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SpringBoot + WebFlux + GraphQL - Expected source object to be an instance of 'com.example.MyObject' but instead got 'reactor.core.publisher.FluxJust'

I am trying to implement a reactive architecture to my Spring+MongoDB+GraphQL app, have followed some tutorials on that, but whenever I return a Publisher<Page> from my GraphQLQueryResolver - I get this error:
2022-11-17 09:18:56.316 ERROR 14166 --- [nio-8081-exec-1]
g.servlet.DefaultGraphQLErrorHandler : Error executing query
(ExceptionWhileDataFetching): Exception while fetching data (/getPages/id) : Expected
source object to be an instance of 'com.example.jobscraperspringserver.types.Page' but
instead got 'reactor.core.publisher.FluxJust'
I've played with the returned object (tried Flux<Page>, Publisher<List<Page>> and other configurations) as well as a type in the schema.graphqls, but none of them work. Besides, that's what supposed to be working in the majority of tutorials as well as some other SO issues, so I suppose that's either a bug somewhere in my code or an architectural flaw (i.e. some faulty dependency that doesn't support the type convertion).
Here is my code:
PageQuery.java
#Component
public class PageQuery implements GraphQLQueryResolver {
#Autowired
PageService pageService;
public Publisher<Page> getPages() {
return pageService.getPages();
}
}
PageService.java
#Service
public class PageService {
public Flux<Page> getPages() {
return Flux.just(new Page(12));
}
}
schema.graphqls
type Page {
id: Int!
host: String
}
type Query {
getPages: Page
}
pom.xml
...
<dependencies>
<!-- Spring -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- GraphQL -->
<dependency>
<groupId>com.graphql-java</groupId>
<artifactId>graphql-spring-boot-starter</artifactId>
<version>5.0.2</version>
</dependency>
<dependency>
<groupId>com.graphql-java</groupId>
<artifactId>graphql-java-tools</artifactId>
<version>5.2.4</version>
</dependency>
<!-- GraphQL subscriptions -->
<dependency>
<groupId>io.projectreactor</groupId>
<artifactId>reactor-core</artifactId>
</dependency>
<!-- MongoDB -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
<version>2.6.3</version>
</dependency>
<dependency>
<groupId>org.mongodb</groupId>
<artifactId>mongodb-driver-reactivestreams</artifactId>
</dependency>
<!-- h2 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<!-- JWT -->
<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt</artifactId>
<version>0.9.1</version>
</dependency>
<!-- Spring Security -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
<version>2.0.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-core</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-config</artifactId>
</dependency>
<!-- WebFlux -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
<version>2.6.4</version>
</dependency>
</dependencies>
...
UPDATE
Apparently com.graphql-java doesn't handle WebFlux, so I've replaced
<dependency>
<groupId>com.graphql-java</groupId>
<artifactId>graphql-spring-boot-starter</artifactId>
<version>5.0.2</version>
</dependency>
with
<dependency>
<groupId>org.springframework.experimental</groupId>
<artifactId>graphql-spring-boot-starter</artifactId>
<version>1.0.0-M3</version>
</dependency>
but now I am getting a null instead of a Page...
UPDATE 2
I've also tried the
<dependency>
<groupId>com.graphql-java-kickstart</groupId>
<artifactId>graphql-spring-boot-starter</artifactId>
<version>11.1.0</version>
</dependency>
<dependency>
<groupId>com.graphql-java-kickstart</groupId>
<artifactId>graphql-kickstart-spring-webflux</artifactId>
<version>11.1.0</version>
</dependency>
but got the same result. I figured it supports a CompletableFuture<List<Page>>, but this is still blocking and I've seen multiple tutorials on returning Mono/Flux from a graphql resolver...
UPDATE 3
I've updated the all the Spring modules' versions to 2.6.3 to be consistent and I've also removed the spring-boot-starter-web dependency, as the spring-boot-starter-webflux should be sufficient; but neither of those fixes have solved my issue.
UPDATE 4
This is the entity I want to return wrapped in a Flux:
#Document("pages")
public class Page {
#Id
private int id;
private String host;
private String path;
private String jobAnchorSelector;
private String jobLinkContains;
private int numberOfPages;
private int interval;
private Date lastScrapePerformed;
private String userUuid;
public Page() {
}
public Page(int id) {
this.id = id;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getHost() {
return host;
}
public void setHost(String host) {
this.host = host;
}
public String getPath() {
return path;
}
public void setPath(String path) {
this.path = path;
}
public String getJobAnchorSelector() {
return jobAnchorSelector;
}
public void setJobAnchorSelector(String jobAnchorSelector) {
this.jobAnchorSelector = jobAnchorSelector;
}
public String getJobLinkContains() {
return jobLinkContains;
}
public void setJobLinkContains(String jobLinkContains) {
this.jobLinkContains = jobLinkContains;
}
public int getNumberOfPages() {
return numberOfPages;
}
public void setNumberOfPages(int numberOfPages) {
this.numberOfPages = numberOfPages;
}
public String toString() {
return "Page [" + host + path + "]";
}
public int getInterval() {
return interval;
}
public void setInterval(int interval) {
this.interval = interval;
}
public Date getLastScrapePerformed() {
return lastScrapePerformed;
}
public void setLastScrapePerformed(Date lastScrapePerformed) {
this.lastScrapePerformed = lastScrapePerformed;
}
public String getUserUuid() {
return userUuid;
}
public void setUserUuid(String userUuid) {
this.userUuid = userUuid;
}
}
It's a MongoDB document and I'm using a ReactiveMongoRepository to fetch that, however for the sake of simplifying this issue I was trying to return just a Flux.just(new Page(2)).

First of all, if you're using Spring Boot, I would recommend that you use spring-boot-starter-graphql instead of graphql-spring-boot-starter, and you need to add spring-boot-starter-webflux to implement reactive data fetchers. Also if you want to return Flux, you should define returned type as an array in the schema (e.g. getPages: [Page!]!), otherwise, you should return Mono.
This will allow you to implement your query like this:
#Controller
public class PageController {
// ...
#QueryMapping
public Flux<Page> getPages() {
return pageService.getPages();
}
}
But you should note that by default Mono and Flux are adapted to a CompletableFuture where Flux values are aggregated and turned into a List. If you want to stream responses, then you should also use GraphQL subscription instead of a query.

Unable to persist Spring data mongodb using save on repository

I am using Spring Data Mongodb and Embeded mongoDB to persist the data.
Pom.xml
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>de.flapdoodle.embed</groupId>
<artifactId>de.flapdoodle.embed.mongo</artifactId>
</dependency>
applicaiton.properties
spring.data.mongodb.port=2019
spring.data.mongodb.database=testdb
spring.data.mongodb.host=localhost
Main class:
#SpringBootApplication
#EnableAutoConfiguration
#EnableMongoRepositories(basePackages = { "com.koka.mongotest.repo"})
public class MongotestApplication {
public static void main(String[] args) {
SpringApplication.run(MongotestApplication.class, args);
}
}
Enity or Domain class :
#Document
public class Person
{
#Indexed
private String personId;
private String name;
//getter and setters
}
Repo:
#Repository
public interface PersonRepo extends MongoRepository { //No Custom emthod}
Service layer :
#Service
public class ServiceImpl {
#Autowired
PresonRepo repo;
public void saveJon(Person p )
{
repo.save(p);
}
}
but Int DB its getting saved as
{"_id":{"$oid":"60e18f9d7eb50d70b56b543f"},"_class":"com.koka.mongotest.entity.Person"}
But that person Object hold info which is not being saved. Please advise on this,

How can I mock final inner class here [closed]

Closed. This question needs debugging details. It is not currently accepting answers.
Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question.
Closed 3 years ago.
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Class for which I m writing Junits:
public class AImpl implements AInterface {
public String method1(String id) throws Exception {
String s = Service.Factory.getInstance().generate(id);
return s;
}
}
Interface to be instantiated using its Inner class:
public interface Service {
String generate(String var1) throws Exception;
public static final class Factory {
private static Service instance = null;
public Factory() {
}
public static final Service getInstance() {
if (instance == null) {
instance = (Service)EnterpriseConfiguration.getInstance().loadImplementation(Service.class);
}
return instance;
}
}
}
I have tried powerMockito but it is not working.
#Test
public void generateTest() throws Exception {
Service.Factory innerClassMock = mock(Service.Factory.class);
String id= "id";
whenNew(Service.Factory.class).withArguments(anyString()).thenReturn(innerClassMock);
whenNew(innerClassMock.getInstance().generate("hjgh")).withAnyArguments().thenReturn(id);
id= AImpl.generate("hjgh");
Assert.assertEquals("id", id);
}

If I understand well your not cleary code you need this junit:
#RunWith(PowerMockRunner.class)
#PrepareForTest({Service.Factory.class})
public class AImplTest {
private Service serviceMock;
#Before
public void setUp() {
PowerMockito.mockStatic(Service.Factory.class);
serviceMock = Mockito.mock(Service.class);
PowerMockito.when(Service.Factory.getInstance()).thenReturn(serviceMock);
}
#Test
public void generateTest() throws Exception {
Mockito.doReturn("mockid").when(serviceMock).generate(Mockito.anyString());
Assert.assertEquals("mockid", new AImpl().method1("aaa"));
}
}
Here my dependencies:
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mockito/mockito-core -->
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
<version>2.28.2</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.powermock/powermock-module-junit4 -->
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-module-junit4</artifactId>
<version>2.0.4</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.powermock/powermock-api-mockito2 -->
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-api-mockito2</artifactId>
<version>2.0.4</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.powermock/powermock-core -->
<dependency>
<groupId>org.powermock</groupId>
<artifactId>powermock-core</artifactId>
<version>2.0.4</version>
<scope>test</scope>
</dependency>
Having said that I would change your Service.Factory class: here you need a private constructor in order to implement correctly the singleton pattern.

Mockito failing to mock Interface class in SpringBoot

I am trying to test one test case using controller class with service interface and interface impl class. But it's always failing and returning either null pointer exception or not found custom exception even mocking the method to return mock values.
Controller.class
#RestController
public class RestAPIController {
#Autowired
RestAPIService restAPIService;
#PostMapping(path = "list/{id}")
public ResponseEntity<List<Employee>> findByID(#PathVariable(value = "id") String id)
throws RestAPIException {
List<Employee> list = restAPIService.findByID(id);
if (list == null || list.isEmpty()) {
throw new IDNotFoundException(id);
}
return new ResponseEntity<>(list, HttpStatus.OK);
}
Service Interface:
#Service
public interface RestAPIService {
public List<Employee> findByID(#Param("id") String id) throws RestAPIException;
}
Service impl class:
#Service
public class RestAPIServiceImpl implements RestAPIService {
#Override
public List<Employee> findByID(String id) throws RestAPIException {
return serviceUtils.transformationObj(repository.findByID(id));
}
}
Test Class
#Mock
RestAPIService restAPIServiceImpl;
#InjectMocks
RestAPIController restAPIController;
#Test
public void testListByIDController() throws RestAPIException {
Mockito.when(restAPIServiceImpl.findByID("1")).thenReturn(baseDTOData());
ResponseEntity<List<Employee>> expectedList = restAPIController.findByID("1");
assertEquals(1, expectedList.getBody().size());
}
private List<Employee> baseDTOData() {
List<Employee> list = new ArrayList<>();
Employee e = new Employee();
e.setId("2");
list.add(e);
return list;
}
pom.xml (using JUnit5)
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<!-- exclude junit 4 -->
<exclusions>
<exclusion>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- Junit 5 -->
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-launcher</artifactId>
<scope>test</scope>
</dependency>
<!-- Mockito extention -->
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-junit-jupiter</artifactId>
<scope>test</scope>
</dependency>
The above code is failing and enters into IDNotFoundException but mock return is not working.
Can anyone please help on this.

sqlite with hibernate and spring

I have a problem with sqlite3, hibernate and spring.In fact, if I start the program and call the createType () method that creates a type and after that I call the getAllTypes () method I have the values ​​of the object I just created appear in the browser.But if I check with a "select * from type" in my table type to see if the object was added in my table, I have no record. In addition, as soon as I restart the program and I call the method getAllTypes () to view the data of my table I have nothing that appears in my browser.Again, for each startup looks like the ID is reset since it starts at 1 (for example if after starting my program I try to insert 2 objects with the method createType () I have: ID = 1 and ID = 2 which appears in my browser). So if my data is not saved in my table where have they been? I made 2 recordings manually in my table and I also can not get these 2 records with the methods getAllTypes () which is supposed to send me all the records of my table. I'm told that there may be a communication problem between my program and my database.Thank you in advance for your help!!!
This is how I call my methods in browsers:
http://localhost:8080/types/getAllTypes
http://localhost:8080/types/insert
application.yml
spring:
profile:dev
jpa:
hibernate:
hbm2ddl.auto:update
properties:
hibernate:
dialect:org.hibernate.dialect.SQLiteDialect
datasource:
url:jdbc:sqlite:C:\Users\user pc\Desktop\PDF\testrest.db
username:user
password:password
driverClassName:org.sqlite.JDBC
My dependency in my pom.xml for the configuration of sqlite,hibernate and spring :
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<type>pom</type>
</parent>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.2.12.Final</version>
</dependency>
<dependency>
<groupId>org.xerial</groupId>
<artifactId>sqlite-jdbc</artifactId>
<version>3.20.1</version>
</dependency>
<dependency>
<groupId>com.zsoltfabok</groupId>
<artifactId>sqlite-dialect</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>1.4.196</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>5.2.12.Final</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>4.0</version>
</dependency>
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.0</version>
<dependency>
My table type:
CREATE TABLE IF NOT EXISTS type(
idType integer NOT NULL PRIMARY KEY AUTOINCREMENT,
description varchar(256) NOT NULL
)
My entities type:
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
#Entity
#Table(name="typedifficulte")
public class Type {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private long idType;
private String description;
public Type() {
}
public Type(String description) {
this.description = description;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public long getIdType() {
return idType;
}
public void setIdType(long idType) {
this.idType = idType;
}
}
My interface TypeService :
public interface TypeService {
Collection<Type> getAllTypes();
Type createType(Type type);
}
My TypeServiceImpl :
import javax.annotation.Resource;
import org.apache.commons.collections4.IteratorUtils;
import org.springframework.stereotype.Service;
#Service(value="typeService")
public class TypeServiceImpl implements TypeService {
#Resource
private TypeRepository typeRepository;
#Override
public Collection<Type> getAllTypes() {
return IteratorUtils.toList(this.typeRepository.findAll().iterator());
}
#Override
public Type createType(Type type) {
return this.typeRepository.save(type);
}
public TypeRepository getTypeRepository() {
return typeRepository;
}
public void setTypeRepository(TypeRepository typeRepository) {
this.typeRepository = typeRepository;
}
}
My TypeRepository :
public interface TypeRepository extends CrudRepository<Type,Long> {
Type findByDescription(String description);
}
My Controller :
#RestController
#RequestMapping(value ="/types")
public class TypeController {
#Resource
private TypeService typeService;
#RequestMapping(value= "/getAllTypes", method = RequestMethod.GET)
public Collection<Type> getAllTypes() {
return this.typeService.findAll();
}
#RequestMapping(value = "/insert",method = RequestMethod.GET)
public Type createType() {
return this.typeService.createType(new Type("test"));
}
}
And finally my startup class :
#Configuration
#EnableAutoConfiguration
#ComponentScan
public class MainLauncher {
public static void main(String[] args) {
SpringApplication.run(MainLauncher.class, args);
}
}