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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