not able to runn dependency main function

Question

I am having two java projects, animal project and animal-test project. In animal project I am having an annotation interface called Animal like as shown below

Animal.java

package com.animal;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface Animal{
    String name();
}

Along with this I am having an interface MakeSound.java which has a method called makesSound().

Now I have build and created animal jar file including the dependencies, then I have imported animal.jar in my Second Project animal-test. I create a class called AnimalTest.java I now build and create a jar file animal-test.jar and when I run the jar file like java -jar animal-test.jar I got the following exception

no main manifest attribute, in animal-test.jar

Can anyone please help me on this.

Looks like the main class attribute is not present in the `META-INF/MANIFEST.MF` Can you check if the entry `Main-Class: com.animal.AnimalFinder` is present in the MANIFEST.MF file in the jar? — Jerin Joseph, Jun 14 '17 at 16:44
@JerinJoseph I am importing both jars, `animal-1.0.jar` and `animal-1.0-jar-with-dependencies.jar`. In `animal-1.0.jar` nothing is there but in `animal-1.0-jar-with-dependencies.jar` I have `Main-Class: com.animal.AnimalFinder` — Alex Man, Jun 14 '17 at 16:49
You would need the manifest in the animal test jar too. Check my answer. — Jerin Joseph, Jun 14 '17 at 16:51
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/146686/discussion-between-alex-man-and-jerin-joseph). — Alex Man, Jun 14 '17 at 16:52
@JerinJoseph I got two jars `animal-1.0.jar` and `animal-1.0-jar-with-dependencies.jar`. When I run `java -jar animal-1.0-jar-with-dependencies.jar` I got `Error: Could not find or load main class com.animal.AnimalFinder` — Alex Man, Jun 14 '17 at 16:55
Basically, you would need the `META-INF/MANIFEST.MF` with the `Main-Class: com.animal.AnimalFinder` in the jar file you are trying to run. So, you would just need to add the plugin to the pom.xml which builds the jar. — Jerin Joseph, Jun 14 '17 at 16:57
As you've added the `animal-1.0.jar` as a local dependency. The classes under `animal-1.0.jar` will not be present inside `animal-1.0-jar-with-dependencies.jar`. Hence it is not able to find the `com.animal.AnimalFinder` — Jerin Joseph, Jun 14 '17 at 16:59
You need to add the `animal-1.0.jar` to the class path when you run. — Jerin Joseph, Jun 14 '17 at 17:00
@JerinJoseph When I run `java -cp animal-1.0.jar -jar animal-test.jar` I got `no main manifest attribute, in animal-1.0.jar` — Alex Man, Jun 14 '17 at 17:03

score 2 · Accepted Answer · answered Jun 14 '17 at 16:48

You need to add the plugin to create the MANIFEST file in the pom.xml for animal-test too.

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-assembly-plugin</artifactId>
            <version>2.4.1</version>
            <configuration>
                <descriptorRefs>
                    <descriptorRef>jar-with-dependencies</descriptorRef>
                </descriptorRefs>
                <archive>
                    <manifest>
                        <mainClass>com.animal.AnimalFinder</mainClass>
                    </manifest>
                </archive>
            </configuration>
            <executions>
                <execution>
                    <id>make-assembly</id>
                    <phase>package</phase>
                    <goals>
                        <goal>single</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

I got two jars `animal-1.0.jar` and `animal-1.0-jar-with-dependencies.jar`. When I run `java -jar animal-1.0-jar-with-dependencies.jar` I got `Error: Could not find or load main class com.animal.AnimalFinder` — Alex Man, Jun 14 '17 at 16:57
Can you please help me on this https://stackoverflow.com/questions/44582091/one-jar-with-one-class-and-main-class-from-dependecy-jar — Alex Man, Jun 16 '17 at 14:36

not able to runn dependency main function

1 Answers1