[I] Selecting a class from a CAS can yield a classcast exception if the CAS contains subclasses of the type not locally known [uima-uimaj]

["reckart (via GitHub)" <gi...@apache.org>]

reckart opened a new issue, #384:
URL: https://github.com/apache/uima-uimaj/issues/384

   **Describe the bug**
   Let's assume with have a CAS with two types, `T` and `S` where `S` is a subtype of `T`.
   
   **To Reproduce**
   Now let's assume we are in a PEAR that brings along its own version of the `T` JCas class (let's call it `T_p`).
   
   When the code in the PEAR does a `for var T : select(T.class)` (which actually selects `T_p` and that select returns an `S`, that leads to a class cast exception because `S` cannot be cast to `T_p`.
   
   **Expected behavior**
   It would probably be a good idea to add a filter to `select(class)` to ensure that the values it returns are actually compatible with `class` - which may in the case of selecting inside a PEAR in the scenario outlined above mean that instances of `S` are actually not returned. 
   
   **Please complete the following information:**
    - Version: 3.5.0
   
   **Additional context**
   Another but similar scenario...
   
   Imagine we have a class outside of the PEAR called `H` with a field `H.x` of type `X`. Now the PEAR brings its own copy of `X` (i.e. `X_p`) but not of `H`. If the pear now calls `H.getX()` this will return an `X` instead of an `X_p` which probably also leads to a class cast exception... 
   


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Re: [I] Selecting a class from a CAS can yield a classcast exception if the CAS contains subclasses of the type not locally known [uima-uimaj]

["reckart (via GitHub)" <gi...@apache.org>]

reckart closed issue #384: Selecting a class from a CAS can yield a classcast exception if the CAS contains subclasses of the type not locally known
URL: https://github.com/apache/uima-uimaj/issues/384


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