[jira] [Created] (FLINK-6799) PojoSerializer does not check field types when being deserialized

[Shang Yuanchun (Jira)]

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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