Question

i am trying to include a java code into the value of the inputText in my jsf page but an error occur

according to tld or attribute directive in tag file attribute value
does not accept any expressions

Here is my jsf page.

<%@ page contentType="text/html" %>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="html" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="core" %>
<%@ page language="java" %>
    <core:view>
    <html:form>
        <html:outputLabel value="Informations " style="FONT-SIZE: xx-large;"/>
        <br />&nbsp;
        <br />

        <%
final String property=System.getProperty("jboss.server.home.dir");
 %>
    <html:outputLabel value="Répertoire de configuration:  " />&nbsp;&nbsp;
<html:inputText value='<%=property%>'/>

    </html:form>
    </core:view>

Doesn ‘ t work either with double quote or nothing
How to resolve this problem please ?
Thank you very much

Answer 1

The problem is with this line of code:

<html:inputText value='<%=property%>'/>

JSF uses Expression Language to populate/read values to/from a JavaBean. You will have to create a POJO action (called ManagedBean) with a variable property and link it there.

E.g.

public class ConfigurationAction {

    private String property = System.getProperty("jboss.server.home.dir");

    /**NOTE: MUST create a getter and setter. **/
    public String getProperty() {
        return property;
    }

    public void setProperty(String property) {
        this.property = property;
    }
}

Don’t forget to map the ManagedBean. In JBoss Seam, you will just add an @Name annotation above the class like, @Name("configurationAction").

Finally, render this in JSF with Expression Language (EL)

<html:inputText value="#{configurationAction.property}"/>

Where configurationAction is the name of your ManagedBean, and property is the instance of the ManagedBean.