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java.lang.NullPointerException: 	at org.admon.db.compras.modelo.DetalleOds.getTotal(DetalleOds.java:140)	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:616)	at org.openxava.util.PropertiesManager.executeGet(PropertiesManager.java:80)	at org.openxava.calculators.ModelPropertyCalculator.calculate(ModelPropertyCalculator.java:27)	at org.openxava.view.View.calculateValue(View.java:2497)	at org.openxava.view.View.tryPropertyChanged(View.java:2297)	at org.openxava.view.View.propertyChanged(View.java:2282)	at org.openxava.view.View.propertyChanged(View.java:2264)	at org.openxava.view.View.calculateDefaultValues(View.java:1611)	at org.openxava.view.View.reset(View.java:1528)	at org.openxava.actions.CreateNewElementInCollectionAction.execute(CreateNewElementInCollectionAction.java:21)	at org.openxava.controller.ModuleManager.executeAction(ModuleManager.java:374)	at org.openxava.controller.ModuleManager.executeAction(ModuleManager.java:291)	at org.openxava.controller.ModuleManager.execute(ModuleManager.java:251)	at org.apache.jsp.xava.execute_jsp._jspService(execute_jsp.java:177)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)	at org.openxava.web.servlets.Servlets.getURIAsStream(Servlets.java:66)	at org.openxava.web.dwr.Module.getURIAsStream(Module.java:182)	at org.openxava.web.dwr.Module.request(Module.java:63)	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:616)	at org.directwebremoting.impl.ExecuteAjaxFilter.doFilter(ExecuteAjaxFilter.java:34)	at org.directwebremoting.impl.DefaultRemoter$1.doFilter(DefaultRemoter.java:428)	at org.directwebremoting.impl.DefaultRemoter.execute(DefaultRemoter.java:431)	at org.directwebremoting.impl.DefaultRemoter.execute(DefaultRemoter.java:283)	at org.directwebremoting.servlet.PlainCallHandler.handle(PlainCallHandler.java:52)	at org.directwebremoting.servlet.UrlProcessor.handle(UrlProcessor.java:101)	at org.directwebremoting.servlet.DwrServlet.doPost(DwrServlet.java:146)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.insisto.general.security.utils.LifeTimeFilter.doFilter(LifeTimeFilter.java:113)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)	at java.lang.Thread.run(Thread.java:636)