How do I get a Java maven build to fail for compiler warnings?

Question

I am trying:

        
            org.apache.maven.plugins
            maven-compiler-plugin&l         


        

Answer 1

Update for the year 2015, using Maven 3.3 and Java 8.

Here's a minimal compiler configuration that enables all warnings and makes the build fail whenever warnings occur.

    
        maven-compiler-plugin
        3.3
        
            1.8
            1.8
            true
            
                -Xlint:all
                -Werror
            
        
    

Bits of note:

• true is required. For reasons unknown, Maven by default actively suppresses warnings with the -nowarn flag, so the -Xlint and -Werror flags would be ignored.
• showDeprecation doesn't need to be enabled because -Xlint:all already emits deprecation warnings.
• Experimentation shows that fork doesn't need to be enabled, even though the documentation says otherwise.