*Python:*

```
d = json.loads(str)
d['foo'] = bar
json.dumps(d)
```

*Scala:*
```
Caused by: TimerException{org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `scala.collection.immutable.Map` (no Creators, like default constructor, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information
at [Source: UNKNOWN; line: 1, column: 1]}
... 15 more
```