Gradle:

- default is now Java 8 toolchain (to fix Eclipse project import)
- `src/main/module-info` and `src/main/java9` are compiled with Java 11 toolchain (if global toolchain is Java 8)
- `src/main/module-info` and `src/main/java9` are no longer imported into Eclipse projects
- task `errorprone` now uses at least Java 11 toolchain

flatlaf-demo/build.gradle.kts

@@ -43,15 +43,13 @@ tasks {
 		dependsOn( ":flatlaf-intellij-themes:jar" )
 //		dependsOn( ":flatlaf-natives-jna:jar" )
 
-		manifest {
-			attributes( "Main-Class" to "com.formdev.flatlaf.demo.FlatLafDemo" )
-
-			if( java.toolchain.languageVersion.get().asInt() >= 9 )
-				attributes( "Multi-Release" to "true" )
+		manifest.attributes(
+			"Main-Class" to "com.formdev.flatlaf.demo.FlatLafDemo",
+			"Multi-Release" to "true",
 
 			// allow loading FlatLaf native library in Java 24+ (see https://openjdk.org/jeps/472)
-			attributes( "Enable-Native-Access" to "ALL-UNNAMED" )
-		}
+			"Enable-Native-Access" to "ALL-UNNAMED",
+		)
 
 		exclude( "module-info.class" )
 		exclude( "META-INF/versions/*/module-info.class" )