extcheck - Online Linux Manual PageSection : 1
Updated : 21 November 2013
Source : JDK 8
Note : Basic Tools

NAMEextcheck − Detects version conflicts between a target Java Archive (JAR) file and currently installed extension JAR files​.

SYNOPSISextcheck [options] targetfile​.jaroptions  The command-line options​. See Options​. targetfile​.jar  The target JAR file against which the currently installed extension JAR files are compared to detect version conflicts​.

DESCRIPTIONThe 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​.

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  
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)​.

SEE ALSO•  jar(1)
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