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java_home(1)                                                                                    java_home(1)



NAME
       java_home - return a value for $JAVA_HOME


SYNOPSIS
       /usr/libexec/java_home [options]


DESCRIPTION
       The  java_home  command  returns  a path suitable for setting the JAVA_HOME environment variable.  It
       determines this path from the user's enabled and preferred JVMs in the Java Preferences  application.
       Additional  constraints may be provided to filter the list of JVMs available.  By default, if no con-straints constraints
       straints match the available list of JVMs, the default order is used.  The path is printed  to  stan-dard standard
       dard output.


OPTIONS
       -v or --version  version
              Filters  the  returned  JVMs  by the major platform version in "JVMVersion" form. Example ver-sions: versions:
              sions: "1.5+", or "1.6*".


       -a or --arch  architecture
              Filters the returned JVMs by the architecture they  support.  Example  architectures:  "i386",
              "x86_64", or "ppc".


       -d or --datamodel  datamodel
              Filters  the  returned  JVMs  capable  of  running in 32 or 64-bit mode. Supported datamodels:
              "-d32" and "-d64". Specifying a datamodel is synonymous with specifying a particular architec-ture. architecture.
              ture.


       -t or --task  task
              Selects  from the list of JVMs which can run a specific task. The order of each of these lists
              is set by the Java Preferences application.  Supported  tasks:  "Applets",  "WebStart",  "Bun-dledApp", "BundledApp",
              dledApp", "JNI" and "CommandLine". The default task is "CommandLine".


       -F or --failfast
              Immediately  fails  when  filters  return  no JVMs; does not print out the path to the default
              $JAVA_HOME.


       --exec  command ...
              Executes the command at $JAVA_HOME/bin/<command> and passes the remaining arguments. Any argu-ments arguments
              ments to select which $JAVA_HOME to use must precede the --exec option.


       -X or --xml
              Prints the list of selected JVMs and associated properties as an XML plist to stdout.


       -V or --verbose
              Prints the matching list of JVMs and architectures to stderr.


       -h or --help
              Brief usage information.


USAGE
       /usr/libexec/java_home  helps  users  set a $JAVA_HOME in their login rc files, or provides a way for
       command-line Java tools to use the most appropriate JVM which can satisfy a minimum version or archi-tecture architecture
       tecture  requirement.  The --exec argument can invoke tools in the selected $JAVA_HOME/bin directory,
       which is useful for starting Java command-line tools from launchd plists without hardcoding the  full
       path to the Java command-line tool.


       Usage for bash-style shells:
              $ export JAVA_HOME=`/usr/libexec/java_home`

       Usage for csh-style shells:
              % setenv JAVA_HOME `/usr/libexec/java_home`




                                               04 August 2010                                   java_home(1)