DATACMNS-1150 - Projection methods with SpEL expressions can now use method parameters.

We now forward method parameters of methods on projection interfaces to the expression evaluation. The parameters are exposed via an array named "args".

src/test/java/org/springframework/data/projection/SpelEvaluatingMethodInterceptorUnitTests.java

@@ -104,6 +104,21 @@ public class SpelEvaluatingMethodInterceptorUnitTests {
 		assertThat(interceptor.invoke(invocation)).isEqualTo("Dave");
 	}
 
+	@Test // DATACMNS-1150
+	public void forwardsParameterIntoSpElExpressionEvaluation() throws Throwable {
+
+		DefaultListableBeanFactory factory = new DefaultListableBeanFactory();
+		factory.registerSingleton("someBean", new SomeBean());
+
+		when(invocation.getMethod()).thenReturn(Projection.class.getMethod("invokeBeanWithParameter", Integer.class));
+		when(invocation.getArguments()).thenReturn(new Object[] { 1 });
+
+		MethodInterceptor interceptor = new SpelEvaluatingMethodInterceptor(delegate, new Target(), factory, parser,
+				Projection.class);
+
+		assertThat(interceptor.invoke(invocation)).isEqualTo("property1");
+	}
+
 	interface Projection {
 
 		@Value("#{target.name}")
@@ -115,6 +130,9 @@ public class SpelEvaluatingMethodInterceptorUnitTests {
 		String getName();
 
 		String getAddress();
+
+		@Value("#{@someBean.someMethod(target, args[0])}")
+		String invokeBeanWithParameter(Integer parameter);
 	}
 
 	interface InvalidProjection {
@@ -135,5 +153,9 @@ public class SpelEvaluatingMethodInterceptorUnitTests {
 		public String getValue() {
 			return "value";
 		}
+
+		public String someMethod(Target target, Integer parameter) {
+			return target.getName() + parameter.toString();
+		}
 	}
 }