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Blueprint Developer Manual / Version 2310

Table Of Contents Packaging Types

By default, Maven provides you with several packaging types. The most important ones are the pom, jar and the war type. They should be sufficient for the most common kinds of development modules but whenever you try to either support proprietary formats or try to break whole new ground, those three packaging types aren't sufficient. Using only the pom packaging type together with custom executions of arbitrary plugins, gives you flexibility but adding and maintaining your pom.xml files is going to be a complex and costly process.

To reduce complexity, but even more important to enforce standards, CoreMedia came up with a custom tailored packaging type for the CoreMedia Blueprint workspace. The coremedia-application packaging type provides a build lifecycle and dependency profile for a proprietary application format.


The coremedia-application packaging type is provided by the coremedia-application-maven-plugin. When you take a look at the root pom.xml file and search for this plugin, you will find two occurrences, one in the pluginManagement section and one in the build section. The latter definition contains the line <extensions>true</extensions> within its plugin body, telling Maven that it extends Maven functionality. In this case, Maven will register the custom lifecycle bound to the custom packaging type.


Besides lifecycle, a custom packaging type can also influence if Maven dependencies of this type have transitive dependencies or not. Because CoreMedia wanted to keep the coremedia-application packaging type to be the pendant of the war packaging type, it does not have transitive dependencies either. For your modules to depend on other coremedia-application modules and their dependencies as well, this means, that you need to define an additional dependency to the same GAV (groupId, artifactId, version) coordinates but with packaging type pom.


Example 4.1. Dependencies for a CoreMedia application

You may know this pattern from working with war overlays if they are skinny too, which means that they contain no further versioned artifacts.

For further information about the coremedia-application-maven-plugin, you should visit the plugins documentation site at CoreMedia Application Plugin.

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