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extcheck(1)			  Basic	Tools			   extcheck(1)

       extcheck	- Detects version conflicts between a target Java Archive
       (JAR) file and currently	installed extension JAR	files.

       extcheck	[options] targetfile.jar

	      The command-line options.	See Options.

	      The target JAR file against which	the currently installed
	      extension	JAR files are compared to detect version conflicts.

       The extcheck command checks a specified JAR file	for title and version
       conflicts with any extensions installed in the Java SE SDK. Before
       installing an extension,	you can	use this utility to see	whether	the
       same or a more recent version of	the extension is already installed.

       The extcheck command compares the Specification-title and
       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. By	default, the extension
       directory is jre/lib/ext	on Oracle Solaris and \jre\lib\ext on Windows.
       The extcheck command compares version numbers in	the same way as	the
       java.lang.Package.isCompatibleWith method.

       If no conflict is detected, then	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, then a non-zero error code is returned. A non-zero error	code
       is also returned	when targetfile.jar does not have the Specification-
       title or	Specification-version attributes in its	manifest file.

	      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.

	      Passes option to the Java	Virtual	Machine	(JVM), where option is
	      one of the options described on the reference page for the Java
	      launcher.	For example, -J-Xms48m sets the	startup	memory to 48
	      MB. See java(1).

       o jar(1)

JDK 8			       21 November 2013			   extcheck(1)


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