extcheck Man page

Resume Wikipedia de Java Development Kit

Le Java Development Kit (JDK) désigne un ensemble de bibliothèques logicielles de base du langage de programmation Java, ainsi que les outils avec lesquels le code Java peut être compilé, transformé en bytecode destiné à la machine virtuelle Java.
Il existe plusieurs éditions de JDK, selon la plate-forme Java considérée (et bien évidemment la version de Java ciblée) :
JSE pour la Java 2 Standard Edition également désignée J2SE ;
JEE, sigle de Java Enterprise Edition également désignée J2EE ;
JME ‘Micro Edition’, destinée au marché mobiles ;
etc.
À chacune de ces plateformes correspond une base commune de Development Kits, plus des bibliothèques additionnelles spécifiques selon la plate-forme Java que le JDK cible, mais le terme de JDK est appliqué indistinctement à n’importe laquelle de ces plates-formes.

extcheck Basic Tools extcheck

NAME

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

SYNOPSIS

extcheck [options] targetfile.jar

options
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.

DESCRIPTION

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.

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.

SEE ALSO

· jar

JDK 8 21 November 2013 extcheck