Bug: Multi-step Workflow throws JSON Parsing error on Java8.al2 runtime

[peter-smith-phd]

Here are the steps to reproduce:

% sam init
Select AWS Quick Start Templates
Select Multi-step Workflow
Select Java8.al2
Select gradle
Select all the remaining defaults

> cd sam-app
> sam build
> sam deploy -g
Select all the remaining defaults.

In the template, change HourlyTradingSchedule to Enable: True, and rate(1 minute) so the State Machine will actually run, then:
> sam build && sam deploy

Wait a minute for the state machine to run, then in the Step Functions log for the state machine, you'll see the following:

{
  "errorMessage": "An error occurred during JSON parsing",
  "errorType": "java.lang.RuntimeException",
  "stackTrace": [],
  "cause": {
    "errorMessage": "com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `java.lang.String` out of START_OBJECT token\n at [Source: (ByteArrayInputStream); line: 1, column: 323] (through reference chain: java.util.LinkedHashMap[\"detail\"])",
    "errorType": "java.io.UncheckedIOException",
    "stackTrace": [
      "com.amazonaws.services.lambda.runtime.serialization.factories.JacksonFactory$InternalSerializer.fromJson(JacksonFactory.java:184)"
    ],
    "cause": {
      "errorMessage": "Cannot deserialize instance of `java.lang.String` out of START_OBJECT token\n at [Source: (ByteArrayInputStream); line: 1, column: 323] (through reference chain: java.util.LinkedHashMap[\"detail\"])",
      "errorType": "com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.exc.MismatchedInputException",
      "stackTrace": [
        "com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:59)",
        "com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1445)",
        "com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1219)",
        "com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1129)",
        "com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:63)",
        "com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:10)",
        "com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.deser.std.MapDeserializer._readAndBindStringKeyMap(MapDeserializer.java:527)",
        "com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:364)",
        "com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:29)",
        "com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.ObjectReader._bindAndClose(ObjectReader.java:1719)",
        "com.amazonaws.lambda.thirdparty.com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:1228)",
        "com.amazonaws.services.lambda.runtime.serialization.factories.JacksonFactory$InternalSerializer.fromJson(JacksonFactory.java:182)"
      ]
    }
  }
}

[moelasmar]

Thanks @northvankiwiguy for raising this issue. I will try to reproduce it to investigate the issue.