extcheck(1) extcheck(1)
NAME
extcheck - jar conflict detection utility
SYNOPSIS
extcheck [ -verbose ] [ -Joption ] targetfile.jar
DESCRIPTION
The extcheck utility checks a specified jar file for title and version
conflicts with any extensions installed in the JDK software. 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 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
The following options are supported:
-verbose Lists jar files in the extension directory as they are
checked. Additionally, manifest attributes of the tar-
get 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 man page for the
java application launcher, java(1). For example, -J-
Xms48m sets the startup memory to 48 megabytes.
SEE ALSO
jar(1)
13 June 2000 extcheck(1)
Mac OS X 10.7.4 - Generated Thu May 10 07:29:24 CDT 2012