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Although the implementation of the WebFlow proved to be very successful, we are not satisfied with this to the large extend custom solution
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Middle tier is based on a custom protocol implemented directly on top of URL and socket based interactions
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Not scalable (Uses multi-threading to support concurrency of user modules in middle-tier)
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Difficult to implement security features, fault tolerance, monitoring
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Impossible to take advantage of new technologies
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There is no flexibility to compose application
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Supports only data-flow model
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There is no persistent model( like with XML and java serialization)
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There is no way to copy and paste any user module running in a application
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