我需要从基于Spring的应用程序执行impala jdbc sql操作。该应用程序将部署在Tomcat 8.5上。我们已经定义了一个技术用户，可以通过该用户建立与impala的连接。没有Windows用户实际会调用服务，而是由同一位技术用户来调用服务以执行常规计划的作业。 我需要在Tomcat上为impala配置连接池。 JAAS配置在tomcat上成功连接到impala，并能够通过DriverManager调用impala上的sql语句。然后，我已经在tomcat context.xml文件中配置了数据源。当我尝试通过数据源调用sql语句时，出现以下错误。我认为，tomcat无法将“主题”或“主体”名称设置为“主题”。独立程序运行良好，这里我们实际上首先获得了登录上下文，然后调用Subect.doAs（subject，new PriviledgedAction（）{..//get connection}）。
Caused by: com.cloudera.impala.support.exceptions.GeneralException: [Cloudera][ImpalaJDBCDriver](500168) Error creating login context using ticket cache: Unable to obtain Principal Name for authentication .
... 83 common frames omitted
Caused by: javax.security.auth.login.LoginException: Unable to obtain Principal Name for authentication
at com.sun.security.auth.module.Krb5LoginModule.promptForName(Krb5LoginModule.java:841)
at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(Krb5LoginModule.java:704)
at com.sun.security.auth.module.Krb5LoginModule.login(Krb5LoginModule.java:617)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at javax.security.auth.login.LoginContext.invoke(LoginContext.java:755)
at javax.security.auth.login.LoginContext.access$000(LoginContext.java:195)
at javax.security.auth.login.LoginContext$4.run(LoginContext.java:682)
at javax.security.auth.login.LoginContext$4.run(LoginContext.java:680)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:680)
at javax.security.auth.login.LoginContext.login(LoginContext.java:587)
at com.cloudera.impala.jdbc.kerberos.Kerberos.getSubjectViaTicketCache(Unknown Source)
at com.cloudera.impala.hivecommon.api.HiveServer2ClientFactory.createTransport(Unknown Source)
at com.cloudera.impala.hivecommon.api.HiveServer2ClientFactory.createClient(Unknown Source)
at com.cloudera.impala.hivecommon.core.HiveJDBCCommonConnection.establishConnection(Unknown Source)
at com.cloudera.impala.impala.core.ImpalaJDBCConnection.establishConnection(Unknown Source)
at com.cloudera.impala.jdbc.core.LoginTimeoutConnection.connect(Unknown Source)
at com.cloudera.impala.jdbc.common.BaseConnectionFactory.doConnect(Unknown Source)
at com.cloudera.impala.jdbc.common.AbstractDriver.connect(Unknown Source)
at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:310)
at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:203)
at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:735)
at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:667)
at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:482)
at org.apache.tomcat.jdbc.pool.ConnectionPool.(ConnectionPool.java:154)
at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:118)
at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:107)
at org.apache.tomcat.jdbc.pool.DataSourceFactory.createDataSource(DataSourceFactory.java:560)
at org.apache.tomcat.jdbc.pool.DataSourceFactory.getObjectInstance(DataSourceFactory.java:244)
at org.apache.naming.factory.FactoryBase.getObjectInstance(FactoryBase.java:94)
at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:321)
at org.apache.naming.NamingContext.lookup(NamingContext.java:847)
at org.apache.naming.NamingContext.lookup(NamingContext.java:158)
at org.apache.naming.NamingContext.lookup(NamingContext.java:835)
at org.apache.naming.NamingContext.lookup(NamingContext.java:158)
at org.apache.naming.NamingContext.lookup(NamingContext.java:835)
at org.apache.naming.NamingContext.lookup(NamingContext.java:158)
at org.apache.naming.NamingContext.lookup(NamingContext.java:835)
at org.apache.naming.NamingContext.lookup(NamingContext.java:172)
at org.apache.naming.SelectorContext.lookup(SelectorContext.java:157)
at javax.naming.InitialContext.lookup(InitialContext.java:417)
at org.springframework.jndi.JndiTemplate$1.doInContext(JndiTemplate.java:155)
at org.springframework.jndi.JndiTemplate.execute(JndiTemplate.java:87)
at org.springframework.jndi.JndiTemplate.lookup(JndiTemplate.java:152)