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java.sql.SQLException: Io exception: The Network Adapter could not establish the connection	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:124)	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:161)	at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:273)	at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:318)	at oracle.jdbc.driver.PhysicalConnection.(PhysicalConnection.java:343)	at oracle.jdbc.driver.T4CConnection.(T4CConnection.java:147)	at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:31)	at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:545)	at org.hibernate.engine.jdbc.connections.internal.DriverConnectionCreator.makeConnection(DriverConnectionCreator.java:38)	at org.hibernate.engine.jdbc.connections.internal.BasicConnectionCreator.createConnection(BasicConnectionCreator.java:58)	at org.hibernate.engine.jdbc.connections.internal.PooledConnections.addConnections(PooledConnections.java:106)	at org.hibernate.engine.jdbc.connections.internal.PooledConnections.(PooledConnections.java:40)	at org.hibernate.engine.jdbc.connections.internal.PooledConnections.(PooledConnections.java:19)	at org.hibernate.engine.jdbc.connections.internal.PooledConnections$Builder.build(PooledConnections.java:138)	at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.buildPool(DriverManagerConnectionProviderImpl.java:110)	at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.configure(DriverManagerConnectionProviderImpl.java:74)	at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:94)	at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:217)	at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:189)	at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.buildJdbcConnectionAccess(JdbcEnvironmentInitiator.java:145)	at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:66)	at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35)	at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:88)	at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:234)	at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:208)	at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:189)	at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:51)	at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:94)	at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:217)	at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:189)	at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.handleTypes(MetadataBuildingProcess.java:352)	at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:111)	at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.build(MetadataBuildingProcess.java:83)	at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:418)	at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:87)	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:692)	at com.singtel.mi.database.MIQueueDaoImpl.getSessionFactory(MIQueueDaoImpl.java:67)	at com.singtel.mi.database.MIQueueDaoImpl.openCurrentSession(MIQueueDaoImpl.java:44)	at com.singtel.mi.service.MessageInboxService.findAllCampaign(MessageInboxService.java:66)	at com.singtel.mi.service.APICallService.postJSONDatatoAWS(APICallService.java:25)	at com.singtel.mi.service.TestMessageInbox.main(TestMessageInbox.java:8)