那些遇到过的问题

GraphQL和Spring Boot 2.0.3

Jon*_*lff 6 java spring-boot graphql graphql-java graphiql

我想为将来的项目测试GraphQL。该项目将使用Spring Boot，Spring Security和GraphQL。因此，我使用Spring Initializr中的构建在IntelliJ中创建了一个新的Spring Boot App。当然，Spring Boot版本是最新的（2.0.3.RELEASE）现在，我添加了GraphQL和GraphiQL的依赖项。

<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>
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为了对此进行测试，我运行了该应用程序，但没有/graphql端点。在这种情况下，我application.properties毫无问题地对其进行了配置：

# 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
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再次测试之后，端点就在那里了，所以现在我可以编写模式，解析器等了。这是我实现的：

架构：

schema {
    query: Query
    mutation: Mutation
}

type Greeting {
    id: ID!
    message: String!
}

type Query {
    greetingsAll: [Greeting]
}

type Mutation {
    greeting(message: String!): Greeting
}
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模型：

@NoArgsConstructor
@AllArgsConstructor
@Getter
@Setter
@Builder
@ToString
@Entity
public class Greeting {
    @Id
    @GeneratedValue
    private Long id;
    private String message;
}
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资料库

@Repository
public interface GreetingRepository extends JpaRepository<Greeting, Long> {
}
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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();
    }
}
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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);
    }
}
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SpringBoot Bean

@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();
    }
}
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在尝试再次测试应用程序以查看是否可以使用GraphiQL运行查询时，该应用程序无法启动：

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]
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所以我不知道发生了什么，但是我认为GraphQL无法将Query类型映射到QueryResolver。但为什么？

检查Internet时，我读到Spring Boot版本是原因。所以我用Spring Boot 1.5.8.RELEASE测试了它，但是没有结果。

但是，当在Spring Boot 1.5.8中使用较旧的GraphQL版本（4.3.0和5.2.0）时，它确实可以正常工作。因此，我尝试将这些较旧的GraphQL版本与新的Spring引导版本一起使用，但是随后出现另一个异常：

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-servle

g00*_*00b 5

您将两次创建解析器bean。无论你MutationResolver和QueryResolver与被注释@Component，这意味着春天将创建一个实例，并注册。但是，GraphqlApplication您还使用@Bean注释为两个解析器创建了bean 。

这会引起问题，因为GraphQL库将为寻找合适的解析器greetingsAll，但是由于将bean映射两次，它将找到两个解析器。

解决方案是删除@Component注释，或删除以下bean配置：

@Bean
public QueryResolver query() {
    return new QueryResolver();
}

@Bean
public MutationResolver mutation() {
    return new MutationResolver();
}
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