Consistently add license header to all java source files

* Add line break after license header to all files, including Kotlin
* Add license header to `package-info.java` files

(cherry picked from commit e373917)

Author: marcphilipp

gradle/config/spotless/eclipse-public-license-2.0.java

@@ -7,3 +7,4 @@
  *
  * https://www.eclipse.org/legal/epl-v20.html
  */
+

gradle/plugins/code-generator/src/main/kotlin/junitbuild/generator/GenerateJreRelatedSourceCode.kt

@@ -60,7 +60,7 @@ abstract class GenerateJreRelatedSourceCode : DefaultTask() {
             val params = mapOf(
                 "jres" to jres,
                 "jresSortedByStringValue" to jres.sortedBy { it.version.toString() },
-                "licenseHeader" to licenseHeaderFile.asFile.get().readText()
+                "licenseHeader" to licenseHeaderFile.asFile.get().readText().trimEnd() + "\n",
             )
             templates.forEach {
                 val targetFile = mainTargetDir.toPath().resolve(it.resolveSibling(it.nameWithoutExtension).path)

gradle/plugins/common/src/main/kotlin/junitbuild.spotless-conventions.gradle.kts

@@ -29,6 +29,7 @@ spotless {
 		val javaFormatterConfigFile = configDir.file("junit-eclipse-formatter-settings.xml")
 
 		java {
+			targetExclude("**/module-info.java", "**/package-info.java")
 			licenseHeaderFile(license.headerFile, "(package|import) ")
 			importOrderFile(importOrderConfigFile)
 			val fullVersion = requiredVersionFromLibs("eclipse")
@@ -39,13 +40,14 @@ spotless {
 			removeUnusedImports()
 		}
 
-		format("moduleDescriptor") {
+		format("moduleAndPackageInfo") {
 			target(fileTree(layout.projectDirectory.dir("src/module")) {
-				include("**/module-info.java")
+				include("**/module-info.java", "**/package-info.java")
 			})
-			licenseHeaderFile(license.headerFile, "^$")
+			licenseHeaderFile(license.headerFile, "((/(//|\\*\\*))|((open )?module )|package|@.+)")
 			trimTrailingWhitespace()
 			endWithNewline()
+			leadingSpacesToTabs()
 		}
 	}
 

platform-tooling-support-tests/platform-tooling-support-tests.gradle.kts

@@ -19,6 +19,9 @@ spotless {
 	java {
 		target(files(project.java.sourceSets.map { it.allJava }), "projects/**/*.java")
 	}
+	format("moduleAndPackageInfo") {
+		target("projects/**/module-info.java", "projects/**/package-info.java")
+	}
 	kotlin {
 		target("projects/**/*.kt")
 	}