Make ErrorPageSecurityFilter compatible with Servlet 3.1

Ensure that all default methods are implemented so that the
filter is compatible with Servlet 3.1 environments.

Fixes gh-29558

Author: philwebb

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/servlet/filter/ErrorPageSecurityFilter.java

@@ -114,6 +114,10 @@ private WebInvocationPrivilegeEvaluator getPrivilegeEvaluatorBean() {
 		}
 	}
 
+	@Override
+	public void destroy() {
+	}
+
 	/**
 	 * {@link WebInvocationPrivilegeEvaluator} that always allows access.
 	 */

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/servlet/filter/ErrorPageSecurityFilterTests.java

@@ -16,7 +16,10 @@
 
 package org.springframework.boot.web.servlet.filter;
 
+import java.lang.reflect.Method;
+
 import javax.servlet.DispatcherType;
+import javax.servlet.Filter;
 import javax.servlet.FilterChain;
 import javax.servlet.RequestDispatcher;
 
@@ -32,6 +35,7 @@
 import org.springframework.security.core.context.SecurityContext;
 import org.springframework.security.core.context.SecurityContextHolder;
 import org.springframework.security.web.access.WebInvocationPrivilegeEvaluator;
+import org.springframework.util.ReflectionUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.any;
@@ -145,4 +149,18 @@ void whenThereIsAContextPathAndServletIsMappedToWildcardPathCorrectPathIsPassedT
 		verify(this.privilegeEvaluator).isAllowed(eq("/dispatcher/path/error"), any());
 	}
 
+	@Test
+	void filterIsCompatibleWithServlet31() {
+		Method[] methods = Filter.class.getDeclaredMethods();
+		for (Method method : methods) {
+			if (method.isDefault()) {
+				Method securityFilterMethod = ReflectionUtils.findMethod(ErrorPageSecurityFilter.class,
+						method.getName(), method.getParameterTypes());
+				assertThat(securityFilterMethod).isNotNull();
+				assertThat(securityFilterMethod.getDeclaringClass()).as(method.getName())
+						.isEqualTo(ErrorPageSecurityFilter.class);
+			}
+		}
+	}
+
 }