> We can see following error when we run `findsym` on CLHSDB which connects to > remote debug server. > > > hsdb> verbose true > hsdb> findsym gHotSpotVMTypes > 0x00007f913d4a45b0Error: java.lang.NullPointerException: Cannot invoke > "sun.jvm.hotspot.debugger.cdbg.CDebugger.loadObjectContainingPC(sun.jvm.hotspot.debugger.Address)" > because "cdbg" is null > java.lang.NullPointerException: Cannot invoke > "sun.jvm.hotspot.debugger.cdbg.CDebugger.loadObjectContainingPC(sun.jvm.hotspot.debugger.Address)" > because "cdbg" is null > at > jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor$7.doit(CommandProcessor.java:618) > at > jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:2116) > at > jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.executeCommand(CommandProcessor.java:2086) > at > jdk.hotspot.agent/sun.jvm.hotspot.CommandProcessor.run(CommandProcessor.java:1957) > at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.run(CLHSDB.java:112) > at jdk.hotspot.agent/sun.jvm.hotspot.CLHSDB.main(CLHSDB.java:44) > at > jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.runCLHSDB(SALauncher.java:282) > at > jdk.hotspot.agent/sun.jvm.hotspot.SALauncher.main(SALauncher.java:493) > > > The cause of this NPE is that CDebugger is null. It happens when the > debugger is running on debugd server. > Command line debugger like CLHSDB can delegate the command to debugd, like > `pmap` and `pstack`. `findsym` can also use this scheme. > > This PR has passed serviceability/sa tests on Linux x64.
Yasumasa Suenaga has updated the pull request incrementally with one additional commit since the last revision: Remove unused imports ------------- Changes: - all: https://git.openjdk.java.net/jdk/pull/3582/files - new: https://git.openjdk.java.net/jdk/pull/3582/files/b6bbadac..6ef93d7d Webrevs: - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3582&range=01 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3582&range=00-01 Stats: 2 lines in 1 file changed: 0 ins; 2 del; 0 mod Patch: https://git.openjdk.java.net/jdk/pull/3582.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/3582/head:pull/3582 PR: https://git.openjdk.java.net/jdk/pull/3582
