no explanation message found for this error

Exception : Io exception: Got minus one from a read call
at : oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:189)
at : oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:231)
at : oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:345)
at : oracle.jdbc.driver.OracleConnection.(OracleConnection.java:431)
at : oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:515)
at : oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:345)
at : com.evermind.sql.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:181)
at : org.step.modressource.DAO.RessourceDAO.getRessource(RessourceDAO.java:466)
at : org.step.modressource.action.service.ShowRessourceAction.process(ShowRessourceAction.java:51)
at : org.step.core.action.BaseAction.execute(BaseAction.java:128)
at : org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:58)
at : org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:67)
at : org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
at : org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
at : org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:305)
at : org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
at : org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
at : org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at : org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
at : javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at : javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at : com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:65)
at : org.butor.web.filter.InitSessionFilter.doFilter(InitSessionFilter.java:150)
at : com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:634)
at : com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:338)
at : com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:813)
at : com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:218)
at : com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:126)
at : com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192)
at : java.lang.Thread.run(Thread.java:534)