Support Serialization for SecurityConfig

Issue gh-16276

Author: jzheaux

config/src/test/java/org/springframework/security/SpringSecurityCoreVersionSerializableTests.java

@@ -60,6 +60,7 @@
 import org.springframework.mock.web.MockHttpSession;
 import org.springframework.security.access.AccessDeniedException;
 import org.springframework.security.access.AuthorizationServiceException;
+import org.springframework.security.access.SecurityConfig;
 import org.springframework.security.access.intercept.RunAsUserToken;
 import org.springframework.security.authentication.AbstractAuthenticationToken;
 import org.springframework.security.authentication.AccountExpiredException;
@@ -442,6 +443,7 @@ class SpringSecurityCoreVersionSerializableTests {
 		generatorByClassName.put(JaasAuthenticationSuccessEvent.class,
 				(r) -> new JaasAuthenticationSuccessEvent(authentication));
 		generatorByClassName.put(AbstractSessionEvent.class, (r) -> new AbstractSessionEvent(securityContext));
+		generatorByClassName.put(SecurityConfig.class, (r) -> new SecurityConfig("value"));
 
 		// cas
 		generatorByClassName.put(CasServiceTicketAuthenticationToken.class, (r) -> {

config/src/test/resources/serialized/6.4.x/org.springframework.security.access.SecurityConfig.serialized

@@ -16,6 +16,7 @@
 
 package org.springframework.security.access;
 
+import java.io.Serial;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -29,6 +30,9 @@
  */
 public class SecurityConfig implements ConfigAttribute {
 
+	@Serial
+	private static final long serialVersionUID = -7138084564199804304L;
+
 	private final String attrib;
 
 	public SecurityConfig(String config) {

core/src/main/java/org/springframework/security/access/SecurityConfig.java

@@ -30,6 +30,7 @@
  * @deprecated Use {@link AuthorizationManagerBeforeMethodInterceptor#jsr250()} instead
  */
 @Deprecated
+@SuppressWarnings("serial")
 public class Jsr250SecurityConfig extends SecurityConfig {
 
 	public static final Jsr250SecurityConfig PERMIT_ALL_ATTRIBUTE = new Jsr250SecurityConfig(PermitAll.class.getName());