extcheck

extcheck(1)                                                        extcheck(1)



NAME
       extcheck - A utility to detect jar conflicts

       extcheck  detects  version conflicts between a target jar file and cur‐
       rently installed extension jar files.

SYNOPSIS
       extcheck [ -verbose ] targetfile.jar


DESCRIPTION
       The extcheck utility checks a specified Jar file for title and  version
       conflicts  with  any  extensions  installed in the Java(TM) SDK. Before
       installing an extension, you can use this utility to see if the same or
       a more recent version of the extension is already installed.

       The  extcheck  utility  compares the Specification-title and Specifica‐
       tion-version headers in the manifest of the targetfile.jar file against
       the  corresponding  headers in all Jar files currently installed in the
       extension  directory.  (The  extension  directory  is  jre/lib/ext   by
       default.) The extcheck utility compares version numbers in the same way
       as the method java.lang.Package.isCompatibleWith.

       If no conflict is detected, the return code is 0.

       If the manifest of any jar file in the  extensions  directory  has  the
       same  Specification-title and the same or a newer Specification-version
       number, a non-zero error code is returned. A  non-zero  error  code  is
       also  returned  if targetfile.jar does not have the Specification-title
       or Specification-version attributes in its manifest.

OPTIONS
       -verbose
          Lists Jar files in the extension  directory  as  they  are  checked.
          Additionally,  manifest  attributes  of  the target jar file and any
          conflicting jar files are also reported.

       -Joption
          Pass option to the Java virtual machine, where option is one of  the
          options  described  on  the  reference page for the java application
          launcher. For example, -J-Xms48m  sets  the  startup  memory  to  48
          megabytes.

SEE ALSO
       jar

                                  05 Aug 2006                      extcheck(1)