I want to test GraphQL for a future project. The project will use Spring Boot, Spring Security, and GraphQL. So I created a new Spring Boot App in IntelliJ using the build in Spring Initializr. The Spring Boot version is, of course, the latest (2.0.3.RELEASE) Now I add the dependencies for GraphQL and GraphiQL.
<dependency>
<groupId>com.graphql-java</groupId>
<artifactId>graphql-spring-boot-starter</artifactId>
<version>4.3.0</version>
</dependency>
<dependency>
<groupId>com.graphql-java</groupId>
<artifactId>graphql-java-tools</artifactId>
<version>5.2.0</version>
</dependency>
<dependency>
<groupId>com.graphql-java</groupId>
<artifactId>graphiql-spring-boot-starter</artifactId>
<version>4.3.0</version>
</dependency>
To test this, I ran the application but there was no /graphql
endpoint. In this case, I configured it in application.properties
without a problem:
# GraphQL
graphql.servlet.mapping=/graphql
graphql.servlet.enabled=true
graphql.servlet.corsEnabled=true
# GraphiQL
graphiql.mapping=/graphiql
graphiql.endpoint=/graphql
graphiql.enabled=true
graphiql.cdn.enabled=true
graphiql.cdn.version=0.11.11
After testing again, the endpoint is there, so now I could write a schema, resolvers and so on. This is what I implemented:
Schema:
schema {
query: Query
mutation: Mutation
}
type Greeting {
id: ID!
message: String!
}
type Query {
greetingsAll: [Greeting]
}
type Mutation {
greeting(message: String!): Greeting
}
Model:
@NoArgsConstructor
@AllArgsConstructor
@Getter
@Setter
@Builder
@ToString
@Entity
public class Greeting {
@Id
@GeneratedValue
private Long id;
private String message;
}
Repository
@Repository
public interface GreetingRepository extends JpaRepository<Greeting, Long> {
}
QueryResolver
@Component
public class QueryResolver implements GraphQLQueryResolver {
@Autowired
private GreetingRepository greetingRepository;
public Greeting greeting(Long id) {
return greetingRepository.getOne(id);
}
public Iterable<Greeting> getGreetingsAll() {
return greetingRepository.findAll();
}
}
MutationResolver
@Component
public class MutationResolver implements GraphQLMutationResolver {
@Autowired
private GreetingRepository greetingRepository;
public Greeting newGreeting(String message) {
Greeting greeting = new Greeting();
greeting.setMessage(message);
return greetingRepository.save(greeting);
}
}
Beans for SpringBoot
@SpringBootApplication
public class GraphqlApplication {
public static void main(String[] args) {
SpringApplication.run(GraphqlApplication.class, args);
}
@Bean
ApplicationRunner init(GreetingRepository greetingRepository) {
return args -> {
Stream.of("Hallo", "Guten Tag", "Moin").forEach(greeting -> greetingRepository.save(Greeting.builder().message(greeting).build()));
greetingRepository.findAll().forEach(System.out::println);
};
}
@Bean
public QueryResolver query() {
return new QueryResolver();
}
@Bean
public MutationResolver mutation() {
return new MutationResolver();
}
}
While trying to test the application again to see if I could run a query using GraphiQL, the application wouldn't start:
org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:155) ~[spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544) ~[spring-context-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:395) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1255) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1243) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at de.eno.prototyp.graphql.GraphqlApplication.main(GraphqlApplication.java:14) [classes/:na]
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:126) ~[spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:86) ~[spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:413) ~[spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:174) ~[spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:179) ~[spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:152) ~[spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
... 8 common frames omitted
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'graphQLServletRegistrationBean' defined in class path resource [com/oembedler/moon/graphql/boot/GraphQLWebAutoConfiguration.class]: Unsatisfied dependency expressed through method 'graphQLServletRegistrationBean' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'graphQLServlet' defined in class path resource [com/oembedler/moon/graphql/boot/GraphQLWebAutoConfiguration.class]: Unsatisfied dependency expressed through method 'graphQLServlet' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'graphQLSchemaProvider' defined in class path resource [com/oembedler/moon/graphql/boot/GraphQLWebAutoConfiguration.class]: Unsatisfied dependency expressed through method 'graphQLSchemaProvider' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'graphQLSchema' defined in class path resource [com/oembedler/moon/graphql/boot/GraphQLJavaToolsAutoConfiguration.class]: Unsatisfied dependency expressed through method 'graphQLSchema' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'schemaParser' defined in class path resource [com/oembedler/moon/graphql/boot/GraphQLJavaToolsAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.coxautodev.graphql.tools.SchemaParser]: Factory method 'schemaParser' threw exception; nested exception is com.coxautodev.graphql.tools.FieldResolverError: Found more than one matching resolver for field 'FieldDefinition{name='greetingsAll', type=ListType{type=TypeName{name='Greeting'}}, inputValueDefinitions=[], directives=[]}': [MethodFieldResolver{method=public java.lang.Iterable de.eno.prototyp.graphql.QueryResolver.getGreetingsAll()}, MethodFieldResolver{method=public java.lang.Iterable de.eno.prototyp.graphql.QueryResolver.getGreetingsAll()}]
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:732) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:474) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1256)
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'graphQLServlet' defined in class path resource [com/oembedler/moon/graphql/boot/GraphQLWebAutoConfiguration.class]: Unsatisfied dependency expressed through method 'graphQLServlet' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'graphQLSchemaProvider' defined in class path resource [com/oembedler/moon/graphql/boot/GraphQLWebAutoConfiguration.class]: Unsatisfied dependency expressed through method 'graphQLSchemaProvider' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'graphQLSchema' defined in class path resource [com/oembedler/moon/graphql/boot/GraphQLJavaToolsAutoConfiguration.class]: Unsatisfied dependency expressed through method 'graphQLSchema' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'schemaParser' defined in class path resource [com/oembedler/moon/graphql/boot/GraphQLJavaToolsAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.coxautodev.graphql.tools.SchemaParser]: Factory method 'schemaParser' threw exception; nested exception is com.coxautodev.graphql.tools.FieldResolverError: Found more than one matching resolver for field 'FieldDefinition{name='greetingsAll', type=ListType{type=TypeName{name='Greeting'}}, inputValueDefinitions=[], directives=[]}': [MethodFieldResolver{method=public java.lang.Iterable de.eno.prototyp.graphql.QueryResolver.getGreetingsAll()}, MethodFieldResolver{method=public java.lang.Iterable de.eno.prototyp.graphql.QueryResolver.getGreetingsAll()}]
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:732) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:474) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1256) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
... 24 common frames omitted
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'graphQLSchemaProvider' defined in class path resource [com/oembedler/moon/graphql/boot/GraphQLWebAutoConfiguration.class]: Unsatisfied dependency expressed through method 'graphQLSchemaProvider' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'graphQLSchema' defined in class path resource [com/oembedler/moon/graphql/boot/GraphQLJavaToolsAutoConfiguration.class]: Unsatisfied dependency expressed through method 'graphQLSchema' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'schemaParser' defined in class path resource [com/oembedler/moon/graphql/boot/GraphQLJavaToolsAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.coxautodev.graphql.tools.SchemaParser]: Factory method 'schemaParser' threw exception; nested exception is com.coxautodev.graphql.tools.FieldResolverError: Found more than one matching resolver for field 'FieldDefinition{name='greetingsAll', type=ListType{type=TypeName{name='Greeting'}}, inputValueDefinitions=[], directives=[]}': [MethodFieldResolver{method=public java.lang.Iterable de.eno.prototyp.graphql.QueryResolver.getGreetingsAll()}, MethodFieldResolver{method=public java.lang.Iterable de.eno.prototyp.graphql.QueryResolver.getGreetingsAll()}]
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:732) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:474) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1256) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
... 38 common frames omitted
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'graphQLSchema' defined in class path resource [com/oembedler/moon/graphql/boot/GraphQLJavaToolsAutoConfiguration.class]: Unsatisfied dependency expressed through method 'graphQLSchema' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'schemaParser' defined in class path resource [com/oembedler/moon/graphql/boot/GraphQLJavaToolsAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.coxautodev.graphql.tools.SchemaParser]: Factory method 'schemaParser' threw exception; nested exception is com.coxautodev.graphql.tools.FieldResolverError: Found more than one matching resolver for field 'FieldDefinition{name='greetingsAll', type=ListType{type=TypeName{name='Greeting'}}, inputValueDefinitions=[], directives=[]}': [MethodFieldResolver{method=public java.lang.Iterable de.eno.prototyp.graphql.QueryResolver.getGreetingsAll()}, MethodFieldResolver{method=public java.lang.Iterable de.eno.prototyp.graphql.QueryResolver.getGreetingsAll()}]
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:732) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:474)
... 52 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'schemaParser' defined in class path resource [com/oembedler/moon/graphql/boot/GraphQLJavaToolsAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.coxautodev.graphql.tools.SchemaParser]: Factory method 'schemaParser' threw exception; nested exception is com.coxautodev.graphql.tools.FieldResolverError: Found more than one matching resolver for field 'FieldDefinition{name='greetingsAll', type=ListType{type=TypeName{name='Greeting'}}, inputValueDefinitions=[], directives=[]}': [MethodFieldResolver{method=public java.lang.Iterable de.eno.prototyp.graphql.QueryResolver.getGreetingsAll()}, MethodFieldResolver{method=public java.lang.Iterable de.eno.prototyp.graphql.QueryResolver.getGreetingsAll()}]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:590) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1256)
... 66 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.coxautodev.graphql.tools.SchemaParser]: Factory method 'schemaParser' threw exception; nested exception is com.coxautodev.graphql.tools.FieldResolverError: Found more than one matching resolver for field 'FieldDefinition{name='greetingsAll', type=ListType{type=TypeName{name='Greeting'}}, inputValueDefinitions=[], directives=[]}': [MethodFieldResolver{method=public java.lang.Iterable de.eno.prototyp.graphql.QueryResolver.getGreetingsAll()}, MethodFieldResolver{method=public java.lang.Iterable de.eno.prototyp.graphql.QueryResolver.getGreetingsAll()}]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:582) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
... 79 common frames omitted
Caused by: com.coxautodev.graphql.tools.FieldResolverError: Found more than one matching resolver for field 'FieldDefinition{name='greetingsAll', type=ListType{type=TypeName{name='Greeting'}}, inputValueDefinitions=[], directives=[]}': [MethodFieldResolver{method=public java.lang.Iterable de.eno.prototyp.graphql.QueryResolver.getGreetingsAll()}, MethodFieldResolver{method=public java.lang.Iterable de.eno.prototyp.graphql.QueryResolver.getGreetingsAll()}]
at com.coxautodev.graphql.tools.FieldResolverScanner.findFieldResolver(FieldResolverScanner.kt:39) ~[graphql-java-tools-5.2.0.jar:na]
at com.coxautodev.graphql.tools.SchemaClassScanner.scanResolverInfoForPotentialMatches(SchemaClassScanner.kt:227) ~[graphql-java-tools-5.2.0.jar:na]
at com.coxautodev.graphql.tools.SchemaClassScanner.handleRootType(SchemaClassScanner.kt:122) ~[graphql-java-tools-5.2.0.jar:na]
at com.coxautodev.graphql.tools.SchemaClassScanner.scanForClasses(SchemaClassScanner.kt:80) ~[graphql-java-tools-5.2.0.jar:na]
at com.coxautodev.graphql.tools.SchemaParserBuilder.scan(SchemaParserBuilder.kt:150) ~[graphql-java-tools-5.2.0.jar:na]
at com.coxautodev.graphql.tools.SchemaParserBuilder.build(SchemaParserBuilder.kt:156) ~[graphql-java-tools-5.2.0.jar:na]
at com.oembedler.moon.graphql.boot.GraphQLJavaToolsAutoConfiguration.schemaParser(GraphQLJavaToolsAutoConfiguration.java:65) ~[graphql-spring-boot-autoconfigure-4.3.0.jar:na]
So I don't know what happened but I think GraphQL can not map the Query
type to the QueryResolver
. But why?
When checking the internet, I read that Spring Boot Version is the reason. So I tested it with Spring Boot 1.5.8.RELEASE, without result.
However, when using an older GraphQL version (4.3.0 and 5.2.0) with Spring boot 1.5.8, it did seem to work fine. So then I tried to use these older GraphQL versions with the new Spring boot version, but then I get another exception:
2018-07-13 14:45:57.666 INFO 12872 --- [io-8080-exec-10] graphql.servlet.GraphQLServlet : Bad POST request: parsing failed
java.lang.IllegalStateException: Unable to process parts as no multi-part configuration has been provided
at org.apache.catalina.connector.Request.parseParts(Request.java:2826) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.connector.Request.getParts(Request.java:2793) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at org.apache.catalina.connector.RequestFacade.getParts(RequestFacade.java:1084) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at graphql.servlet.GraphQLServlet.lambda$new$2(GraphQLServlet.java:129) ~[graphql-java-servlet-5.1.0.jar:na]
at graphql.servlet.GraphQLServlet.doRequest(GraphQLServlet.java:260) ~[graphql-java-servlet-5.1.0.jar:na]
at graphql.servlet.GraphQLServlet.doPost(GraphQLServlet.java:278) ~[graphql-java-servlet-5.1.0.jar:na]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:661) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
Now I'm really screwed up because of this incompatibility. I want to use the new versions of all libraries. Does anybody have a solution?
You're creating your resolver beans twice. Both your MutationResolver
and QueryResolver
are annotated with @Component
, which means that Spring will create an instance and register it. However, within the GraphqlApplication
you also created beans for both resolvers using the @Bean
annotation.
This causes an issue, because the GraphQL library will look for a proper resolver for greetingsAll
, but it will find two resolvers due to your bean being mapped twice.
The solution is to either remove the @Component
annotation, or to remove the following bean configuration:
@Bean
public QueryResolver query() {
return new QueryResolver();
}
@Bean
public MutationResolver mutation() {
return new MutationResolver();
}