I wrote a testcase with embedded GlassFish for testing an EJB.
When I tried to test it using jdbc/mydb as datasource (in persistence.xml) I
got the following error
Exception while preparing the app : Invalid resource : jdbc/mydb__pm
com.sun.appserv.connectors.internal.api.ConnectorRuntimeException: Invalid
resource : jdbc/mydb__pm
When I changed the datasource to jdbc/__default with the same connection pool
as of jdbc/mydb it worked perfect.
Why is it so? What is the difference between these two datasources?
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