} catch (NoClassDefFoundError e) {
            mojoExecutionListener.afterExecutionFailure(
                    new MojoExecutionEvent(session, project, mojoExecution, mojo, e));
            ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
            PrintStream ps = new PrintStream(os);
            ps.println(
                    "A required class was missing while executing " + mojoDescriptor.getId() + ": " + e.getMessage());

                cause = cause.getCause();
            }

            if ((cause instanceof NoClassDefFoundError) || (cause instanceof ClassNotFoundException)) {
                ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
                PrintStream ps = new PrintStream(os);
                ps.println("Unable to load the mojo '" + mojoDescriptor.getGoal() + "' in the plugin '"