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High availability and scalability has always been the focus in different systems enabling the customer scenarios with cost efficient solutions. There are various known issues in a heterogeneous complex environment involving JEE middle tier and the backend database. For example, the application requests may get blocked for a long period when a database node dies. There's no easy way to tell whether to obtain a fresh new connection after an application received the SQLException. The middle tier applications are unaware of new or restarted database nodes or it executes the work on a slow, hung or dead database node. Often it has to rely on waiting for TCP/IP time-outs.
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