Please provide an solution for the problem i am facing when i call a method from my action button and retrieving data in a bean passing the result set to the target page is giving me an class cast exception with an message could not convert from ArrayList to
String,but i return a String in stead of ArrayList target page is displaying,but with ArrayList as return parameter i am having Problem,here is the snippet of code i am using,
Error Description:-
com.sun.faces.lifecycle.InvokeApplicationPhase execute java.util.ArrayList incompatible with java.lang.String
java.lang.ClassCastException: java.util.ArrayList incompatible with java.lang.String
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:73)
package roseindia;
import java.sql.*;
import java.util.*;
public class TableBean {
Connection con ;
Statement ps;
ResultSet rs;
private List perInfoAll = new ArrayList();
public List getperInfoAll() {
int i = 0;
try
{
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/userdetails","root","root");
ps = con.createStatement();
rs = ps.executeQuery("select * from user");
while(rs.next()){
System.out.println(rs.getString(1));
perInfoAll.add(i,new perInfo(rs.getString(1),rs.getString(2),rs.getString(3)));
i++;
}
}
catch (Exception e)
{
System.out.println("Error Data : " + e.getMessage());
}
return perInfoAll;//If i return String here target page is getting displayed,but with the List getting error page.
}
public class perInfo {
String uname;
String firstName;
String lastName;
public perInfo(String firstName,String lastName,String uname) {
this.uname = uname;
this.firstName = firstName;
this.lastName = lastName;
}
public String getUname() {
return uname;
}
public String getFirstName() {
return firstName;
}
public String getLastName() {
return lastName;
}
}
}
JSF page as below,
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<f:view><html>
<head>
</head>
<body>
<center>
<h:dataTable id="dt1" value="#{tableBean.perInfoAll}" var="item" bgcolor="#F1F1F1" border="10" cellpadding="5" cellspacing="3" rows="4" width="50%" dir="LTR" frame="hsides" rules="all" summary="This is a JSF code to create dataTable." >
<f:facet name="header">
<h:outputText value="This is 'dataTable' demo" />
</f:facet>
<h:column>
<f:facet name="header">
<h:outputText value="First Name" />
</f:facet>
<h:outputText style="" value="#{item.firstName}" ></h:outputText>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Last Name"/>
</f:facet>
<h:outputText value="#{item.lastName}"></h:outputText>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="Username"/>
</f:facet>
<h:outputText value="#{item.uname}"></h:outputText>
</h:column>
<f:facet name="footer">
<h:outputText value="The End" />
</f:facet>
</h:dataTable>
</center>
</body></html></f:view>
faces-config.xml
<?xml version="1.0"?>
<!DOCTYPE faces-config PUBLIC
"-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.0//EN"
"http://java.sun.com/dtd/web-facesconfig_1_0.dtd">
<managed-bean>
<managed-bean-name>table</managed-bean-name>
<managed-bean-class>search.TableBean</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
<navigation-rule>
<from-view-id>/searchclient.jsp</from-view-id>
<navigation-case>
<to-view-id>/clientSearchResults.jsp</to-view-id>
</navigation-case>
</navigation-rule>
