Reland^2 "Target Java 17"

This reverts commit 91ba6c7e01e03bde6e2f24b6d093603391149ae7.

Reason for revert: Relanding Java 17

Change-Id: I6d0e64bb86b9f4a0f41baa33c3226c6316718456
diff --git a/java/java.go b/java/java.go
index 3b0ad8d..6e428cb 100644
--- a/java/java.go
+++ b/java/java.go
@@ -510,14 +510,8 @@
 		return normalizeJavaVersion(ctx, javaVersion)
 	} else if ctx.Device() {
 		return defaultJavaLanguageVersion(ctx, sdkContext.SdkVersion(ctx))
-	} else if ctx.Config().TargetsJava17() {
-		// Temporary experimental flag to be able to try and build with
-		// java version 17 options.  The flag, if used, just sets Java
-		// 17 as the default version, leaving any components that
-		// target an older version intact.
-		return JAVA_VERSION_17
 	} else {
-		return JAVA_VERSION_11
+		return JAVA_VERSION_17
 	}
 }