[jira] [Created] (FLINK-9035) State Descriptors have broken hashCode() and equals()

["Stephan Ewen (JIRA)" <ji...@apache.org>]

Stephan Ewen created FLINK-9035:
-----------------------------------

             Summary: State Descriptors have broken hashCode() and equals()
                 Key: FLINK-9035
                 URL: https://issues.apache.org/jira/browse/FLINK-9035
             Project: Flink
          Issue Type: Bug
          Components: State Backends, Checkpointing
    Affects Versions: 1.4.2, 1.5.0
            Reporter: Stephan Ewen
            Assignee: Stephan Ewen
             Fix For: 1.6.0


The following code fails with a {{NullPointerException}}:
{code}
ValueStateDescriptor<String> descr = new ValueStateDescriptor<>("name", String.class);
descr.hashCode();
{code}
The {{hashCode()}} function tries to access the {{serializer}} field, which may be uninitialized at that point.

The {{equals()}} method is equally broken (no pun intended):

{code}
ValueStateDescriptor<String> a = new ValueStateDescriptor<>("name", String.class);
ValueStateDescriptor<String> b = new ValueStateDescriptor<>("name", String.class);

a.equals(b) // exception
b.equals(a) // exception

a.initializeSerializerUnlessSet(new ExecutionConfig());

a.equals(b) // false
b.equals(a) // exception

b.initializeSerializerUnlessSet(new ExecutionConfig());

a.equals(b) // true
b.equals(a) // true
{code}





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