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  1. JDK
  2. JDK-8270801

Print VM arguments with java -Xlog:arguments

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    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 18
    • Component/s: hotspot
    • Labels:
    • Subcomponent:
    • Resolved In Build:
      b07

      Description

      It's useful to print VM arguments to the log file, especially when you are logging several JVM invocations:

      $ java -cp foo -Xlog:gc:file=a.log -Xcomp com.Foo
      $ java -cp foo -Xlog:gc:file=b.log -Xint com.Foo

      After a while, you may forget which process created a.log and which created b.log. Adding vm arguments into the log file will help distinguishing them:

      $ java -cp foo -Xlog:gc,arguments:file=a.log -Xcomp com.Foo
      $ java -cp foo -Xlog:gc,arguments:file=b.log -Xint com.Foo

      $ grep jvm_args a.log b.log
      a.log:[0.015s][info][arguments] jvm_args: -Xlog:gc,arguments:file=a.log -Xint
      b.log:[0.001s][info][arguments] jvm_args: -Xlog:gc,arguments:file=b.log -Xcomp

      ======================

      Here's an example of what the log looks like:

      $ java -Xlog:arguments -Xshare:on -cp ~/tmp -Dxx=yy -esa HelloWorld 1 2 3
      [0.001s][info][arguments] VM Arguments:
      [0.001s][info][arguments] jvm_args: -Xlog:arguments -Xshare:on -Dxx=yy -esa
      [0.001s][info][arguments] java_command: HelloWorld 1 2 3
      [0.001s][info][arguments] java_class_path (initial): /home/user/tmp
      [0.001s][info][arguments] Launcher Type: SUN_STANDARD
      Hello World

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              Assignee:
              iklam Ioi Lam
              Reporter:
              iklam Ioi Lam
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