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When trying to connect to Discoverer Plus I get the below error message:
Unable to connect to the Discoverer server: null Please contact your Oracle Application Server administrator.
This issue can be caused due to a mismatch between the jar file being used against the version of java installed on the machine. E.g. Your Discoverer Plus URL is designed for Java version 1.7 but you are using Java 1.6 on your machine.
Find out what version is your Discoverer Plus URL is designed for and make sure you have the right version on your machine.