explicitinitialization.md

Explicit initialization

org.openrewrite.staticanalysis.ExplicitInitialization

_Checks if any class or object member is explicitly initialized to default for its type value:

• null for object references
• zero for numeric types and char
• and false for boolean Removes explicit initializations where they aren't necessary._

Tags

• RSPEC-3052

Source

GitHub, Issue Tracker, Maven Central

• groupId: org.openrewrite.recipe
• artifactId: rewrite-static-analysis
• version: 1.0.1

Example

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

Before

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

class Test {
    private int a = 0;
    private long b = 0L;
    private short c = 0;
    private int d = 1;
    private long e = 2L;
    private int f;
    private char g = '\0';

    private boolean h = false;
    private boolean i = true;

    private Object j = new Object();
    private Object k = null;

    int[] l = null;
    int[] m = new int[0];

    private final Long n = null;
}

{% endcode %}

After

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

class Test {
    private int a;
    private long b;
    private short c;
    private int d = 1;
    private long e = 2L;
    private int f;
    private char g;

    private boolean h;
    private boolean i = true;

    private Object j = new Object();
    private Object k;

    int[] l;
    int[] m = new int[0];

    private final Long n = null;
}

{% endcode %}

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

--- Test.java
+++ Test.java
@@ -2,3 +2,3 @@
class Test {
-   private int a = 0;
-   private long b = 0L;
-   private short c = 0;
+   private int a;
+   private long b;
+   private short c;
    private int d = 1;
@@ -8,1 +8,1 @@
    private long e = 2L;
    private int f;
-   private char g = '\0';
+   private char g;

@@ -10,1 +10,1 @@
    private char g = '\0';

-   private boolean h = false;
+   private boolean h;
    private boolean i = true;
@@ -14,1 +14,1 @@

    private Object j = new Object();
-   private Object k = null;
+   private Object k;

@@ -16,1 +16,1 @@
    private Object k = null;

-   int[] l = null;
+   int[] l;
    int[] m = new int[0];

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

Usage

This recipe has no required configuration options. It can be activated by adding a dependency on org.openrewrite.recipe:rewrite-static-analysis:1.0.1 in your build file or by running a shell command (in which case no build changes are needed): {% tabs %} {% tab title="Gradle" %} {% code title="build.gradle" %}

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

rewrite {
    activeRecipe("org.openrewrite.staticanalysis.ExplicitInitialization")
}

repositories {
    mavenCentral()
}

dependencies {
    rewrite("org.openrewrite.recipe:rewrite-static-analysis:1.0.1")
}

{% 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.staticanalysis.ExplicitInitialization</recipe>
          </activeRecipes>
        </configuration>
        <dependencies>
          <dependency>
            <groupId>org.openrewrite.recipe</groupId>
            <artifactId>rewrite-static-analysis</artifactId>
            <version>1.0.1</version>
          </dependency>
        </dependencies>
      </plugin>
    </plugins>
  </build>
</project>

{% endcode %} {% endtab %}

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

mvn -U org.openrewrite.maven:rewrite-maven-plugin:run \
  -Drewrite.recipeArtifactCoordinates=org.openrewrite.recipe:rewrite-static-analysis:RELEASE \
  -Drewrite.activeRecipes=org.openrewrite.staticanalysis.ExplicitInitialization

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

Contributors

• Knut Wannheden
• Jonathan Schneider
• Sam Snyder
• Aaron Gershman

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