NAME

       java-wrappers - capacities shared by java wrapper scripts

DESCRIPTION

       Most Java programs are not run directly, but through small shell scripts that take care of
       various things, such as finding a suitable java environment and looking for libraries.

       To ease the task of the maintainers, they rely on a library providing  runtime  detection,
       library  detection  and  other features. This manual page describes the common features of
       all those scripts, and to which point you can configure them.  This  is  mainly  done  via
       environment variables.

ENVIRONMENT VARIABLES

       java-wrappers understands some environment variables:

       JAVA_CMD
              The  java command that will be run. If this variable is set, it disables all lookup
              for a java runtime.

       JAVA_BINDIR
              Specifies a directory that will be looked for a java or a jdb executable (depending
              on  the  setting  of JAVA_DEBUGGER).  It has precedence over JAVA_HOME but not over
              JAVA_CMD.

       JAVA_HOME
              A path to a java runtime. If this variable is set, all lookup for a java runtime is
              disabled,  except that if no java executable is found in the path, the command java
              is used.

       JAVA_FLAVOR
              A  probably  more  easy-to-use  version  of  the  JAVA_HOME  variable:  instead  of
              specifying  the  full  path  of  the  java  runtime, you name it. List of available
              flavors can be found in the file /usr/lib/java-wrappers/jvm-list.sh.  See  examples
              below.

       JAVA_DEBUGGER
              If  this is set, the wrapper will try to pick up a java debugger rather than a java
              interpreter. This will fail if the jbd of the runtime found is a stub.

       JAVA_CLASSPATH
              Additional classpath, will have priority over the one found by the wrapper.

       JAVA_ARGS
              Additional arguments  to  the  java  command.  They  will  come  before  all  other
              arguments.

       FORCE_CLASSPATH
              If this variable is set, it will be the only classpath.  You'd better know what you
              are doing.

       DEBUG_WRAPPER
              This is probably the most important variable; if it set, the wrapper will print out
              useful  information  as it goes by its business, such as which runtime it did find,
              and which command is run eventually.

       JAVA_JARPATH
              The path where the wrappers will go looking for  jar  archives.  If  not  set,  the
              wrapper  will  look  into  the  default  directory, /usr/share/java.  Warning : the
              wrapper will not look anywhere else than in JAVA_JARPATH.  Setting  it  incorrectly
              will most probably result in early crashes.

EXAMPLES

       The  examples  all  rely on rasterizer(1), from the package libbatik-java, but they really
       apply to all scripts that use java-wrappers.

       Print out debugging information:

       DEBUG_WRAPPER=1 rasterizer

       Limit rasterizer's memory to 80 MB:

       JAVA_ARGS=-Xmx80m rasterizer

       Force rasterizer to run with kaffe(1):

       JAVA_HOME=/usr/lib/kaffe rasterizer

       The same, but using JAVA_BINDIR:

       JAVA_BINDIR=/usr/lib/kaffe/bin rasterizer

       Force rasterizer to run with openjdk:

       JAVA_FLAVOR=openjdk rasterizer

       Debug rasterizer with Sun's  debugger,  while  printing  debugging  information  from  the
       wrapper:

       DEBUG_WRAPPER=1 JAVA_CMD=/usr/lib/jvm/java-6-sun/bin/jdb rasterizer

BUGS

       Care has been taken to make the wrappers bug-free. If that was not the case, please file a
       bug report against the java-wrappers package.

       If you wish to submit any problem with a java executable relying on java-wrappers,  please
       also  submit  the  output  of the command run with DEBUG_WRAPPER=1.  It will save one mail
       exchange and therefore potentially reduce the time it takes to fix the bug.

DEVELOPERS

       There is currently no documentation about writing a wrapper script save  the  comments  in
       /usr/lib/java-wrappers/java-wrappers.sh.   If  you  have to write one, we suggest you base
       yourself upon, for instance, the rasterizer wrapper script, or any other one (just pick up
       any direct reverse dependency of java-wrappers and look for scripts).

SEE ALSO

       java(1), jdb(1)

       /usr/lib/java-wrappers/java-wrappers.sh

AUTHOR

       java-wrappers and its documentation were written by Vincent Fourmond <fourmond@debian.org>