Type System Merging Should Produce Consistent Ordering of Types
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Key: UIMA-1257
URL: https://issues.apache.org/jira/browse/UIMA-1257
Project: UIMA
Issue Type: Improvement
Components: Core Java Framework
Affects Versions: 2.2.2
Reporter: Adam Lally
Assignee: Adam Lally
Priority: Minor
Fix For: 2.3
Currently when type systems are merged across annotators, the ordering of the
types produced by the merge method is not defined, and varies according to the
ordering in which the individual type system descriptors are passed to the
merge method. The ordering depends on the order in which individual AEs are
initialized, which is also not defined, and may even vary according to JVM
version.
One reason to improve this is that UIMA-AS has a feature to allow binary
serialization, but it requires that type systems be identical on both sides of
the connection, and it is difficult to ensure this if ordering cannot be relied
on.
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