How do I set the default locale in the JVM

Question

I want to set the default Locale for my JVM to fr CA  What are the possible options to do this   I know of only one option Locale setDefault

User · Answer

You can set it on the command line via JVM parameters:

java -Duser.country=CA -Duser.language=fr ... com.x.Main

For further information look at Internationalization: Understanding Locale in the Java Platform - Using Locale

User · Answer

In the answers here  up to now  we find two ways of changing the JRE locale setting    Programatically  using Locale setDefault    which  in my case  was the solution  since I didn t want to require any action of the user    Locale setDefault new Locale  pt    BR      Via arguments to the JVM   java -jar anApp jar -Duser language pt-BR    But  just as reference  I want to note that  on Windows  there is one more way of changing the locale used by the JRE  as documented here  changing the system-wide language      Note  You must be logged in with an account that has Administrative Privileges          Click Start   Control Panel    Windows 7 and Vista  Click Clock  Language and Region   Region and Language       Windows XP  Double click the Regional and Language Options   icon        The Regional and Language Options dialog box appears    Windows 7  Click the Administrative tab       Windows XP and Vista  Click the Advanced tab        If there is no Advanced tab  then you are not logged in with   administrative privileges     Under the Language for non-Unicode programs section  select the desired language from the drop down menu    Click OK       The system displays a dialog box asking whether to use existing   files or to install from the operating system CD  Ensure that you have   the CD ready    Follow the guided instructions to install the files    Restart the computer after the installation is complete       Certainly on Linux the JRE also uses the system settings to determine which locale to use  but the instructions to set the system-wide language change from distro to distro

User · Answer

There is another away if you don t like to change System locale but the JVM  you can setup a System  or user  Environment variable JAVA TOOL OPTIONS and set its value to -Duser language en-US or any other language-REGION you want

User · Answer

You can use JVM args  java -Duser country ES -Duser language es -Duser variant Traditional WIN

User · Answer

You can enforce VM arguments for a JAR file with the following code   import java io File  import java lang management ManagementFactory  import java lang management RuntimeMXBean  import java net URISyntaxException  import java util ArrayList  import java util List   public class JVMArgumentEnforcer       private String argument       public JVMArgumentEnforcer String argument                this argument   argument             public static long getTotalPhysicalMemory                 com sun management OperatingSystemMXBean bean                    com sun management OperatingSystemMXBean                          java lang management ManagementFactory getOperatingSystemMXBean            return bean getTotalPhysicalMemorySize               public static boolean isUsing64BitJavaInstallation                 String bitVersion   System getProperty  sun arch data model             return bitVersion equals  64               private boolean hasTargetArgument                 RuntimeMXBean runtimeMXBean   ManagementFactory getRuntimeMXBean            List lt String gt  inputArguments   runtimeMXBean getInputArguments             return inputArguments contains argument              public void forceArgument   throws Exception               if   hasTargetArgument                             This won t work from IDEs             if  JARUtilities isRunningFromJARFile                                     Supply the desired argument                 restartApplication                  else                               throw new IllegalStateException  Please supply the VM argument with your IDE      argument                                      private void restartApplication   throws Exception               String javaBinary   getJavaBinaryPath            ArrayList lt String gt  command   new ArrayList lt  gt             command add javaBinary           command add  -jar            command add argument           String currentJARFilePath   JARUtilities getCurrentJARFilePath            command add currentJARFilePath            ProcessBuilder processBuilder   new ProcessBuilder command           processBuilder start                Kill the current process         System exit 0              private String getJavaBinaryPath                 return System getProperty  java home                     File separator    bin                    File separator    java              public static class JARUtilities               static boolean isRunningFromJARFile   throws URISyntaxException                       File currentJarFile   getCurrentJARFile                 return currentJarFile getName   endsWith   jar                       static String getCurrentJARFilePath   throws URISyntaxException                       File currentJarFile   getCurrentJARFile                 return currentJarFile getPath                       private static File getCurrentJARFile   throws URISyntaxException                       return new File JVMArgumentEnforcer class getProtectionDomain   getCodeSource   getLocation   toURI                         It is used as follows   JVMArgumentEnforcer jvmArgumentEnforcer   new JVMArgumentEnforcer  -Duser language pt-BR       For example jvmArgumentEnforcer forceArgument

User · Answer

You can do this       And to capture locale  You can do this   private static final String LOCALE   LocaleContextHolder getLocale   getLanguage                  -    LocaleContextHolder getLocale   getCountry

User · Answer

From the Oracle Reference      The default locale of your application is determined in three ways    First  unless you have explicitly changed the default  the   Locale getDefault   method returns the locale that was initially determined   by the Java Virtual Machine  JVM  when it first loaded  That is  the   JVM determines the default locale from the host environment  The host   environment s locale is determined by the host operating system and   the user preferences established on that system       Second  on some Java runtime implementations  the application user can   override the host s default locale by providing this information on   the command line by setting the user language  user country  and   user variant system properties       Third  your application can call the Locale setDefault Locale    method  The setDefault Locale aLocale  method lets your application   set a systemwide  actually VM-wide  resource  After you set the default locale with this   method  subsequent calls to Locale getDefault   will return the newly   set locale

[java] How do I set the default locale in the JVM?

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