Encontrei esse erro na hora de subir um OSB, o problema ocorre devido a maquina não esta com o arquivo resolv.conf configurado corretamente .
Alguns erros semelhantes:
Caused by: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.6.3.v20160526-8f41838): org.eclipse.persistence.exceptions.DatabaseException Internal Exception: java.sql.SQLRecoverableException: IO Error: Unknown host specified Error Code: 17002 oracle.security.jps.JpsException: JPS-00027: There was an internal error: oracle.net.ns.NetException: Unknown host specified Caused By: oracle.net.ns.NetException: Unknown host specified Caused by: java.sql.SQLRecoverableException: IO Error: Unknown host specified at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:800) Caused by: oracle.net.ns.NetException: Unknown host specified at oracle.net.resolver.HostnameNamingAdapter.resolve(HostnameNamingAdapter.java:208) at oracle.net.resolver.NameResolver.resolveName(NameResolver.java:132) at oracle.net.resolver.AddrResolution.resolveAndExecute(AddrResolution.java:539) 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) ... 100 more
Solução corrija o arquivo resolv.conf ou adicione as maquinas no arquivo host