pact-jvm: Json parsing error thrown while running the service consumer test

Hey guys,

We have a pact-jvm(pact-jvm-consumer-junit_2.11:3.4.1) setup running the junit tests to generate the pact file.Recently we have started getting this error while running the tests. Stacktrace doesnt give a lot of info but looks like some discrepancy in reading the Pact file. Not sure if its how I am generating the response causing the issue.

groovy.json.JsonException: Unable to determine the current character, it is not a string, number, array, or object

The current character read is '?' with an int value of 0
Unable to determine the current character, it is not a string, number, array, or object
line number 1
index number 255
????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
...............................................................................................................................................................................................................................................................^
	at groovy.json.internal.JsonParserCharArray.decodeValueInternal(JsonParserCharArray.java:206)
	at groovy.json.internal.JsonParserCharArray.decodeValue(JsonParserCharArray.java:157)
	at groovy.json.internal.JsonParserCharArray.decodeFromChars(JsonParserCharArray.java:46)
	at groovy.json.internal.JsonParserCharArray.parse(JsonParserCharArray.java:384)
	at groovy.json.internal.BaseJsonParser.parse(BaseJsonParser.java:128)
	at groovy.json.internal.BaseJsonParser.parse(BaseJsonParser.java:151)
	at groovy.json.JsonSlurper.parseFile(JsonSlurper.java:365)
	at groovy.json.JsonSlurper.parse(JsonSlurper.java:348)
	at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:232)
	at au.com.dius.pact.model.PactReader.loadFile(PactReader.groovy:159)
	at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:232)
	at au.com.dius.pact.model.PactReader.loadPact(PactReader.groovy:26)
	at au.com.dius.pact.model.PactReader.loadPact(PactReader.groovy)
	at org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:232)
	at au.com.dius.pact.model.BasePact.write(BasePact.groovy:109)
	at au.com.dius.pact.consumer.BaseMockServer.runAndWritePact(MockHttpServer.kt:147)
	at au.com.dius.pact.consumer.ConsumerPactRunnerKt.runConsumerTest(ConsumerPactRunner.kt:13)
	at au.com.dius.pact.consumer.BaseProviderRule.runPactTest(BaseProviderRule.java:148)
	at au.com.dius.pact.consumer.BaseProviderRule.access$100(BaseProviderRule.java:21)
	at au.com.dius.pact.consumer.BaseProviderRule$1.evaluate(BaseProviderRule.java:76)
	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.runTestClass(JUnitTestClassExecuter.java:114)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.execute(JUnitTestClassExecuter.java:57)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassProcessor.processTestClass(JUnitTestClassProcessor.java:66)
	at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:51)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
	at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:32)
	at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93)
	at com.sun.proxy.$Proxy2.processTestClass(Unknown Source)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.processTestClass(TestWorker.java:109)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
	at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:377)
	at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:54)
	at org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:40)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

This is one of the interaction setup where we are getting this error,

    @Pact(consumer = CONSUMER_ID)
    public RequestResponsePact getBoardsForMobile(PactDslWithProvider builder) {
        return builder
                .given("Project with boards")
                .uponReceiving("GET all boards")
                .matchPath(BOARDS_API_PATTERN, BOARDS_API_EXAMPLE)
                .method("GET")
                .query("maxResults=10")
                .willRespondWith()
                .status(HttpStatus.SC_OK)
                .headers(ImmutableMap.of("Content-Type", "application/json"))
                .body(new PactDslJsonBody()
                        .minArrayLike("values", 1)
                        .id()
                        .stringMatcher("type", "CORE")
                        .stringMatcher("name", "Business")
                        .stringMatcher("moduleKey", CORE_MODULE_EXAMPLE)
                        .closeObject()
                        .object()
                        .id()
                        .stringMatcher("type", "SCRUM")
                        .stringMatcher("name", "DEMO board")
                        .stringMatcher("moduleKey", AGILE_MODULE_EXAMPLE)
                        .closeObject()
                        .closeArray()
                        .asBody())
                .toPact();
    }

And this is how the json from pact file looks like,

mobile-rest-plugin will respond with:

{
  "status": 200,
  "headers": {
    "Content-Type": "application/json"
  },
  "body": {
    "values": [
      {
        "name": "Business",
        "id": 8124081232,
        "type": "CORE",
        "moduleKey": "core-mobile-board-service"
      },
      {
        "name": "DEMO board",
        "id": 4597649782,
        "type": "SCRUM",
        "moduleKey": "agile-mobile-board-service"
      }
    ]
  }
}