Allow null arguments in method calls to DyanmicProxyable repositories. (#2040)

Closes #2025.

Signed-off-by: mikereiche <[email protected]>

Author: mikereiche

src/main/java/org/springframework/data/couchbase/repository/support/FindMethod.java

@@ -74,6 +74,8 @@ private static Method internalFind(Method[] toTest, String name, Class[] paramet
                     continue;
                 if(params[j] == boolean.class && parameterTypes[j] == Boolean.class )
                     continue;
+                if(parameterTypes[j] == null && Object.class.isAssignableFrom(params[j])) // any non-primitive
+                    continue;
                 if (!params[j].isAssignableFrom(parameterTypes[j]))
                     break;
             }

src/test/java/org/springframework/data/couchbase/repository/ReactiveCouchbaseRepositoryQueryIntegrationTests.java

@@ -19,6 +19,7 @@
 import static java.util.Arrays.asList;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
@@ -141,7 +142,20 @@ void findBySimpleProperty() {
 			Airport airport1 = reactiveAirportRepository.findById(airports.get(0).getId()).block();
 			assertEquals(airport1.getIata(), vie.getIata());
 			Airport airport2 = reactiveAirportRepository.findByIata(airports.get(0).getIata()).block();
-			assertEquals(airport1.getId(), vie.getId());
+			assertEquals(airport2.getId(), vie.getId());
+		} finally {
+			reactiveAirportRepository.delete(vie).block();
+		}
+	}
+
+	@Test
+	void testNullParamToDyanmicProxyable() {
+		Airport vie = null;
+		try {
+			vie = new Airport("airports::vie", "vie", "low2");
+			reactiveAirportRepository.save(vie).block();
+			Airport airport2 = reactiveAirportRepository.withCollection("_default").findByIata(null).block();
+			assertNull(airport2);
 		} finally {
 			reactiveAirportRepository.delete(vie).block();
 		}