Dmg Plugin Bundle

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Flaviano Bada

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Aug 3, 2024, 4:11:11 PM8/3/24
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The code in that tutorial is mostly valid, but is out of date, it sort of stopped working with version 6. You have to change the pom.xml and other bits to update it to make it with later versions of JIRA

Not sure whether you stumbled across the same issue which I ran into, but my mistake was that I took the entry from the Spring Scanner readme without adjusting it accordingly (the entry under build.plugins.plugin.configuration.instructions). It obviously should state:

Since the 1.4.0 release, this plugin also aims to automate OBR (OSGi Bundle Repository) management.It helps manage a local OBR for your local Maven repository, and also supports remote OBRs for bundle distribution.The plug-in automatically computes bundle capabilities and requirements, using a combination of Bindex and Maven metadata.

The BND library underlying the plugin defines instructions to direct its behavior.For this Maven plugin, these instructions are issued in the plugin configuration section of the POM file, as was illustrated above.BND recognizes three types of instructions:

Variables - Any instruction starting with a lowercase letter is assumed to be a variable in the form of a name-value pair, such as version=3.0, that can be used for property substitution, but is not copied to the manifest.

The instruction is a list of packages for the bundle to export.These packages are copied into the resulting bundle JAR file from the available classes (i.e., project classes, dependencies, and class path);thus, it is possible to include classes into your bundle that are not associated with source files in your project. can be specified with package patterns using the '*' wildcard.Also, it is possible to exclude packages using negation by starting the package pattern with '!'.Thus, non-negated patterns indicate which of the available packages to include in the bundle, whereas negated patterns indicate which should not be included in the bundle.

The list of package patterns is ordered and earlier patterns are applied before later patterns.For example, if you specify "org.foo.,!org.foo.impl" the second pattern has no effect since all org.foo packages have already been selected by the first pattern.Instead, you should specify "!org.foo.impl,org.foo.", which will export all org.foo packages except org.foo.impl.

Following standard OSGi R4 syntax, package patterns can include both directives and attributes, which will be copied appropriately into the generated Export-Package manifest header.Besides explicitly listing package version attributes, BND will also determine package versions by examining the source JAR file or from packageinfo files in the package directory.

The instruction is similar in every way to the instruction, except for the fact that these packages will not be exported by the bundle.If a package is selected by both the export and private package headers, then the export takes precedence.

For the instruction, actual file paths are relative to the pom.xml, while file copy destinations are relative to the root of the resulting bundle JAR file.In the case of assignment or simple forms, the PATH parameter can point to a file or directory.The simple form will place the resource in the bundle JAR with only the file name, i.e., without any path component.For example, including src/main/resources/a/b.c will result in a resource b.c in the root of the bundle JAR.If the PATH points to a directory, the entire directory hierarchy is copied into the resulting bundle JAR file relative to the specified directory.If a specific resource must be placed into a subdirectory of the bundle jar, then use the assignment form, where the first path is the the destination path (including file name if the resource is a file) and the second path is the resource to copy.The inline form requires a ZIP or JAR file, which will be completely expanded in the bundle JAR.

if artifactId starts with last section of groupId that portion is removed.eg.org.apache.maven:maven-core -> org.apache.maven.core The computed symbolic name is also stored in the $(maven-symbolicname) property in case you want to add attributes or directives to it.

is now assumed to be the set of packages in your local Java sources, excluding the default package '.' and any packages containing 'impl' or 'internal'.(before version 2 of the bundleplugin it was based on the symbolic name)

is assumed to be "*", which imports everything referred to by the bundle content, but not contained in the bundle.Any exported packages are also imported by default, to ensure a consistent class space.

Since the plugin creates bundles for OSGi R4, it hard-codes Bundle-ManifestVersion to be '2'.Additionally, it generates imports for every export to ensure package substitutability, which is very important when working with collaborating services.It is possible to override any of these values (except Bundle-ManifestVersion) just by specifying the desired value in the plugin configuration section of the POM file.

The first step in the process of using the plugin is downloading and installing the latest version of the Maven2 runtime.The latest Maven2 release and instuctions for getting started with Maven2 can be found at the Maven website.

There are two main things to note: (1) the specifier must be "bundle" and (2) the plugin and configuration must be specified (the configuration section is where you will issue instructions to the plugin).

Consider this more real-world example using Felix' Log Service implementation.The Log Service project is comprised of a single package: org.apache.felix.log.impl.It has a dependency on the core OSGi interfaces as well as a dependency on the compendium OSGi interfaces for the specific log service interfaces.The following is its POM file:

Notice that the instruction specifies that the bundle exports the Log Service package, even though this package is not contained in the bundle project.By declaring this, the plugin will copy the Log Service package into the resulting bundle JAR file.This is useful in this case because now the bundle can resolve without having to download the entire compendium bundle.The resulting manifest for the Log Service bundle looks like this (notice how the imports/exports automatically have version information associated with them, which was obtained from packageinfo files in the source packages):

If you want to keep your project packaging type (for example "jar") but would like to add OSGi metadata you can use the manifest goal to generate a bundle manifest.The maven-jar-plugin can then be used to add this manifest to the final artifact.For example:

If you want to use packaging types other than "jar" and "bundle" then you also need to enable support for them in the bundleplugin configuration, for example if you want to use the plugin with WAR files:

`excludeDependencies` comma-separated list of dependency artifactIds to exclude from the classpath passed to Bnd, use "true" to exclude everything.Version 2 of the bundleplugin now supports the same style of filter clauses in excludeDependencies as Embed-Dependency.

The plugin uses the instruction to transform the project dependencies into and clauses, which are then appended to the current set of instructions and passed onto BND.If you want the embedded dependencies to be at the start or middle of or then you can use maven-dependencies, which will automatically expand to the relevant clauses.

If you embed a dependency with , and your or instructions match packages inside the embedded jar, you will see some duplication inside the bundle.This is because the and instructions will result in classes being inlined in the bundle, even though they also exist inside the embedded jar.If you want to export packages from an embedded dependency without such duplication then you can either inline the dependency, or use a new BND instruction called .

It is possible to configure the Maven Bundle Plugin to put the bundle manifest where Eclipse/PDE expects it, and use the Maven Dependency Plugin to arrange for any embedded dependencies to appear in a local directory that matches the Bundle-ClassPath entries.Here is an example POM that does this:

Once in a while you may create a bundle which contains additional classes to the ones compiled from src/main/java, for example when you embed the classes from another jar.This can sometimes cause unforeseen problems in Maven, as it will use the output directory (target/classes) rather than the final bundle, when compiling against projects in the same reactor (ie.the same build).

The easiest way to get around this Maven 'feature' is to unpack the contents of the bundle to the output directory after the packaging step, so the additional classes will be found where Maven expects them.Thankfully there is now an easy option to do this in the bundle-plugin:

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