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21 .\" or visit www.oracle.com if you need additional information or have any |
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22 .\" questions. |
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24 .\" Arch: generic |
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25 .\" Software: JDK 8 |
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26 .\" Date: 21 November 2013 |
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27 .\" SectDesc: Basic Tools |
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28 .\" Title: extcheck.1 |
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29 .\" |
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30 .if n .pl 99999 |
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31 .TH extcheck 1 "21 November 2013" "JDK 8" "Basic Tools" |
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32 .\" ----------------------------------------------------------------- |
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47 .ad l |
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48 .\" ----------------------------------------------------------------- |
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49 .\" * MAIN CONTENT STARTS HERE * |
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50 .\" ----------------------------------------------------------------- |
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51 |
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52 .SH NAME |
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53 extcheck \- Detects version conflicts between a target Java Archive (JAR) file and currently installed extension JAR files\&. |
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54 .SH SYNOPSIS |
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55 .sp |
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56 .nf |
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57 |
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58 \fBextcheck\fR [\fIoptions\fR] \fItargetfile\&.jar\fR |
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59 .fi |
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60 .sp |
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61 .TP |
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62 \fIoptions\fR |
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63 The command-line options\&. See Options\&. |
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64 .TP |
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65 \fItargetfile\&.jar\fR |
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66 The target JAR file against which the currently installed extension JAR files are compared to detect version conflicts\&. |
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67 .SH DESCRIPTION |
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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\&. |
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69 .PP |
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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\&. |
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71 .PP |
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72 If no conflict is detected, then the return code is 0\&. |
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73 .PP |
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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\&. |
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75 .SH OPTIONS |
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76 .TP |
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77 -verbose |
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78 .br |
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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\&. |
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80 .TP |
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81 -J\fIoption\fR |
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82 .br |
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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)\&. |
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84 .SH SEE\ ALSO |
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85 .TP 0.2i |
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86 \(bu |
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87 jar(1) |
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88 .RE |
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89 .br |
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90 'pl 8.5i |
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91 'bp |
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