Export a jsprit maven project to an executable jar

Question

I'm trying to create an executable .jar from a maven project using eclipse mars. The project itself can be found on https://github.com/jsprit/jsprit

So far I have successfully imported jsprit to eclipse as a maven project and I am able to run examples as Java Application.

I haven't yet been very successful at exporting it as an executable jar. Let's say I want to export SimpleExample.java. I have created the .jar but if I try to run jsprit-examples-1.6.2-SNAPSHOT-jar-with-dependencies.jar I get the following error message:

Error: Could not find or load main class jsprit.examples.SimpleExample

The pom.xml which is located under jsprit-examples is following:

<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/xsd/maven-4.0.0.xsd">
<parent>
    <groupId>jsprit</groupId>
    <artifactId>jsprit</artifactId>
    <version>1.6.2-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

<artifactId>jsprit-examples</artifactId>

<build>
    <pluginManagement>
        <plugins>
            <plugin>
                <groupId>org.eclipse.m2e</groupId>
                <artifactId>lifecycle-mapping</artifactId>
                <version>1.0.0</version>
                <configuration>
                    <lifecycleMappingMetadata>
                        <pluginExecutions>
                            <pluginExecution>
                                <pluginExecutionFilter>
                                    <groupId>org.apache.maven.plugins</groupId>
                                    <artifactId>maven-enforcer-plugin</artifactId>
                                    <versionRange>[1.0.0,)</versionRange>
                                    <goals>
                                        <goal>enforce</goal>
                                    </goals>
                                </pluginExecutionFilter>
                                <action>
                                    <ignore/>
                                </action>
                            </pluginExecution>
                        </pluginExecutions>
                    </lifecycleMappingMetadata>
                </configuration>
            </plugin>                
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-assembly-plugin</artifactId>
                <configuration>
                    <archive>
                        <manifest>
                            <mainClass>jsprit.examples.SimpleExample</mainClass>
                        </manifest>
                    </archive>
                    <descriptors>
                        <descriptor>src/main/resources/assemblies/jar-with-dependencies.xml</descriptor>
                    </descriptors>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>java</goal>
                        </goals>
                    </execution>
                 </executions>
            </plugin>
        </plugins>
    </pluginManagement>
</build>

<repositories>
    <repository>
        <id>jsprit-snapshots</id>
        <url>https://github.com/jsprit/mvn-rep/raw/master/snapshots</url>
    </repository>
</repositories>

<dependencies>
    <dependency>
        <groupId>${project.groupId}</groupId>
        <artifactId>jsprit-instances</artifactId>
        <version>${project.version}</version>
    </dependency>

    <dependency>
        <groupId>${project.groupId}</groupId>
        <artifactId>jsprit-core</artifactId>
        <version>${project.version}</version>
    </dependency>

    <dependency>
        <groupId>${project.groupId}</groupId>
        <artifactId>jsprit-analysis</artifactId>
        <version>${project.version}</version>
    </dependency>
</dependencies>

Everything else is as same as in the github repository. I ran 'Maven Build...' on jsprit-examples. Under 'Edit Configuration->Goals' I did 'clean package assembly:single'.

This is my first experience with a maven build so it might be a very simple problem to someone who has some experience with maven.

Thanks!

Answer 1

I you want to put all the dependencies in one executable jar, you need to create an uber-jar. I usually do this with the maven shade plugin .