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I'm having a problem with finding an array or list size using Stefan Goessner's JsonPath. I'm using the version json-path-2.0.0.
My jsonpath expression is $.orders.length and JSON looks something like this:
{ "orders" : [ ... ] }Its failing with the following error:
com.jayway.jsonpath.PathNotFoundException: Property ['length'] not found in path $['orders'] And I tried with $.orders.length() too which is again failing with the below error:
com.jayway.jsonpath.PathNotFoundException: Property ['length()'] not found in path $['orders']
Please suggest me how to get the length of the array using Goessner's JsonPath expression.
[EDIT] Following is how I'm obtaining the configuration:
com.jayway.jsonpath.Configuration conf = com.jayway.jsonpath.Configuration.defaultConfiguration().addOptions(Option.DEFAULT_PATH_LEAF_TO_NULL); DocumentContext documentContext = JsonPath.using(conf).parse(orderJson); Object val = documentContext.read(jsonPathExpression); 
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JsonPath expressions always refer to a JSON structure in the same way as XPath expression are used in combination with an XML document. The "root member object" in JsonPath is always referred to as $ regardless if it is an object or array. JsonPath expressions can use the dot–notation.
JSONPath is a query language for JSON, similar to XPath for XML. XPath expression can be used to extract information from an XML document by evaluating given expression.
JSONPath creates a uniform standard and syntax to define different parts of a JSON document. JSONPath defines expressions to traverse through a JSON document to reach to a subset of the JSON. This topic is best understood by seeing it in action. We have created a web page which can help you evaluate a JSONPath.
It seems that support for returning the length() of an array was only added in version 2.1.0 of the jayway json-path library.
Based on some quick tests, the $.orders.length() expression seems to work with both version 2.1.0 and version 2.2.0, so I think you just need to upgrade your dependency version in order to fix the error you are seeing.
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