while connecting to database i got this problem
in persistence.xml file , in that i selected "connection" tab, and then in
the field "JTA data source :" iam giving jdbc/_default,but it is showing me
below specified error while saving the file.
cannot Deploy HelloWorld
Deployment Error for module: HelloWorld: Exception while preparing the app :
java.lang.RuntimeException: javax.naming.NamingException: Lookup failed for
'jdbc/_default' in SerialContext [Root exception is
javax.naming.NameNotFoundException: _default not found]
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