NetBeans junit/junit_4 library could not be found

This is caused by that the NetBeans IDE you are using has JUnit installed, but the jar files for JUnit are not in your project compiling classpath. You may do one of the following to fix this problem.

A. Add JUnit to your project classpath

1. Create a new JUnit library which includes the junit.jar and hamcrest-core.jar from JUnit. 
2. Add the JUnit library to your project compile path.

B. Do the following

1. Open <your project>\nbproject\project.properties
2. Search for lines containing "junit"
3. Comment out all these lines: ${libs.junit.classpwth} or ${libs.junit_4.classpath}

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