Creating executable JAR with Maven Shade plugin - maven

Question

I am having trouble making an executable jar from a simple Java program.
I followed these Maven instructions and modified my pom.xml:
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>1.7</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer implementation=
"org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>package.MyClass</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
When executing the install goal, I can read the line:
[INFO] Replacing /home/project-1.0.0.jar with /home/project-1.0.0-shaded.jar
But all I can find at that location is the project-1.0.0.jar, actually containing the dependencies -and having the right size- but when trying to execute it with my jre, it says:
The file '/home/project-1.0.0.jar' is not marked as executable.
Thus nothing gets executing!
How can I get my jar to execute properly?
Thanks for helping!

Answer 1

Given is the pom.xml to create an executable jar file
<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>org.executablejar</groupId>
<artifactId>demo</artifactId>
<packaging>jar</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>demo Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<java-version>1.8</java-version>
<docker.image.prefix>springDemo</docker.image.prefix>
</properties>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.3.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
<finalName>demo</finalName>
</build>

Answer 2

I have a simple solution with the assembly plugin. This solution will make a jar (target/${project.groupdId}-${project.artifactId}-${project.version}.jar):
containing all the required dependencies
that is executable (via java -jar *.jar)
Declare in you pom file:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<appendAssemblyId>false</appendAssemblyId>
<archive>
<manifest>
<mainClass>package.MyClass</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-executable-jar</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
I hope I helped you!
Cheers !