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

import graphql.Internal;
import graphql.language.IntValue;
import graphql.language.StringValue;
import graphql.schema.Coercing;
import graphql.schema.CoercingParseLiteralException;
import graphql.schema.CoercingParseValueException;
import graphql.schema.CoercingSerializeException;

import java.math.BigDecimal;
import java.math.BigInteger;

import static graphql.scalar.CoercingUtil.isNumberIsh;
import static graphql.scalar.CoercingUtil.typeName;

@Internal
public class GraphqlLongCoercing implements Coercing {

    private static final BigInteger LONG_MAX = BigInteger.valueOf(Long.MAX_VALUE);
    private static final BigInteger LONG_MIN = BigInteger.valueOf(Long.MIN_VALUE);

    private Long convertImpl(Object input) {
        if (input instanceof Long) {
            return (Long) input;
        } else if (isNumberIsh(input)) {
            BigDecimal value;
            try {
                value = new BigDecimal(input.toString());
            } catch (NumberFormatException e) {
                return null;
            }
            try {
                return value.longValueExact();
            } catch (ArithmeticException e) {
                return null;
            }
        } else {
            return null;
        }

    }

    @Override
    public Long serialize(Object input) {
        Long result = convertImpl(input);
        if (result == null) {
            throw new CoercingSerializeException(
                    "Expected type 'Long' but was '" + typeName(input) + "'."
            );
        }
        return result;
    }

    @Override
    public Long parseValue(Object input) {
        Long result = convertImpl(input);
        if (result == null) {
            throw new CoercingParseValueException(
                    "Expected type 'Long' but was '" + typeName(input) + "'."
            );
        }
        return result;
    }

    @Override
    public Long parseLiteral(Object input) {
        if (input instanceof StringValue) {
            try {
                return Long.parseLong(((StringValue) input).getValue());
            } catch (NumberFormatException e) {
                throw new CoercingParseLiteralException(
                        "Expected value to be a Long but it was '" + input + "'"
                );
            }
        } else if (input instanceof IntValue) {
            BigInteger value = ((IntValue) input).getValue();
            if (value.compareTo(LONG_MIN) < 0 || value.compareTo(LONG_MAX) > 0) {
                throw new CoercingParseLiteralException(
                        "Expected value to be in the Long range but it was '" + value.toString() + "'"
                );
            }
            return value.longValue();
        }
        throw new CoercingParseLiteralException(
                "Expected AST type 'IntValue' or 'StringValue' but was '" + typeName(input) + "'."
        );
    }
}