<module name="TreeWalker">
        <!-- Blocks -->
        <module name="EmptyBlock">
            <property name="option" value="statement"/>
            <property name="tokens" value="LITERAL_DO,LITERAL_ELSE,LITERAL_FINALLY,LITERAL_IF,LITERAL_FOR,LITERAL_TRY,LITERAL_WHILE,INSTANCE_INIT,STATIC_INIT"/>
        </module>
        <module name="EmptyBlock">
            <property name="option" value="text"/>

      <option name="BLOCK_COMMENT_AT_FIRST_COLUMN" value="false" />
      <option name="KEEP_FIRST_COLUMN_COMMENT" value="false" />
      <option name="KEEP_BLANK_LINES_BEFORE_RBRACE" value="0" />
      <option name="ELSE_ON_NEW_LINE" value="true" />
      <option name="WHILE_ON_NEW_LINE" value="true" />
      <option name="CATCH_ON_NEW_LINE" value="true" />
      <option name="FINALLY_ON_NEW_LINE" value="true" />

              <!-- was only a workaround for Plexus Container, hopefully never used by anyone else -->
              <exclude>org.apache.maven.plugin.DefaultBuildPluginManager#setMojoExecutionListeners(java.util.List)</exclude>
              <!-- could have never been used due to usage of non-export class (CoreExportsProvider) -->

            } else if (!(USER_LEVEL.equals(sourceLevel) || GLOBAL_LEVEL.equals(sourceLevel))) {
                throw new IllegalArgumentException("sourceLevel must be one of: {" + USER_LEVEL + "," + GLOBAL_LEVEL + "}");
            } else {
                this.sourceLevel = sourceLevel;
                this.sourceLevelSet = true;
            }

    /**
     * @see java.lang.Object#equals(java.lang.Object)
     */
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        } else if (!(o instanceof Extension)) {
            return false;
        } else {
            Extension e = (Extension) o;
            return java.util.Objects.equals(e.getArtifactId(), getArtifactId())

      </plugin>
      <plugin>
        <artifactId>maven-javadoc-plugin</artifactId>
        <configuration>
          <!-- Passing `-subpackages com.google.common` breaks things, so we explicitly exclude everything else instead. -->
          <!-- excludePackageNames requires specification of packages separately from "all subpackages".
               https://issues.apache.org/jira/browse/MJAVADOC-584 -->
          <excludePackageNames>

<setting id="org.eclipse.jdt.core.formatter.insert_space_after_closing_angle_bracket_in_type_arguments" value="insert"/>
<setting id="org.eclipse.jdt.core.formatter.keep_else_statement_on_same_line" value="false"/>
<setting id="org.eclipse.jdt.core.formatter.alignment_for_binary_expression" value="16"/>

      </plugin>
      <plugin>
        <artifactId>maven-javadoc-plugin</artifactId>
        <configuration>
          <!-- Passing `-subpackages com.google.common` breaks things, so we explicitly exclude everything else instead. -->
          <!-- excludePackageNames requires specification of packages separately from "all subpackages".
               https://issues.apache.org/jira/browse/MJAVADOC-584 -->
          <excludePackageNames>

        } else if (!(USER_LEVEL.equals(sourceLevel) || PROJECT_LEVEL.equals(sourceLevel)  || GLOBAL_LEVEL.equals(sourceLevel))) {
            throw new IllegalArgumentException("sourceLevel must be one of: {" + USER_LEVEL + "," + PROJECT_LEVEL + "," + GLOBAL_LEVEL + "}");
        } else {
            this.sourceLevel = sourceLevel;
            this.sourceLevelSet = true;