Merge pull request #10348 from eclipse/revert-10329-lookupobj

Revert "Selectively enforce lookup class package check"

jcl/src/java.base/share/classes/java/lang/invoke/MethodHandles.java

@@ -215,23 +215,12 @@ static final public class Lookup {
 			accessMode = lookupMode;
 		}
 
-		/* For Java 15, the default is not to check for the "java.lang.invoke" package.
-		 * For earlier releases, these lookups are illegal
-		  */
-		private static boolean lookupJLIPackageCheckDefault() {
-			/*[IF Java15]
-			return false;
-			/*[ELSE] Java15*/
-			return true;
-			/*[ENDIF] Java15*/
-		}
-
 		Lookup(Class<?> lookupClass, Class<?> prevLookupClass, int lookupMode) {
-			this(lookupClass, prevLookupClass, lookupMode, lookupJLIPackageCheckDefault());
+			this(lookupClass, prevLookupClass, lookupMode, true);
 		}
 
 		Lookup(Class<?> lookupClass, int lookupMode, boolean doCheck) {
-			this(lookupClass, null, lookupMode, lookupJLIPackageCheckDefault());
+			this(lookupClass, null, lookupMode, doCheck);
 		}
 
 		Lookup(Class<?> lookupClass, int lookupMode) {
@@ -1437,7 +1426,7 @@ public MethodHandles.Lookup in(Class<?> lookupClass) {
 				newPrevAccessClass = null;
 			}
 
-			return new Lookup(lookupClass, newPrevAccessClass, newAccessMode, true);
+			return new Lookup(lookupClass, newPrevAccessClass, newAccessMode);
 			/*[ELSE]*/
 			return new Lookup(lookupClass, newAccessMode);
 			/*[ENDIF] Java14*/
@@ -2225,7 +2214,7 @@ public MethodHandles.Lookup dropLookupMode(int dropMode) {
 				newPrevAccessClass = null;
 			}
 
-			return new Lookup(accessClass, newPrevAccessClass, newAccessMode, true);
+			return new Lookup(accessClass, newPrevAccessClass, newAccessMode);
 			/*[ELSE]*/
 			return new Lookup(accessClass, newAccessMode);
 			/*[ENDIF] Java14*/
@@ -2494,9 +2483,9 @@ public static MethodHandles.Lookup privateLookupIn(Class<?> targetClass, MethodH
 
 		/*[IF Java14]*/
 		if (Objects.equals(targetClassModule, accessClassModule)) {
-			return new Lookup(targetClass, null, callerLookupMode, true);
+			return new Lookup(targetClass, null, callerLookupMode);
 		} else {
-			return new Lookup(targetClass, callerLookup.lookupClass(), (callerLookupMode & ~Lookup.MODULE), true);
+			return new Lookup(targetClass, callerLookup.lookupClass(), (callerLookupMode & ~Lookup.MODULE));
 		}
 		/*[ELSE]*/
 		return new Lookup(targetClass);