javalangapis.md

Use modernized java.lang APIs

org.openrewrite.java.migrate.lang.JavaLangAPIs

Certain Java lang APIs have become deprecated and their usages changed, necessitating usage changes.

Source

GitHub, Issue Tracker, Maven Central

• groupId: org.openrewrite.recipe
• artifactId: rewrite-migrate-java
• version: 2.0.1

Examples

Example 1

{% tabs %} {% tab title="com/abc/A.java" %}

Before

{% code title="com/abc/A.java" %}

package com.abc;

class A {
   public void test() {
       boolean result = Character.isJavaLetter('b');
   }
}

{% endcode %}

After

{% code title="com/abc/A.java" %}

package com.abc;

class A {
   public void test() {
       boolean result = Character.isJavaIdentifierStart('b');
   }
}

{% endcode %}

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

--- com/abc/A.java
+++ com/abc/A.java
@@ -5,1 +5,1 @@
class A {
   public void test() {
-      boolean result = Character.isJavaLetter('b');
+      boolean result = Character.isJavaIdentifierStart('b');
   }

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

---

Example 2

{% tabs %} {% tab title="com/abc/A.java" %}

Before

{% code title="com/abc/A.java" %}

package com.abc;

class A {
   public void test() {
       boolean result = Character.isJavaLetter('b');
   }
}

{% endcode %}

After

{% code title="com/abc/A.java" %}

package com.abc;

class A {
   public void test() {
       boolean result = Character.isJavaIdentifierStart('b');
   }
}

{% endcode %}

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

--- com/abc/A.java
+++ com/abc/A.java
@@ -5,1 +5,1 @@
class A {
   public void test() {
-      boolean result = Character.isJavaLetter('b');
+      boolean result = Character.isJavaIdentifierStart('b');
   }

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

Usage

This recipe has no required configuration options. It can be activated by adding a dependency on org.openrewrite.recipe:rewrite-migrate-java:2.0.1 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.java.migrate.lang.JavaLangAPIs")
}

repositories {
    mavenCentral()
}

dependencies {
    rewrite("org.openrewrite.recipe:rewrite-migrate-java:2.0.1")
}

{% 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.java.migrate.lang.JavaLangAPIs</recipe>
          </activeRecipes>
        </configuration>
        <dependencies>
          <dependency>
            <groupId>org.openrewrite.recipe</groupId>
            <artifactId>rewrite-migrate-java</artifactId>
            <version>2.0.1</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-migrate-java:RELEASE \
  -Drewrite.activeRecipes=org.openrewrite.java.migrate.lang.JavaLangAPIs

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

Definition

{% tabs %} {% tab title="Recipe List" %}

• Use Character#isJavaIdentifierStart(char)
• Use Character#isJavaIdentifierPart(char)
• Use Character#isWhitespace(char)
• Use Runtime.Version#feature()
• Use Runtime.Version#interim()
• Use Runtime.Version#update()
• Use SecurityManager#checkMulticast(InetAddress)
• Use ClassLoader#defineClass(String, byte[], int, int)
• Use Class#getDeclaredConstructor().newInstance()

{% endtab %}

{% tab title="Yaml Recipe List" %}

---
type: specs.openrewrite.org/v1beta/recipe
name: org.openrewrite.java.migrate.lang.JavaLangAPIs
displayName: Use modernized `java.lang` APIs
description: Certain Java lang APIs have become deprecated and their usages changed, necessitating usage changes.
recipeList:
  - org.openrewrite.java.migrate.lang.MigrateCharacterIsJavaLetterToIsJavaIdentifierStart
  - org.openrewrite.java.migrate.lang.MigrateCharacterIsJavaLetterOrDigitToIsJavaIdentifierPart
  - org.openrewrite.java.migrate.lang.MigrateCharacterIsSpaceToIsWhitespace
  - org.openrewrite.java.migrate.lang.MigrateRuntimeVersionMajorToFeature
  - org.openrewrite.java.migrate.lang.MigrateRuntimeVersionMinorToInterim
  - org.openrewrite.java.migrate.lang.MigrateRuntimeVersionSecurityToUpdate
  - org.openrewrite.java.migrate.lang.MigrateSecurityManagerMulticast
  - org.openrewrite.java.migrate.lang.MigrateClassLoaderDefineClass
  - org.openrewrite.java.migrate.lang.MigrateClassNewInstanceToGetDeclaredConstructorNewInstance

{% endtab %} {% endtabs %}

Contributors

• traceyyoshima
• Patrick
• Tyler Van Gorder
• Sam Snyder
• Jonathan Schnéider
• Knut Wannheden
• Aaron Gershman
• Josh Soref
• Aaron Gershman

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