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)
