[Solved]-Eclipse maven project package disorder-eclipse

the code line
package main.java.helloworld;
in the helloworld project results in this package hierarchy:

main
`-+ java
  `-+ helloworld

is that really what you mean?
in a maven project, you have this directory structure:

src
`-+ main
|   `-+ java
|   |   `-+ <here your packages and classes>
|   '-+ resources
|
'-+ test
|   `-+ java
|   |   `-+ <here your test packages and classes>
|   '-+ resources

src/main/java (production code) and src/test/java (tests only) are the root of your package hierarchy. if you create the nested packages com.enterprise within test/java and create a class test within enterprise, then you have to insert this package declaration in test.java:
package com.enterprise;

take a look at your directory and package structure in the helloworld project.