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java.lang.NullPointerException
	at com.onlinestudy.callService.FrontCallServiceCommand.showData(FrontCallServiceCommand.java:143)
	at com.onlinestudy.callService.FrontCallServiceCommand.execute(FrontCallServiceCommand.java:67)
	at com.base.command.JDBCCommandExecutor.execute(JDBCCommandExecutor.java:25)
	at com.base.command.Executor.execute(Executor.java:26)
	at com.base.command.Executor.execute(Executor.java:12)
	at com.onlinestudy.callService.FrontCallServiceAction.execute(FrontCallServiceAction.java:33)
	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1077)
	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:465)
	at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:348)
	at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:7047)
	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
	at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
	at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3902)
	at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2773)
	at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:224)
	at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:183)