return str == null ? EMPTY : str;
    }

    /**
     * 引数の文字列を返します。引数の文字列が<code>null</code>だったら<code>defaultStr</code>を返します。
     * <p>
     * 次のように使います．
     * </p>
     *
     * <pre>
     * StringUtil.defaultString(null, "NULL")  = "NULL"
     * StringUtil.defaultString("", "NULL")    = ""
     * StringUtil.defaultString("aaa", "NULL") = "aaa"

        this.groupId = (groupId != null && !groupId.isEmpty()) ? groupId : null;
        this.artifactId = (artifactId != null && !artifactId.isEmpty()) ? artifactId : null;
        this.classifier = (classifier != null && !classifier.isEmpty()) ? classifier : null;
        this.extension = (extension != null && !extension.isEmpty()) ? extension : null;

    protected void assertObjectNotNull(String variableName, Object value) {
        if (variableName == null) {
            String msg = "The value should not be null: variableName=null value=" + value;
            throw new IllegalArgumentException(msg);
        }
        if (value == null) {
            String msg = "The value should not be null: variableName=" + variableName;
            throw new IllegalArgumentException(msg);
        }

                null, null, null))
        .addEqualityGroup(
            Tables.<String, @Nullable Object, @Nullable Object>immutableCell("bar", null, null))
        .addEqualityGroup(
            Tables.<@Nullable Object, Integer, @Nullable Object>immutableCell(null, 2, null))
        .addEqualityGroup(
            Tables.<@Nullable Object, @Nullable Object, Character>immutableCell(null, null, 'b'))

        assertArgumentNotNull("loader", loader);

        if (path == null || loader == null) {
            return null;
        }
        final String p = getResourcePath(path, extension);
        return loader.getResource(p);
    }

    /**
     * コンテキストクラスローダからリソースを検索してストリームとして返します。
     *
     * @param path
     *            リソースのパス。{@literal null}や空文字列であってはいけません
     * @return ストリーム

          <goal>process</goal>
        </goals>
      </execution>
    </executions>
  </plugin>
  .
  .
  .
</plugins>

     *
     * @param message The detail message, may be {@code null}.
     * @param groupId The group id of the unresolvable model, may be {@code null}.
     * @param artifactId The artifact id of the unresolvable model, may be {@code null}.
     * @param version The version of the unresolvable model, may be {@code null}.
     * @param cause The cause, may be {@code null}.
     */
    public UnresolvableModelException(

     * @param algorithms  The checksum algorithms to use, must not be {@code null}.
     * @return The calculated checksums, indexed by algorithms, never {@code null}.
     * @throws NullPointerException if passed in any parameter is {@code null}.
     * @throws IOException In case of any IO problem.
     */
    @Nonnull

        doUpdate(entity, null);
    }

    public void insertOrUpdate(FavoriteLog entity) {
        doInsertOrUpdate(entity, null, null);
    }

    public void insertOrUpdate(FavoriteLog entity, RequestOptionCall<IndexRequestBuilder> opLambda) {
        entity.asDocMeta().indexOption(opLambda);
        doInsertOrUpdate(entity, null, null);
    }

    public void delete(FavoriteLog entity) {

        doUpdate(entity, null);
    }

    public void insertOrUpdate(Role entity) {
        doInsertOrUpdate(entity, null, null);
    }

    public void insertOrUpdate(Role entity, RequestOptionCall<IndexRequestBuilder> opLambda) {
        entity.asDocMeta().indexOption(opLambda);
        doInsertOrUpdate(entity, null, null);
    }

    public void delete(Role entity) {