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jsf - javax.el.PropertyNotWritableException: Illegal Syntax for Set Operation

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jsf - javax.el.PropertyNotWritableException: Illegal Syntax for Set Operation

I'm making a project to school in JSF and I have few problems with that.

First of all, the h:commandButton doesn't work properly when I want to redirect myself to another page of the project by pushing it. There is an error displayed:

javax.el.PropertyNotWritableException: Illegal Syntax for Set Operation

index.jsp:

<?xml version="1.0" encoding="ISO-8859-1" ?>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>  
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>  

<html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core">
  <head>
<title>Firma Komputerowa - Baza Danych</title>
<link rel="stylesheet" href="${pageContext.request.contextPath}/resources/table-style.css" />
  </head>
     <body>
       <f:view>
         <h:form>   
        <h:panelGrid columns="3">
     <h:commandButton action="#{producentBean.redirect }" value="Dodaj"/>
</h:panelGrid>
<h:panelGrid>
    <h:dataTable value="#{producentBean.List}" var="p" 
                styleClass="order-table"
                headerClass="order-table-header"
                rowClasses="order-table-odd-row,order-table-even-row" border="1" > 
        <h:column>
            <f:facet name="header">ID producenta</f:facet>
            <h:inputText value="#{p.getId}"/>
        </h:column>

        <h:column>
            <f:facet name="header">Nazwa producenta</f:facet>
            <h:inputText value="#{p.getNazwa}" />
        </h:column>

        <h:column>
            <f:facet name="header">NIP</f:facet>
            <h:inputText value="#{p.getNip}" />
        </h:column>

        <h:column>
            <f:facet name="header">REGON</f:facet>
            <h:inputText value="#{p.getRegon}" />
        </h:column>

        <h:column>
            <f:facet name="header">Miasto</f:facet>
            <h:inputText value="#{p.getMiasto}" />
        </h:column>

        <h:column>
            <f:facet name="header">Adres</f:facet>
            <h:inputText value="#{p.getAdres}" />
        </h:column>

        <h:column>
            <f:facet name="header">Telefon</f:facet>
            <h:inputText value="#{p.getTel}" />
        </h:column>

        <h:column>
            <f:facet name="header">E-mail</f:facet>
            <h:inputText value="#{p.getEmail}" />
        </h:column>
    </h:dataTable>
</h:panelGrid>
        </h:form>
       </f:view>
    ...
   </body>
</html>

ProducentBean.java:

    public class ProducentBean extends Polacz implements Serializable {

   public String redirect() {
    return "dodaj_pr";
}
}

I was trying to do it in many ways, but I can't deal with it.

I also have an another question: is there in JSF a possibility to display a table dynamically from database, for example by choosing a table name selecting an option in ? My database contains three tables with different count of colums each.

I'll be very happy if somebody gives me some advices.

EDIT:

OK, I tried to do this:

private String dodajPrUrl = "dodaj_pr?faces-redirect=true";

public String getDodajPrUrl() {
    return this.dodajPrUrl;
}

public void setDodajPrUrl(String newUrl) {
    this.dodajPrUrl = newUrl;
}

and in index.jsp:

<h:commandButton action="#{producentBean.redirect }" value="Dodaj" />

It gives me still the same error.

EDIT2:

Stack trace:

SEVERE: javax.faces.FacesException: javax.el.PropertyNotWritableException: Illegal Syntax for Set Operation
javax.faces.FacesException: javax.el.PropertyNotWritableException: Illegal Syntax for  Set Operation
    at com.sun.faces.context.ExceptionHandlerImpl.handle(ExceptionHandlerImpl.java:142)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:119)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
    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$AdapterCallable.call(ContainerMapper.java:317)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:722)
Caused by: javax.faces.component.UpdateModelException: javax.el.PropertyNotWritableException: Illegal Syntax for Set Operation
    at javax.faces.component.UIInput.updateModel(UIInput.java:853)
    at javax.faces.component.UIInput.processUpdates(UIInput.java:735)
    at javax.faces.component.UIData.iterate(UIData.java:2001)
    at javax.faces.component.UIData.processUpdates(UIData.java:1253)
    at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1242)
    at javax.faces.component.UIForm.processUpdates(UIForm.java:281)
    at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1242)
    at javax.faces.component.UIViewRoot.processUpdates(UIViewRoot.java:1231)
    at com.sun.faces.lifecycle.UpdateModelValuesPhase.execute(UpdateModelValuesPhase.java:78)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    ... 26 more
Caused by: javax.el.PropertyNotWritableException: Illegal Syntax for Set Operation
    at com.sun.el.parser.AstValue.setValue(AstValue.java:207)
    at com.sun.el.ValueExpressionImpl.setValue(ValueExpressionImpl.java:291)
    at javax.faces.component.UIInput.updateModel(UIInput.java:818)
    ... 35 more
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Look at the stack trace. Here's the most important part:

Caused by: javax.faces.component.UpdateModelException: javax.el.PropertyNotWritableException: Illegal Syntax for Set Operation
    at javax.faces.component.UIInput.updateModel(UIInput.java:853)
    at javax.faces.component.UIInput.processUpdates(UIInput.java:735)
    at javax.faces.component.UIData.iterate(UIData.java:2001)
    at javax.faces.component.UIData.processUpdates(UIData.java:1253)
    at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1242)
    at javax.faces.component.UIForm.processUpdates(UIForm.java:281)
    at javax.faces.component.UIComponentBase.processUpdates(UIComponentBase.java:1242)
    at javax.faces.component.UIViewRoot.processUpdates(UIViewRoot.java:1231)
    at com.sun.faces.lifecycle.UpdateModelValuesPhase.execute(UpdateModelValuesPhase.java:78)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    ... 26 more

Read from bottom to top. During update model values phase, JSF is traversing the component tree starting from UIViewRoot component (<f:view>). In an UIForm component (<h:form>) there is an UIData component (<h:dataTable>) which has an UIInput component (<h:inputText>) which needs to be processed. The updateModel() basically needs to put the submitted, converted and validated value in the model (the managed bean). However, that operation has failed because the property is not writable (i.e. the setter method cannot be found based on the EL expression syntax).

Well, let's look at the properties of your <h:inputText> components in general.

<h:inputText value="#{p.getId}"/>
...
<h:inputText value="#{p.getNazwa}" />
...
<h:inputText value="#{p.getNip}" />

Wait, that's strange. They start all with "get"! This is definitely not normal. JSF is then looking for methods like setGetId(), setGetNazwa(), etc which just doesn't make sense (and you likely also don't have, given this exception). It's expected that they represent concrete property names like "id", "nazwa", "nip", etc and not full method names.

Thus, so in the model:

private Long id;
private String nazwa;
private String nip;

// Add/generate getters and setters in the following syntax:

public Long getId() {
    return id;
}

public void setId(Long id) {
    this.id = id;
}

// ...

And so in the view:

<h:inputText value="#{p.id}"/>
...
<h:inputText value="#{p.nazwa}" />
...
<h:inputText value="#{p.nip}" />

This is however already covered in a bit sane JSF book/tutorial/resource. Are you absolutely positive that you were reading the right one? Your question also shows that you're using JSF 2.0 in combination with the deprecated JSP view technology instead of its successor Facelets. Start at our JSF wiki page.


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