exec-maven-plugin exec:java failing: Cannot assign configuration values to array of type java.lang.String

I would suggest to remove the empty entries from your configuration and try it again.

 <argument>-classpath</argument>
 <classpath/>

Cause in java goal the classpath is not allowed based on the documentation.

BTW: Never use "\" in your maven pom. Use forward slashes instead.

According to exec:java Docs here, you have to :

Remove <arguments> part

And use <additionalClasspathElements> declarations to define a classpath.

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