findemptyclasses.md

Find empty classes

org.openrewrite.java.search.FindEmptyClasses

Find empty classes without annotations that do not implement an interface or extend a class.

Tags

• RSPEC-2094

Source

GitHub, Issue Tracker, Maven Central

• groupId: org.openrewrite
• artifactId: rewrite-java
• version: 8.1.3

Example

{% tabs %} {% tab title="IsEmpty.java" %}

Before

{% code title="IsEmpty.java" %}

class IsEmpty {
}

{% endcode %}

After

{% code title="IsEmpty.java" %}

/*~~>*/class IsEmpty {
}

{% endcode %}

{% endtab %} {% tab title="Diff" %} {% code %}

--- IsEmpty.java
+++ IsEmpty.java
@@ -1,1 +1,1 @@
-class IsEmpty {
+/*~~>*/class IsEmpty {
}

{% endcode %} {% endtab %} {% endtabs %}

Usage

This recipe has no required configuration parameters and comes from a rewrite core library. It can be activated directly without adding any dependencies. {% tabs %} {% tab title="Gradle" %} {% code title="build.gradle" %}

plugins {
    id("org.openrewrite.rewrite") version("6.1.4")
}

rewrite {
    activeRecipe("org.openrewrite.java.search.FindEmptyClasses")
}

repositories {
    mavenCentral()
}

{% endcode %} {% endtab %} {% tab title="Maven POM" %} {% code title="pom.xml" %}

<project>
  <build>
    <plugins>
      <plugin>
        <groupId>org.openrewrite.maven</groupId>
        <artifactId>rewrite-maven-plugin</artifactId>
        <version>5.2.4</version>
        <configuration>
          <activeRecipes>
            <recipe>org.openrewrite.java.search.FindEmptyClasses</recipe>
          </activeRecipes>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

{% endcode %} {% endtab %}

{% tab title="Maven Command Line" %} You will need to have Maven installed on your machine before you can run the following command. {% code title="shell" %}

mvn -U org.openrewrite.maven:rewrite-maven-plugin:run \
  -Drewrite.activeRecipes=org.openrewrite.java.search.FindEmptyClasses

{% endcode %} {% endtab %} {% endtabs %}

Contributors

• traceyyoshima
• Jonathan Schnéider

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