Question

I used the maven assembly package to create a single monolithic jar. Included is the datanucleus package, but I am getting errors because I did not maintain the OSGI structure (plugins.xml & META-INF/META-INF.MD). The answers on stackoverflow([question]: Datanucleus, JDO and executable jar – how to do it?) do not provide answers on how to create the single deployable jar.

Does anyone know what maven directives I can use to ensure OSGI structure?

Answer 1

So, the problem is that packing everything into a monolithic jar is that the OSGI structures get overritten by the OSGI structure of other jars. The benefit of the monolithic jar was to have a single file to push to the server but not necessary (since I was using capistrano to push to the server)

Instead, it’s easier to just copy the jars into the final build directory. Heroku’s Java setup has a perfect example of this:

https://devcenter.heroku.com/articles/java

<?xml version="1.0" encoding="UTF-8"?>
<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.example</groupId>
<version>1.0-SNAPSHOT</version>
<artifactId>helloworld</artifactId>
<dependencies>
    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-servlet</artifactId>
        <version>7.6.0.v20120127</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
    </dependency>
</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <version>2.4</version>
            <executions>
                <execution>
                    <id>copy-dependencies</id>
                    <phase>package</phase>
                    <goals><goal>copy-dependencies</goal></goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>
</project>