reckart opened a new issue, #389:
URL: https://github.com/apache/uima-uimaj/issues/389
**Describe the bug**
The JCas classes have an "offset" assigned to their features. When
committing a type system, these offsets are set the first time a type system is
committed and validated on subsequent type system commits. This can cause
problems if the type systems contain different numbers of features for a given
type.
**To Reproduce**
Steps to reproduce the behavior:
1. Define a type `MySuper` with a feature `x`
2. Define a type `MySub` with a feature `z`
3. Generate JCas classes for both
4. Load the type system description that defines the two types and add
another feature `y` to `MySuper`
5. Create a new JCas instance that uses the type system description from
step 4
6. Create a new JCas instance that uses the original type system description
that does not contain `y`
7. This should generate an error like
```
Caused by: org.apache.uima.UIMA_IllegalStateException: Loaded JCas Type
MySub has feature z with two different type systems having different offsets;
this is not supported.
at
org.apache.uima.cas.impl.FSClassRegistry.updateOrValidateAllCallSitesForJCasClass(FSClassRegistry.java:1662)
... 125 more
```
**Expected behavior**
When assigning feature offsets to be used in JCas classes, all features that
are actually part of the JCas class should always be assigned first through the
entire JCas class hierarchy. Offsets for features defined in the type system
description but not in the JCas class should always be assigned afterwards.
Features that are defined in the JCas class but not in the type system
description should still get assigned an offset to ensure that their offset is
not consumed by the time another type system is loaded that might include the
feature.
**Please complete the following information:**
- Version: 3.5.1
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