Counter in Java JsonPath expression

Question

I am trying to use counter in JSON Path expression and getting JSONPath error java.lang.numberFormatException

    for (int counter = 0; counter < ids.size(); counter++) {
        tmp_rules = JsonPath.read(jsonFile, "$..orders[counter].rule");
        for (int counter2 = 0; counter2 < tmp_rules.size();counter2++){
            if (
                    (JsonPath.read(jsonFile, "$..orders[counter].rule[counter2]") == 1) &&
                    (JsonPath.read(jsonFile, "$..orders[counter].asked[counter2]")) != 0) {
                       end_id.add(JsonPath.read(jsonFile, "$..id[counter]"));
                       end_rule.add(JsonPath.read(jsonFile, "$..orders[counter].rule[counter2]"));
                       end_asked.add(JsonPath.read(jsonFile,"$..orders[counter].asked[counter2]"));
            }
        }
    }

Answer 1

Your JSON path expressions are not valid, since you use counter and counter2 strings as indexing arrays. You should rather use the values of your loop variables in the path expressions:

for (int counter = 0; counter < ids.size(); counter++) {
    tmp_rules = JsonPath.read(jsonFile, "$..orders[" + counter + "].rule");
    for (int counter2 = 0; counter2 < tmp_rules.size();counter2++){
        if (
                (JsonPath.read(jsonFile, "$..orders[" + counter + "].rule[" + counter2 + "]") == 1) &&
                (JsonPath.read(jsonFile, "$..orders[" + counter + "].asked[" + counter2 + "]")) != 0) {
                   end_id.add(JsonPath.read(jsonFile, "$..id[" + counter + "]"));
                   end_rule.add(JsonPath.read(jsonFile, "$..orders[" + counter + "].rule[" + counter2 + "]"));
                   end_asked.add(JsonPath.read(jsonFile,"$..orders[" + counter + "].asked[" + counter2 + "]"));
        }
    }
}