Add maven-compiler-plugin version when missing during Java migration (#989)

When maven-compiler-plugin has no <version> tag and uses <source>/<target>,
the migration converts to <release> but the default plugin version (3.1)
doesn't support it. Set addVersionIfMissing on UpgradePluginVersion so a
compatible version is always present.

Author: jkschneider

src/main/resources/META-INF/rewrite/java-version-11.yml

@@ -110,6 +110,7 @@ recipeList:
       groupId: org.apache.maven.plugins
       artifactId: maven-compiler-plugin
       newVersion: 3.6.2
+      addVersionIfMissing: true
   - org.openrewrite.github.SetupJavaUpgradeJavaVersion:
       minimumJavaMajorVersion: 11
   - org.openrewrite.maven.UpgradePluginVersion:

src/main/resources/META-INF/rewrite/java-version-17.yml

@@ -110,6 +110,7 @@ recipeList:
       groupId: org.apache.maven.plugins
       artifactId: maven-compiler-plugin
       newVersion: 3.x
+      addVersionIfMissing: true
   - org.openrewrite.maven.UpgradePluginVersion:
       groupId: org.apache.maven.plugins
       artifactId: maven-war-plugin

src/main/resources/META-INF/rewrite/java-version-25.yml

@@ -207,6 +207,7 @@ recipeList:
       groupId: org.apache.maven.plugins
       artifactId: maven-compiler-plugin
       newVersion: 3.15.x
+      addVersionIfMissing: true
   - org.openrewrite.maven.UpgradePluginVersion:
       groupId: org.apache.maven.plugins
       artifactId: maven-surefire-plugin

src/test/java/org/openrewrite/java/migrate/Java8toJava11Test.java

@@ -70,6 +70,86 @@ void needToJaxb2MavenPlugin() {
         );
     }
 
+    @Test
+    void compilerPluginVersionAddedWhenMissing() {
+        rewriteRun(
+          version(
+            mavenProject("project",
+              //language=xml
+              pomXml(
+                """
+                  <project>
+                    <groupId>com.mycompany.app</groupId>
+                    <artifactId>my-app</artifactId>
+                    <version>1</version>
+                    <build>
+                      <plugins>
+                        <plugin>
+                          <groupId>org.apache.maven.plugins</groupId>
+                          <artifactId>maven-compiler-plugin</artifactId>
+                          <configuration>
+                            <source>1.5</source>
+                            <target>1.5</target>
+                          </configuration>
+                        </plugin>
+                      </plugins>
+                    </build>
+                  </project>
+                  """,
+                spec -> spec.after(pomXml -> {
+                    assertThat(pomXml).contains("<version>3.");
+                    return pomXml;
+                })
+              )
+            ),
+            8)
+        );
+    }
+
+    @Test
+    void compilerPluginVersionAddedAndReleaseSetForFullMigration() {
+        rewriteRun(
+          spec -> spec.recipe(Environment.builder()
+            .scanRuntimeClasspath("org.openrewrite.java.migrate")
+            .build()
+            .activateRecipes("org.openrewrite.java.migrate.Java8toJava11")),
+          version(
+            mavenProject("project",
+              //language=xml
+              pomXml(
+                """
+                  <project>
+                    <groupId>com.mycompany.app</groupId>
+                    <artifactId>my-app</artifactId>
+                    <version>1</version>
+                    <build>
+                      <plugins>
+                        <plugin>
+                          <groupId>org.apache.maven.plugins</groupId>
+                          <artifactId>maven-compiler-plugin</artifactId>
+                          <configuration>
+                            <source>1.5</source>
+                            <target>1.5</target>
+                          </configuration>
+                        </plugin>
+                      </plugins>
+                    </build>
+                  </project>
+                  """,
+                spec -> spec.after(pomXml -> {
+                    assertThat(pomXml)
+                      .contains("<release>11</release>")
+                      .contains("<version>3.")
+                      .doesNotContain("<source>")
+                      .doesNotContain("<target>");
+                    return pomXml;
+                })
+              )
+            ),
+            8)
+        );
+    }
+
     @Test
     void noChangeOnCorrectJaxb2MavenPluginVersion() {
         rewriteRun(