Why are Maven generated-sources not getting compil

Question

This question already has answers here:

maven can't add files in generated-sources for compilation phase (2 answers)

Closed 2 years ago.

I have a plugin which generates sources under the target/generated-sources/wrappers directory. It's wired into the generate-sources phase like this:

<plugin>
    <groupId>mygroupid</groupId>
    <artifactId>myartifactid</artifactId>
    <executions>
        <execution>
        <phase>generate-sources</phase>
        <goals>
            <goal>xml2java</goal>
        </goals>
        </execution>
    </executions>
</plugin>

The problem is, when I use mvn deploy the .class files won't be placed in the jar. I see all the .java files there, but no .class.

I read all the issues around this problem, but couldn't figure out how to solve the problem. I'm using Maven 3.0.x.

Answer 1

The build-helper plugin indeed solved the problem. Thanks @Joe for the comment.

<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>build-helper-maven-plugin</artifactId>
    <executions>
        <execution>
            <phase>generate-sources</phase>
            <goals>
                <goal>add-source</goal>
            </goals>
            <configuration>
                <sources>
                    <source>${project.build.directory}/generated-sources/wrappers</source>
                </sources>
            </configuration>
        </execution>
    </executions>
</plugin>

Answer 2

If you have written the plugin by yourself you can programatically add the path with the generated sources to the maven source paths.

@Mojo(name = "generate")
public class MyCodegenMojo extends AbstractMojo {
    @Parameter(defaultValue = "${project}")
    private MavenProject project;

    @Override
    public void execute() throws MojoExecutionException, MojoFailureException{
        // your generator code

        project.addCompileSourceRoot("path/to/your/generated/sources");
    }

}

For example the raml-jaxrs-codegen plugin uses this technique. See RamlJaxrsCodegenMojo.java for more details.