I'm writing a Maven plugin whose job is to delegate to a core module who needs to read files from the project classpath (i.e. the project declaring the plugin as a plugin dependency).
However, from what I understand, Maven plugin comes with its own classpath, thus leading all my Class#getResourceAsStream in my core module calls to returning null.
Is there a way to include the project classpath elements in the plugin one?
OK, the issue was due to a leading slash. Once removed, the following code retrieves the MavenProject instance (you need to add maven-artifact and maven-project to your POM):
public static ClassLoader getClassLoader(MavenProject project) throws DependencyResolutionRequiredException, MalformedURLException {
List<String> classPathElements = compileClassPathElements(project);
List<URL> classpathElementUrls = new ArrayList<>(classPathElements.size());
for (String classPathElement : classPathElements) {
classpathElementUrls.add(new File(classPathElement).toURI().toURL());
}
return new URLClassLoader(
classpathElementUrls.toArray(new URL[classpathElementUrls.size()]),
Thread.currentThread().getContextClassLoader()
);
}
private static List<String> compileClassPathElements(MavenProject project) throws DependencyResolutionRequiredException {
return newArrayList(project.getCompileClasspathElements());
}