SEC-1980: Prevent parser warning when URL's in configuration start with #

Previously a warning would be logged to the parser when a URL was
configured with a SpEL expression. These changes prevent warnings from
being logged when using SpEL for URL configuration.

config/src/test/java/org/springframework/security/config/http/WebConfigUtilsTest.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2002-2012 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.security.config.http;
+
+import static org.mockito.Mockito.verifyZeroInteractions;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.powermock.core.classloader.annotations.PrepareOnlyThisForTest;
+import org.powermock.modules.junit4.PowerMockRunner;
+import org.springframework.beans.factory.xml.ParserContext;
+
+
+@RunWith(PowerMockRunner.class)
+@PrepareOnlyThisForTest(ParserContext.class)
+public class WebConfigUtilsTest {
+    public final static String URL = "/url";
+
+    @Mock
+    private ParserContext parserContext;
+
+    // SEC-1980
+    @Test
+    public void validateHttpRedirectSpELNoParserWarning() {
+        WebConfigUtils.validateHttpRedirect("#{T(org.springframework.security.config.http.WebConfigUtilsTest).URL}", parserContext, "fakeSource");
+        verifyZeroInteractions(parserContext);
+    }
+}