CODEWITHSUNDEEP
javalinuxmavencommand-lineexecution
zakaria35
zakaria35

Reputation: 1077

Run Java Maven project with Linux command line

I have a Java project that prints "Hello world !". It runs well under Eclipse/Windows and on a Linux server with the command:

java MyClass.java; javac MyClass

Now that I have converted the project to a Maven project it's still running fine in Eclipse, but I can't find how to run it with a Linux command. I tried many answers that I found on forums but none work for me.

Here is an example of what I tested:

mvn package install;
cd target;
java -cp myApp-0.0.1-SNAPSHOT.jar mypackage.Mylass;

This results to an error: 

Error: Could not find or load main class mypackage.Mylass

So, how can I run the Maven code on Linux without generating a jar file or at least make it work with a command line?

Upvotes: 4

Views: 19395

Answers (3)

Fernando.
Fernando.

Reputation: 763

You've specify a main class in the manifest of myApp-0.0.1-SNAPSHOT.jar

Add the next snippet of code to your pom file.

<build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <archive>
                        <manifest>
                            <mainClass>mypackage.Mylass</mainClass>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>
        </plugins>
    </build>

This's the complete pom.file

http://maven.apache.org/maven-v4_0_0.xsd"> 4.0.0 com.mycompany.app my-app jar 1.0-SNAPSHOT my-app http://maven.apache.org junit junit 3.8.1 test 

    <dependency>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.6.1</version>
    </dependency>

</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <configuration>
                <archive>
                    <manifest>
                        <mainClass>com.mycompany.app.App</mainClass>
                    </manifest>
                </archive>
            </configuration>
        </plugin>
    </plugins>
</build>

Upvotes: 2

zakaria35
zakaria35

Reputation: 1077

i finally managed to make it work thanks to all the answers.
here is what i did
i moved my Main class to the outside of packages and deleted/regenerated a new POM file with 

<manifest>
   <mainClass>Myclass</mainClass>
</manifest>

but i got some dependency errors so i generated a jar file with the dependency by adding maven plugin jar-with-dependencies so here is what the build part of my POM file looks like now 

....
</dependencyManagement>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
  <plugin>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.0</version>
    <configuration>
      <source>1.7</source>
      <target>1.7</target>
    </configuration>
  </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <configuration>
                <archive>
                    <manifest>
                        <mainClass>MyClass</mainClass>
                    </manifest>
                </archive>
            </configuration>
        </plugin>

        <plugin>
        <artifactId>maven-assembly-plugin</artifactId>
        <version>3.0.0</version>
        <configuration>
            <descriptorRefs>
                <descriptorRef>jar-with-dependencies</descriptorRef>
            </descriptorRefs>
            <archive>
                <manifest>
                    <mainClass>MyClass</mainClass>
                </manifest>
            </archive>
        </configuration>
        <executions>
            <execution>
                <id>make-assembly</id> <!-- this is used for inheritance merges -->
                <phase>package</phase> <!-- bind to the packaging phase -->
                <goals>
                    <goal>single</goal>
                </goals>
            </execution>
        </executions>
    </plugin>
</plugins>
</build>

and here is how i execute it . 

rm -rf target/ #delete old generated files
mvn install package  # generate new jar files
java -jar target/App-0.0.1-SNAPSHOT-jar-with-dependencies.jar  # execution

i hope this can save someone else's time
thanks for your help

Upvotes: 6

Midhun
Midhun

Reputation: 146

Can you confirm the class name you can trying to run ? As per your comment, originally ran the class using below command.

java MyClass.java; javac MyClass - here the class name is MyClass

After maven install, it should be invoked using 

mvn package install;
cd target;
java -cp myApp-0.0.1-SNAPSHOT.jar mypackage.MyClass;

Upvotes: 1

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