92 lines
4.4 KiB
Groff
92 lines
4.4 KiB
Groff
'\" t
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.\" Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
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.\"
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.\" DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.\"
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.\" This code is free software; you can redistribute it and/or modify it
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.\" under the terms of the GNU General Public License version 2 only, as
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.\" published by the Free Software Foundation.
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.\"
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.\" This code is distributed in the hope that it will be useful, but WITHOUT
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.\" ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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.\" FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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.\" version 2 for more details (a copy is included in the LICENSE file that
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.\" accompanied this code).
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.\"
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.\" You should have received a copy of the GNU General Public License version
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.\" 2 along with this work; if not, write to the Free Software Foundation,
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.\" Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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.\"
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.\" Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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.\" or visit www.oracle.com if you need additional information or have any
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.\" questions.
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.\"
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.\" Arch: generic
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.\" Software: JDK 8
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.\" Date: 21 November 2013
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.\" SectDesc: Basic Tools
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.\" Title: extcheck.1
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.\"
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.if n .pl 99999
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.TH extcheck 1 "21 November 2013" "JDK 8" "Basic Tools"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH NAME
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extcheck \- Detects version conflicts between a target Java Archive (JAR) file and currently installed extension JAR files\&.
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.SH SYNOPSIS
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.sp
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.nf
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\fBextcheck\fR [\fIoptions\fR] \fItargetfile\&.jar\fR
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.fi
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.sp
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.TP
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\fIoptions\fR
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The command-line options\&. See Options\&.
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.TP
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\fItargetfile\&.jar\fR
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The target JAR file against which the currently installed extension JAR files are compared to detect version conflicts\&.
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.SH DESCRIPTION
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The \f3extcheck\fR 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\&.
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.PP
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The \f3extcheck\fR command compares the Specification-title and Specification-version headers in the manifest of the \f3targetfile\&.jar\fR file against the corresponding headers in all JAR files currently installed in the extension directory\&. By default, the extension directory is \f3jre/lib/ext\fR on Oracle Solaris and \f3\ejre\elib\eext\fR on Windows\&. The \f3extcheck\fR command compares version numbers in the same way as the \f3java\&.lang\&.Package\&.isCompatibleWith\fR method\&.
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.PP
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If no conflict is detected, then the return code is 0\&.
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.PP
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If the manifest of any JAR file in the extensions directory has the same \f3Specification-title\fR and the same or a newer \f3Specification-version\fR number, then a non-zero error code is returned\&. A non-zero error code is also returned when \f3targetfile\&.jar\fR does not have the \f3Specification-title\fR or \f3Specification-version\fR attributes in its manifest file\&.
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.SH OPTIONS
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.TP
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-verbose
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.br
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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\&.
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.TP
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-J\fIoption\fR
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.br
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Passes \fIoption\fR to the Java Virtual Machine (JVM), where option is one of the options described on the reference page for the Java launcher\&. For example, \f3-J-Xms48m\fR sets the startup memory to 48 MB\&. See java(1)\&.
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.SH SEE\ ALSO
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.TP 0.2i
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\(bu
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jar(1)
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.RE
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.br
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'pl 8.5i
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'bp
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