Jar在罐子里用Maven构建

Question

I am trying to create a .jar for my app. This app contains many things such as another .jar.

Using this plugin in my pom configuration :

            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <configuration>
                    <archive>
                        <manifest>
                            <mainClass>com.rilent.App</mainClass>
                        </manifest>
                    </archive>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>
            </plugin>

And I have this link to a local jar

    ...
    <dependency>
        <groupId>it.sauronsoftware.jave</groupId>
        <artifactId>jave</artifactId>
        <version>1.0</version>
        <scope>system</scope>
        <systemPath>${project.basedir}/src/main/resources/jave-1.0.2.jar</systemPath>
    </dependency>

I am using this command to build my app which returns BUILD SUCCESS :

 mvn clean compile assembly:single

but when I try to execute my program, It crashes at some point returning this error :

Exception in thread "main" java.lang.NoClassDefFoundError: it/sauronsoftware/jave/InputFormatException
( a class from the .jar)

I tried decompressing my main jar to see its content :

what is wrong with the way I am creating my jar?

edit @Thorbjørn Ravn Andersen

I tried this way too, I added this to my pom :

<!-- https://mvnrepository.com/artifact/com.jolira/onejar-maven-plugin -->
<dependency>
    <groupId>com.jolira</groupId>
    <artifactId>onejar-maven-plugin</artifactId>
    <version>1.4.4</version>
</dependency>

then I m compiling with mvn compile and when I try to run the .jar I get this error

no main manifest attribute, in .\\myapp-0.0.1-SNAPSHOT.jar what am I doing wrong again ...?

Note : My jar also contains a .exe

Answer 1

The standard classloaders cannot load classes from jars inside jars. EXE files cannot be run from inside jars.

This does not mean that it is impossible, but a bit cumbersome and perhaps above your current skill level. You might find One Jar ( http://one-jar.sourceforge.net/ ) interesting as it automates exactly this.

For a Maven project I have had good experience with creating a deployment structure and scripts with appassembler. http://www.mojohaus.org/appassembler/appassembler-maven-plugin/