org.eclipse.persistence.exceptions.DatabaseException Internal Exception: java.sql.SQLRecoverableException: IO Error: The Network Adapter could not establish the connection

Issue:

****** weblogic startup log ******

INFO: Found persistence provider "org.eclipse.persistence.jpa.PersistenceProvider". OpenJPA will not be used.
[EL Severe]: 2015-12-06

03:35:08.961--ServerSession(1577131615)--Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.3.1.v20111018-r10243):

org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLRecoverableException: IO Error: The Network Adapter

could not establish the connection
Error Code: 17002
Dec 6, 2015 3:35:08 AM

oracle.security.jps.internal.credstore.ldap.LdapCredentialStore init
WARNING: Could not create credential store instance. Reason

oracle.security.jps.service.policystore.PolicyStoreConnectivityException: JPS-10000: There was an internal error in the policy store.
JPS-01055: Could not create credential store instance. Reason oracle.security.jps.service.policystore.PolicyStoreConnectivityException:

JPS-10000: There was an internal error in the policy store.
Error: Diagnostics data was not saved to the credential store.
Error:

Validate operation has failed.
Need to do the security configuration first!

Solution:

1. Verify Database listener is up & running or not


2. Take the backup of jpsconfig.xml file


3. Start the database listener


$$ORACLE_HOME/bin

$lsnrctrl status listener  -- Verify Listener status

$lsnrctrl start listener   -- Start the listener,if already not started


4. Start the weblogic from command prompt


$DOMAIN_HOME/bin

$nohup ./startWeblogic.sh > AdminServer.log &

$tail -f AdminServer.log

5. Weblogic Admin Server will start normally.