Is it true that javax.inject annotations can function as direct replacements for com.google.inject?

So that, if I replaced all my current guice/gin annotations with those from javax.inject, my app would compile and run just fine?

First, does javax.inject cover all the bases that google.inject cover?

Replacing com.google.inject with javax.inject

I need to build a GWT application that will be called by an external application with specific URL parameters. 

For example: 

http://www.somehost.com/com.app.client.Order.html?orderId=99999.

How do I capture the orderId parameter inside the GWT application? 

GWT: Capturing URL parameters in GET request

I was wondering what are the possible user.agent values in gwt.xml. I found some of them but unfortunately not the complete list.&lt;p&gt;

 - Chrome - safari
 - Firefox - gecko1_8
 - Internet Explorer 6 - ie6 

What are the others?? Opera, ie7, ie8, ... etc.



What are the possible user.agent values in gwt.xml?

I am trying to run GWT RequestFactory and facing this error:

    ClassNotFoundException: org.slf4j.LoggerFactory

I have tried to download *slf4j-api-1.3.1.jar* but it didnt resolve the issue 

Any idea exactly which jar I need to download ?

ClassNotFoundException: org.slf4j.LoggerFactory

Does anyone know of a good guide for creating a project with the new 2.0 release of GWT using maven and eclipse? I am running into a lot of problems getting them to play nicely together. 

For what it&#39;s worth, I can create a gwt project using the maven eclipse plugin which works fine, but porting it to maven doesn&#39;t work (so a guide for this would be great). 

Likewise, I can use the maven plugin (gwt-maven-plugin), but when I import it to eclipse (import -&gt; materialize maven projects), it does not get recognised as a GWT project...

Thanks 

Maven GWT 2.0 and Eclipse

Can anyone suggest whether &quot;GWT&quot; or &quot;Vaadin&quot; are a better choice to design an application?    Also: what are the differences in coding style?    

Differences between GWT and Vaadin

We&#39;re starting to make heavier use of GWT in our projects, and the performance of the GWT compiler is becoming increasingly annoying. 

We&#39;re going to start altering our working practices to mitigate the problem, including a greater emphasis on the hosted-mode browser, which defers the need to run the GWT compiler until a later time, but that brings its own risks, particularly that of not catching issues with real browsers until much later than we&#39;d like.

Ideally, we&#39;d like to make the GWT compiler itself quicker - a minute to compile a fairly small application is taking the piss. However, we are using the compile if a fairly naive fashion, so I&#39;m hoping we can make some quick and easy gains.

We&#39;re currently invoking com.google.gwt.dev.Compiler as a java application from ant Ant target, with 256m max heap and lots of stack space. The compiler is launched by Ant using fork=true and the latest Java 6 JRE, to try and take advantage of Java6&#39;s improved performance. We pass our main controller class to the compiler along with the application classpath, and off it goes.

What else can we do to get some extra speed? Can we give it more information so it spends less time doing discovery of what to do?

I know we can tell it to only compile for one browser, but we need to do multi-browser testing, so that&#39;s not really practical.

All suggestions welcome at this point.

How do I speed up the gwt compiler?

When browsing the source code of Guava, I came across the following piece of code (part of the implementation of `hashCode` for the inner class `CartesianSet`):

    int adjust = size() - 1;
    for (int i = 0; i &lt; axes.size(); i++) {
        adjust *= 31;
        adjust = ~~adjust;
        // in GWT, we have to deal with integer overflow carefully
    }
    int hash = 1;
    for (Set&lt;E&gt; axis : axes) {
        hash = 31 * hash + (size() / axis.size() * axis.hashCode());

        hash = ~~hash;
    }
    hash += adjust;
    return ~~hash;

Both of `adjust` and `hash` are `int`s. From what I know about Java, `~` means bitwise negation, so `adjust = ~~adjust` and `hash = ~~hash` should leave the variables unchanged. Running the small test (with assertions enabled, of course),

    for (int i = Integer.MIN_VALUE; i &lt; Integer.MAX_VALUE; i++) {
        assert i == ~~i;
    }

confirms this. Assuming that the Guava guys know what they are doing, there must be a reason for them to do this. The question is what?

**EDIT** As pointed out in the comments, the test above doesn&#39;t include the case where `i` equals `Integer.MAX_VALUE`. Since `i &lt;= Integer.MAX_VALUE` is always true, we will need to check that case outside the loop to prevent it from looping forever. However, the line

    assert Integer.MAX_VALUE == ~~Integer.MAX_VALUE;

yields the compiler warning &quot;Comparing identical expressions&quot;, which pretty much nails it.

What is the meaning of double tilde (~~) in Java?

I&#39;m at the beginning/middle of a project that we chose to implement using GWT. Has anyone encountered any major pitfalls in using GWT (and GWT-EXT) that were unable to be overcome? How about from a performance perspective?

A couple things that we&#39;ve seen/heard already include:

  - Google not being able to index content
  - CSS and styling in general seems to be a bit flaky

Looking for any additional feedback on these items as well. Thanks!

Biggest GWT Pitfalls?

Is there any way to pass class as a parameter in Java and fire some methods from that class?

    void main()
    {
        callClass(that.class)
    }
    
    void callClass(???? classObject)
    {
        classObject.somefunction
        // or 
        new classObject()
        //something like that ?
    }

I am using Google Web Toolkit and it does not support reflection.

How do I pass a class as a parameter in Java?

I am looking among the standard libraries (like apache commons, jax, jboss, javax) for an interface or enum that lists the values of all the standard mime-type (aka content-type).

This interface should not be encumbered with too deep with other classes that would make it difficult to include the whole bunch as gwt source code.

for example

    interface ContentType{
      String JSON = &quot;Application/JSON&quot;;
      blah ... blah ...
    }

or,

    enum ContentType{
      JSON(&quot;Application/JSON&quot;),
      blah ... blah ...
    }




Interface/enum listing standard mime-type constants

Question for all the GWT gurus out there - which is the best GWT widgets library out there? And why?

List based on the answers:

 - [Default][2]
 - [Sencha GXT][3]
 - [Smart GWT][4]
 - [Vaadin][5]
 - [GWT-Bootstrap][6]
 - [GwtBootstrap3][7]
 - [Rocket GWT][8] (inactive)
 - [Tatami][9] (inactive)
 - [ErraiFramework][10]
 - [GWTMaterialDesign][14]

И наконец- новое поколение основанное на &lt;a href=&quot;http://ronanquillevere.github.io/2014/02/02/GWT-futur-javascript-interop.html#.VmCsmHYrJhE&quot;&gt;JsInterop&lt;/a&gt;:

 - [GWT + Polymer Elements][11]
 - [GWT + Polymer][12]
 - [Angular and GWT][13]
 - [GWTMaterialDesign][14]


  [2]: http://www.gwtproject.org/
  [3]: http://extjs.com/products/gxt/
  [4]: https://github.com/isomorphic-software/smartgwt
  [5]: http://vaadin.com/
  [6]: http://gwtbootstrap.github.io/
  [7]: https://github.com/gwtbootstrap3/gwtbootstrap3
  [8]: http://code.google.com/p/rocket-gwt/
  [9]: http://code.google.com/p/tatami/
  [10]: http://erraiframework.org/
  [11]: https://github.com/vaadin/gwt-polymer-elements
  [12]: https://vaadin.com/blog/-/blogs/use-gwt-widget-as-polymer-web-component
  [13]: https://github.com/jDramaix/AngularGwtExample
  [14]: https://github.com/GwtMaterialDesign/gwt-material

Best GWT widget library?

How can i send an Array with a HTTP Get request?

I&#39;m Using GWT client to send the request.

Send an Array with an HTTP Get

We are designing a URL system that will specify application sections as words separated by slashes.  Specifically, this is in GWT, so the relevant parts of the URL will be in the hash (which will be interpreted by a controller layer on the client-side):

    http://site/gwturl#section1/section2

Some sections may need additional attributes, which we&#39;d like to specify with a `:`, so that the section parts of the URL are unambiguous.  The code would split first on `/`, then on `:`, like this:

    http://site/gwturl#user:45/comments

Of course, we are doing this for url-friendliness, so we&#39;d like to make sure that none of these characters which will hold special meaning will be url-encoded by browsers, or any other system, and end up with a url like this:

    http://site/gwturl#user%3A45/comments &lt;--- BAD

Is using the colon in this way &lt;b&gt;safe&lt;/b&gt; (by which I mean won&#39;t be automatically encoded) for browsers, bookmarking systems, even Javascript or Java code?

Is a colon `:` safe for friendly-URL use?

How can I see in Java if an Object is an array without using reflection?
And how can I iterate through all items without using reflection?

I use Google GWT so I am not allowed to use reflection :(

I would love to implement the following methods without using refelection:

    private boolean isArray(final Object obj) {
      //??..
    }
    
    private String toString(final Object arrayObject) {
      //??..
    }

BTW: neither do I want to use JavaScript such that I can use it in non-GWT environments.

How to see if an object is an array without using reflection?

I am debugging a GWT application and I need to print some stuff to the console for testing purposes. `System.out.println` and `GWT.log` don&#39;t work. Does anyone have any ideas?

How to print to the console in GWT

I am trying to figure out if I should migrate my gwt-rpc calls to the new GWT2.1 RequestFactory cals.

Google documentation vaguely mentions that RequestFactory is a better client-server communication method for &quot;data-oriented services&quot;

What I can distill from the documentation is that there is a new Proxy class that simplifies the communication (you don&#39;t pass back and forth the actual entity but just the proxy, so it is lighter weight and easier to manage)

Is that the whole point or am I missing something else in the big picture?

When should I use RequestFactory vs GWT-RPC?

My questions is: Is there a good solution to use regular expression in GWT?

I&#39;m not satisfied with the use of String.split(regex) for example. GWT translates the Code to JS and then uses the regex as a JS regex. But I cannot use something like the Java Matcher or Java Pattern. But I would need these for group matching.

Is there any possibility or library?

I tried Jakarta Regexp, but I had other problems because GWT doesn&#39;t emulate all methods of the Java SDK this library uses. 

I want to be able to use something like this on the client side:

    // Compile and use regular expression
    Pattern pattern = Pattern.compile(patternStr);
    Matcher matcher = pattern.matcher(inputStr);
    boolean matchFound = matcher.find();
		    
    if (matchFound) {
        // Get all groups for this match
        for (int i=0; i&lt;=matcher.groupCount(); i++) {
            String groupStr = matcher.group(i);
            System.out.println(groupStr);
        }
    } 

Regular Expressions and GWT

I need to decide between jQuery and GWT for my new project.

I haven&#39;t programmed in JavaScript for a while, and I was looking into GWT for the last few days.  It looks pretty awesome, generating all the different JS for different browsers and all, however:

 - developing in Java takes more time than the same thing using jQuery (at least for this project)
 - the documentation is poor (for example, how should I know which elements should I use when designing the page? -- there&#39;s not enough documentation for this)

I&#39;ve been using jQuery for most of my projects and it&#39;s pretty good.

**I want to convince the client that jQuery is better suited for this project and I need more arguments to support this.**

Why should I use jQuery instead of GWT?

I want to vertically align the text in select box. I tried using 

    select{
       verticle-align:middle;
    }

however it does not work in any browsers. Chrome seems to align the text in select box to the center as a default. FF aligns it to the top and IE aligns it to the bottom. Is there any way to achieve this? I am using GWT&#39;s Select widget in UIBinder.

This is currently what I have:

    select{
    	height: 28px !important;
    	border: 1px solid #ABADB3;
    	margin: 0;
    	padding: 0;
        vertical-align: middle;
    }

Thanks!

I want to vertical-align text in select box

I would like my webpage&#39;s *viewport width* to equal *device-width* as long as *device-width* &gt; 450px, or 450px otherwise (my layout dynamically scales, but doesn&#39;t look good below 450px wide).

The following two meta tags work well on tablets, where the device-width &gt; 450px:

    &lt;!-- uses device width --&gt;
    &lt;meta name=&quot;viewport&quot; content=&quot;width=device-width&quot; /&gt;

    &lt;!-- use of initial-scale means width param is treated as min-width --&gt;
    &lt;meta name=&quot;viewport&quot; content=&quot;width=450, initial-scale=1.0&quot; /&gt;
		
however, on phones (where e.g. device-width=320px) the former is too thin for the content; and the latter causes the browser to zoom in, so the user has to manually zoom out to see the content.

Alternatively, this meta tag works well on phones

    &lt;meta name=&quot;viewport&quot; content=&quot;width=450&quot; /&gt;
	
but doesn&#39;t take advantage of the extra width available on tablets.

Any help/ideas would be really appreciated (and if it makes a difference, I&#39;m using GWT).

Achieving min-width with viewport meta tag

Hey I have a problem getting my head around how custom GWT event Handlers work. I have read quite a bit about the topic and it still is some what foggy. I have read threads here on Stackoverflow like this one https://stackoverflow.com/questions/998621/gwt-custom-event-handler. Could someone explain it in an applied mannar such as the following.

I have 2 classes a block and a man class. When the man collides with the block the man fires an event ( onCollision() ) and then the block class listens for that event.

Thanks


GWT Custom Events

I would like to understand the difference between the `Boolean` and `boolean` types in Java, specifically as they relate to GWT.
I know that methods are not supported but I want more info if it is available.

What&#39;s the difference between boolean and Boolean in Java?

I am trying to make a get request from the GWT servlet to get JSON response from a web service.
Following is the code in my servlet :

    public String getQueData() throws IllegalArgumentException {
        String message = null;
        try {		    
            HttpClient httpclient = new DefaultHttpClient(); 
            JSONParser parser = new JSONParser();
    
            String url = &quot;working - url&quot;;
            HttpResponse response = null;
            response = httpclient.execute(new HttpGet(url));
    
            JSONObject json_data = null;
            json_data = (JSONObject)parser.parse(EntityUtils.toString(response.getEntity()));
            JSONArray results = (JSONArray)json_data.get(&quot;result&quot;);
            for (Object queid : results) {
                message = message.concat((String) ((JSONObject)queid).get(&quot;id&quot;));
                message = message.concat(&quot;\t&quot;);
                message = message.concat((String) ((JSONObject)queid).get(&quot;owner&quot;));
                message = message.concat(&quot;\n&quot;);
            }
          } catch (Exception e) {
        message = e.toString();
        }
        return message;
    }

Getting the following exception on trying to make get request from a GWT servlet.

    java.lang.NoClassDefFoundError: org/apache/http/client/HttpClient
    	at java.lang.Class.getDeclaredConstructors0(Native Method)
    	at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
    	at java.lang.Class.getConstructor0(Class.java:2699)
    	at java.lang.Class.newInstance0(Class.java:326)
    	at java.lang.Class.newInstance(Class.java:308)
    	at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:153)
    	at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:428)
    	at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339)
    	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
    	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    	at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:35)
    	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    	at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:60)
    	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    	at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    	at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:122)
    	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    	at com.google.appengine.tools.development.BackendServersFilter.doFilter(BackendServersFilter.java:97)
    	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    	at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:78)
    	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    	at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:362)
    	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    	at org.mortbay.jetty.Server.handle(Server.java:326)
    	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    	at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
    	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
    	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
    	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
    	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
    Caused by: java.lang.ClassNotFoundException: org.apache.http.client.HttpClient
    	at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    	at java.security.AccessController.doPrivileged(Native Method)
    	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    	at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:176)
    	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)


What could be the possible cause of this exception?
How it could be removed?

I am using jdk1.6.0_30 on ubuntu 10.04.

java.lang.NoClassDefFoundError: org/apache/http/client/HttpClient

I just started learning [Google Web Toolkit][1] (GWT). How do I make different HTML pages in my GWT application?

For example, I want to create an application for a book store. In this application I&#39;ll have three pages: 

 1. Home pages where I will welcome the user and offer the user books 
 2. Page to browse books by categories and view details (use GWT widgets) 
 3. Check out books online.

Of course there could be other pages like the user&#39;s details, add new book, etc. 
So, what is the best way of making different pages in GWT and how can I make navigation from page to page? Are there any examples or tutorials? Or do I even need to create different pages when I can create a whole application in one page?

  [1]: http://en.wikipedia.org/wiki/Google_Web_Toolkit


Multiple pages tutorial in Google Web Toolkit (GWT)

I am looking for a _simple_ Json (de)serializer for Java that might work with GWT. I have googled a bit and found some solutions that either require annotate every member or define useless interfaces. Quite a boring. Why don&#39;t we have something really simple like

    class MyBean {
        ...
    }

    new GoodSerializer().makeString(new MyBean());
    new GoodSerializer().makeObject(&quot;{ ... }&quot;, MyBean.class)




Json &lt;-&gt; Java serialization that works with GWT

When running in compiled mode I get this dreaded GWT Module &#39;mymodule&#39; may need to be (re)compiled dialog message.

I&#39;ve compiled a list of the things that others have suggested to try when given this error message by GWT running in compiled mode.  I&#39;ve opened the WAR file created by maven and all the files are in the right place.  I confirmed this against another GWT maven project that does not get this error.  However, none of the below suggestions have corrected the problem.  Nor have I been able to identify what difference is missing between these two projects -- the one that works and mine that will not run in compiled mode.

 - [does name in html launch page match the module?](https://stackoverflow.com/questions/3688067/some-subtlety-of-gwt-compilation-gwt-module-may-need-to-be-recompiled)
 - Lots of lame suggestions to add the gwt.codesrv query string param onto the URL.  However, the point is to run without in compiled mode.  Obviously, I don&#39;t want to run in hosted mode.  That works.  I&#39;m trying to run in compiled mode in Tomcat.
 - Clearing browser cache? -- nope.  didn&#39;t help
 - I have **not** over-riden the &quot;user.agent&quot; property in mymodule.gwt.xml
 - [add to the maven-clean-plugin configuration your eclipse output directory: src/main/webapp/WEB-INF/classes](http://code.google.com/p/google-web-toolkit/issues/detail?id=4310)

What else can I try?

GWT module may need to be (re)compiled REDUX

I have a [GWT][1] application for which I&#39;m trying to write some tests using [Selenium][2].

I&#39;m using XPath to identify the elements on the page for the tests.  Using `id` won&#39;t work as the `id` values are auto-generated by GWT and can change.  Things started going well when I realised I could find buttons by their labels as follows:

    //button[.=&#39;OK&#39;]

However, when I started running multiple tests I started having problems.  I realised that the issue was all the different &quot;pages&quot; of the GWT app once generated by the Javascript remain in the HTML in hidden `&lt;div&gt;` elements.  This meant my Selenium tests were sometimes clicking hidden buttons instead of the button visible in the current view.

Examining the HTML with [Firebug][3], it seems that GWT hides the `&lt;div&gt;` elements by adding `display: none` to their `style` attribute.  This means I can find all the hidden OK buttons as follows:

    //div[contains(@style,&#39;display: none&#39;)]//button[.=&#39;OK&#39;]

This will find all the hidden OK buttons, i.e the buttons which have an ancestor `&lt;div&gt;` which is hidden by having `display: none` in the `style`.

My question is: how do I use XPath to find only the visible OK buttons?  How do I find the buttons which have no ancestor `&lt;div&gt;` elements with `display: none` in the `style`?


  [1]: http://code.google.com/webtoolkit/
  [2]: http://seleniumhq.org/
  [3]: http://getfirebug.com/

How do I select only visible elements using XPath?

What is the difference between `GWT.create(SomeClass.class)` and `new SomeClass()`?

Why would you use one over the other?

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