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java.lang.NullPointerException: 	at com.docm.dao.AddDoctorDAO.persist(AddDoctorDAO.java:19)	at com.docm.servlets.AddDoctorServlet.doGet(AddDoctorServlet.java:38)	at com.docm.servlets.AddDoctorServlet.doPost(AddDoctorServlet.java:53)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)	at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1542)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)	at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)	at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)	at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)	at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:849)	at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:746)	at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1045)	at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:228)	at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)	at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)	at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)	at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)	at com.sun.grizzly.ContextTask.run(ContextTask.java:71)	at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)	at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)	at java.lang.Thread.run(Thread.java:724)