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    24 .\"     Arch: generic

    25 .\"     Software: JDK 8

    26 .\"     Date: 21 November 2013

    27 .\"     SectDesc: Basic Tools

    28 .\"     Title: extcheck.1

    29 .\"

    30 .if n .pl 99999

    31 .TH extcheck 1 "21 November 2013" "JDK 8" "Basic Tools"

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    49 .\" * MAIN CONTENT STARTS HERE *

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    51 

    52 .SH NAME    

    53 extcheck \- Detects version conflicts between a target Java Archive (JAR) file and currently installed extension JAR files\&.

    54 .SH SYNOPSIS    

    55 .sp     

    56 .nf     

    57 

    58 \fBextcheck\fR [\fIoptions\fR] \fItargetfile\&.jar\fR

    59 .fi     

    60 .sp     

    61 .TP     

    62 \fIoptions\fR

    63 The command-line options\&. See Options\&.

    64 .TP     

    65 \fItargetfile\&.jar\fR

    66 The target JAR file against which the currently installed extension JAR files are compared to detect version conflicts\&.

    67 .SH DESCRIPTION    

    68 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\&.

    69 .PP

    70 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\&.

    71 .PP

    72 If no conflict is detected, then the return code is 0\&.

    73 .PP

    74 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\&.

    75 .SH OPTIONS    

    76 .TP

    77 -verbose

    78 .br

    79 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\&.

    80 .TP

    81 -J\fIoption\fR

    82 .br

    83 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)\&.

    84 .SH SEE\ ALSO    

    85 .TP 0.2i    

    86 \(bu

    87 jar(1)

    88 .RE

    89 .br

    90 'pl 8.5i

    91 'bp