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A.4. Wrap URL Handler

Overview
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If you need to reference a JAR file that is not already packaged as a bundle, you can use the Wrap URL handler to convert it dynamically. The implementation of the Wrap URL handler is based on Peter Krien's open source Bnd utility.

Syntax
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A Wrap URL has the following syntax: 
wrap:locationURL[,instructionsURL][$instructions]
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The locationURL can be any URL that locates a JAR (where the referenced JAR is not formatted as a bundle). The optional instructionsURL references a Bnd properties file that specifies how the bundle conversion is performed. The optional instructions is an ampersand, &, delimited list of Bnd properties that specify how the bundle conversion is performed.

Default instructions
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In most cases, the default Bnd instructions are adequate for wrapping an API JAR file. By default, Wrap adds manifest headers to the JAR's META-INF/Manifest.mf file as shown in Table A.1, “Default Instructions for Wrapping a JAR”.
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Table A.1. Default Instructions for Wrapping a JAR
Manifest HeaderDefault Value
Import-Package*;resolution:=optional
Export-PackageAll packages from the wrapped JAR.
Bundle-SymbolicNameThe name of the JAR file, where any characters not in the set [a-zA-Z0-9_-] are replaced by underscore, _.

Examples
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The following Wrap URL locates version 1.1 of the commons-logging JAR in a Maven repository and converts it to an OSGi bundle using the default Bnd properties: 
wrap:mvn:commons-logging/commons-logging/1.1
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The following Wrap URL uses the Bnd properties from the file, E:\Data\Examples\commons-logging-1.1.bnd: 
wrap:mvn:commons-logging/commons-logging/1.1,file:E:/Data/Examples/commons-logging-1.1.bnd
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The following Wrap URL specifies the Bundle-SymbolicName property and the Bundle-Version property explicitly: 
wrap:mvn:commons-logging/commons-logging/1.1$Bundle-SymbolicName=apache-comm-log&Bundle-Version=1.1
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If the preceding URL is used as a command-line argument, it might be necessary to escape the dollar sign, \$, to prevent it from being processed by the command line, as follows: 
wrap:mvn:commons-logging/commons-logging/1.1\$Bundle-SymbolicName=apache-comm-log&Bundle-Version=1.1
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Reference
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For more details about the wrap URL handler, see the following references:
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