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extcheck(1)                                                        extcheck(1)

       extcheck - A utility to detect jar conflicts

          extcheck  detects  version  conflicts  between a target jar file and
          currently installed extension jar files.

       extcheck [ -verbose ] targetfile.jar

       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.

             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.

             Pass option to the Java virtual machine, where option is  one  of
             the  options described on the reference page for the java(1). For
             example, -J-Xms48m sets the startup memory to 48 megabytes.


                                  06 Apr 2010                      extcheck(1)

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Gedruckt am: 14.12.2017 11:16 GMT+0100 (2017-12-14T11:16:37+01:00)