Improve LicenseHeader default regex for Java

lib/src/main/java/com/diffplug/spotless/generic/LicenseHeaderStep.java

@@ -45,6 +45,7 @@
 
 /** Prefixes a license header before the package statement. */
 public final class LicenseHeaderStep {
+	public static final String DEFAULT_JAVA_HEADER_DELIMITER = "(package|import|public|class|module) ";
 	private static final Logger LOGGER = LoggerFactory.getLogger(LicenseHeaderStep.class);
 
 	public enum YearMode {

plugin-gradle/CHANGES.md

@@ -3,6 +3,7 @@
 We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (starting after version `3.27.0`).
 
 ## [Unreleased]
+* `licenseHeader` default pattern for Java files is updated to `(package|import|public|class|module) `. ([#1614](https://github.com/diffplug/spotless/pull/1614))
 
 ## [6.16.0] - 2023-02-27
 ### Added

plugin-gradle/src/main/java/com/diffplug/gradle/spotless/JavaExtension.java

@@ -50,9 +50,7 @@ public JavaExtension(SpotlessExtension spotless) {
 		super(spotless);
 	}
 
-	// If this constant changes, don't forget to change the similarly-named one in
-	// testlib/src/test/java/com/diffplug/spotless/generic/LicenseHeaderStepTest.java as well
-	static final String LICENSE_HEADER_DELIMITER = "package ";
+	static final String LICENSE_HEADER_DELIMITER = LicenseHeaderStep.DEFAULT_JAVA_HEADER_DELIMITER;
 
 	@Override
 	public LicenseHeaderConfig licenseHeader(String licenseHeader) {

plugin-maven/CHANGES.md

@@ -3,6 +3,8 @@
 We adhere to the [keepachangelog](https://keepachangelog.com/en/1.0.0/) format (starting after version `1.27.0`).
 
 ## [Unreleased]
+### Fixed
+* `licenseHeader` default pattern for Java files is updated to `(package|import|public|class|module) `. ([#1614](https://github.com/diffplug/spotless/pull/1614))
 
 ## [2.34.0] - 2023-02-27
 ### Added

plugin-maven/src/main/java/com/diffplug/spotless/maven/groovy/Groovy.java

@@ -20,6 +20,7 @@
 import org.apache.maven.project.MavenProject;
 
 import com.diffplug.common.collect.ImmutableSet;
+import com.diffplug.spotless.generic.LicenseHeaderStep;
 import com.diffplug.spotless.maven.FormatterFactory;
 import com.diffplug.spotless.maven.generic.LicenseHeader;
 
@@ -32,7 +33,7 @@
 public class Groovy extends FormatterFactory {
 
 	private static final Set<String> DEFAULT_INCLUDES = ImmutableSet.of("src/main/groovy/**/*.groovy", "src/test/groovy/**/*.groovy");
-	private static final String LICENSE_HEADER_DELIMITER = "package ";
+	private static final String LICENSE_HEADER_DELIMITER = LicenseHeaderStep.DEFAULT_JAVA_HEADER_DELIMITER;
 
 	@Override
 	public Set<String> defaultIncludes(MavenProject project) {

plugin-maven/src/main/java/com/diffplug/spotless/maven/java/Java.java

@@ -26,6 +26,7 @@
 import org.apache.maven.model.Build;
 import org.apache.maven.project.MavenProject;
 
+import com.diffplug.spotless.generic.LicenseHeaderStep;
 import com.diffplug.spotless.maven.FormatterFactory;
 import com.diffplug.spotless.maven.generic.LicenseHeader;
 
@@ -37,7 +38,7 @@
  */
 public class Java extends FormatterFactory {
 
-	private static final String LICENSE_HEADER_DELIMITER = "package ";
+	private static final String LICENSE_HEADER_DELIMITER = LicenseHeaderStep.DEFAULT_JAVA_HEADER_DELIMITER;
 
 	@Override
 	public Set<String> defaultIncludes(MavenProject project) {

plugin-maven/src/main/java/com/diffplug/spotless/maven/scala/Scala.java

@@ -20,6 +20,7 @@
 import org.apache.maven.project.MavenProject;
 
 import com.diffplug.common.collect.ImmutableSet;
+import com.diffplug.spotless.generic.LicenseHeaderStep;
 import com.diffplug.spotless.maven.FormatterFactory;
 import com.diffplug.spotless.maven.generic.LicenseHeader;
 
@@ -33,7 +34,7 @@ public class Scala extends FormatterFactory {
 
 	private static final Set<String> DEFAULT_INCLUDES = ImmutableSet.of("src/main/scala/**/*.scala",
 			"src/test/scala/**/*.scala", "src/main/scala/**/*.sc", "src/test/scala/**/*.sc");
-	private static final String LICENSE_HEADER_DELIMITER = "package ";
+	private static final String LICENSE_HEADER_DELIMITER = LicenseHeaderStep.DEFAULT_JAVA_HEADER_DELIMITER;
 
 	@Override
 	public Set<String> defaultIncludes(MavenProject project) {

testlib/src/main/resources/license/HelloWorld_java.test

@@ -0,0 +1,5 @@
+public class HelloWorld {
+	public static void main(String[] args) {
+		System.out.print("Hello World");
+	}
+}

testlib/src/main/resources/license/HelloWorld_withImport_java.test

@@ -0,0 +1,7 @@
+import java.time.LocalDate;
+
+public class HelloWorld {
+	public static void main(String[] args) {
+		System.out.print("Hello World. Date: " + LocalDate.now());
+	}
+}

testlib/src/main/resources/license/module-info.test

@@ -0,0 +1,5 @@
+module java.sql {
+   exports java.sql;
+   exports javax.sql;
+   exports javax.transaction.xa;
+}

testlib/src/test/java/com/diffplug/spotless/generic/LicenseHeaderStepTest.java

@@ -32,7 +32,7 @@
 
 class LicenseHeaderStepTest extends ResourceHarness {
 	private static final String FILE_NO_LICENSE = "license/FileWithoutLicenseHeader.test";
-	private static final String package_ = "package ";
+	private static final String package_ = LicenseHeaderStep.DEFAULT_JAVA_HEADER_DELIMITER;
 	private static final String HEADER_WITH_$YEAR = "This is a fake license, $YEAR. ACME corp.";
 	private static final String HEADER_WITH_RANGE_TO_$YEAR = "This is a fake license with range, 2009-$YEAR. ACME corp.";
 
@@ -250,4 +250,22 @@ void should_preserve_year_for_license_with_address() throws Throwable {
 				hasHeader(licenceWithAddress().replace("$YEAR", "2015").replace("FooBar Inc. All", "FooBar Inc.  All")),
 				hasHeader(licenceWithAddress().replace("$YEAR", "2015")));
 	}
+
+	@Test
+	void noPackage() throws Throwable {
+		String header = header(getTestResource("license/TestLicense"));
+		FormatterStep step = LicenseHeaderStep.headerDelimiter(header, package_).build();
+		StepHarness.forStep(step)
+				.test(ResourceHarness.getTestResource("license/HelloWorld_java.test"), header + ResourceHarness.getTestResource("license/HelloWorld_java.test"))
+				.test(ResourceHarness.getTestResource("license/HelloWorld_withImport_java.test"), header + ResourceHarness.getTestResource("license/HelloWorld_withImport_java.test"));
+	}
+
+	// The following demonstrate the use of 'module' keyword
+	@Test
+	void moduleInfo() throws Throwable {
+		String header = header(getTestResource("license/TestLicense"));
+		FormatterStep step = LicenseHeaderStep.headerDelimiter(header, package_).build();
+		StepHarness.forStep(step)
+				.test(ResourceHarness.getTestResource("license/module-info.test"), header + ResourceHarness.getTestResource("license/module-info.test"));
+	}
 }