| '\" t |
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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 |
| 'bp |