Description

Checks that a javadoc block tag appears only at the beginning of a line, ignoring leading asterisks and white space. A block tag is a token that starts with @ symbol and is preceded by a whitespace. This check ignores block tags in comments and inside inline tags {@code } and {@literal }.

Rationale: according to the specification all javadoc block tags should be placed at the beginning of a line. Tags that are not placed at the beginning are treated as plain text. To recognize intentional tag placement to text area it is better to escape the @ symbol, and all non-escaped tags should be located at the beginning of the line. See NOTE section for details on how to escape.

Notes

To place a tag explicitly as text, escape the @ symbol with HTML entity @ or place it inside {@code }, for example:

/**
 * @serial literal in {@code @serial} Javadoc tag.
 */
        

Properties

Examples

To configure the default check:

<module name="Checker">
  <module name="TreeWalker">
    <module name="JavadocBlockTagLocation"/>
  </module>
</module>
        

Example:

/**
 * Escaped tag @version (OK)
 * Plain text with {@code @see} (OK)
 * A @custom tag (OK)
 *
 */
        

To configure the check to verify tags from JEP 8068562 only:

<module name="Checker">
  <module name="TreeWalker">
    <module name="JavadocBlockTagLocation">
      <property name="tags" value="apiNote, implSpec, implNote"/>
    </module>
  </module>
</module>
        

To configure the check to verify all default tags and some custom tags in addition:

<module name="Checker">
  <module name="TreeWalker">
    <module name="JavadocBlockTagLocation">
      <!-- default tags -->
      <property name="tags" value="author, deprecated, exception, hidden"/>
      <property name="tags" value="param, provides, return, see, serial"/>
      <property name="tags" value="serialData, serialField, since, throws"/>
      <property name="tags" value="uses, version"/>
      <!-- additional tags used in the project -->
      <property name="tags" value="noinspection"/>
    </module>
  </module>
</module>
        

Example of Usage

• Checkstyle Style

Violation Messages

• javadoc.blockTagLocation
• javadoc.missed.html.close
• javadoc.parse.rule.error
• javadoc.unclosedHtml
• javadoc.wrong.singleton.html.tag

All messages can be customized if the default message doesn't suit you. Please see the documentation to learn how to.

Package

com.puppycrawl.tools.checkstyle.checks.javadoc

Parent Module

TreeWalker