SEC-756: Refactored GlobalMethodSecurityDefinitionParser and added check for duplicate registration.

core-tiger/src/test/java/org/springframework/security/config/GlobalMethodSecurityBeanDefinitionParserTests.java

@@ -5,6 +5,7 @@ import static org.junit.Assert.assertEquals;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
+import org.springframework.beans.factory.parsing.BeanDefinitionParsingException;
 import org.springframework.context.support.AbstractXmlApplicationContext;
 import org.springframework.context.support.ClassPathXmlApplicationContext;
 import org.springframework.security.AccessDeniedException;
@@ -79,6 +80,14 @@ public class GlobalMethodSecurityBeanDefinitionParserTests {
         assertEquals("Hello from the post processor!", service.getPostProcessorWasHere());
     }
     
+    @Test(expected=BeanDefinitionParsingException.class)
+    public void duplicateElementCausesError() {
+        setContext(
+                "<global-method-security />" +
+                "<global-method-security />"
+        );
+    }
+    
     private void setContext(String context) {
         appContext = new InMemoryXmlApplicationContext(context);
     }