OTM6.3.6 Weblogic Start up Issue

Hi all：
I got a OTM6.3.6 environment ，which installed in 3 server： APP server，WEB server and database server。
i accidentally changed the user ： 'guest' 's password to hit@chi in OTM APP, authentication error occurs.then i changed all users password to CHANGEME under the security guide. after restart the server, i found out that the GC3 realm on Weblogic is sucessfully initialized , but there is no data source. i checked the log ,shows a error : cause.InvalidDataConnection.
i can connect to the database via sqlplus on app server ,using the db connecting info that stored in glog.properties. also i found that on login screen it shows "label.username" instead of "user name". when login in , weblogic.console shows :cause.catchingrealm.0002, cause.InvalidDataConnection.

here is some log , could anyone offer any help ? thx a lot.

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INFO | 2015/08/01 16:39:12 | GC3 realm initializing <-----------
INFO | 2015/08/01 16:39:13 | -----------> GC3 realm initialized
INFO | 2015/08/01 16:39:15 | <Aug 1, 2015 4:39:15 PM CST> <Notice> <Security> <BEA-090082> <Security initializing using security realm otmrealm.>
INFO | 2015/08/01 16:39:21 | <Aug 1, 2015 4:39:21 PM CST> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to STANDBY>
INFO | 2015/08/01 16:39:21 | <Aug 1, 2015 4:39:21 PM CST> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to STARTING>
INFO | 2015/08/01 16:39:29 | -- OTM Event: preDeploy
INFO | 2015/08/01 16:39:45 | [INFO ][memory ] [YC#1] 73.361-73.718: YC 2202863KB->779247KB (4194304KB), 0.358 s, sum of pauses 357.325 ms, longest pause 357.325 ms.
INFO | 2015/08/01 16:40:05 | [INFO ][memory ] [YC#2] 93.380-93.589: YC 2414934KB->990281KB (4194304KB), 0.209 s, sum of pauses 209.232 ms, longest pause 209.232 ms.
INFO | 2015/08/01 16:40:41 | -- OTM Event: initContext
INFO | 2015/08/01 16:40:41 | -- OTM Event: startupServlet
INFO | 2015/08/01 16:40:41 | -- OTM Startup: loading startup classes
INFO | 2015/08/01 16:40:41 | --
INFO | 2015/08/01 16:40:47 | [INFO ][memory ] [YC#3] 134.867-135.202: YC 2617969KB->1207912KB (4194304KB), 0.335 s, sum of pauses 334.393 ms, longest pause 334.393 ms.
INFO | 2015/08/01 16:41:10 | java.lang.reflect.InvocationTargetException
INFO | 2015/08/01 16:41:10 | at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
INFO | 2015/08/01 16:41:10 | at sun.reflect.NativeMethodAccessorImpl.invoke(Native MethodAccessorImpl.java:39)
INFO | 2015/08/01 16:41:10 | at sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
INFO | 2015/08/01 16:41:10 | at java.lang.reflect.Method.invoke(Method.java:597)
INFO | 2015/08/01 16:41:10 | at glog.database.security.dbrealm.CachingRealm.getCac hed(CachingRealm.java:111)
INFO | 2015/08/01 16:41:10 | at glog.database.security.dbrealm.CachingRealm.getDom ain(CachingRealm.java:950)
INFO | 2015/08/01 16:41:10 | at glog.database.security.SecurityDomainImpl.find(Sec urityDomainImpl.java:61)
INFO | 2015/08/01 16:41:10 | at glog.database.security.SecurityUtil.getDomain(Secu rityUtil.java:130)
INFO | 2015/08/01 16:41:10 | at glog.server.status.StatusConfiguration.readDomainS tatus(StatusConfiguration.java:364)
INFO | 2015/08/01 16:41:10 | at glog.server.status.StatusConfiguration.readAllDoma inStatus(StatusConfiguration.java:342)
INFO | 2015/08/01 16:41:10 | at glog.server.status.StatusConfiguration.loadData(St atusConfiguration.java:57)
INFO | 2015/08/01 16:41:10 | at glog.util.DataLoader.load(DataLoader.java:19)
......
INFO | 2015/08/01 16:41:10 | Caused by: cause.InvalidDataConnection