CORDA-3469: Allow EvolutionSerializer to handle boxed types becoming primitive. (#5766)

serialization/src/main/kotlin/net/corda/serialization/internal/amqp/EvolutionSerializerFactory.kt

@@ -114,13 +114,17 @@ class DefaultEvolutionSerializerFactory(
                     // This includes assigning a primitive type to its equivalent "boxed" type.
                     val evolverPropertyType = evolverProperty.type.observedType.asClass()
                     evolverPropertyType.isAssignableFrom(propertyType)
-                        || (propertyType.isPrimitive && evolverPropertyType.isAssignableFrom(primitiveBoxedTypes[propertyType]
-                                ?: throw IllegalStateException("Unknown primitive type '$propertyType'")))
+                        || (propertyType.isPrimitive && evolverPropertyType.isAssignableFrom(boxed(propertyType)))
+                        || (evolverPropertyType.isPrimitive && boxed(evolverPropertyType).isAssignableFrom(propertyType))
                 }
             }
         }
     }
 
+    private fun boxed(primitiveType: Class<*>): Class<*> {
+        return primitiveBoxedTypes[primitiveType] ?: throw IllegalStateException("Unknown primitive type '$primitiveType'")
+    }
+
     private fun RemoteTypeInformation.Composable.validateEvolvability(localProperties: Map<PropertyName, LocalPropertyInformation>) {
         val remotePropertyNames = properties.keys
         val localPropertyNames = localProperties.keys

serialization/src/test/kotlin/net/corda/serialization/internal/amqp/EvolvabilityTests.kt

@@ -768,4 +768,27 @@ class EvolvabilityTests {
         assertEquals(1, deserializedCC.a)
         assertEquals(42, deserializedCC.b)
     }
+
+    @Test
+    fun addMandatoryFieldWithAltConstructorAndMakeExistingNullableIntFieldMandatory() {
+        val sf = testDefaultFactory()
+        val resource = "EvolvabilityTests.addMandatoryFieldWithAltConstructorAndMakeExistingNullableIntFieldMandatory"
+
+        // Original version of the class as it was serialised
+        // data class CC(val a: Int?)
+        // File(URI("$localPath/$resource")).writeBytes(SerializationOutput(sf).serialize(CC(null)).bytes)
+
+        data class CC(val a: Int, val b: Int) {
+            @DeprecatedConstructorForDeserialization(1)
+            @Suppress("unused")
+            constructor(a: Int?) : this(a ?: -1,42)
+        }
+
+        val url = EvolvabilityTests::class.java.getResource(resource) ?: fail("Not found!")
+        val sc2 = url.readBytes()
+        val deserializedCC = DeserializationInput(sf).deserialize(SerializedBytes<CC>(sc2))
+
+        assertEquals(-1, deserializedCC.a)
+        assertEquals(42, deserializedCC.b)
+    }
 }