Internal Exception: java.sql.SQLRecoverableException: IO Error: The Network Adapter could not establish the connection Error Code: 17002

Error while starting weblogic server
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Internal Exception: java.sql.SQLRecoverableException: IO Error: The Network Adapter could not establish the connection
Error Code: 17002


Caused by: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLRecoverableException: IO Error: The Network Adapter could not establish the connection
Error Code: 17002
        at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:331)
        at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:326)
        at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:138)
        at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162)
        at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.setOrDetectDatasource(DatabaseSessionImpl.java:204)
        at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:741)
        at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:239)
        at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:685)
        ... 92 more
Caused by: java.sql.SQLRecoverableException: IO Error: The Network Adapter could not establish the connection
        at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:800)
        at oracle.jdbc.driver.PhysicalConnection.connect(PhysicalConnection.java:793)
        at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:33)
        at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:614)
        at java.sql.DriverManager.getConnection(DriverManager.java:571)
        at java.sql.DriverManager.getConnection(DriverManager.java:187)
        at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:98)
        ... 97 more
Caused by: oracle.net.ns.NetException: The Network Adapter could not establish the connection
        at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:475)
        at oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:569)
        at oracle.net.ns.NSProtocol.establishConnection(NSProtocol.java:620)
        at oracle.net.ns.NSProtocol.connect(NSProtocol.java:239)
        at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1606)
        at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:539)
        ... 103 more
Caused by: java.net.NoRouteToHostException: No route to host
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.net.Socket.connect(Socket.java:579)
        at oracle.net.nt.MetricsEnabledSocket.connect(TcpNTAdapter.java:660)
        at oracle.net.nt.TcpNTAdapter.connect(TcpNTAdapter.java:174)
        at oracle.net.nt.ConnOption.connect(ConnOption.java:162)
        at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:431)



Solution :
++++++
Issue with listener .

check "host" entries  in listener.ora and tnsnames.ora file must be same