A utility to detect jar conflicts extcheck detects version conflicts between a target jar file and currently installed extension jar files.
-verbose ] targetfile.jar
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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.
extcheck utility compares the
Specification-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
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-version attributes in its
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 application
launcher. For example, -J-Xms48m sets the
startup memory to 48 megabytes.