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Editorial Team
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Asked: 2026-06-11T18:57:07+00:00

There was a change in Java 1.7 in the way the default Locale is

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There was a change in Java 1.7 in the way the default Locale is get from the OS. There are methods of restoring the old behaviour e.g. by setting the flag -Dsun.locale.formatasdefault=true when starting a JVM instance.

I would like to set this flag permanently so that I don’t have to specify it in command line arguments each time when I start a JVM instance. Is there a file or any other possibility to change the default settings for JVM? Something like the Eclipse.ini file but for the JVM itself?

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1 Answer

  1. Editorial Team

    You can set set environment variable JAVA_TOOL_OPTIONS in your OS. All Java tools (java, javac, ..) will pick this variable up and use it. So you could e.g. use

    SET JAVA_TOOL_OPTIONS=-Dsun.locale.formatasdefault=true

    I use this to force a specific locale for each JVM.

    But this only works if your application is started through the Java tools. If it is e.g. started from a C program that calls the jvm DLL this won’t be used.

    Edit: I just tested it, and it seems JAVA_TOOLS_OPTIONS is also picked up when the DLLs are started (verified with a Swing application that uses WinRun4J as a launcher)

    See: http://docs.oracle.com/javase/7/docs/webnotes/tsg/TSG-VM/html/envvars.html

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