Ext Direct Java based implementation

**minneyar** · 28 Jul 2010 6:07 AM

Originally Posted by Sesshomurai

Hi again,
When submitting forms, I am only getting the Name field, not the Value field for a form element (combo).

Is this something going on in directjngine? I have all the form parameters set for each field and the form has the correct values in the fields, but when received on the server, they are the "name" values of the field, not the "value" value.

Any help appreciated.

Have you set the "valueField" config item on your combo box? That should tell your combo box which field in its store to use as the "value" when submitting data.

Anyway, I haven an unrelated problem I could use advice on...

I have a Java class that has its ActionScope set to Scope.SESSION. I want each user session to have its own set of member variables when interacting with this class, and I also want those variables to be cleaned up when the session ends, so that seems like a good way to do it.

I also want to have a button in the GUI that, when clicked, will prompt the user to download a text file. The way I usually do this kind of thing is to have an invisible iframe in the page and set the src of the iframe to the URL of the servlet that is providing the file, and in that servlet I set the Content-Type of the request appropriately and set the Content-Disposition to "attachment".

My problem is that the data I want the user to be able to download is stored in a member variable in the class whose scope is Scope.SESSION. How can I get that data to the iframe? Since all I can do to the iframe is set its URL, all I can do is make a plain HTTP GET request and pass parameters as arguments through the URL. I've tried manually crafting an Ext.Direct call to my DirectJNgine class, but DirectJNgine has some sort of NullPointerException when processing that. I've also thought about having a normal servlet respond to the request that uses "WebContextManager.get().getSessionScopedObject()" to look up that session's instance of my DirectJNgine class, but it seems like WebContextManager.get() always returns null when it's not called within a DirectJNgine call. I'm kind of at a loss here. Any other ideas?

**pagullo** · 8 Aug 2010 8:27 AM

Sorry to reply so late, but I've been on vacation :-)

DirectJNgine stores session scoped object in the HttpSession, and you can get them from there from anywhere in your Java code. To do that, you will need to write code similar to this:

Code:

HttpSession context = ...you will have to get the session on your own
String key = WebContext.getSessionScopedActionName(actionName);
Object result = context.getAttribute(key);
return result;

The only thing you need to know is the action name corresponding to the session scoped object -which you set yourself or is the default one assigned by DJN, the class name.

I think that you will be able to write the necessary plumbing to call that code starting from your iframe.

**kyrillos52** · 10 Aug 2010 12:29 AM

Hello, I'll try to use DirectJNgine but I've some problems. I'll read and do the exemples in the documentation and It's work quite well.

But there are something that I don't understand, I don't arrive to generate automatically the Api.js.

Here is my web.xml

Code:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>Efficacenergie-server</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
    <servlet-name>DjnServlet</servlet-name>
    <servlet-class>com.softwarementors.extjs.djn.servlet.DirectJNgineServlet</servlet-class>
    <init-param>
      <param-name>providersUrl</param-name>
      <param-value>djn/directprovider</param-value>
    </init-param>
    
    <init-param>
      <param-name>apis</param-name>
      <param-value>
        apiProjet
      </param-value>
    </init-param>
    
    <init-param>
      <param-name>apiProjet.apiFile</param-name>
      <param-value>js/Api.js</param-value>
    </init-param>

    <init-param>
      <param-name>apiProjet.apiNamespace</param-name>
      <param-value>Ext.app</param-value>
    </init-param>

    <init-param>
      <param-name>apiProjet.classes</param-name>
      <param-value>
      fr.efficacenergie.servlets.CPasserelle
      </param-value>
    </init-param>
      
    <init-param>
      <param-name>createSourceFiles</param-name>
      <param-value>true</param-value>
    </init-param>
    
      <load-on-startup>1</load-on-startup>
  </servlet>  
  
  <servlet-mapping>
    <servlet-name>DjnServlet</servlet-name>
    <url-pattern>/djn/directprovider/*</url-pattern>
  </servlet-mapping>
</web-app>

I use Eclipse Helios IDE.

Thanks for your help.

**pagullo** · 10 Aug 2010 10:23 AM

Originally Posted by kyrillos52

Hello, I'll try to use DirectJNgine but I've some problems. I'll read and do the exemples in the documentation and It's work quite well.

But there are something that I don't understand, I don't arrive to generate automatically the Api.js.

Thanks for your help.

Hi!

Just in case, check that the directory where you want to dump the api file exists.

If that does not solve the issue, set logging to very high (check the User's Guide for details), and post the full log you get when starting the webapp.

And, I think you must be getting some exception: check it and post it here, please.

**kyrillos52** · 10 Aug 2010 10:40 PM

Hi,

My problem is that Tomcat don't throw any exception. That's why I don't know where the problem is.

Code:

11 août 2010 08:34:43 org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre6\bin;.;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java/jre6/bin/client;C:/Program Files/Java/jre6/bin;C:/Program Files/Java/jre6/lib/i386;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\system32\WindowsPowerShell\v1.0;C:\Program Files\NTRU Cryptosystems\NTRU TCG Software Stack\bin\;C:\Program Files\Wave Systems Corp\Gemalto\Access Client\v5\;c:\Program Files\Fichiers communs\Roxio Shared\DLLShared\;c:\Program Files\Fichiers communs\Roxio Shared\10.0\DLLShared\;;C:\Program Files\NTP\bin
11 août 2010 08:34:43 org.apache.tomcat.util.digester.SetPropertiesRule begin
ATTENTION: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:Efficacenergie-server' did not find a matching property.
11 août 2010 08:34:43 org.apache.tomcat.util.digester.SetPropertiesRule begin
ATTENTION: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:Exemple-DirectJNgine' did not find a matching property.
11 août 2010 08:34:43 org.apache.coyote.http11.Http11Protocol init
INFO: Initialisation de Coyote HTTP/1.1 sur http-8080
11 août 2010 08:34:43 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 484 ms
11 août 2010 08:34:43 org.apache.catalina.core.StandardService start
INFO: Démarrage du service Catalina
11 août 2010 08:34:43 org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/6.0.29
log4j:WARN No appenders could be found for logger (com.softwarementors.extjs.djn.servlet.DirectJNgineServlet).
log4j:WARN Please initialize the log4j system properly.
11 août 2010 08:34:44 org.apache.coyote.http11.Http11Protocol start
INFO: Démarrage de Coyote HTTP/1.1 sur http-8080
11 août 2010 08:34:44 org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
11 août 2010 08:34:44 org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/32  config=null
11 août 2010 08:34:44 org.apache.catalina.startup.Catalina start
INFO: Server startup in 1031 ms

**alois.cochard** · 12 Aug 2010 4:15 AM

Greetings,

First of all I tried to send a comment on your blog, but I faced a blank page. Seems your blog engine don't work as expected

Then ... don't you think using the bugtracker/forum/mailling-list and other great features of Google code would be better than using a single thread in the Sencha forum ?

I understand that it was sufficient at the begin of your project, but your going to have more and more user, and this thread is already 34 pages long... not perfect to do some search and see if a problem was already resolved.

And finally, I just wanna know if some of you already experienced some socket connection failure with DirectJNgine, from time to time I'v got an exception:

Code:

Caused by: java.io.IOException: Stream closed
	at org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:406)
	at org.apache.catalina.connector.CoyoteReader.read(CoyoteReader.java:99)
	at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1128)
	at org.apache.commons.io.IOUtils.copy(IOUtils.java:1104)
	at org.apache.commons.io.IOUtils.toString(IOUtils.java:399)
	at com.softwarementors.extjs.djn.router.processor.standard.json.JsonRequestProcessor.process(JsonRequestProcessor.java:107)

I haven't investigated to see the root cause, it's perhaps on my side, but I wonder if someone else seen this exception...

Thanks

Alois Cochard
http://www.twitter.com/aloiscochard
http://aloiscochard.blogspot.com

**alois.cochard** · 12 Aug 2010 4:17 AM

You haven't configured log4j as this message say:

Code:

log4j:WARN No appenders could be found for logger (com.softwarementors.extjs.djn.servlet.DirectJNgineServlet).

You must configure the log system to see exactly what happen ....

Originally Posted by kyrillos52

Hi,

My problem is that Tomcat don't throw any exception. That's why I don't know where the problem is.

Code:

11 août 2010 08:34:43 org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre6\bin;.;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java/jre6/bin/client;C:/Program Files/Java/jre6/bin;C:/Program Files/Java/jre6/lib/i386;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\system32\WindowsPowerShell\v1.0;C:\Program Files\NTRU Cryptosystems\NTRU TCG Software Stack\bin\;C:\Program Files\Wave Systems Corp\Gemalto\Access Client\v5\;c:\Program Files\Fichiers communs\Roxio Shared\DLLShared\;c:\Program Files\Fichiers communs\Roxio Shared\10.0\DLLShared\;;C:\Program Files\NTP\bin
11 août 2010 08:34:43 org.apache.tomcat.util.digester.SetPropertiesRule begin
ATTENTION: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:Efficacenergie-server' did not find a matching property.
11 août 2010 08:34:43 org.apache.tomcat.util.digester.SetPropertiesRule begin
ATTENTION: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:Exemple-DirectJNgine' did not find a matching property.
11 août 2010 08:34:43 org.apache.coyote.http11.Http11Protocol init
INFO: Initialisation de Coyote HTTP/1.1 sur http-8080
11 août 2010 08:34:43 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 484 ms
11 août 2010 08:34:43 org.apache.catalina.core.StandardService start
INFO: Démarrage du service Catalina
11 août 2010 08:34:43 org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/6.0.29
log4j:WARN No appenders could be found for logger (com.softwarementors.extjs.djn.servlet.DirectJNgineServlet).
log4j:WARN Please initialize the log4j system properly.
11 août 2010 08:34:44 org.apache.coyote.http11.Http11Protocol start
INFO: Démarrage de Coyote HTTP/1.1 sur http-8080
11 août 2010 08:34:44 org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
11 août 2010 08:34:44 org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/32  config=null
11 août 2010 08:34:44 org.apache.catalina.startup.Catalina start
INFO: Server startup in 1031 ms

**pagullo** · 12 Aug 2010 11:16 AM

Will check what's going on with the blog, thanks!

Haven't seen this "Stream closed" problem and nobody else has reported it before.

Let us know your findings!

**alois.cochard** · 12 Aug 2010 11:22 PM

Thanks for the fast answer

After some investigation, that "Stream closed" problem is cleary not on your side ! Sorry

We haven't found the root cause yet, but it's cleary on our code

See you,

Alois Cochard
http://aloiscochard.blogspot.com
http://www.twitter.com/aloiscochard

Originally Posted by pagullo

Will check what's going on with the blog, thanks!

Haven't seen this "Stream closed" problem and nobody else has reported it before.

Let us know your findings!

**Toxa** · 13 Aug 2010 4:13 AM

Originally Posted by alois.cochard

Greetings,

First of all I tried to send a comment on your blog, but I faced a blank page. Seems your blog engine don't work as expected

Then ... don't you think using the bugtracker/forum/mailling-list and other great features of Google code would be better than using a single thread in the Sencha forum ?

I understand that it was sufficient at the begin of your project, but your going to have more and more user, and this thread is already 34 pages long... not perfect to do some search and see if a problem was already resolved.

And finally, I just wanna know if some of you already experienced some socket connection failure with DirectJNgine, from time to time I'v got an exception:

Code:

Caused by: java.io.IOException: Stream closed
	at org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:406)
	at org.apache.catalina.connector.CoyoteReader.read(CoyoteReader.java:99)
	at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1128)
	at org.apache.commons.io.IOUtils.copy(IOUtils.java:1104)
	at org.apache.commons.io.IOUtils.toString(IOUtils.java:399)
	at com.softwarementors.extjs.djn.router.processor.standard.json.JsonRequestProcessor.process(JsonRequestProcessor.java:107)

I haven't investigated to see the root cause, it's perhaps on my side, but I wonder if someone else seen this exception...

Thanks

Alois Cochard
http://www.twitter.com/aloiscochard
http://aloiscochard.blogspot.com

What application server you use? We have the same issues under Jboss 5.

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Ext Direct Java based implementation

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