java.lang.IllegalArgumentException.Why?
Hi guys....
i'm a doubt and a problems but i'm not able to solve it!
Please help me...
I have a form in a jsp page of my jsf application in which i have to insert a login, a password and a team and there is a button that ,once clicked,performs authentication.I've developed a wrapper class with the 3forms as private variables and strings and everythings go well.
Now i want to change team input,giving the user the possibility to choice a value from a list based on a db query.
I've this error when i run the application
java.lang.IllegalArgumentException: Value binding'#{user.teams}'of UISelectItems with component-path{Component-Path : [Class: javax.faces.component.UIViewRoot,ViewId: /Login.jsp][Class: javax.faces.component.html.HtmlForm,Id: _id1][Class: javax.faces.component.html.HtmlPanelGrid,Id: _id2][Class: javax.faces.component.html.HtmlPanelGrid,Id: _id4][Class: javax.faces.component.html.HtmlSelectOneListbox,Id: _id17][Class: javax.faces.component.UISelectItems,Id: _id18]} does not reference an Object of type SelectItem, SelectItem[], Collection or Map but of type :null
org.apache.myfaces.shared_impl.util.SelectItemsIterator.hasNext(SelectItemsIterator.java:141)
org.apache.myfaces.shared_impl.renderkit.RendererUtils.internalGetSelectItemList(RendererUtils.java:477)
org.apache.myfaces.shared_impl.renderkit.RendererUtils.getSelectItemList(RendererUtils.java:453)
org.apache.myfaces.shared_impl.renderkit.html.HtmlRendererUtils.internalRenderSelect(HtmlRendererUtils.java:277)
org.apache.myfaces.shared_impl.renderkit.html.HtmlRendererUtils.renderListbox(HtmlRendererUtils.java:240)
org.apache.myfaces.shared_impl.renderkit.html.HtmlListboxRendererBase.encodeEnd(HtmlListboxRendererBase.java:73)
javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:720)
org.apache.myfaces.shared_impl.renderkit.RendererUtils.renderChild(RendererUtils.java:442)
org.apache.myfaces.shared_impl.renderkit.html.HtmlGridRendererBase.renderChildren(HtmlGridRendererBase.java:216)
org.apache.myfaces.shared_impl.renderkit.html.HtmlGridRendererBase.encodeEnd(HtmlGridRendererBase.java:98)
javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:720)
org.apache.myfaces.shared_impl.renderkit.RendererUtils.renderChild(RendererUtils.java:442)
org.apache.myfaces.shared_impl.renderkit.html.HtmlGridRendererBase.renderChildren(HtmlGridRendererBase.java:216)
org.apache.myfaces.shared_impl.renderkit.html.HtmlGridRendererBase.encodeEnd(HtmlGridRendererBase.java:98)
javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:720)
javax.faces.webapp.UIComponentTag.encodeEnd(UIComponentTag.java:623)
javax.faces.webapp.UIComponentTag.doEndTag(UIComponentTag.java:546)
com.sun.faces.taglib.html_basic.PanelGridTag.doEndTag(PanelGridTag.java:460)
org.apache.jsp.Login_jsp._jspx_meth_h_panelGrid_0(Login_jsp.java:245)
org.apache.jsp.Login_jsp._jspx_meth_h_form_0(Login_jsp.java:207)
org.apache.jsp.Login_jsp._jspx_meth_f_view_0(Login_jsp.java:159)
org.apache.jsp.Login_jsp._jspService(Login_jsp.java:102)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:322)
com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:130)
com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:87)
com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:117)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:198)
org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:670)
org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:637)
org.apache.jsp.index_jsp._jspService(index_jsp.java:43)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
my jsp page is simple
<h:form>
<h:panelGrid columns="2" border="0" cellpadding="3" cellspacing="3">
<h:graphicImage url="/images/logo.gif" alt="Welcome to ProjectTrack"
title="Welcome MicroArray" width="149" height="160"/>
<h:panelGrid columns="3" border="0" cellpadding="5" cellspacing="3"
headerClass="login-heading">
<f:facet name="header">
<h:outputText value="Welcome to MicroArray Application" />
</f:facet>
<h:messages globalOnly="true"/>
<h:outputLabel for="userNameInput">
<h:outputText value="Enter your user name:"/>
</h:outputLabel>
<h:inputText value="#{authenticationBean.loginName}">
<f:validateLength minimum="5" maximum="30"/>
</h:inputText>
<h:message for="userNameInput" styleClass="errors"/>
<h:outputLabel for="passwordInput">
<h:outputText value="Password:"/>
</h:outputLabel>
<h:inputSecret value="#{authenticationBean.password}">
<f:validateLength minimum="5" maximum="30"/>
</h:inputSecret>
<h:message for="passwordInput" styleClass="errors"/>
<h:outputLabel for="teamInput">
<h:outputText value="Team:"/>
</h:outputLabel>
<h:selectOneListbox value="#{user.teamname}">
<f:selectItems value="#{user.teams}"/>
</h:selectOneListbox>
<h:commandButton action="#{authenticationBean.login}" value="Login"/>
</h:panelGrid>
</h:panelGrid>
</h:form>
and my list of values is generated by
public List<SelectItem> teamList()throws SQLException{
try{
DataSource dataSource=Singleton.getInstance().getDataSource();
Connection conn2=dataSource.getConnection();
Statement stmt = conn2.createStatement();
ResultSet rst = stmt
.executeQuery("select * from researchteam order by teamname");
List<SelectItem> teams =new ArrayList<SelectItem>();
while (rst.next())
teams.add(new SelectItem(rst.getString("teamname"),rst.getString("teamname")));
rst.close();
conn2.close();
}
catch(Exception e){};
return teams;
}
what have i do?
Can you say me what code have i to add to run the application?
Please help me,give me help or examples....thanks very much
[8863 byte] By [
giubata] at [2007-10-3 1:30:27]
first check: ensure there are no null values coming back from the resultset - if there that may be the problem - it maybe the message is not as explicit as it could be
How does getTeams() look like?
private List<SelectItem> teams;
public List<SelectItem> getTeams() {
return teams;
}
public void setTeams(List<SelectItem> teams) {
this.teams = teams;
}
what can i check?
Please help me simply,i'm a new user of jsf and java but i'm crazying for this problem..........it seems there is no solution...
please help me...
how can i check that my query results is not null?
Doing the same query on mysql give me the right results....
when talking about null columns - do the following:
String teamName = rst("teamName").toString();
if(teamName != null){
.... create the new list item;
}
OR
change the query so that the results do not return rows that have a null value for teamName; if when you run the query in MySQL there are no teamName columns with null i.e. they are empty values, then this is not the problem.
sorry mistyped:String teamName = rst.getString("teamname");if(teamName != null)....
thanks veru much for your availability...but what can i do?what i have to write in else?Have i debug the code?Can you help me,it's the first times i work with java,Jsf and Eclipse....please help me...
ok, when you run the query in mysql - do you get any columns where the teamname has nothing in it - meaning its empty?
ok, so I went ahead and tried to break down your code - from what you posted it quickly became obvious - apologies for not spotting this - but the proof is always in the trying I guess - the problem is this - the function getTeams() return a null List object which has not been populated yet - although you have this function teamList() there is nowhere where this code gets executed to generate the list - this is what I have and ran succesfully - I took away the database side of things during my test but essentially the problem did not lie there:
public class Teams {
public Teams() {
}
public List<SelectItem> getTeams(){
return teamList();
}
public List<SelectItem> teamList() throws SQLException{
List<SelectItem> teams = null;
try {
teams = new ArrayList<SelectItem>();
// **** put in some code to get the connection and statement ****
teams = new ArrayList<SelectItem>();
Connection connection = null;
PreparedStatement ps = connection.prepareStatement("select * from researchteam order by teamname where teamname is not null");
ResultSet rst = ps.executeQuery();
while (rst.next()) {
String teamName = rst.getString("teamname");
teams.add(new SelectItem(teamName, teamName));
}
rst.close();
connection.close();
} catch(SQLException e_sql){
// log something
throw e_sql;
}
catch (Exception e)
{
// log something
}
return teams;
}
}
in your bean #{user.teams} - the beans getTeams function would get called which calls out to the teamList returning a list of SelectItems -
I downloaded the source for myfaces from http://people.apache.org/builds/myfaces/nightly/ and looked at where the problem resulted from - then looking at your code its quite clear you are a returning a null object from getTeams() - the setTeams function is not really required as it doesn't get called -
Have a look at the above and let me know if you have any more questions -
also I modified your query to return only rows where teamname has a value and I also used a preparedStatement instead so it gets precompiled and if you call the statement again it should be available in the cache
Lee
thanks very much paroconsult....
you're a new user but my only hope...
i have not understood everythings due to my java and jsf inexperience and poor english.
I've a User bean so made
package giu;
import java.io.Serializable;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import javax.faces.model.SelectItem;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.sql.DataSource;
public class User implements Serializable {
private static final long serialVersionUID = 1;
private String firstName;
private String lastName;
private String date;
private String city;
private String address;
private String profession;
private String email;
private String login;
private String password;
private String teamname;
private String role;
private Connection conn;
private List<SelectItem> teams;
public User() {};
public User(String login, String firstName, String lastName,
String password, String teamname, String role) {
this.login = login;
this.firstName = firstName;
this.lastName = lastName;
this.password = password;
this.teamname = teamname;
this.role = role;
}
public User(String login, String password, String teamname, String role) {
this.login = login;
this.password = password;
this.teamname = teamname;
this.role = role;
}
public void setLogin(String login) {
this.login = login;
}
public String getLogin() {
return login;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public void setPassword(String password) {
this.password = password;
}
public String getPassword() {
return password;
}
public void setTeamname(String teamname) {
this.teamname = teamname;
}
public String getTeamname() {
return teamname;
}
public void setRole(String role) {
this.role = role;
}
public String getRole() {
return role;
}
public String toString() {
return firstName + " " + lastName;
}
public java.lang.String getAddress() {
return address;
}
public void setAddress(java.lang.String address) {
this.address = address;
}
public java.lang.String getCity() {
return city;
}
public void setCity(java.lang.String city) {
this.city = city;
}
public java.lang.String getDate() {
return date;
}
public void setDate(java.lang.String date) {
this.date = date;
}
public java.lang.String getEmail() {
return email;
}
public void setEmail(java.lang.String email) {
this.email = email;
}
public java.lang.String getProfession() {
return profession;
}
public void setProfession(java.lang.String profession) {
this.profession = profession;
}
public java.sql.Connection getConn() {
return conn;
}
public void setConn(java.sql.Connection conn) {
this.conn = conn;
}
public String AddNewUser() throws SQLException {
try{
DataSource dataSource=Singleton.getInstance().getDataSource();
Connection conn=dataSource.getConnection();
if (conn != null) {
PreparedStatement pst = null;
pst = conn.prepareStatement("INSERT INTO user(username,password,teamname,type,firstname,lastname,city,birthdate,address,profession,email) VALUES (?,?,?,?,?,?,?,?,?,?,?)");
pst.setString(1, login);
pst.setString(2, password);
pst.setString(3, teamname);
pst.setString(4, role);
pst.setString(5, firstName);
pst.setString(6, lastName);
pst.setString(7, city);
pst.setString(8, date);
pst.setString(9, address);
pst.setString(10, profession);
pst.setString(11, email);
pst.executeUpdate();
pst.close();
conn.close();
}
}
catch(Exception e){};
return "addedUsr";
}
public List<SelectItem> getTeams() throws SQLException{
return teamList();
}
public List<SelectItem> teamList() throws SQLException{
List<SelectItem> teams = null;
try {
teams = new ArrayList<SelectItem>();
DataSource dataSource=Singleton.getInstance().getDataSource();
teams = new ArrayList<SelectItem>();
Connection connection =dataSource.getConnection();
PreparedStatement ps = connection.prepareStatement("select * from researchteam order by teamname where teamname is not null");
ResultSet rst = ps.executeQuery();
while (rst.next()) {
String teamName = rst.getString("teamname");
teams.add(new SelectItem(teamName, teamName));
}
rst.close();
connection.close();
} catch(SQLException e_sql){
// log something
throw e_sql;
}
catch (Exception e)
{
// log something
}
return teams;
}
what have i to do now?
Can you help me modifing my code where it's needed?
Can you help me with code to create this scrollable list in my jsp page?
I haven't understood clearly what i have to do....
you're my only hope....please help me
I'm not sure what you are asking - but you already have the xml code defined:
<h:selectOneListbox value="#{user.teamname}">
<f:selectItems value="#{user.teams}"/>
</h:selectOneListbox>
you should get the list from the code you have written and the xml.
