[jira] [Created] (UIMA-5500) UIMA-AS V3: Replace dd2spring with java based DD processing

["Jerry Cwiklik (JIRA)" <de...@uima.apache.org>]

Jerry Cwiklik created UIMA-5500:
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             Summary: UIMA-AS V3: Replace dd2spring with java based DD processing
                 Key: UIMA-5500
                 URL: https://issues.apache.org/jira/browse/UIMA-5500
             Project: UIMA
          Issue Type: Sub-task
          Components: Async Scaleout
            Reporter: Jerry Cwiklik
            Assignee: Jerry Cwiklik
             Fix For: 3.0.0AS


Current UIMA-AS uses dd2spring to parse DD into intermediate format (Spring Context) which is than fed into Spring Framework to instantiate components of the UIMA-AS at runtime. The dd2spring uses saxon and custom xslt stylesheet to process a DD. The xslt is quite complex and difficult to maintain. The saxon library requires that the DD is provided as a fully qualified file  preventing from loading it from a classpath or datapath. 
Instead of dd2spring, the UIMA-AS can use xmlbeans to parse the DD and instantiate on object model representing it. There already exists a schema for the DD in UIMA-AS from which an object model can be generated. 
New java only code can than use the model to create components necessary to deploy UIMA-AS service. The wiring of components will be done in java instead of relying on Spring which hides much of this process. 
The removal of dd2spring is largely an internal UIMA-AS concern and user code impact of this change should be minimal. The user no longer will have to specify Saxon nor the dd2springXsltFilePath when launching or deploying a service. 



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