getExecutions().add(execution);
    } // -- void addExecution( Execution )

    /**
     * Get configuration to pass to all goals run in this phase.
     *
     * @return Object
     */
    public Object getConfiguration() {
        return this.configuration;
    } // -- Object getConfiguration()

    /**
     * Method getExecutions.
     *
     * @return List
     */

            } else {
                index.put(key, plugin);
            }

            Set<String> executionIds = new HashSet<>();

            for (PluginExecution exec : plugin.getExecutions()) {
                if (!executionIds.add(exec.getId())) {
                    addViolation(
                            problems,
                            Severity.ERROR,
                            Version.V20,