我想使用Google Reflections从我的Maven插件中扫描已编译项目中的类。但默认情况下,插件不会看到项目的已编译类。从Maven 3 documentation开始,我读到了:
需要从项目的compile / runtime / test类路径加载类的插件需要与mojo注释@requiresDependencyResolution一起创建自定义URLClassLoader。
至少可以说有点模糊。基本上我需要一个加载已编译项目类的类加载器的引用。我怎么做到的?
编辑:
好的,@Mojo
注释具有requiresDependencyResolution
参数,因此很容易但仍需要正确的方法来构建类加载器。
答案 0 :(得分:10)
@Component
private MavenProject project;
@SuppressWarnings("unchecked")
@Override
public void execute() throws MojoExecutionException {
List<String> classpathElements = null;
try {
classpathElements = project.getCompileClasspathElements();
List<URL> projectClasspathList = new ArrayList<URL>();
for (String element : classpathElements) {
try {
projectClasspathList.add(new File(element).toURI().toURL());
} catch (MalformedURLException e) {
throw new MojoExecutionException(element + " is an invalid classpath element", e);
}
}
URLClassLoader loader = new URLClassLoader(projectClasspathList.toArray(new URL[0]));
// ... and now you can pass the above classloader to Reflections
} catch (ClassNotFoundException e) {
throw new MojoExecutionException(e.getMessage());
} catch (DependencyResolutionRequiredException e) {
new MojoExecutionException("Dependency resolution failed", e);
}
}