DATAGRAPH-1377 - Add unknown entities to mapping context when called from templates.

src/main/java/org/springframework/data/neo4j/core/Neo4jTemplate.java

@@ -378,6 +378,7 @@ public final class Neo4jTemplate implements Neo4jOperations, BeanFactoryAware {
 	private <T> ExecutableQuery<T> createExecutableQuery(Class<T> domainType, String cypherStatement,
 			Map<String, Object> parameters) {
 
+		Assert.notNull(neo4jMappingContext.getPersistentEntity(domainType), "Cannot get or create persistent entity.");
 		PreparedQuery<T> preparedQuery = PreparedQuery.queryFor(domainType).withCypherQuery(cypherStatement)
 				.withParameters(parameters).usingMappingFunction(neo4jMappingContext.getRequiredMappingFunctionFor(domainType))
 				.build();

src/main/java/org/springframework/data/neo4j/core/ReactiveNeo4jTemplate.java

@@ -374,6 +374,7 @@ public final class ReactiveNeo4jTemplate implements ReactiveNeo4jOperations, Bea
 	private <T> Mono<ExecutableQuery<T>> createExecutableQuery(Class<T> domainType, String cypherQuery,
 			Map<String, Object> parameters) {
 
+		Assert.notNull(neo4jMappingContext.getPersistentEntity(domainType), "Cannot get or create persistent entity.");
 		PreparedQuery<T> preparedQuery = PreparedQuery.queryFor(domainType).withCypherQuery(cypherQuery)
 				.withParameters(parameters)
 				.usingMappingFunction(this.neo4jMappingContext.getRequiredMappingFunctionFor(domainType)).build();

src/main/java/org/springframework/data/neo4j/core/mapping/DefaultNeo4jConverter.java

@@ -405,7 +405,7 @@ final class DefaultNeo4jConverter implements Neo4jConverter {
 		Map<Object, Object> relationshipsAndProperties = new HashMap<>();
 
 		// if the list is null the mapping is based on a custom query
-		if (list == Values.NULL) {
+		if (Values.NULL.equals(list)) {
 
 			Predicate<Value> isList = entry -> entry instanceof Value && typeSystem.LIST().isTypeOf(entry);