java.lang.NoClassDefFoundError: in eclipse maven

Question

In eclipse with maven, I have add a dependency as a local jar file, as like this:

<dependency>
    <groupId>xyz-core</groupId>
    <artifactId>xyz-core</artifactId>
    <version>0</version>
    <scope>system</scope>
    <systemPath>/home/xyz/xyz-core.jar</systemPath>
</dependency>

In this jar file I have a interface that is using in my application.

When I run my application on tomcat server It show exception for that interface

Exception sending context initialized event to listener instance of class
org.springframework.web.context.ContextLoaderListener
java.lang.NoClassDefFoundError: com/mxgraph/canvas/mxICanvas2D

while mxICanvas2D is a interface.

Answer 1

This is most likely because you have set the scope to system. According to the Maven documentation:

system

This scope is similar to provided except that you have to provide the JAR which contains it explicitly. The artifact is always available and is not looked up in a repository.

In other words, the dependency is not put on your classpath when you run your application if you use system; you have to do that yourself.

Use one of the other scopes, for example compile.

Answer 2

Have you added "Maven Dependencies" to the project's "Web Deployment Assembly". If not, add that as follows:

Right Click on your project -> Properties -> Deployment Assembly -> Add -> Java Build Path Entries -> Next and then from there you can add "maven Dependencies". Then build and try to run your app.