graphql-java-tools

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When I write this code:

public class Ab implements GraphQLQueryResolver {
@Data
@NoArgsConstructor
public static class A<T> {
        private T e;
}

public ... find(A<B> c) {
        return ...
}

}

I have the exception below:

Caused by: java.lang.ClassCastException: sun.reflect.generics.reflectiveObjects.TypeVariableImpl cannot be cast to java.lang.Class at com.coxautodev.graphql.tools.UtilsKt.unwrap(Utils.kt:34) at com.coxautodev.graphql.tools.GenericType$RelativeTo.parameterizedDeclaringTypeOrSuperType(GenericType.kt:116) at com.coxautodev.graphql.tools.GenericType$RelativeTo.unwrapGenericType(GenericType.kt:98) at com.coxautodev.graphql.tools.TypeClassMatcher.match(TypeClassMatcher.kt:34) at com.coxautodev.graphql.tools.TypeClassMatcher.match(TypeClassMatcher.kt:28) at com.coxautodev.graphql.tools.SchemaClassScanner.handleNewType(SchemaClassScanner.kt:348) at com.coxautodev.graphql.tools.SchemaClassScanner.handleFoundType(SchemaClassScanner.kt:328) at com.coxautodev.graphql.tools.SchemaClassScanner.handleFoundType(SchemaClassScanner.kt:293) at com.coxautodev.graphql.tools.SchemaClassScanner.scanResolverInfoForPotentialMatches(SchemaClassScanner.kt:268) at com.coxautodev.graphql.tools.SchemaClassScanner.handleRootType(SchemaClassScanner.kt:119) at com.coxautodev.graphql.tools.SchemaClassScanner.scanForClasses(SchemaClassScanner.kt:77) at com.coxautodev.graphql.tools.SchemaParserBuilder.scan(SchemaParserBuilder.kt:165) at com.coxautodev.graphql.tools.SchemaParserBuilder.build(SchemaParserBuilder.kt:206) at com.oembedler.moon.graphql.boot.GraphQLJavaToolsAutoConfiguration.schemaParser(GraphQLJavaToolsAutoConfiguration.java:98) at com.oembedler.moon.graphql.boot.GraphQLJavaToolsAutoConfiguration$$EnhancerBySpringCGLIB$$3d1621d9.CGLIB$schemaParser$0() at com.oembedler.moon.graphql.boot.GraphQLJavaToolsAutoConfiguration$$EnhancerBySpringCGLIB$$3d1621d9$$FastClassBySpringCGLIB$$a377c22.invoke()

I don't understand why Could you help me ? Thanks