我对 Hbase 和 Hadoop 很陌生，尤其是对 java 也很陌生。最近开始研究 Hbase 和 Java。我已经成功安装和配置了 Hadoop 和 Hbase，并且还使用本教程在 hbase 上制作了我的第一个 java 应用程序 http://autofei.wordpress.com/2012/04/02/java-example-code-using-hbase-data-模型操作/
现在，我想使用 servlet 和 Jsp 将 hbase 与 Web 应用程序连接起来。在这方面，我制作了一个 jsp 页面，在其中获取用户输入并将它们传输到 servlet 以将它们插入到我的 HTable 中，但不幸的是我遇到了这个错误：
`SEVERE: java.util.NoSuchElementException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:897)
at java.util.HashMap$KeyIterator.next(HashMap.java:928)
at org.apache.hadoop.security.UserGroupInformation.<init>(UserGroupInformation.java:430)
at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:452)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.hbase.util.Methods.call(Methods.java:37)
at org.apache.hadoop.hbase.security.User.call(User.java:590)
at org.apache.hadoop.hbase.security.User.callStatic(User.java:580)
at org.apache.hadoop.hbase.security.User.access$400(User.java:51)
at org.apache.hadoop.hbase.security.User$SecureHadoopUser.<init>(User.java:397)
at org.apache.hadoop.hbase.security.User$SecureHadoopUser.<init>(User.java:392)
at org.apache.hadoop.hbase.security.User.getCurrent(User.java:140)
at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionKey.<init>(HConnectionManager.java:435)
at org.apache.hadoop.hbase.client.HConnectionManager.getConnection(HConnectionManager.java:180)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:155)
at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:133)
at com.Hbase.Controller.HbaseServlet.addRecord(HbaseServlet.java:89)
at com.Hbase.Controller.HbaseServlet.processRequest(HbaseServlet.java:67)
at com.Hbase.Controller.HbaseServlet.doPost(HbaseServlet.java:159)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:357)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:260)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:188)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
at java.lang.Thread.run(Thread.java:724)
我没有做任何特别的事情，只是通过参数将 jps 的值传递给 Servlet，并使用了给定链接中提到的 addRecord 函数。当我通过以下代码创建我的 HTable 实例时，就会出现上述错误： HTable table = new HTable(conf, "scores");
我真的不知道该怎么做，因为我找不到任何将 Hbase 与 Servlet 和 Jsp 一起使用的教程。我请求请指导我如何将 Hbase 与 Servlet 和 Jsp 一起使用，并请指出我在 Web 应用程序中使用 Hbase 的任何教程，因为我必须开发一个完整的 Web 应用程序，这将是我的学位项目。
提前致谢，
问候，
山姆