Maven java compile error can not access CommonClassA

Question

Background:

• I am developing Maven multi module project.
• One of the module is common module needed by other all modules.
• This module contain CommonClassA.java.
• common module is properly compiled.
• It is installed into maven local repository properly.
• One of the class(Billtype.java) in other module (EmployeeBilling) refers this class(CommonClassA.java).
• Maven Dependency for common module is properly specified in pom.xml of EmployeeBilling module.

Problem:

While compiling EmployeeBilling module it throws

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project EmployeeBilling: Compilation failure
[ERROR] \MyWorkspace\Biz\EmployeeBilling\src\main\java\com\employee\Billtype.java:[79,19] error: cannot access CommonClassA
[ERROR] -> [Help 1]**

Supporting details:

• dependency defined in EmployeeBilling> pom.xml:

• Other classes from common module seems accessible as no error observed

• There are no other errors like Class not found/file not found.
• The class CommonCLassA implements Serializable
• Same error occurs from Eclipse as well as commond line
• I am using M2E plugin

Tools:

• jdk1.7.0_02
• OS: Windows 7
• Eclipse JUNO and apache-maven-3.1.0

Thanks in advance!

Answer 1

With no more information it's hard to find the cause. But I also had this problems now and then, and there are some things which could go wrong:

• Are you using the right JAVA version (everywhere) ?
• ... and the right java PROVIDER? (Oracle, IBM, OpenJDK) In my case it's often this issue, I'm sometimes bound to IBM JDK, although I try to use Oracle where I can and this sometimes breaks my build.
• Is the right maven dependency VERSION used? If you depend on it multiple times, and all in the same (lower than root) dept of dependencies, Maven will just "choose" a version. It could be that thát version is incompatible with your code of thát particular dependency
• Skipping tests sometimes WORKS! It has something to do with maven phases and getting stuff ready for using it elsewhere.

Good luck :)