Till Rohrmann created FLINK-6799:
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Summary: PojoSerializer does not check field types when being
deserialized
Key: FLINK-6799
URL: https://issues.apache.org/jira/browse/FLINK-6799
Project: Flink
Issue Type: Bug
Components: Type Serialization System
Affects Versions: 1.3.0, 1.4.0
Reporter: Till Rohrmann
The {{PojoSerializer}} stores internally the fields of a pojo as {{Field}}
instances. These field instances are serialized via the {{FieldSerializer}}.
The {{FieldSerializer}} simply writes out the name of the field. When being
deserialized, the serializer reads the name and then looks up the field using
the dynamically loaded class. If the underlying class changes, e.g. type of
fields change, then this won't be noticed, because we don't check the field
types. In order to catch errors early and to give meaningful error messages, I
think we should add type checks for the reloaded fields.
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