Balázs Németh created BEAM-6963:
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Summary: Bug in RuntimeValueProvider JSON serialization
Key: BEAM-6963
URL: https://issues.apache.org/jira/browse/BEAM-6963
Project: Beam
Issue Type: Bug
Components: sdk-java-core
Affects Versions: 2.11.0
Reporter: Balázs Németh
Classes affected:
org.apache.beam.sdk.options.ValueProvider.Serializer
org.apache.beam.sdk.options.ValueProvider.Deserializer
The problem is that according to the JsonDeserializer documentation, the
deserialize method isn't executed for null nodes:
[https://static.javadoc.io/com.fasterxml.jackson.core/jackson-databind/2.9.6/com/fasterxml/jackson/databind/JsonDeserializer.html#deserialize(com.fasterxml.jackson.core.JsonParser,%20com.fasterxml.jackson.databind.DeserializationContext)
]"Note that this method is never called for JSON null literal, and thus
deserializers need (and should) not check for it."
If we serialize a RuntimeValueProvider, the isAccessible() will return false,
so we call a writeNull(). During deserialization this isn't handled properly as
mentioned and our deserialization will return null.
The end result is that getters with ValueProvider return values will return
"null". AFAIK ValueProvider getters should be never null.
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