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I have been trying to get jar using Maven Shade Plugin, but I still don't get a success.

This is my project structure:

MainModule -Module1 -src -pom.xml -Module2 -src -pom.xml -pom.xml

Module1 (pom.xml):

<parent> <artifactId>MainModule</artifactId> <groupId>com.plugintest</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>Module1</artifactId>

Module2 (pom.xml):

<parent> <artifactId>MainModule</artifactId> <groupId>com.plugintest</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>Module1</artifactId>

MainModule (pom.xml):

<groupId>com.plugintest</groupId> <artifactId>MainModule</artifactId> <packaging>pom</packaging> <version>1.0-SNAPSHOT</version> <modules> <module>Module1</module> <module>Module2</module> </modules> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-shade-plugin</artifactId> <version>2.2</version> <executions> <execution> <phase>package</phase> <goals> <goal>shade</goal> </goals> </execution> </executions> </plugin> </plugins> </build>

According this code I get 2 jar-files (Module1-version.jar and Module2-version.jar). But it is not what I want. I wish to get 1 jar file (MainModule-version.jar), which would contain the other (Module1 and Module2).

Why doesn't this Shade Plugin work?

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  • Your Module2 is labeled "Module1" in the code snippets above. ... Commented Jan 16, 2015 at 0:41

1 Answer 1

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You MainModule is not supposed to produce a jar file. It can produce only... pom files. It contains configuration shared across all it child modules. This is why the shade plugin is called against each modules.

Instead, create a third module. Let's call it FinalModule. This module is a child of MainModule. Move the whole <build> node from MainModule pom.xml to FinalModule pom.xml.

File structure:

 MainModule -FinalModule -src -pom.xml -Module1 -src -pom.xml -Module2 -src -pom.xml -pom.xml

The FinalModule pom.xml looks like this:

FinalModule (pom.xml)

<parent> <groupId>com.plugintest</groupId> <artifactId>MainModule</artifactId> <version>1.0-SNAPSHOT</version> </parent> <artifactId>FinalModule</artifactId> <dependencies> <dependency> <groupId>com.plugintest</groupId> <artifactId>Module1</artifactId> <version>1.0-SNAPSHOT</version> </dependency> <dependency> <groupId>com.plugintest</groupId> <artifactId>Module2</artifactId> <version>1.0-SNAPSHOT</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-shade-plugin</artifactId> <version>2.2</version> <executions> <execution> <phase>package</phase> <goals> <goal>shade</goal> </goals> </execution> </executions> </plugin> </plugins> </build>

In the end, you should get something like this:

[INFO] [INFO] --- maven-jar-plugin:2.3.2:jar (default-jar) @ FinalModule --- [INFO] Building jar: D:\workspaces\java\Parent\FinalModule\target\FinalModule-1.0-SNAPSHOT.jar [INFO] [INFO] --- maven-shade-plugin:2.2:shade (default) @ FinalModule --- [INFO] Including my:Module1:jar:1.0-SNAPSHOT in the shaded jar. [INFO] Including my:Module2:jar:1.0-SNAPSHOT in the shaded jar. [INFO] Replacing original artifact with shaded artifact. [INFO] Replacing D:\workspaces\java\Parent\FinalModule\target\FinalModule-1.0-SNAPSHOT.jar with D:\workspaces\java\Parent\FinalModule\target\FinalModule-1.0-SNAPSHOT-shaded.jar [INFO] Dependency-reduced POM written at: D:\workspaces\java\Parent\FinalModule\dependency-reduced-pom.xml [INFO] ------------------------------------------------------------------------ [INFO] Reactor Summary: [INFO] [INFO] Parent ............................................ SUCCESS [0.016s] [INFO] Module1 ........................................... SUCCESS [1.654s] [INFO] Module2 ........................................... SUCCESS [0.343s] [INFO] FinalModule ....................................... SUCCESS [0.953s] [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------
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1 Comment

I take back my previous comments...I was confused/frustrated because I thought this approach requires using <parent> pom links. Thankfully, it doesn't; even without them, the module containing the shade config will output the shaded jar when you run mvn install on the aggregation pom.

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