Hi,
In one page of my application i am trying to iterate through one collection
for populating one combo box. But it is showing
"javax.servlet.jsp.JspException: Cannot create iterator for this collection"
....
I have one LoginForm that extends Validator form and it containg one object
of User. This user object contains a List of user roles .Actually i am
trying to display these user roles in my combo box in the jsp page. My code
is below.
I am using struts 1.3 for develping this project ...
Please help me
My form class is below...
public class Loginform extends ValidatorForm{
public String userName;
public String passWord;
public User user = new User();
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassWord() {
return passWord;
}
public void setPassWord(String passWord) {
this.passWord = passWord;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
/**
* Reset all properties to their default values.
*
* @param mapping The mapping used to select this instance
* @param request The servlet request we are processing
*/
public void reset(ActionMapping mapping, HttpServletRequest request) {
super.reset(mapping, request);
userName = "";
passWord= "";
}
}
User object is
public class User implements Serializable{
public String userid = "Ashli";
public String userName = "Ashli Isaac";
public String passWord = "123456";
public String userNumber = "1001";
public List<String> userRoles = new ArrayList<String>();
public String loginStatus;
public String riskCounter;
public User(){
userRoles.add("Admin User");
userRoles.add("Trial User");
userRoles.add("BackUP User");
userRoles.add("Super User");
}
public List<String> getUserRoles() {
return userRoles;
}
public void setUserRoles(List<String> userRoles) {
this.userRoles = userRoles;
}
the code snippet for iteration in jsp is
<tr>
<td width="30%">
<logic:iterate id="results" name="loginForm"
property="user">
<bean:define id="result" name="results"
property="userRoles">
<bean:write name="result"/>
</bean:define>
</logic:iterate>
</td>
My exception stack trace is
SEVERE: Servlet.service() for servlet jsp threw exception
javax.servlet.jsp.JspException: Cannot create iterator for this collection
at
org.apache.struts.taglib.logic.IterateTag.doStartTag(IterateTag.java:275)
at org.apache.jsp.jsp.welcome_jsp._jspService(welcome_jsp.java:193)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630)
at
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
at
org.apache.struts.chain.commands.servlet.PerformForward.handleAsForward(PerformForward.java:113)
at
org.apache.struts.chain.commands.servlet.PerformForward.perform(PerformForward.java:96)
at
org.apache.struts.chain.commands.AbstractPerformForward.execute(AbstractPerformForward.java:54)
at
org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at
org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at
org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)
Jan 14, 2009 9:07:41 PM
org.apache.struts.chain.commands.AbstractExceptionHandler execute
WARNING: Unhandled exception
org.apache.jasper.JasperException: An exception occurred processing JSP page
/jsp/welcome.jsp at line 99
96: Login
Status
97: </td>
98: <td width="30%">
99: <logic:iterate
id="results" name="loginForm" property="user">
100:
<bean:define id="result" name="results" property="userRoles">
101:
<bean:write name="result"/>
102:
</bean:define>
Stacktrace:
at
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:505)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:398)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630)
at
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
at
org.apache.struts.chain.commands.servlet.PerformForward.handleAsForward(PerformForward.java:113)
at
org.apache.struts.chain.commands.servlet.PerformForward.perform(PerformForward.java:96)
at
org.apache.struts.chain.commands.AbstractPerformForward.execute(AbstractPerformForward.java:54)
at
org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at
org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at
org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)
Caused by: javax.servlet.ServletException: javax.servlet.jsp.JspException:
Cannot create iterator for this collection
at
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:852)
at
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:781)
at org.apache.jsp.jsp.welcome_jsp._jspService(welcome_jsp.java:368)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
... 33 more
Caused by: javax.servlet.jsp.JspException: Cannot create iterator for this
collection
at
org.apache.struts.taglib.logic.IterateTag.doStartTag(IterateTag.java:275)
at org.apache.jsp.jsp.welcome_jsp._jspService(welcome_jsp.java:193)
... 36 more
Jan 14, 2009 9:07:41 PM org.apache.struts.chain.commands.ExceptionCatcher
postprocess
WARNING: Exception from exceptionCommand 'servlet-exception'
org.apache.jasper.JasperException: An exception occurred processing JSP page
/jsp/welcome.jsp at line 99
96: Login
Status
97: </td>
98: <td width="30%">
99: <logic:iterate
id="results" name="loginForm" property="user">
100:
<bean:define id="result" name="results" property="userRoles">
101:
<bean:write name="result"/>
102:
</bean:define>
Stacktrace:
at
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:505)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:398)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630)
at
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
at
org.apache.struts.chain.commands.servlet.PerformForward.handleAsForward(PerformForward.java:113)
at
org.apache.struts.chain.commands.servlet.PerformForward.perform(PerformForward.java:96)
at
org.apache.struts.chain.commands.AbstractPerformForward.execute(AbstractPerformForward.java:54)
at
org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at
org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at
org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)
Caused by: javax.servlet.ServletException: javax.servlet.jsp.JspException:
Cannot create iterator for this collection
at
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:852)
at
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:781)
at org.apache.jsp.jsp.welcome_jsp._jspService(welcome_jsp.java:368)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
... 33 more
Caused by: javax.servlet.jsp.JspException: Cannot create iterator for this
collection
at
org.apache.struts.taglib.logic.IterateTag.doStartTag(IterateTag.java:275)
at org.apache.jsp.jsp.welcome_jsp._jspService(welcome_jsp.java:193)
... 36 more
Jan 14, 2009 9:07:41 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet action threw exception
javax.servlet.jsp.JspException: Cannot create iterator for this collection
at
org.apache.struts.taglib.logic.IterateTag.doStartTag(IterateTag.java:275)
at org.apache.jsp.jsp.welcome_jsp._jspService(welcome_jsp.java:193)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630)
at
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
at
org.apache.struts.chain.commands.servlet.PerformForward.handleAsForward(PerformForward.java:113)
at
org.apache.struts.chain.commands.servlet.PerformForward.perform(PerformForward.java:96)
at
org.apache.struts.chain.commands.AbstractPerformForward.execute(AbstractPerformForward.java:54)
at
org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at
org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at
org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)
Thanks and Regards,
Crazy Worker
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