assertNotNull(event.getSession());
                assertNotNull(event.getProject());
                assertNotNull(event.getExecution());
                assertNotNull(event.getMojo());
                assertNull(event.getCause());

                log.add("beforeMojoExecution " + event.getProject().getArtifactId() + ":"
                        + event.getExecution().getExecutionId());
            }

                        MojoDescriptor forkedMojoDescriptor;

                        if (goal.indexOf(':') < 0) {
                            forkedMojoDescriptor = pluginDescriptor.getMojo(goal);
                            if (forkedMojoDescriptor == null) {
                                throw new MojoNotFoundException(goal, pluginDescriptor);
                            }
                        } else {

                    InvalidPluginDescriptorException {
        PluginDescriptor pluginDescriptor = getPluginDescriptor(plugin, repositories, session);

        MojoDescriptor mojoDescriptor = pluginDescriptor.getMojo(goal);

        if (mojoDescriptor == null) {
            throw new MojoNotFoundException(goal, pluginDescriptor);
        }

        return mojoDescriptor;
    }

    @Override