NonNullableValueCoercedAsNullException being thrown in QueryTraversal #2761
Description
Discussed in #2760
Originally posted by slisaasquatch March 12, 2022
I'm seeing random NonNullableValueCoercedAsNullExceptions from our servers running graphql-java 17.3 with graphql-java-tools 12.0.2. I've logged the entire GraphQL query, variables, and operation name, and I cannot reproduce the exception. The stack trace looks like this:
graphql.execution.NonNullableValueCoercedAsNullException: Field '' has coerced Null value for NonNull type 'String!'
at graphql.execution.ValuesResolver.externalValueToInternalValue(ValuesResolver.java:493)
at graphql.execution.ValuesResolver.lambda$externalValueToInternalValueForList$2(ValuesResolver.java:604)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1384)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:566)
at graphql.execution.ValuesResolver.externalValueToInternalValueForList(ValuesResolver.java:605)
at graphql.execution.ValuesResolver.externalValueToInternalValue(ValuesResolver.java:507)
at graphql.execution.ValuesResolver.externalValueToInternalValueForObject(ValuesResolver.java:570)
at graphql.execution.ValuesResolver.externalValueToInternalValue(ValuesResolver.java:510)
at graphql.execution.ValuesResolver.externalValueToInternalValue(ValuesResolver.java:491)
at graphql.execution.ValuesResolver.externalValueToInternalValueForVariables(ValuesResolver.java:412)
at graphql.execution.ValuesResolver.coerceVariableValues(ValuesResolver.java:94)
at graphql.analysis.QueryTraverser.coerceVariables(QueryTraverser.java:64)
at graphql.analysis.QueryTraverser.<init>(QueryTraverser.java:60)
at graphql.analysis.QueryTraverser.<init>(QueryTraverser.java:40)
at graphql.analysis.QueryTraverser$Builder.build(QueryTraverser.java:297)
at graphql.analysis.MaxQueryDepthInstrumentation.newQueryTraverser(MaxQueryDepthInstrumentation.java:92)
at graphql.analysis.MaxQueryDepthInstrumentation.lambda$beginValidation$2(MaxQueryDepthInstrumentation.java:57)
at graphql.execution.instrumentation.SimpleInstrumentationContext.onCompleted(SimpleInstrumentationContext.java:51)
at graphql.execution.instrumentation.ChainedInstrumentation$ChainedInstrumentationContext.lambda$onCompleted$1(ChainedInstrumentation.java:238)
at graphql.com.google.common.collect.ImmutableList.forEach(ImmutableList.java:405)
at graphql.execution.instrumentation.ChainedInstrumentation$ChainedInstrumentationContext.onCompleted(ChainedInstrumentation.java:238)
at graphql.GraphQL.validate(GraphQL.java:600)
at graphql.GraphQL.parseAndValidate(GraphQL.java:562)
at graphql.GraphQL.lambda$parseValidateAndExecute$10(GraphQL.java:531)
at graphql.execution.preparsed.NoOpPreparsedDocumentProvider.getDocument(NoOpPreparsedDocumentProvider.java:15)
at graphql.GraphQL.parseValidateAndExecute(GraphQL.java:533)
at graphql.GraphQL.executeAsync(GraphQL.java:502)
Can someone please give me some general directions on what the error means?
I know if I put a null inside an array that requires non null values in variables, I can cause an error with the same error message. However, if you look at the stack trace, the exception was thrown at graphql.GraphQL.executeAsync, meaning I'm not even getting a result from it.
Also for the record, this is what my variables looks like:
{
"accountId": "133...63",
"userId": "133...63",
"userInput": {
"accountId": "133...63",
"id": "133...63"
}
}I do not have arrays or nulls in my variables.