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  1. JDK
  2. JDK-8270801

Print VM arguments with java -Xlog:arguments

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Details

    • Enhancement
    • Status: Resolved
    • P4
    • Resolution: Fixed
    • None
    • 18
    • hotspot
    • 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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              iklam Ioi Lam
              iklam Ioi Lam
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                Updated:
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