Error or render screen in application pimefaces - NullPointException

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Error or render screen in application pimefaces - NullPointException

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#1 by (2 votes)

3

Your method, when called, gives NullPointException .

Has an expression that validates when editing appears header "Product Edition", if New registration appears "new." In cadastroProdutoBean.java has method boolean isEditando , in it is giving error.

Method:

public boolean isEditando() {
    return this.produto.getId() != null; 
}

Expression in xhtml:

#{cadastroProdutoBean.editando ? 'Edição de Produto' : 'Novo Produto'}

Follow the log:

 GRAVE: Error Rendering View[/produtos/CadastroProduto.xhtml]
javax.el.ELException: /produtos/CadastroProduto.xhtml: Error reading 'editando' on type com.oliveira.pedidovenda.controller.CadastroProdutoBean
    at com.sun.faces.facelets.compiler.TextInstruction.write(TextInstruction.java:88)
    at com.sun.faces.facelets.compiler.UIInstructions.encodeBegin(UIInstructions.java:82)
    at com.sun.faces.facelets.compiler.UILeaf.encodeAll(UILeaf.java:183)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:458)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:134)
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:651)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1082)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:623)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
    at com.oliveira.pedidovenda.controller.CadastroProdutoBean.isEditando(CadastroProdutoBean.java:106)
    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.el.BeanELResolver.getValue(BeanELResolver.java:99)
    at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
    at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
    at org.apache.el.parser.AstValue.getValue(AstValue.java:184)
    at org.apache.el.parser.AstChoice.getValue(AstChoice.java:44)
    at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
    at org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:50)
    at com.sun.faces.facelets.el.ELText$ELTextVariable.writeText(ELText.java:238)
    at com.sun.faces.facelets.compiler.TextInstruction.write(TextInstruction.java:85)
    ... 32 more

01:32:40.663 [http-bio-8080-exec-6] ERROR com.oliveira.pedidovenda.util.jsf.JsfExceptionHandler - Erro de sistema: /produtos/CadastroProduto.xhtml: Error reading 'editando' on type com.oliveira.pedidovenda.controller.CadastroProdutoBean
javax.el.ELException: /produtos/CadastroProduto.xhtml: Error reading 'editando' on type com.oliveira.pedidovenda.controller.CadastroProdutoBean
    at com.sun.faces.facelets.compiler.TextInstruction.write(TextInstruction.java:88) ~[javax.faces-2.2.8-15.jar:2.2.8-15]
    at com.sun.faces.facelets.compiler.UIInstructions.encodeBegin(UIInstructions.java:82) ~[javax.faces-2.2.8-15.jar:2.2.8-15]
    at com.sun.faces.facelets.compiler.UILeaf.encodeAll(UILeaf.java:183) ~[javax.faces-2.2.8-15.jar:2.2.8-15]
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859) ~[javax.faces-2.2.8-15.jar:2.2.8-15]
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859) ~[javax.faces-2.2.8-15.jar:2.2.8-15]
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:458) ~[javax.faces-2.2.8-15.jar:2.2.8-15]
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:134) ~[javax.faces-2.2.8-15.jar:2.2.8-15]
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337) ~[javax.faces-2.2.8-15.jar:2.2.8-15]
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337) ~[javax.faces-2.2.8-15.jar:2.2.8-15]
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120) ~[javax.faces-2.2.8-15.jar:2.2.8-15]
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) [javax.faces-2.2.8-15.jar:2.2.8-15]
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219) [javax.faces-2.2.8-15.jar:2.2.8-15]
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:651) [javax.faces-2.2.8-15.jar:2.2.8-15]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) [catalina.jar:7.0.70]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) [catalina.jar:7.0.70]
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat7-websocket.jar:7.0.70]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) [catalina.jar:7.0.70]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) [catalina.jar:7.0.70]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218) [catalina.jar:7.0.70]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) [catalina.jar:7.0.70]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) [catalina.jar:7.0.70]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169) [catalina.jar:7.0.70]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) [catalina.jar:7.0.70]
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956) [catalina.jar:7.0.70]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) [catalina.jar:7.0.70]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442) [catalina.jar:7.0.70]
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1082) [tomcat-coyote.jar:7.0.70]
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:623) [tomcat-coyote.jar:7.0.70]
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318) [tomcat-coyote.jar:7.0.70]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_92]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_92]
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-coyote.jar:7.0.70]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_92]
Caused by: java.lang.NullPointerException
    at com.oliveira.pedidovenda.controller.CadastroProdutoBean.isEditando(CadastroProdutoBean.java:106) ~[classes/:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_92]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_92]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_92]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_92]
    at javax.el.BeanELResolver.getValue(BeanELResolver.java:99) ~[el-api.jar:2.2.FR]
    at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176) ~[javax.faces-2.2.8-15.jar:2.2.8-15]
    at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203) ~[javax.faces-2.2.8-15.jar:2.2.8-15]
    at org.apache.el.parser.AstValue.getValue(AstValue.java:184) ~[jasper-el.jar:7.0.70]
    at org.apache.el.parser.AstChoice.getValue(AstChoice.java:44) ~[jasper-el.jar:7.0.70]
    at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184) ~[jasper-el.jar:7.0.70]
    at org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:50) ~[weld-servlet-2.3.2.Final.jar:2.3.2.Final]
    at com.sun.faces.facelets.el.ELText$ELTextVariable.writeText(ELText.java:238) ~[javax.faces-2.2.8-15.jar:2.2.8-15]
    at com.sun.faces.facelets.compiler.TextInstruction.write(TextInstruction.java:85) ~[javax.faces-2.2.8-15.jar:2.2.8-15]
    ... 32 more

jsf-2.2 cdi primefaces-5.2

asked by anonymous 08.07.2016 / 07:24

1 answer

Lumen and Firebird Database Converting an nvarchar data type to a datetime data type resulted in a value outside the range

score 2 · Accepted Answer

The expression in the isEditando method will throw an NPE if the produto attribute is null.

To correct the problem, either you should ensure that the product is selected before the method is run or check for a value in the variable, for example:

return this.produto != null && this.produto.getId() != null;