Rest-assured: JsonException when parsing single value JSON

[acheaito]

According to RFC 7159, "A JSON text is a sequence of tokens. The set of tokens includes six structural characters, strings, numbers, and three literal names."
As such, TRUE, FALSE, NULL, Strings, and numbers should be acceptable JSON even if the response does not start with { or [. For example, a RESTFul response of false is valid JSON.

However, RestAssured fails when parsing such single token JSON responses. Below is the exception trace:

groovy.json.JsonException: A JSON payload should start with an openning curly brace '{' or an openning square bracket '['.
Instead, 'false' was found on line: 1, column: 1
       at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
       at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
       at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
       at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
       at org.codehaus.groovy.reflection.CachedConstructor.invoke(CachedConstructor.java:83)
       at org.codehaus.groovy.runtime.callsite.ConstructorSite$ConstructorSiteNoUnwrapNoCoerce.callConstructor(ConstructorSite.java:105)
       at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callConstructor(AbstractCallSite.java:247)
       at io.restassured.internal.path.json.ConfigurableJsonSlurper.parse(ConfigurableJsonSlurper.groovy:114)
       at io.restassured.internal.path.json.ConfigurableJsonSlurper$parse.callCurrent(Unknown Source)
       at io.restassured.internal.path.json.ConfigurableJsonSlurper.parseText(ConfigurableJsonSlurper.groovy:83)
       at 

[johanhaleby]

REST Assured is using an old json parser (JsonSlurper) from Groovy. I tried the new one and then it works but then I get a lot of other tests that fails. Need to look into it more. Thanks for pointing out, I actually didn't know this.

[nikolmarku]

Hi, How to setup new parser? Any progress on this ?

[johanhaleby]

Unfortunately not. It's much harder to use the new JsonSlurper since (from what I remember when I tried to implement this) it doesn't provide hooks to modify it's behavior (which we need to do in order to convert BigDecimals to floats/doubles). The only option that I can think of right now is to essentially copy most of the Groovy code into REST Assured. And this is not something that I'm particularly keen on doing.

[rfftrifork]

Any news on this issue? I would consider it a rather essential bug if the framework doesn't parse json correctly, which is basically the case. Would it by any chance be possible to get a workaround at least?

[johanhaleby]

@rfftrifork Unfortunately still no updates. You could use any json parser that you like though by either by using object mapping or manually:

InputStream is = when().get("/json").asInputStream();
MyJsonLibrary myJsonLib = MyJsonLibrary(is); 
...

[shan-github-project]

`
io.restassured.path.json.exception.JsonPathException: Failed to parse the JSON document
at io.restassured.path.json.JsonPath$ExceptionCatcher.invoke(JsonPath.java:1002)
at io.restassured.path.json.JsonPath$4.doParseWith(JsonPath.java:967)
at io.restassured.path.json.JsonPath$JsonParser.parseWith(JsonPath.java:1047)
at io.restassured.path.json.JsonPath.get(JsonPath.java:202)
at files.DynamicJson.addbook(DynamicJson.java:23)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:124)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:583)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:719)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:989)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
at org.testng.TestRunner.privateRun(TestRunner.java:648)
at org.testng.TestRunner.run(TestRunner.java:505)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:455)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:450)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:415)
at org.testng.SuiteRunner.run(SuiteRunner.java:364)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:84)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1208)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1137)
at org.testng.TestNG.runSuites(TestNG.java:1049)
at org.testng.TestNG.run(TestNG.java:1017)
at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:114)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:251)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:77)

Caused by: groovy.json.JsonException: Lexing failed on line: 1, column: 1, while reading '<', no possible valid JSON value or punctuation could be recognized.
at groovy.json.JsonLexer.nextToken(JsonLexer.java:86)
at groovy.json.JsonLexer$nextToken.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:130)
at io.restassured.internal.path.json.ConfigurableJsonSlurper.parse(ConfigurableJsonSlurper.groovy:97)
at io.restassured.internal.path.json.ConfigurableJsonSlurper$parse.callCurrent(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:51)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:171)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:185)
at io.restassured.internal.path.json.ConfigurableJsonSlurper.parseText(ConfigurableJsonSlurper.groovy:83)
at io.restassured.path.json.JsonPath$4$1.method(JsonPath.java:965)
at io.restassured.path.json.JsonPath$ExceptionCatcher.invoke(JsonPath.java:1000)
... 29 more
`

Any Update on this i am facing issue of Parsing Json.

[MonaAgrawal]

Any update on this issue, I am facing the same issue.