Java – Maven exec plug-in classnotfoundexception

I am using the Maven exec plug-in to run a Java application from the command line. The command is MVN exec: Java I'm already in POM XML specifies the main class and related dependencies

<groupId>com.example.MyApp</groupId>
<artifactId>MyApp</artifactId>
<version>1.0.0</version>
<build>
  <plugins>
     <plugin>
       <groupId>org.codehaus.mojo</groupId>
       <artifactId>exec-maven-plugin</artifactId>
       <version>1.2.1</version>
       <executions>
         <execution>
           <goals>
             <goal>java</goal>
          </goals>
         </execution>
       </executions>
       <configuration>
          <mainClass>com.example.myclass</mainClass>
          <arguments>
            <argument>configFile</argument>
            <argument>properties</argument>
          </arguments>
       </configuration>
     </plugin>

I also specified some dependencies

<dependencies>
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.17</version>
    <type>jar</type>
</dependency>
<dependency>
    <groupId>com.example.MyLibrary</groupId>
    <artifactId>MyLibrary</artifactId>
    <version>1.0.0</version>
</dependency>

The myapp program reads a configuration file, which is passed in as a command line parameter The configuration file contains the name of the class located in MyLibrary So this class can be com mypackage. driver. MyClass, located in MyLibrary, is a dependency of myapp jar listed above However, when I try to run it, I get a classnotfoundexception

- - update the class I'm using the system class loader to load the class passed in from the command line of the myapp program

ClassLoader loader = ClassLoader.getSystemClassLoader();

I think this is causing problems because it is looking for classes that do not contain dependencies on the default classpath

What did I do wrong here?

Solution

Are you still looking for the answer to this question? I had exactly the same question and finally figured it out

You need to add includeplugindependencies in the configuration to enable the plug-in to search for dependencies of the main class:

<configuration>
  <includePluginDependencies>true</includePluginDependencies>
  <mainClass>com.example.myclass</mainClass>
  <arguments>
    <argument>configFile</argument>
    <argument>properties</argument>
  </arguments>
</configuration>

See: http://mojo.codehaus.org/exec-maven-plugin/java-mojo.html#includePluginDependencies