oldExtension.setArtifactId(extension.getArtifactId());
        oldExtension.setVersion(extension.getVersion());
        if (extension.getClassLoadingStrategy() != null) {
            oldExtension.setClassLoadingStrategy(extension.getClassLoadingStrategy());
        }
        this.extension = oldExtension;
    }

    public CoreExtension getExtension() {
        return extension;
    }

                    .endTag(NAMESPACE, "version");
        }
        if ((coreExtension.getClassLoadingStrategy() != null)
                && !coreExtension.getClassLoadingStrategy().equals("self-first")) {
            serializer
                    .startTag(NAMESPACE, "classLoadingStrategy")
                    .text(coreExtension.getClassLoadingStrategy())
                    .endTag(NAMESPACE, "classLoadingStrategy");
        }

     * extension) or 'plugin' (follows the rules from extensions
     * defined as plugins).
     *
     * @return String
     */
    public String getClassLoadingStrategy() {
        return this.classLoadingStrategy;
    } // -- String getClassLoadingStrategy()

    /**
     * Get the group ID of the extension's artifact.
     *
     * @return String
     */
    public String getGroupId() {