运行时异常
如果遇到某些异常情况，graphql引擎可以引发运行时异常。以下是可以在graphql.execute（…）调用中抛出的异常列表。
这些不是执行中的graphql错误，而是执行graphql查询的完全不可接受的条件。
graphql.schema.CoercingSerializeException
原文：is thrown when a value cannot be serialised by a Scalar type, for example a String value being coerced as an Int.
翻译：当值不能由标量类型序列化时抛出，例如字符串值被强制为Int。
graphql.schema.CoercingParseValueException
原文：is thrown when a value cannot be parsed by a Scalar type, for example a String input value being parsed as an Int.
翻译：当值不能由标量类型解析时抛出，例如，字符串输入值被解析为Int。
graphql.execution.UnresolvedTypeException
原文：is thrown if a
graphql.schema.TypeResolver
fails to provide a concrete object type given a interface or union type.
翻译：如果是graphql.schema，则抛出。TypeResolver无法提供给定接口或联合类型的具体对象类型。
graphql.execution.NonNullableValueCoercedAsNullException
原文：is thrown if a non null variable argument is coerced as a null value during execution.
翻译：如果在执行期间将非空变量参数强制为空值，则引发。
graphql.execution.InputMapDefinesTooManyFieldsException
原文：is thrown if a map used for an input type object contains more keys than is defined in that input type.
翻译：如果用于输入类型对象的映射包含的键多于该输入类型中定义的键，则引发。
graphql.schema.validation.InvalidSchemaException
原文：is thrown if the schema is not valid when built via > graphql.schema.GraphQLSchema.Builder#build()
graphql.execution.UnknownOperationException
原文：if multiple operations are defined in the query and the operation name is missing or there is no matching operation name contained in the GraphQL query.
翻译：如果查询中定义了多个操作，并且缺少操作名，或者GraphQL查询中没有包含匹配的操作名。
graphql.GraphQLException
原文：is thrown as a general purpose runtime exception, for example if the code cant access a named field when examining a POJO, it is analogous to a RuntimeException if you will.
翻译：作为通用运行时异常抛出，例如，如果代码在检查POJO时无法访问命名字段，则类似于运行时异常。
graphql.AssertException
原文：is thrown as a low level code assertion exception for truly unexpected code conditions, things we assert should never happen in practice.
翻译：对于真正意外的代码条件，作为低级代码断言异常抛出，我们断言的事情在实践中永远不会发生。