Update Struts 2.6.0 build with some newer (compatible) library versions.

- Add missing multiple-success.jsp for Showcase application.
- Enhance main pom.xml maven-surefire-plugin configuration to avoid some test-ng related duplication failures:  "Cannot find JUnit method class junit.framework.TestSuite$1.warning".
- Remove unnecessary plugins/embeddedjsp/pom.xml (struts2-embeddedjsp-plugin) maven-surefire-plugin version override (noted with preceding change).
- Update Struts 2.6.0 build to use some newer (compatible) library versions.
  Change the main pom.xml library versions for the following:
  - spring.platformVersion 4.3.13.RELEASE -> 4.3.20.RELEASE
  - oval 1.31 -> 1.90  (Note: required unit test fix for OValValidationInterceptorTest.java AND code fix for OvalValidationInterceptor.java)
                       (Additional Note: 1.70 was the most recent that functioned without a fix to OvalValidationInterceptor)
  - jackson 2.9.6 -> 2.9.7
  - fluido-skin.version 1.6 -> 1.7
  - slf4j (slf4j-api, slf4j-simple) 1.7.12 -> 1.7.25
  - xstream 1.4.10 -> 1.4.11.1
  - jetty 6.1.9 -> 6.1.26 (last in 6.1.x line)
  - xerces 2.10.0 - > 2.12.0
  - org.owasp 3.1.1 -> 3.3.4
  - versions-maven-plugin 2.5 -> 2.7
  - doxia-core 1.7 -> 1.8
  - doxia-module-markdown 1.3 -> 1.7
  - org.apache.felix.main 4.0.3 -> 4.6.1  (Note: most recent 4.x)
  - easymock 3.4 -> 3.5.1
  - javax.el 3.0 -> 3.0.1-b10
  - jasper 6.0.18 -> 6.0.53  (Note: most recent 6.0.x)
  - juli 6.0.18 -> 6.0.53    (Note: most recent 6.0.x)
  - commons-logging 1.1.3 -> 1.2
  - commons-collections4 4.1 -> 4.2
  - commons-io 2.5 -> 2.6
  - commons-lang3 3.6 -> 3.8.1
  - commons-text 1.2 -> 1.3  (Note: most recent compatible with Java 7)
  - commons-validator 1.5.1 -> 1.6
  - mockito 1.9.5 -> 1.10.19            (Note: most recent 1.x)
  - cdi-api 1.0-SP1 -> 1.0-SP4          (Note: most recent 1.0.x)
  - weld-core 1.0.1-Final -> 1.0.1-SP4  (Note: most recent 1.0.x)
  - cglib 2.2 -> 2.2.2                  (Note: most recent 2.2.x)
  Note for cglib-nodep:  Build succeeded with cglib-nodep 2.2.2 and 3.2.5.  Although
    cglib 3.2.5 matches ASM 5.2, jmock-cglib 1.2.0 identifies cglib-nodep 2.1_3 as its
    requirement (on the JMock http://jmock.org/download.html download page) so it should
    probably remain as long as JMock 1.2.0 is used.

plugins/oval/src/main/java/org/apache/struts2/oval/interceptor/OValValidationInterceptor.java

@@ -166,7 +166,8 @@ public class OValValidationInterceptor extends MethodFilterInterceptor {
         List<Configurer> configurers = validationManager.getConfigurers(clazz, context, validateJPAAnnotations);
 
         Validator validator = configurers.isEmpty() ? new Validator() : new Validator(configurers);
-        validator.addExpressionLanguage("ognl", ognlExpressionLanguage);
+        // Note: For Oval <= 1.70, API requires "validator.addExpressionLanguage("ognl", ognlExpressionLanguage)".
+        validator.getExpressionLanguageRegistry().registerExpressionLanguage("ognl", ognlExpressionLanguage);  // Usage for Oval >= 1.80 due to API changes
         //if the method is annotated with a @Profiles annotation, use those profiles
         Method method = clazz.getMethod(methodName, new Class[0]);
         if (method != null) {

plugins/oval/src/test/java/org/apache/struts2/oval/interceptor/OValValidationInterceptorTest.java

@@ -28,6 +28,8 @@ import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
 
+import junit.framework.AssertionFailedError;
+
 public class OValValidationInterceptorTest extends XWorkTestCase {
     public void testSimpleFieldsXML() throws Exception {
         ActionProxy baseActionProxy = actionProxyFactory.createActionProxy("oval", "simpleFieldsXML", null, null);
@@ -283,7 +285,18 @@ public class OValValidationInterceptorTest extends XWorkTestCase {
         assertEquals(5, fieldErrors.size()); // 5: as there will be field errors for 'model' and 'address' themselves
         assertValue(fieldErrors, "name", Arrays.asList("name cannot be null"));
         assertValue(fieldErrors, "email", Arrays.asList("email cannot be null"));
-        assertValue(fieldErrors, "address.street", Arrays.asList("street cannot be smaller than 7 characters"));
+        try {
+            // Oval version <= 1.40 validation error for invalid data reports: "net.sf.oval.constraint.AssertValid.violated".
+            assertValue(fieldErrors, "address", Arrays.asList("net.sf.oval.constraint.AssertValid.violated"));
+            // Oval version <= 1.40 validation error for minimum length reports: "street cannot be smaller than 7 characters".
+            assertValue(fieldErrors, "address.street", Arrays.asList("street cannot be smaller than 7 characters"));
+        }
+        catch (AssertionFailedError afe) {
+            // Oval version >= 1.50 validation error for invalid data reports: "address is invalid".
+            assertValue(fieldErrors, "address", Arrays.asList("address is invalid"));
+            // Oval version >= 1.50 validation error for minimum length reports: "street cannot be shorter than 7 characters".
+            assertValue(fieldErrors, "address.street", Arrays.asList("street cannot be shorter than 7 characters"));
+        }
 
     }
 
@@ -300,7 +313,19 @@ public class OValValidationInterceptorTest extends XWorkTestCase {
     	assertEquals(5, fieldErrors.size()); // 5: as there will be field errors for 'person' and 'person.address' themselves
     	assertValue(fieldErrors, "person.name", Arrays.asList("name cannot be null"));
     	assertValue(fieldErrors, "person.email", Arrays.asList("email cannot be null"));
-    	assertValue(fieldErrors, "person.address.street", Arrays.asList("street cannot be smaller than 7 characters"));
+       try {
+           // Oval version <= 1.40 validation error for invalid data reports: "net.sf.oval.constraint.AssertValid.violated".
+           assertValue(fieldErrors, "person.address", Arrays.asList("net.sf.oval.constraint.AssertValid.violated"));
+           // Oval version <= 1.40 validation error for minimum length reports: "street cannot be smaller than 7 characters".
+           assertValue(fieldErrors, "person.address.street", Arrays.asList("street cannot be smaller than 7 characters"));
+       }
+       catch (AssertionFailedError afe) {
+           // Oval version >= 1.50 validation error for invalid data reports: "address is invalid".
+           assertValue(fieldErrors, "person.address", Arrays.asList("address is invalid"));
+           // Oval version >= 1.50 validation error for minimum length reports: "street cannot be shorter than 7 characters".
+           assertValue(fieldErrors, "person.address.street", Arrays.asList("street cannot be shorter than 7 characters"));
+       }
+
     }