1extcheck(1) Basic Tools extcheck(1)
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6 extcheck - Detects version conflicts between a target Java Archive
7 (JAR) file and currently installed extension JAR files.
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10 extcheck [options] targetfile.jar
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13 options
14 The command-line options. See Options.
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16 targetfile.jar
17 The target JAR file against which the currently installed
18 extension JAR files are compared to detect version conflicts.
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21 The extcheck command checks a specified JAR file for title and version
22 conflicts with any extensions installed in the Java SE SDK. Before
23 installing an extension, you can use this utility to see whether the
24 same or a more recent version of the extension is already installed.
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26 The extcheck command compares the Specification-title and
27 Specification-version headers in the manifest of the targetfile.jar
28 file against the corresponding headers in all JAR files currently
29 installed in the extension directory. By default, the extension
30 directory is jre/lib/ext on Oracle Solaris and \jre\lib\ext on Windows.
31 The extcheck command compares version numbers in the same way as the
32 java.lang.Package.isCompatibleWith method.
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34 If no conflict is detected, then the return code is 0.
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36 If the manifest of any JAR file in the extensions directory has the
37 same Specification-title and the same or a newer Specification-version
38 number, then a non-zero error code is returned. A non-zero error code
39 is also returned when targetfile.jar does not have the Specification-
40 title or Specification-version attributes in its manifest file.
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43 -verbose
44 Lists JAR files in the extension directory as they are checked.
45 Additionally, manifest attributes of the target JAR file and any
46 conflicting JAR files are also reported.
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48 -Joption
49 Passes option to the Java Virtual Machine (JVM), where option is
50 one of the options described on the reference page for the Java
51 launcher. For example, -J-Xms48m sets the startup memory to 48
52 MB. See java(1).
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55 ยท jar(1)
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59JDK 8 21 November 2013 extcheck(1)