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Posted to users@maven.apache.org by Mi...@faa.gov on 2015/08/03 22:45:02 UTC

Problem Executing A Mavan Built Program

I created the source code for a very simple Java program in Eclipse.

Then I ran mvn install to build the program, which worked fine.

The following are the errors I am getting when I try to run the program built by Maven from the command line.  I have included the command prompt errors; the source code and the POM file.  I have also searched extensively for both of the execution time errors I am encountering but have been unable to find any explanation that works, and I've tried several.

Attempt(s) to execute the class file:
H:\EclipseWorkspacesLunaForMaven\SimpleNoLibraryProject\target\classes\main\java\org\prog>java SimpleNoLibraryProgram
Error: Could not find or load main class SimpleNoLibraryProgram

H:\EclipseWorkspacesLunaForMaven\SimpleNoLibraryProject\target\classes\main\java\org\prog>java main.java..org.prog.SimpleNoLibraryProgram
Error: Could not find or load main class main.java..org.prog.SimpleNoLibraryProgram



Attempt to execute the JAR file:
C:\Users\Michael CTR Tarullo.FAA\.m2\program-build-repository\main\java\org\prog\SimpleNoLibraryProgram\1.0>java -jar SimpleNoLibraryProgram-1.0.jar
no main manifest attribute, in SimpleNoLibraryProgram-1.0.jar


Source code:
package main.java.org.prog;

public class SimpleNoLibraryProgram
{
                public static void main(String[] args)
                {
                                System.out.println("Hello Simple No Library Program!!!");
                }
}



POM 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/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>main.java.org.prog</groupId>
  <artifactId>SimpleNoLibraryProgram</artifactId>
  <version>1.0</version>
 <packaging>jar</packaging>

  <name>SimpleNoLibraryProgram</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

Michael Tarullo
Contractor (Engility Corp)
Enterprise Architect
NSRR System Administrator
FAA WJH Technical Center
(609)485-5294

Re: Problem Executing A Mavan Built Program

Posted by Brice Vandeputte <bv...@gmail.com>.
Michael,
 another way is to render your jar file "executable" by adding mainClass
entry to your jar manifest file

 then you will be able to launch your application using

   java -jar yours.jar

 have a look at
https://maven.apache.org/shared/maven-archiver/examples/classpath.html#Make
 -- setup a maven jar build plugin into your pom
 -- configure main class four your generated archive
 regards

2015-08-04 10:26 GMT+02:00 Adrien Rivard <ad...@gmail.com>:

> Hi,
>
> Your packages/directories are not correct:
>
> That should work :
> H:\EclipseWorkspacesLunaForMaven\SimpleNoLibraryProject\target\classes>
> java
> main.java.org.prog.SimpleNoLibraryProgram
> Error: Could not find or load main class
> main.java..org.prog.SimpleNoLibraryProgram
>
> But "main/java" is not supposed to be part of the package name
>
> structure of your project should be
> - [projectDir]/src/main/java/org/prog/SimpleNoLibraryProgram
> - [projectDir]/pom.xml
>
> package of SimpleNoLibraryProgram.java is supposed to be only
> org.prog.SimpleNoLibraryProgram
>
> then you can run mvn package in project dir, and run "java
> org.prog.SimpleNoLibraryProgram" in [projectDir]/target/classes
>
> Note that invoking java on a maven project ike this is only doable for very
> simple projects without dependencies.
>
>
> On Mon, Aug 3, 2015 at 10:45 PM, <Mi...@faa.gov> wrote:
>
> > I created the source code for a very simple Java program in Eclipse.
> >
> > Then I ran mvn install to build the program, which worked fine.
> >
> > The following are the errors I am getting when I try to run the program
> > built by Maven from the command line.  I have included the command prompt
> > errors; the source code and the POM file.  I have also searched
> extensively
> > for both of the execution time errors I am encountering but have been
> > unable to find any explanation that works, and I've tried several.
> >
> > Attempt(s) to execute the class file:
> >
> H:\EclipseWorkspacesLunaForMaven\SimpleNoLibraryProject\target\classes\main\java\org\prog>java
> > SimpleNoLibraryProgram
> > Error: Could not find or load main class SimpleNoLibraryProgram
> >
> >
> H:\EclipseWorkspacesLunaForMaven\SimpleNoLibraryProject\target\classes\main\java\org\prog>java
> > main.java..org.prog.SimpleNoLibraryProgram
> > Error: Could not find or load main class
> > main.java..org.prog.SimpleNoLibraryProgram
> >
> >
> >
> > Attempt to execute the JAR file:
> > C:\Users\Michael CTR
> >
> Tarullo.FAA\.m2\program-build-repository\main\java\org\prog\SimpleNoLibraryProgram\1.0>
> > no main manifest attribute, in SimpleNoLibraryProgram-1.0.jar
> >
> >
> > Source code:
> > package main.java.org.prog;
> >
> > public class SimpleNoLibraryProgram
> > {
> >                 public static void main(String[] args)
> >                 {
> >                                 System.out.println("Hello Simple No
> > Library Program!!!");
> >                 }
> > }
> >
> >
> >
> > POM 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/xsd/maven-4.0.0.xsd">
> >   <modelVersion>4.0.0</modelVersion>
> >
> >   <groupId>main.java.org.prog</groupId>
> >   <artifactId>SimpleNoLibraryProgram</artifactId>
> >   <version>1.0</version>
> >  <packaging>jar</packaging>
> >
> >   <name>SimpleNoLibraryProgram</name>
> >   <url>http://maven.apache.org</url>
> >
> >   <properties>
> >     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
> >   </properties>
> >
> >   <dependencies>
> >     <dependency>
> >       <groupId>junit</groupId>
> >       <artifactId>junit</artifactId>
> >       <version>3.8.1</version>
> >       <scope>test</scope>
> >     </dependency>
> >   </dependencies>
> > </project>
> >
> > Michael Tarullo
> > Contractor (Engility Corp)
> > Enterprise Architect
> > NSRR System Administrator
> > FAA WJH Technical Center
> > (609)485-5294
> >
> >
>
>
> --
> Adrien Rivard
>

Re: Problem Executing A Mavan Built Program

Posted by Adrien Rivard <ad...@gmail.com>.
Hi,

Your packages/directories are not correct:

That should work :
H:\EclipseWorkspacesLunaForMaven\SimpleNoLibraryProject\target\classes> java
main.java.org.prog.SimpleNoLibraryProgram
Error: Could not find or load main class
main.java..org.prog.SimpleNoLibraryProgram

But "main/java" is not supposed to be part of the package name

structure of your project should be
- [projectDir]/src/main/java/org/prog/SimpleNoLibraryProgram
- [projectDir]/pom.xml

package of SimpleNoLibraryProgram.java is supposed to be only
org.prog.SimpleNoLibraryProgram

then you can run mvn package in project dir, and run "java
org.prog.SimpleNoLibraryProgram" in [projectDir]/target/classes

Note that invoking java on a maven project ike this is only doable for very
simple projects without dependencies.


On Mon, Aug 3, 2015 at 10:45 PM, <Mi...@faa.gov> wrote:

> I created the source code for a very simple Java program in Eclipse.
>
> Then I ran mvn install to build the program, which worked fine.
>
> The following are the errors I am getting when I try to run the program
> built by Maven from the command line.  I have included the command prompt
> errors; the source code and the POM file.  I have also searched extensively
> for both of the execution time errors I am encountering but have been
> unable to find any explanation that works, and I've tried several.
>
> Attempt(s) to execute the class file:
> H:\EclipseWorkspacesLunaForMaven\SimpleNoLibraryProject\target\classes\main\java\org\prog>java
> SimpleNoLibraryProgram
> Error: Could not find or load main class SimpleNoLibraryProgram
>
> H:\EclipseWorkspacesLunaForMaven\SimpleNoLibraryProject\target\classes\main\java\org\prog>java
> main.java..org.prog.SimpleNoLibraryProgram
> Error: Could not find or load main class
> main.java..org.prog.SimpleNoLibraryProgram
>
>
>
> Attempt to execute the JAR file:
> C:\Users\Michael CTR
> Tarullo.FAA\.m2\program-build-repository\main\java\org\prog\SimpleNoLibraryProgram\1.0>
> no main manifest attribute, in SimpleNoLibraryProgram-1.0.jar
>
>
> Source code:
> package main.java.org.prog;
>
> public class SimpleNoLibraryProgram
> {
>                 public static void main(String[] args)
>                 {
>                                 System.out.println("Hello Simple No
> Library Program!!!");
>                 }
> }
>
>
>
> POM 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/xsd/maven-4.0.0.xsd">
>   <modelVersion>4.0.0</modelVersion>
>
>   <groupId>main.java.org.prog</groupId>
>   <artifactId>SimpleNoLibraryProgram</artifactId>
>   <version>1.0</version>
>  <packaging>jar</packaging>
>
>   <name>SimpleNoLibraryProgram</name>
>   <url>http://maven.apache.org</url>
>
>   <properties>
>     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
>   </properties>
>
>   <dependencies>
>     <dependency>
>       <groupId>junit</groupId>
>       <artifactId>junit</artifactId>
>       <version>3.8.1</version>
>       <scope>test</scope>
>     </dependency>
>   </dependencies>
> </project>
>
> Michael Tarullo
> Contractor (Engility Corp)
> Enterprise Architect
> NSRR System Administrator
> FAA WJH Technical Center
> (609)485-5294
>
>


-- 
Adrien Rivard