Unable to match type definition for scalar type Long, after upgrading to 14.0.0

[ghoshrahul]

Hi

In my project, I was using the graphql-spring-boot-starter v5.8.1, and am trying to upgrade to the latest version 14.0.0. As per the documentation, the project is now using the BOM structure. So I have removed the other dependencies related to graphql-spring-boot-starter

When I try to start the server, I get the following error:-

Caused by: graphql.kickstart.tools.SchemaClassScannerError: Unable to match type definition (NonNullType{type=TypeName{name='Long'}}) for reference return type of method public java.lang.Long com.bizom.login.graphql.types.AuthResponse.getTokenExpiry() with java type (class java.lang.Long): No TypeDefinition for type name Long
	at graphql.kickstart.tools.TypeClassMatcher.error(TypeClassMatcher.kt:20)
	at graphql.kickstart.tools.TypeClassMatcher.match(TypeClassMatcher.kt:81)
	at graphql.kickstart.tools.TypeClassMatcher.match$default(TypeClassMatcher.kt:26)
	at graphql.kickstart.tools.TypeClassMatcher.match(TypeClassMatcher.kt:65)
	at graphql.kickstart.tools.TypeClassMatcher.match(TypeClassMatcher.kt:23)
	at graphql.kickstart.tools.SchemaClassScanner.scanResolverInfoForPotentialMatches(SchemaClassScanner.kt:278)
	at graphql.kickstart.tools.SchemaClassScanner.scanQueueItemForPotentialMatches(SchemaClassScanner.kt:268)
	at graphql.kickstart.tools.SchemaClassScanner.scanQueue(SchemaClassScanner.kt:115)
	at graphql.kickstart.tools.SchemaClassScanner.scanForClasses(SchemaClassScanner.kt:76)
	at graphql.kickstart.tools.SchemaParserBuilder.scan(SchemaParserBuilder.kt:156)
	at graphql.kickstart.tools.SchemaParserBuilder.build(SchemaParserBuilder.kt:200)
	at graphql.kickstart.autoconfigure.tools.GraphQLJavaToolsAutoConfiguration.schemaParser(GraphQLJavaToolsAutoConfiguration.java:129)
	at graphql.kickstart.autoconfigure.tools.GraphQLJavaToolsAutoConfiguration$$EnhancerBySpringCGLIB$$ddf70306.CGLIB$schemaParser$0(<generated>)
	at graphql.kickstart.autoconfigure.tools.GraphQLJavaToolsAutoConfiguration$$EnhancerBySpringCGLIB$$ddf70306$$FastClassBySpringCGLIB$$c396253d.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)
	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:331)
	at graphql.kickstart.autoconfigure.tools.GraphQLJavaToolsAutoConfiguration$$EnhancerBySpringCGLIB$$ddf70306.schemaParser(<generated>)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)

Dependency is as follows:-

<dependency>
                <groupId>com.graphql-java-kickstart</groupId>
                <artifactId>graphql-spring-boot-starter</artifactId>
                <version>${spring-graphql-starter.version}</version>
            </dependency>

Here the spring-graphql-starter.version is pointing to 14.0.0.

There is no external configuration setup, which means it should be taking the default configuration. I'm unsure as to why this is not working. The kotlin version is 1.7.10. Please let me know if I have missed something?

Let me know if any information is required.

[oliemansm]

These non default scalars have been removed from core graphql-java library in one of the intermediate versions and have been moved to the graphql-java-extended-scalars package. To use it you have to add that dependency:

<dependency>
  <groupId>com.graphql-java</groupId>
  <artifactId>graphql-java-extended-scalars</artifactId>
  <version>18.1</version>
</dependency>

Add the scalar definition to your GraphQL schema file:

scalar Long

And expose the Long scalar provided by the graphql-java-extended-scalars library as a Spring Bean in one of your configuration classes:

import static graphql.scalars.ExtendedScalars.GraphQLLong;

import graphql.schema.GraphQLScalarType;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
class GraphQLScalarConfiguration {
  @Bean
  GraphQLScalarType longScalar() {
    return GraphQLLong;
  }
}

[ghoshrahul]

Will the graphql-java-extended-scalars package not be included with the graphql-spring-boot-starter? Because when I freshly install, all those packages are downloaded. When I run the mvn:dependency-tree, I get the following:-

[INFO] com.bizom.access:access-module:jar:2.0.0 [INFO] \- com.graphql-java-kickstart:graphql-spring-boot-starter:jar:14.0.0:compile [INFO] \- com.graphql-java-kickstart:graphql-spring-boot-autoconfigure:jar:14.0.0:compile [INFO] +- com.graphql-java:graphql-java-extended-scalars:jar:18.1:compile [INFO] \- com.graphql-java:graphql-java:jar:19.1:compile [INFO] \- com.graphql-java:java-dataloader:jar:3.2.0:compile

So maybe it's only for compilation, that the extended scalar is used? But not during the runtime?

[ghoshrahul]

Also, another thing to notice is that I had previously not defined the scalar Long on the graphqls file, but now it's required. Why is that?

[oliemansm]

Should be only for compilation, not runtime. You could try that out easily of course.

Reason for having to define the scalar manually is because they removed support for these non standard scalars from the core lib like I said.

[ghoshrahul]

I have added the scalar Long definition in the required graphqls files and have exposed the GraphQLLong class as well.

Without adding the graphql-java-extended-scalars library explicitly, I am able to get the server up and running. This is slightly unexpected as I understood that the dependency will only be used at compile time, but not run-time.

Marking this as completed and answered. Thanks @oliemansm !