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+'\" t
+.\" Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
+.\" DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+.\"
+.\" This code is free software; you can redistribute it and/or modify it
+.\" under the terms of the GNU General Public License version 2 only, as
+.\" published by the Free Software Foundation.
+.\"
+.\" This code is distributed in the hope that it will be useful, but WITHOUT
+.\" ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+.\" FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+.\" version 2 for more details (a copy is included in the LICENSE file that
+.\" accompanied this code).
+.\"
+.\" You should have received a copy of the GNU General Public License version
+.\" 2 along with this work; if not, write to the Free Software Foundation,
+.\" Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+.\"
+.\" Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+.\" or visit www.oracle.com if you need additional information or have any
+.\" questions.
+.\"
+.\"     Arch: generic
+.\"     Software: JDK 8
+.\"     Date: 21 November 2013
+.\"     SectDesc: Basic Tools
+.\"     Title: extcheck.1
+.\"
+.if n .pl 99999
+.TH extcheck 1 "21 November 2013" "JDK 8" "Basic Tools"
+.\" -----------------------------------------------------------------
+.\" * Define some portability stuff
+.\" -----------------------------------------------------------------
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.\" http://bugs.debian.org/507673
+.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.ie \n(.g .ds Aq \(aq
+.el       .ds Aq '
+.\" -----------------------------------------------------------------
+.\" * set default formatting
+.\" -----------------------------------------------------------------
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.\" -----------------------------------------------------------------
+.\" * MAIN CONTENT STARTS HERE *
+.\" -----------------------------------------------------------------
+
+.SH NAME    
+extcheck \- Detects version conflicts between a target Java Archive (JAR) file and currently installed extension JAR files\&.
+.SH SYNOPSIS    
+.sp     
+.nf     
+
+\fBextcheck\fR [\fIoptions\fR] \fItargetfile\&.jar\fR
+.fi     
+.sp     
+.TP     
+\fIoptions\fR
+The command-line options\&. See Options\&.
+.TP     
+\fItargetfile\&.jar\fR
+The target JAR file against which the currently installed extension JAR files are compared to detect version conflicts\&.
+.SH DESCRIPTION    
+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\&.
+.PP
+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\&.
+.PP
+If no conflict is detected, then the return code is 0\&.
+.PP
+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\&.
+.SH OPTIONS    
+.TP
+-verbose
+.br
+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\&.
+.TP
+-J\fIoption\fR
+.br
+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)\&.
+.SH SEE\ ALSO    
+.TP 0.2i    
+\(bu
+jar(1)
+.RE
+.br
+'pl 8.5i
+'bp