Remove System.security field for JDK 24+

With the removal of the security manager (JEP 486) the System.security
field is not used for anything meaningful.

Signed-off-by: Theresa Mammarella <[email protected]>

Author: theresa-m

jcl/src/java.base/share/classes/java/lang/System.java

@@ -124,10 +124,12 @@ public final class System {
 	 */
 	private static Properties systemProperties;
 
+	/*[IF JAVA_SPEC_VERSION < 24]*/
 	/**
 	 * The System default SecurityManager.
 	 */
 	private static SecurityManager security;
+	/*[ENDIF] JAVA_SPEC_VERSION < 24 */
 
 	private static volatile Console console;
 	private static volatile boolean consoleInitialized;
@@ -1085,7 +1087,11 @@ public static String setProperty(String prop, String value) {
 @Deprecated(since="17", forRemoval=true)
 /*[ENDIF] JAVA_SPEC_VERSION >= 17 */
 public static SecurityManager getSecurityManager() {
+	/*[IF JAVA_SPEC_VERSION >= 24]*/
+	return null;
+	/*[ELSE] JAVA_SPEC_VERSION >= 24 */
 	return security;
+	/*[ENDIF] JAVA_SPEC_VERSION >= 24 */
 }
 
 /**

runtime/oti/vmconstantpool.xml

@@ -502,7 +502,7 @@ SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-ex
 	<!-- Static method references needed to support VirtualThread/Continuation. -->
 	<staticmethodref class="jdk/internal/vm/Continuation" name="enter" signature="(Ljdk/internal/vm/Continuation;)V" versions="19-"/>
 	<!-- Security manager check -->
-	<staticfieldref class="java/lang/System" name="security" signature="Ljava/lang/SecurityManager;"/>
+	<staticfieldref class="java/lang/System" name="security" signature="Ljava/lang/SecurityManager;" versions="8-23"/>
 
 	<!-- VM constants in java -->
 	<staticfieldref class="com/ibm/oti/vm/VM" name="J9_GC_WRITE_BARRIER_TYPE" signature="I"/>

runtime/vm/resolvesupport.cpp

@@ -160,6 +160,9 @@ isMethodHandleINL(U_8 *methodName, U_16 methodNameLength)
 UDATA   
 packageAccessIsLegal(J9VMThread *currentThread, J9Class *targetClass, j9object_t protectionDomain, UDATA canRunJavaCode)
 {
+#if JAVA_SPEC_VERSION >= 24
+	return TRUE;
+#else /* JAVA_SPEC_VERSION >= 24 */
 	UDATA legal = FALSE;
 	j9object_t security = J9VMJAVALANGSYSTEM_SECURITY(currentThread, J9VMCONSTANTPOOL_CLASSREF_AT(currentThread->javaVM, J9VMCONSTANTPOOL_JAVALANGSYSTEM)->value);
 	if (NULL == security) {
@@ -175,6 +178,7 @@ packageAccessIsLegal(J9VMThread *currentThread, J9Class *targetClass, j9object_t
 		}
 	}
 	return legal;
+#endif /* JAVA_SPEC_VERSION >= 24 */
 }
 
 BOOLEAN