I have an Eclipse RAP 2.3 application with two entry points, say /first and /second.
In the GUI of the first entry point, there is a button with which I would like to open the second entry point in a new browser tab. The event handler of that button is currently
UrlLauncher launcher = RWT.getClient().getService( UrlLauncher.class );
launcher.openURL( "/second");
This already doesn't work when the application is deployed as myapp.war in a Tomcat web server (should then be /myapp/second).
My questions:
What's the best way to determine the URL to open within the event handler?
Do I have to fetch the HttpServletRequest, get the context path and so some string manipulation?
Is it actually safe to call RWT.getRequest() at this point?
Update
According to Rüdiger's comment I can acquire the context path in two different ways.
The first approach is
RWT.getRequest().getContextPath();
where RWT.getRequest() is documented with
This method is not recommended
Secondly, I could obtain it with
ApplicationContextImpl ac = (ApplicationContextImpl) RWT.getApplicationContext();
String contextPath = ac.getServletContext().getContextPath();
where the IDE displays the warning
Discouraged access: The type ApplicationContextImpl is not accessible due to restriction on required library ...\org.eclipse.rap.rwt_2.3.2.20150128-1013.jar
Despite the warning, it still works when deploying a WAR file with OSGi bundles to Tomcat.
So, in both cases there is some kind of warning, which makes the solutions look rather like workarounds.
Using RWT.getRequest() is not recommended because usually RWT would shield you from the lower-level servlet API and certain direct interactions with the request could even interfere with RWTs life cycle and yield funny responses.
While in your case it would be safe to access the ServletContext via RWT.getRequest(), I recommend to use
RWT.getUISession( display ).getHttpSession().getServletContext();
to access the servlet context.
The second approach accesses internal classes that aren't part of the public API and therefore shouldn't be use. The accessed classes may change or be (re)moved in the future without further notice and break your application.
Related
I need to update a javaEE application (still in java 1.7) that provides a SOAP web service. And I'd like to disable the TIMESTAMP_CACHE that wss4j (v2.0.2) uses to control reply attacks. It creates too many files and the OS reaches the maximum open files allowed, repeatedly. The files start to appear, one for each request that has been made and are named in the following way:
wss4j%002etimestamp%002ecache-e%0058ga%0058l%0058%004b%0057g%004ah%0050w==.data
The documentation states that the TIMESTAMP_CACHE can be changed (or so I understand):
ConfigurationConstants.ENABLE_TIMESTAMP_CACHE ("enableTimestampCache"): Whether to cache Timestamp Created Strings (these are only cached in conjunction with a message Signature). The default value is "true".
I've found many examples to change some of these ConfigurationConstants when a client application creates the Call object. See an example to change the PASSWORD_TYPE constant:
Service service = new Service();
Call call = (Call) service.createCall();
...
call.setProperty(UsernameToken.PASSWORD_TYPE, WSConstants.PASSWORD_TEXT);
call.setProperty(WSHandlerConstants.USER,"werner");
However, my application is not on the client side but on the server side and I haven't found so far the way to change the ENABLE_TIMESTAMP_CACHE constant.
Any idea?
I couldn't find a way to disable the timestamp cache. However, the wss4j behaviour described above happened to be a bug that not only resulted in lots of open files but in lots of open threads. It has already been fixed in version 2.0.9. Upgrading to the "newer" version did the trick.
You can find here the discussion in full that drove to the bug discovery and here the fix in wss4j's jira
I try to create the entity like this:
DatastoreService ds = DatastoreServiceFactory.getDatastoreService();
Entity stock = new Entity("Stock", 1);
stock.setProperty("Stock", "FCB");
ds.put(stock);
but keep getting the error:
No source code is available for type com.google.appengine.api.datastore.DatastoreService; did you forget to inherit a required module?
The error means just what it says, the GWT compiler needs access to the Java source it compiles to Javascript, and obviously DatastoreService is not something that should exist on the frontend - so you have an architecture issue here.
You'll need to write a proxy that can call a server component (Which in turns calls the DatastoreService) and returns DTOs/value objects (that you define and thus have the source for).
Cheers,
No source code is available
GWT transliterate Java to Javascript, reading it's source code and there a limited language support.
What you're trying to achieve is a Server only operation and you're adding this operation within the client code, which will run on a browser. Neither GAE allow this or GWT has the source of these classes nor capability to do so.
Solution
You need to create a request to your server that will access the DatastoreService , the return the output to the client code.
Below a example of a properly architect GWT web application:
the problem is: my web application uses ZK, which automatically generates random UUID for each web element.
When I try to record some basic test-case with Selenium IDE, it automatically tries to use these randomly-generated ID's, without even giving me a good alternative.
Is there a way to forbid Selenium IDE to use IDs while locating elements?
Possible workaraounds:
Implement ID generator in ZK: I've thrown away this possibility, because the application GUI is too complex for this task, and ID should be unique for whole sesion, which make this workaraound really hard to implement, when you have same elements on different page.
Find another recording tool: I've only found XLT script developer, which does the work by writing DOM-path using classes (which zk gives plenty) - but sometimes the location strategy gives false path, which is then not reproducible. Any good alternatives here?
You can change locater builder by changing the order of the locater in options>locater builder.
For example if you want to give first preference to css: name drag it on the top so when you start recording it will first give the preference to css name
Hope this will help you
My problem:
I have web project which implements NServicebus and should listen to messages.
Trying to keep my solution tidy I set up a different project for all my messagehandlers.
I now find that these messagehandlers do not get "hit" with messages.
To my understanding NServicebus scans all dll's in the debug folder of the web project to find any classes implementing IHandleMessages<>.
I referenced the messagehandlers class library project in my webproject and it appears in my debug folder, however it does not seem to get hit.
What does work
In a console sample project the inclusion of a referenced project which contains messagehandlers works as expected.
In my web app it works when I move my
messaghandlers to the web app project itself.
Reading through the website http://docs.particular.net/nservicebus/hosting/nservicebus-host/ I found that there are overloads for the Configure.With() method.
However:
I do not know if I need them. They text only seem to suggest that
this will limit the places where NServicebus looks for the
implementations of the interface.
these overloads do not exist in the Configure.WithWeb method which I'm using.
I can solve my problem by moving all the messagehandlers to my web project, but this does not seem like the best solution.
Am I missing something here?
When using NServiceBus in a web project, use NServiceBus.Configure.WithWeb() instead of NServiceBus.Configure.With().
Also, in order to load message handlers in a web application, you need to include the .LoadMessageHandlers() line after .UnicastBus() as described in Hosting NServiceBus in your own Process. Otherwise any IHandleMessages<T> implementations are not loaded and your web application operates as a send-only endpoint.
I'm working on a GWT project and I find it very tedious to have to add a function to my servlet, then copy and paste the function signature into my Service interface, then copy and paste it into my ServiceAsync interface and change the return parameter to be a callback. Is there a tool or a setting where I can just add public methods to my class and they can get copied into the other interfaces? Even if its not automatic it would be nice to be able to select specific methods and have them copied automatically.
I'm using eclipse and ideally it would update my interface each time I save implementation since thats when it checks my code and complains that my changes break the interface.
If you add the method to your *Service interface, then Eclipse can auto-generate the method ("Add unimplemented methods...") in your *ServiceImpl servlet, which you can then just fill in. Also, if you've got the Google Eclipse plugin installed, it will underline the new method in your *Service interface and complain that it's not in the *ServiceAsync. It might have a CTRL + 1 option to generate it in that interface as well.
You don't really need a tool. Just factor out the many RPC methods by just one method that takes a Request/Response. all you need to do is create subclasses of Request/Response and you don't need to think about adding new methods in the 2 interfaces.
You can use Google Guice on the server side to map the incomming request to a class handling the call... or you could use a visitor approach to forward the incoming request to the code handling the request (without resorting on a big instanceof construct).
Instantiations WindowBuilder GWT Designer does exactly what you are looking for.
The RemoteService Wizard will create all three files at the same time as well as keep them in sync as you make changes.
http://www.instantiations.com/windowbuilder/gwtdesigner/index.html
FWIW - I am only a user/purchaser of this product. I am not employed or in any other way related to Instantiations.