Upgrade from 5.4 to 16.1

[vyj7]

I have been trying to upgrade from graphql-spring-boot from version 5.4 to 16.1 (Don't ask why so delay :-().
So I am facing issues. So it uses java-graphql tools 16.1 which has Long scalar support out of the box . But I am receving the following error:

ANTLR Tool version 4.8 used for code generation does not match the current runtime version 4.7.2ANTLR Runtime version 4.8 used for parser compilation does not match the current runtime version 4.7.2ANTLR Tool version 4.8 used for code generation does not match the current runtime version 4.7.2ANTLR Runtime version 4.8 used for parser compilation does not match the current runtime version 
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22:58:10.139 |  WARN | o.s.b.w.s.c.AnnotationConfigServletWebServerApplicationContext | Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is java.lang.RuntimeException: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'graphQLServletRegistrationBean' defined in class path resource [graphql/kickstart/spring/web/boot/GraphQLWebAutoConfiguration.class]: Unsatisfied dependency expressed through method 'graphQLServletRegistrationBean' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'BaseServlet' defined in file
Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'graphQLSchema' defined in class path resource [graphql/kickstart/tools/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 [graphql/kickstart/tools/boot/GraphQLJavaToolsAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [graphql.kickstart.tools.SchemaParser]: Factory method 'schemaParser' threw exception; nested exception is graphql.kickstart.tools.SchemaClassScannerError: Expected a user-defined GraphQL scalar type with name 'Long' but found none!

[setchy]

Already answered in #532