CODEWITHSUNDEEP
maven
jxs145
jxs145

Reputation: 15

Maven - class not found exception

I am trying to build my maven project, however I am getting the following exception:

java.lang.ClassNotFoundException: com.example.message.Main
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:281)
at java.lang.Thread.run(Thread.java:745)

My POM file is below. I have ensured that the package name is included within the <mainClass> tag. But it stil cannot find the class?

<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>com.example</groupId>
  <artifactId>message</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <build>
<plugins>
  <plugin>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.1</version>
    <configuration>
      <source>1.8</source>
      <target>1.8</target>
    </configuration>
  </plugin>
  <plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>exec-maven-plugin</artifactId>
    <version>1.3.2</version>
    <executions>
      <execution>
        <goals>
          <goal>java</goal>
        </goals>
      </execution>
    </executions>
    <configuration>
      <mainClass>com.example.message.Main</mainClass>
      <arguments>
        <argument>AddTrial</argument>
      </arguments>
    </configuration>
  </plugin>
</plugins>
  </build>
  <dependencies>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-core</artifactId>
    <version>4.3.8.Final</version>
</dependency>
<dependency>
    <groupId>postgresql</groupId>
    <artifactId>postgresql</artifactId>
    <version>9.1-901-1.jdbc4</version>
</dependency>
  </dependencies>
</project>

Upvotes: 1

Views: 5079

Answers (1)

declension
declension

Reputation: 4185

You need to make sure you're building a Maven project before running any plugin goals that rely on the compiled classes being available (like exec:java).

In this case, it should be as simple as running 

mvn install exec:java

or the equivalent goals from your IDE.

Upvotes: 4

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