异常信息，如下

Caused by: dm.jdbc.driver.DMException: 网络通信异常
at dm.jdbc.driver.DBError.throwException(SourceFile:852)
at dm.jdbc.a.a.init(SourceFile:216)
at dm.jdbc.a.a.(SourceFile:183)
at dm.jdbc.driver.DmdbConnection.openConnection(SourceFile:836)
at dm.jdbc.internal.conf.EP.connect(SourceFile:153)
at dm.jdbc.internal.conf.EPGroup$EPSelector.select(SourceFile:540)
at dm.jdbc.internal.conf.EPGroup.connect(SourceFile:353)
at dm.jdbc.driver.DmDriver.do_connect(SourceFile:193)
at dm.jdbc.driver.DmDriver.connect(SourceFile:479)