Just based on your working example, shouldn't you be using: <nested:iterate id="element2" property="urls">
with id="element2" instead of name="element2"? On Tue, 12 Oct 2004 19:49:28 +1000, Langdon Stevenson <[EMAIL PROTECTED]> wrote: > Hi > > I am trying to output the contents of a set of nested Objects in a JSP > page using the <nested> taglib. > > I have three objects that are persisted using Hibernate: > > 1. Student - (contains a HashSet of Project called 'projects') > 2. Project - (contains a HashSet of Url called 'urls') > 3. Url - (contains a string) > > The Hibernate persistance seems to require the use of HashSets for > sub-objects to work. I have tried using an ArrayList, but get Hibernate > errors. > > I set a student bean in session scope in my action and then pass control > to the jsp. The jsp looks something like: > > <nested:root name="adamh"> > <nested:iterate id="element1" property="projects"> > > <tr> > <td> > Name: > </td> > <td> > <nested:write name="element1" property="name"/> > </td> > </tr> > > <tr> > <td> > Query: > </td> > <td> > <nested:write name="element1" property="query"/> > </td> > </tr> > > </nested:iterate> > </nested:root> > > When I run the above jsp code, it works fine and prints the name and > query string of the project below the student details. However when I > add the second level of iteration like this: > > <nested:root name="adamh"> > > <nested:iterate id="element1" property="projects"> > > <tr> > <td> > Name: > </td> > <td> > <nested:write name="element1" property="name"/> > </td> > </tr> > > <tr> > <td> > Query: > </td> > <td> > <nested:write name="element1" property="query"/> > </td> > </tr> > > <nested:iterate name="element2" property="urls"> > <tr> > <td> > <nested:write name="element2" property="url"/> > </td> > </tr> > </nested:iterate> > > </nested:iterate> > </nested:root> > > I get the following error: > > javax.servlet.ServletException: Cannot find bean element2 in any scope > > This makes sense (sort of), but leaves me with little clue as to what I > should be doing instead. All of the examples that I can find of using > the <nested:iterate> tag say that I should use the form: > > COMPANY: <html:text property="companyName"/> > <nested:iterate property="departments"> > Department: <nested:text property="deptName"/> > <nested:iterate property="employees"> > Employee: <nested:text property="empName"/> > E-mail: <nested:text property="email"/> > </nested:iterate> > </nested:iterate> > > (this from the Struttin' with Struts tutorial - > http://www.reumann.net/struts/nested.do) > > However my reading of the iterate taglib docs say that with a HashTable > I must use the id="something" property="object property" form. As > mentioned, that works fine for one level of nesting, but not multiple > levels. > > Any suggestions as to how I should be modifying my JSP? Keeping in mind > that Hibernate appears to limit me to using a HashMap to store my nested > objects. I expect that there is a simple answer, but can't for the life > of me find it. > > I am using Struts 1.1 with Tomcat 4.0.6 / 4.1 on Win2k > > Full listing of relevent files below. > > Any assistance greatly appreciated. > > Regards, > Langdon > --------------------- > > -- Student.java -- > package adamh; > > import java.io.Serializable; > import java.util.Date; > import java.util.HashSet; > import java.util.Set; > > /** > * Created by IntelliJ IDEA. > * Student: langdons > * Date: 12/08/2004 > * Time: 18:58:49 > * To change this template use Options | File Templates. > */ > > public class Student implements Serializable { > private String id; > private String parentId; > private String emailAddress; > private String password; > private String nickname; > private String yearOfBirth; > private String country; > private String state; > private String gender; > private java.util.Date firstContact; > private String referredById; > private String agreeToRules; > private User user; > private Role role; > private Set projects = new HashSet(); > > public String getId() { > return id; > } > > public void setId(String string) { > id = string; > } > > public String getParentId() { > return parentId; > } > > public void setParentId(String string) { > parentId = string; > } > > public String getEmailAddress() { > return emailAddress; > } > > public void setEmailAddress(String string) { > emailAddress = string; > } > > public String getPassword() { > return password; > } > > public void setPassword(String string) { > password = string; > } > > public String getNickname() { > return nickname; > } > > public void setNickname(String string) { > nickname = string; > } > > public String getyearOfBirth() { > return yearOfBirth; > } > > public void setYearOfBirth(String string) { > yearOfBirth = string; > } > > public String getCountry() { > return country; > } > > public void setCountry(String string) { > country = string; > } > > public String getState() { > return state; > } > > public void setState(String string) { > state = string; > } > > public String getGender() { > return gender; > } > > public void setGender(String string) { > gender = string; > } > > public Date getFirstContact() { > return firstContact; > } > > public void setFirstContact(Date date) { > firstContact = date; > } > > public String getReferredById() { > return referredById; > } > > public void setReferredById(String string) { > referredById = string; > } > > public String getAgreeToRules() { > return agreeToRules; > } > > public void setAgreeToRules(String string) { > agreeToRules = string; > } > > public User getUser() { > return user; > } > > public void setUser(User user) { > this.user = user; > } > > public Role getRole() { > return role; > } > > public void setRole(Role role) { > this.role = role; > } > > public Set getProjects() { > return this.projects; > } > > public void setProjects(Set project) { > this.projects = project; > } > > public void addProject(Project project) { > project.setStudent(this); > projects.add(project); > } > > } > > -- Project.java -- > > package adamh; > > import java.util.Set; > import java.util.HashSet; > > /** > * Created by IntelliJ IDEA. > * User: langdons > * Date: 7/10/2004 > * Time: 20:39:14 > * To change this template use Options | File Templates. > */ > public class Project { > > private String id; > private String student_id; > private String name; > private String query; > private Student student; > private Set urls = new HashSet(); > > public String getId() { > return id; > } > > public void setId(String string) { > id = string; > } > > public String getStudent_id() { > return student_id; > } > > public void setStudent_id(String string) { > student_id = string; > } > > public String getName() { > return name; > } > > public void setName (String string) { > name = string; > } > > public String getQuery () { > return query; > } > > public void setQuery (String string) { > query = string; > } > > public void setStudent(Student student){ > this.student = student; > } > > public Student getStudent() { > return student; > } > > public Set getUrls() { > return urls; > } > > public void setUrls(Set set) { > this.urls = set; > } > > public void addUrls(Url url){ > url.getProjects().add(url); > urls.add(url); > } > } > > -- Url.java -- > > package adamh; > > import java.util.Set; > import java.util.HashSet; > > /** > * Created by IntelliJ IDEA. > * User: langdons > * Date: 7/10/2004 > * Time: 21:13:35 > * To change this template use Options | File Templates. > */ > > public class Url { > > private String id; > private String url; > private Set projects = new HashSet(); > > public String getId() { > return id; > } > > public void setId(String string) { > id = string; > } > > public String getUrl() { > return url; > } > > public void setUrl (String string) { > url = string; > } > > public Set getProjects () { > return this.projects; > } > > public void setProjects (Set set) { > this.projects = set; > } > } > > -- home.jsp -- > > <%@ taglib uri="/tags/struts-html" prefix="html" %> > <%@ taglib uri="/tags/struts-bean" prefix="bean" %> > <%@ taglib uri="/tags/struts-nested" prefix="nested"%> > > <html> > <head> > <title><bean:message key="studentHomePage.pageTitle" /></title> > > </head> > <body> > <h1><bean:message key="studentHomePage.pageHeader" /></h1> > > <table> > > <tr> > <td colspan=2> > <html:messages id="message" message="true"> > <%= message %> > </html:messages> > </td> > </tr> > > <tr> > <td> > <bean:message > key="studentRegistrationWizard.referredById" />: > </td> > <td> > <bean:write name="adamh" property="referredById" /> > </td> > </tr> > <tr> > <td> > <bean:message > key="studentRegistrationWizard.emailAddress" />: > </td> > <td> > <bean:write name="adamh" property="emailAddress" /> > </td> > </tr> > <tr> > <td> > <bean:message key="studentRegistrationWizard.password" />: > </td> > <td> > <bean:write name="adamh" property="password" /> > </td> > </tr> > <tr> > <td> > <bean:message key="studentRegistrationWizard.nickname" />: > </td> > <td> > <bean:write name="adamh" property="nickname" /> > </td> > </tr> > <tr> > <td> > <bean:message > key="studentRegistrationWizard.yearOfBirth"/> > </td> > <td> > <bean:write name="adamh" property="yearOfBirth" /> > </td> > </tr> > <tr> > <td> > <bean:message > key="studentRegistrationWizard.country"/> > </td> > <td> > <bean:write name="adamh" property="country" /> > </td> > </tr> > <tr> > <td> > <bean:message key="studentRegistrationWizard.state"/> > </td> > <td> > <bean:write name="adamh" property="state" /> > </td> > </tr> > <tr> > <td> > <bean:message key="studentRegistrationWizard.gender"/> > </td> > <td> > <bean:write name="adamh" property="gender" /> > </td> > </tr> > <tr> > <td> > Projects: > </td> > </tr> > > <nested:root name="adamh"> > <nested:iterate id="element1" property="projects"> > <tr> > <td> > Name: > </td> > <td> > <nested:write name="element1" property="name"/> > </td> > </tr> > <tr> > <td> > Query: > </td> > <td> > <nested:write name="element1" > property="query"/> > </td> > </tr> > > <nested:iterate name="element2" property="urls"> > <tr> > <td> > <nested:write name="element2" > property="url"/> > </td> > </tr> > </nested:iterate> > > <tr> > <td colspan="2"> > <hr> > </td> > </tr> > </nested:iterate> > </nested:root> > > </table> > </body> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
