Maven - class not found exception

Question

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>

What Maven command line are you using to build and run this project? — declension
– declension, Commented Feb 15, 2015 at 13:41
I am using eclipse. Right Click project -> Run as Maven build -> Goals= exec:java — jxs145
– jxs145, Commented Feb 15, 2015 at 13:42
Right, you need to build it (within Maven) first. Try goals of "install exec:java" — declension
– declension, Commented Feb 15, 2015 at 13:43
Thanks for that, it is now working! Post it as an answer and I will accept — jxs145
– jxs145, Commented Feb 15, 2015 at 13:47

declension · Accepted Answer · 2015-02-15 13:57:08Z

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.

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