Handling possible errors

Here are some possible errors you could run into when following the steps we previously outlined, along with some solutions:

1. Error during compilation:

      javac: invalid flag: --module-source-path 

This is probably because you haven't switched to JDK 9 and are still using the Java 8 compiler. The --module-source-path option has been newly introduced to  javac as of version 9.

2. Error during compilation:

      error: module not found: packt.addressbook 

This error is because the Java compiler is unable to find the module-info.java file. Make sure it is in the right directory path.

3. Error during runtime:

      Error occurred during initialization of VM 
      java.lang.module.ResolutionException: Module packt.addressbook
      not found 

This error indicates that the module file is not available in the module path provided. Make sure the path...