I get error that is Function with name: first does not exist.

[lush-99]

my code

        ReadContext rct = JsonPath.parse(JsonUtil.getJsonByFileUtils(rateJsonFilePath));
        Object data = rct.read("$.data.items");
        log.info("data:{}", data);
        Object first = rct.read("$.data.items.first()");
        log.info("first:{}", first);

print

02:08:58.437 [main] DEBUG com.jayway.jsonpath.internal.path.CompiledPath - Evaluating path: $['data']['items']
02:08:58.437 [main] INFO com.example.demo.jsontest.JsonTest - data:[{"id":1,"app_local":"ff","tax_rate":10,"basic_rate":15.5,"expected_profit_rate":10,"update_user":"yyyyyy","update_time":1669819482},{"id":1,"app_local":"rr","tax_rate":10,"basic_rate":15.5,"expected_profit_rate":10,"update_user":"wxxxxxx","update_time":1669819482}]
02:08:58.437 [main] DEBUG com.jayway.jsonpath.internal.path.CompiledPath - Evaluating path: $['data']['items'].first()
Exception in thread "main" java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.intellij.rt.execution.CommandLineWrapper.main(CommandLineWrapper.java:64)
Caused by: com.jayway.jsonpath.InvalidPathException: Function with name: first does not exist.
	at com.jayway.jsonpath.internal.function.PathFunctionFactory.newFunction(PathFunctionFactory.java:71)
	at com.jayway.jsonpath.internal.path.FunctionPathToken.evaluate(FunctionPathToken.java:38)
	at com.jayway.jsonpath.internal.path.PathToken.handleObjectProperty(PathToken.java:90)
	at com.jayway.jsonpath.internal.path.PropertyPathToken.evaluate(PropertyPathToken.java:80)
	at com.jayway.jsonpath.internal.path.PathToken.handleObjectProperty(PathToken.java:90)
	at com.jayway.jsonpath.internal.path.PropertyPathToken.evaluate(PropertyPathToken.java:80)
	at com.jayway.jsonpath.internal.path.RootPathToken.evaluate(RootPathToken.java:66)
	at com.jayway.jsonpath.internal.path.CompiledPath.evaluate(CompiledPath.java:99)
	at com.jayway.jsonpath.internal.path.CompiledPath.evaluate(CompiledPath.java:107)
	at com.jayway.jsonpath.JsonPath.read(JsonPath.java:179)
	at com.jayway.jsonpath.internal.JsonContext.read(JsonContext.java:88)
	at com.jayway.jsonpath.internal.JsonContext.read(JsonContext.java:77)
	at com.example.demo.jsontest.JsonTest.main(JsonTest.java:58)
	... 5 more

the data is:

[
      {
        "id": 1,
        "app_local": "ff",
        "tax_rate": 10,
        "basic_rate": 15.5,
        "expected_profit_rate": 10,
        "update_user": "yyyyyy",
        "update_time": 1669819482
      },
      {
        "id": 1,
        "app_local": "rr",
        "tax_rate": 10,
        "basic_rate": 15.5,
        "expected_profit_rate": 10,
        "update_user": "wxxxxxx",
        "update_time": 1669819482
      }
    ]

[iblislin]

I think the first() function is still not available in v2.7.0

[harry77914]

Should we remove it from documenation, Its misleading

[lush-99]

yes, i think so