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.\"     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"

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.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

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