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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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