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- Maven - creating a Jar from contents of another Jar file
Posted by : Unknown
Sunday, January 2, 2011
Recently I came across a situation where I had to create a jar file with similar contents as of some other available jar. As using maven we cannot copy one jar file within another and also I didn't want to reinvent the wheel again so here is how I achieved the same.
Let's say there is an artifact 'sandeep-ejb-client' (some client ejb jar which has some dependency on some other artifacts say log4j and junit)
What I am interested is in creating a new jar file that has all the ejb client classes without including dependencies of 'sandeep-ejb-client'.
Here is the POM file to achieve the same:
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.test.gognamunish</groupId>
<artifactId>Test</artifactId>
<version>1_0_0</version>
<name>Test JAR</name>
<packaging>jar</packaging>
<build>
<plugins>
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>${project.artifactId}-fetch-deps</id>
<phase>generate-sources</phase>
<goals>
<goal>unpack-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.outputDirectory}</outputDirectory>
<stripVersion>true</stripVersion>
<excludeTransitive>true</excludeTransitive>
<excludeArtifactIds>log4j,junit</excludeArtifactIds>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>com.ejb.sandeepkadyan</groupId>
<artifactId>sandeep-ejb-client</artifactId>
<version>1_0_0</version>
</dependency>
</dependencies>
</project>
That's All, Simple? If anyone has got better approach please feel free to discuss !!!
- Munish
are you trying to create a fat artifact. If yes, try this.
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<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<appendAssemblyId>true</appendAssemblyId>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>assembly</goal>
</goals>
</execution>
</executions>
</plugin>
]]>
Is there a way that we can copy the contents of a jar to target without extracting that jar. For example: I have an asset.jar that weigh around 500MB and I need to copy only one folder from it, to my project target. Can this be achieved without unpacking the jar, becoz unpacking is taking a lot of time....
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