jsf - How to avoid exception, <c:if> and <c:catch> -


i'm trying render page, there possibility el expressions generate exceptions. tryed first of all, sorround block < c:if> in such way shows code checking critical condition. saw in case of "error" page redirected again "http 500 - internal server error". tought maybe el expression inside block computed in case, if < c:if> block not shown. sorrounded block < c:catch> read block catch exceptions. added on methods declaration "throws exception". but, again, when critical condition not respected, page redirect 500 error page.

i post xhtml code:

<c:if test="#{!partybean.emptyset}">     <c:catch>      <p:panel id="panel" style="margin-bottom:10px;">              <f:facet name="header" >                         <h:outputlabel value="#{partybean.currentparty.name}" />             </f:facet>             <f:facet name="actions">                         <p:commandbutton id="asktojoin" styleclass="ui-panel-titlebar-icon "                      action="#{joinrequestbean.askforparty(partybean.currentparty)}" value="ask join"/>             </f:facet>              <f:facet name="footer" >                         <p:commandbutton id="pr" action="#{partybean.previus()}" value="previousparty" rendered="#{partybean.hasprevious()}">                         </p:commandbutton>                         <p:commandbutton id="nx" style="margin-right:10px" action="#{partybean.next()}" value="nextparty" rendered="#{partybean.hasnext()}">                         </p:commandbutton>             </f:facet>         <h:panelgrid columns="2">         <h:outputlabel  value="symbol:" />      <h:graphicimage value="#{('/partysymbols/'.concat(partybean.currentparty.symbol))}" width="200" height="171" />          <h:outputlabel for="program" value="program:" />         <h:outputlabel id="program" value="#{partybean.currentparty.program}" />        <h:link id="partyname" outcome="memberlist" value="memberlist">             <f:param  name="partyname" value="#{partybean.currentparty.name}" />          </h:link>     </h:panelgrid>  </p:panel> </c:catch> </c:if> <c:if test="#{partybean.emptyset}"> <h1>there no parties @ moment</h1></c:if> </h:form> </h:body>

and bean:

@managedbean(name="partybean") @sessionscoped public class partybean { @ejb private partymanagerlocal ejb;    private partydto[] party; int i=0;  @postconstruct private void init() {     i=0;     refresh(); } private void refresh(){     object[] list_o =       ejb.getlistofparty().toarray();     party = new partydto[list_o.length];     for(int i=0;i<list_o.length;i++){         party[i]=(partydto)list_o[i];     }     if(i>=list_o.length)         i=list_o.length; } public boolean isemptyset() {     refresh();     return party.length==0; } public string next() throws exception{     refresh();     if(i<party.length-1)     i++;     return "partyview.xhtml?faces-redirect=true"; } public string previus() throws exception{     refresh();     if(i>0)         i--;     return "partyview.xhtml?faces-redirect=true"; } public boolean hasprevious(){     return i>=1; } public boolean hasnext(){     return i<party.length-1; } public partydto getcurrentparty() throws exception{     return party[i]; }  }

i apologize show whole code, have no idea mistake. apologize horrible code, @ moment need works.

the critical condition array should not empty. happen array empty in case, need advise user it, instead redirect 500 error page.

thankyou in advance, samuele

you encapsulate want conditionally surrounding code in panelgroup , using rendered attribute.

example

<h:panelgroup rendered="#{partybean.isemptyset}">  <!-- code inside here... -->  <!-- render if isemptyset returns true -->   </h:panelgroup>

Comments

Post a Comment

Popular posts from this blog

commonjs - How to write a typescript definition file for a node module that exports a function? -

consider, toml node module can use: // toml.d.ts declare module toml { export function parse(value:string):any; } declare module "toml" { export = toml; } then: /// <reference path="../../../../../defs/toml/toml.d.ts"/> import toml = require('toml'); toml.parse(...); however, node module export single function, such 'glob' ( https://github.com/isaacs/node-glob ). the node usage of module be: var glob = require("glob") glob("*.js", {}, callback(err, files) { ... }); you'd naively expect this: // glob.d.ts declare function globs(paths:string, options:any, callback:{(err:any, files:string[]):void; ...but because typescripts 'import' semantics bit strange, seems can use 'import .. = require()' statement alias modules . trying call: /// <reference path="../../../../../defs/glob/glob.d.ts"/> import blog = require('glob'); results in: error ts2072: mod...
Read more

openid - Okta: Failed to get authorization code through API call -

i'm integrating okta own idp server using okta's api. i'm implementing authorization code flow following steps below: in own server, use /api/v1/authn endpoint sessiontoken. use sessiontoken obtain authorization calling endpoint: /oauth2/v1/authorize?client_id=" + clientid + "&sessiontoken=" + sessiontoken + "&response_type=code&response_mode=query&scope=openid&redirect_uri=" + redirecturl + "&state=evanyang&nonce=" it's supposed return response status code 302 , location header containing redirect url code value. however, keep getting response status code 200 , without location header, html body saying "you using unsupported browser." , "javascript disabled on browser." according api documentation: http://developer.okta.com/docs/api/resources/oidc.html#authentication-request , sessiontoken parameter sufficient this: an okta one-time sessiontoken. allows api-based ...
Read more

ios - Change Storyboard View using Seague -

i have following code checks connection server, , depending on want change views if no connection found. nsstring *connect = [nsstring stringwithcontentsofurl:[nsurl urlwithstring:@"http://myserver.com"] encoding:nsutf8stringencoding error:nil]; if (connect == null) { [self performseguewithidentifier:@"network_failure" sender:self]; } else { // other code here } my problem not change views. have added storyboard segue between 2 views identifier of network_failure . not have navigation controller or that, problem? thanks help! no not problem. first of all, in objectivec exists nil object oriented null . must use that. so: if(connect == nil) or better: if(!connect) so due fact nil not same of null , probably code does't enter in if scope . you have been able discover breakpoint. anyway: be sure set trigger segue (line) 2 view controller , , name network_failure (that not best name. should instead view1toview2 ) as, m...
Read more