Help! I tried to make a Logout link and it keeps taking to /UIDL.

Rob5 · February 25, 2011, 2:58am

I’m creating an application that uses the the Google App Engine login functionality with UserService.createLoginURL()…etc.

It’s able to create proper login URLs that work when I click on them. But when I use UserService.createLogoutURL()… with the same method:

linkLogout.setResource(new ExternalResource(userService.createLogoutURL(request.getRequestedURI()));

then when I click this link in the app, it takes me to:

and shows me all this UIDL code.

for(;;);[{“changes”:[[“change”,{“format”: “uidl”,“pid”: “PID0”},[“0”,{“id”: “PID0”,“height”: “914px”,“width”: “1680px”,“caption”: “Getting to G-Saudi”,“name”: “1”,“theme”: “”,“resizable”:true,“main”:true,“layoutRelativeHeight”:true,“layoutRelativeWidth”:true,“v”:{“scrollLeft”:0,“scrollTop”:0,“positionx”:-1,“positiony”:-1,“close”:false}},[“1”,{“id”: “PID11”,“height”: “100.0%”,“width”: “100.0%”,“margins”:0},[“cc”,{“css”: “top:0.0px;left:10.0px;”},[“2”,{“id”: “PID12”,“mode”: “xhtml”},[“data”,{},[“div”,{“xmlns”: “http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd”},“
Hello! Coming to G-Saudi?</h1>”]
]]],[“cc”,{“css”: “top:40.0px;left:40.0px;”},[“2”,{“id”: “PID13”,“mode”: “xhtml”},[“data”,{},[“div”,{“xmlns”: “http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd”},“
Let’s help you get there.</h3>”]
]]],[“cc”,{“css”: “top:166.0px;left:360.0px;”},[“4”,{“id”: “PID14”,“height”: “252px”,“width”: “375px”,“rows”:2,“multiline”:true,“v”:{“text”:“”}}]
],[“cc”,{“css”: “bottom:14.0px;left:13.0px;”},[“3”,{“id”: “PID15”,“height”: “14px”,“caption”: “Click here to log out.”,“src”: “/_ah/logout?continue=%2F_ah%2Flogout%3Fcontinue%3D%252FUIDL”}]
]],[“notifications”,{},[“notification”,{“caption”: “End Transaction”,“position”:1,“delay”:0}]
,[“notification”,{“caption”: “Start Transaction”,“position”:1,“delay”:0}]
,[“notification”,{“caption”: “End Transaction”,“position”:1,“delay”:0}]
,[“notification”,{“caption”: “Start Transaction”,“position”:1,“delay”:0}]
]]]], “meta” : {}, “resources” : {}, “typeMappings” : { “com.vaadin.ui.Window” : 0 , “com.vaadin.ui.AbsoluteLayout” : 1 , “com.vaadin.ui.Label” : 2 , “com.vaadin.ui.TextField” : 4 , “com.vaadin.ui.Link” : 3 }, “locales”:}]

Then my app is completely broken with no way to recover other than the back button or reloading it back to localhost:8888.

Does anyone know why the link is creating this UIDL broken link and how to fix it??

David3 · February 25, 2011, 5:03pm

I have to say I have no idea what you are doing, but it could that I’ve noted when I use the request object’s path as part of my builders, I generally have to use URLs that take me “up one directory level” to get to my context path’s root, so if my login page is /contextpath/login.jsp, you may want to define the page as “…/login.jsp” rather than “login.jsp” or “./login.jsp” as the UIDL is generally handled by the vaadin path.

Henri2 · February 25, 2011, 8:47pm

Rob albert Ritchey:

It’s able to create proper login URLs that work when I click on them. But when I use UserService.createLogoutURL()… with the same method:
linkLogout.setResource(new ExternalResource(userService.createLogoutURL(request.getRequestedURI()));
then when I click this link in the app, it takes me to:

localhost:8888/UIDL

That might not be the issue here, but in case you are using Vaadin 6.4.9, upgrade to either 6.4.10 or 6.5.x - there was a bug in 6.4.9 that does cause the UIDL URL to be treated incorrectly in certain cases.

If that is not the problem, check what UserService.createLogoutURL() does - the request your servlet is processing here is actually an asynchronous UIDL request, and the UIDL page is not a good logout page but you should point to the “root” of the servlet context path.

Rob5 · February 26, 2011, 6:35pm

Thanks all. I don’t have much time to respond to individual answers as I’m working on a tight deadline but will respond back later.

Long story short, I did have to change the link location from “getRequestedURI()” to “/”, and now it works, as someone suggested. Sorry my question was a bit confusing. ttyl