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GraphqL Java
There is a newer version: 230521-nf-execution
package graphql.execution.nextgen.result;

import graphql.Assert;
import graphql.GraphQLError;
import graphql.Internal;
import graphql.execution.MergedField;
import graphql.execution.NonNullableFieldWasNullException;
import graphql.execution.nextgen.FetchedValueAnalysis;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

import static graphql.Assert.assertNotNull;

@Internal
public abstract class ExecutionResultNode {

    private final FetchedValueAnalysis fetchedValueAnalysis;
    private final NonNullableFieldWasNullException nonNullableFieldWasNullException;
    private final List children;
    private final List errors;

    protected ExecutionResultNode(FetchedValueAnalysis fetchedValueAnalysis,
                                  NonNullableFieldWasNullException nonNullableFieldWasNullException,
                                  List children,
                                  List errors) {
        this.fetchedValueAnalysis = fetchedValueAnalysis;
        this.nonNullableFieldWasNullException = nonNullableFieldWasNullException;
        this.children = assertNotNull(children);
        children.forEach(Assert::assertNotNull);
        this.errors = new ArrayList<>(errors);
    }

    public List getErrors() {
        return new ArrayList<>(errors);
    }

    /*
     * can be null for the RootExecutionResultNode
     */
    public FetchedValueAnalysis getFetchedValueAnalysis() {
        return fetchedValueAnalysis;
    }

    public MergedField getMergedField() {
        return fetchedValueAnalysis.getExecutionStepInfo().getField();
    }

    public NonNullableFieldWasNullException getNonNullableFieldWasNullException() {
        return nonNullableFieldWasNullException;
    }

    public List getChildren() {
        return new ArrayList<>(this.children);
    }

    public Optional getChildNonNullableException() {
        return children.stream()
                .filter(executionResultNode -> executionResultNode.getNonNullableFieldWasNullException() != null)
                .map(ExecutionResultNode::getNonNullableFieldWasNullException)
                .findFirst();
    }

    /**
     * Creates a new ExecutionResultNode of the same specific type with the new set of result children
     *
     * @param children the new children for this result node
     *
     * @return a new ExecutionResultNode with the new result children
     */
    public abstract ExecutionResultNode withNewChildren(List children);

    /**
     * Creates a new ExecutionResultNode of the same specific type with the new {@link graphql.execution.nextgen.FetchedValueAnalysis}
     *
     * @param fetchedValueAnalysis the {@link graphql.execution.nextgen.FetchedValueAnalysis} for this result node
     *
     * @return a new ExecutionResultNode with the new {@link graphql.execution.nextgen.FetchedValueAnalysis}
     */
    public abstract ExecutionResultNode withNewFetchedValueAnalysis(FetchedValueAnalysis fetchedValueAnalysis);

    /**
     * Creates a new ExecutionResultNode of the same specific type with the new error collection
     *
     * @param errors the new errors for this result node
     *
     * @return a new ExecutionResultNode with the new errors
     */
    public abstract ExecutionResultNode withNewErrors(List errors);
}