oracle.net.ns.NetException: The Network Adapter could not establish the connection

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oracle.net.ns.NetException: The Network Adapter could not establish the connection	at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:334)	at oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:425)	at oracle.net.ns.NSProtocol.establishConnection(NSProtocol.java:646)	at oracle.net.ns.NSProtocol.connect(NSProtocol.java:212)	at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1076)	at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:303)	at oracle.jdbc.driver.PhysicalConnection.(PhysicalConnection.java:640)	at oracle.jdbc.driver.T4CConnection.(T4CConnection.java:205)	at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35)	at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:554)	at weblogic.jdbc.common.internal.ConnectionEnvFactory.makeConnection(ConnectionEnvFactory.java:327)	at weblogic.jdbc.common.internal.ConnectionEnvFactory.createResource(ConnectionEnvFactory.java:227)	at weblogic.common.resourcepool.ResourcePoolImpl.makeResources(ResourcePoolImpl.java:1193)	at weblogic.common.resourcepool.ResourcePoolImpl.makeResources(ResourcePoolImpl.java:1117)	at weblogic.common.resourcepool.ResourcePoolImpl.reserveResourceInternal(ResourcePoolImpl.java:427)	at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:332)	at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:322)	at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:438)	at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:317)	at weblogic.jdbc.common.internal.ConnectionPoolManager.reserve(ConnectionPoolManager.java:93)	at weblogic.jdbc.common.internal.RmiDataSource.getPoolConnection(RmiDataSource.java:342)	at weblogic.jdbc.common.internal.RmiDataSource.getConnection(RmiDataSource.java:360)	at oracle.mds.internal.persistence.db.JNDIConnectionManagerImpl.fetchConnection(JNDIConnectionManagerImpl.java:91)	at oracle.mds.internal.persistence.db.ConnectionManager.getConnection(ConnectionManager.java:347)	at oracle.mds.internal.persistence.db.BaseReposAccess.(BaseReposAccess.java:347)	at oracle.mds.internal.persistence.db.shredded.ShreddedReposAccess.(ShreddedReposAccess.java:274)	at oracle.mds.internal.persistence.db.shredded.ShreddedDBMSConnection.createReposAccess(ShreddedDBMSConnection.java:444)	at oracle.mds.internal.persistence.db.BaseDBMSConnection.getOrCreateReposAccess(BaseDBMSConnection.java:2072)	at oracle.mds.internal.persistence.db.BaseDBMSConnection.queryStoreForLatestCommitNumber(BaseDBMSConnection.java:2503)	at oracle.mds.internal.persistence.db.DBDocumentChangeProvider.queryStoreForLatestCommitNumber(DBDocumentChangeProvider.java:330)	at oracle.mds.internal.persistence.db.DBDocumentChangeProvider.getChanges(DBDocumentChangeProvider.java:81)	at oracle.mds.persistence.stores.db.DBMetadataStoreCommunicator.signalChanges(DBMetadataStoreCommunicator.java:134)	at oracle.mds.internal.persistence.db.ChangePollingThread.run(ChangePollingThread.java:81)