ADFC-00024-oracle.adf.controller.ControllerException:: No ExternalContext could be found.

 ADFC-00024- No ExternalContext could be found.
this is the exception, i have faced while working on my new ADF application and due to this exception application crashed(Internal Server Error-500)
After lot of googling and searching on OTN, i found a solution for this exception- but really don't understand that how it works-
log of ADFC-00024 problem-

 oracle.adf.controller.ControllerException: ADFC-00024: No ExternalContext could be found.  
      at oracle.adfinternal.controller.util.JsfInterfaceImpl.getExternalContext(JsfInterfaceImpl.java:394)  
      at oracle.adfinternal.controller.util.JsfInterfaceImpl.getRequestMap(JsfInterfaceImpl.java:143)  
      at oracle.adfinternal.controller.state.AdfcContext.getCurrentInstance(AdfcContext.java:219)  
      at oracle.adfinternal.controller.ControllerContextImpl.getViewPortByClientId(ControllerContextImpl.java:121)  
      at oracle.adf.controller.internal.binding.DCTaskFlowBinding.getGuardingPermission(DCTaskFlowBinding.java:204)  
      at oracle.adf.model.binding.DCBindingContainer.getGuardingPermission(DCBindingContainer.java:3849)  
      at oracle.adf.model.binding.DCBindingContainer.internalIsViewable(DCBindingContainer.java:3855)  
      at oracle.adf.model.binding.DCBindingContainer.isViewable(DCBindingContainer.java:3826)  
      at oracle.adf.model.binding.DCBindingContainer.resetSuspendedExecutables(DCBindingContainer.java:3490)  
      at oracle.adf.model.binding.DCBindingContainer.resetSuspendedExecutables(DCBindingContainer.java:3492)  
      at oracle.adf.model.binding.DCBindingContainer.internalRefreshControl(DCBindingContainer.java:3365)  
      at oracle.adf.model.binding.DCBindingContainer.refresh(DCBindingContainer.java:2911)  
      at oracle.adf.controller.v2.lifecycle.PageLifecycleImpl.prepareModel(PageLifecycleImpl.java:115)  
      at oracle.adf.controller.v2.lifecycle.Lifecycle$2.execute(Lifecycle.java:149)  
      at oracle.adfinternal.controller.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:197)  
      at oracle.adfinternal.controller.faces.lifecycle.ADFPhaseListener.access$400(ADFPhaseListener.java:23)  
      at oracle.adfinternal.controller.faces.lifecycle.ADFPhaseListener$PhaseInvokerImpl.startPageLifecycle(ADFPhaseListener.java:238)  
      at oracle.adfinternal.controller.faces.lifecycle.ADFPhaseListener$1.after(ADFPhaseListener.java:274)  
      at oracle.adfinternal.controller.faces.lifecycle.ADFPhaseListener.afterPhase(ADFPhaseListener.java:75)  
      at oracle.adfinternal.controller.faces.lifecycle.ADFLifecyclePhaseListener.afterPhase(ADFLifecyclePhaseListener.java:53)  
      at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:439)  
      at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:204)  
      at javax.faces.webapp.FacesServlet.service(FacesServlet.java:312)  
      at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)  
      at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)  
      at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)  
      at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)  
      at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)  
      at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:173)  
      at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)  
      at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:122)  
      at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:468)  
      at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)  
      at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:468)  
      at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:293)  
      at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:199)  
      at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)  
      at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)  
      at oracle.adf.library.webapp.LibraryFilter.doFilter(LibraryFilter.java:180)  
      at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)  
      at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:111)  
      at java.security.AccessController.doPrivileged(Native Method)  
      at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)  
      at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:413)  
      at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:94)  
      at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:161)  
      at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)  
      at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)  
      at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:136)  
      at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)  
      at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)  
      at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)  
      at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)  
      at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)  
      at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)  
      at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)  
      at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)  
      at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)  
      at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)  
      at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)  
      at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)  

In my case this was due to Application Module configuration, in adf application we have two configuration .

1. AMLocal
2. AMShared

For local configuration ,in Pooling and Scalability there is Maximum Pool Size is 4096 but for shared it is only 1
i am not getting why this is so, then i have set Maximum Pool Size for shared configuration to 4096 and it is working-

Currency Conversion - Google Calculator API integration in ADF using GSON

First ,thanks to this post http://blog.caplin.com/2011/01/06/simple-currency-conversion-using-google-calculator-and-java/ .
I was looking for any API, webservice for retrieving live currency fluctuation, finally i came to this solution that integrates Google Calculator with Java to calculate currenct currency rates and i have integrated this with my Oracle ADF Application

I have created an application using bounded taskflow -

• Created a .jsff page with two input text , to get value of Base and Term currency and a button, on which rate is calculated

 

•  In order to use Goolge Calculator, we have to use GSON (open source java library (API) to convert JSON objects in POJO (pure java object)) 
• To access GSON library we have to add google-gson-stream-2.2.1.jar in our project library - Download Gson Jar
• this trick uses google calculator for calculating converion rate, as we all know Google Calculator is very smart, whenever we search like 1 USD ,it always shows results according to locale

As 1 USD searched in India-

As 1 USD searched in UK- 

• this is also hidden benefit for our application , we can pass locale to get changed values also- now see what is the code that get values from Google Calculator



   public void calculateFluctuationButton(ActionEvent actionEvent) throws Exception {  
     String google = "http://www.google.com/ig/calculator?en=hi&q=";  
     /**Get values from page component binding*/  
     String baseCurrency = baseCurrencyBind.getValue().toString();  
     String termCurrency = termCurrencyBind.getValue().toString();  
     String charset = "UTF-8";  
     /**Replace url using your values-*/  
     URL url = new URL(google + baseCurrency + "%3D%3F" + termCurrency);  
     /**Go to url directly to see you result*/  
     System.out.println(url);  
     Reader reader = new InputStreamReader(url.openStream(), charset);  
     Result result = new Gson().fromJson(reader, Result.class);  
     System.out.println(result);  
     // Get the value without the term currency.  
     String amount = result.getRhs().split("\\s+")[0];  
     System.out.println(amount);  
     resultBind.setValue(amount);  
   }  



• See in code i have passed currency notation from page (INR,USD ) to bean and passed it in url of google calculator and this url returns results

Download Complete Application -Sample ADF Application

Gmail Integration with Oracle ADF using Java Mail API

Gmail is a free secure webmail provided by google, can be accessed by using POP3 or IMAP4 protocol
we have option to integrate Gmail with Java using Java Mail API and I have tried same in Oracle
ADF.
I have developed an application that can send mail (with Attachements) using Gmail in Oracle ADF,
using bounded TaskFlow.

• First , in bounded taskflow ,a login page is created, and a page to send mail is created
• Now you can get values from page and use in bean- So I am not going to write these things
• Integration points starts when you get mail server properties- Managed Bean Code
• You have to use 2 JAR ,inorder to use Java Mail API

  1.mail.jar 2. Activation.jar- Download

Properties emailProperties;

public void setMailServerProperties() {
String emailPort = "587"; //gmail's smtp port
emailProperties = System.getProperties();
emailProperties.put("mail.smtp.port", emailPort);
emailProperties.put("mail.smtp.auth", "true");
emailProperties.put("mail.smtp.starttls.enable", "true");

}

• Now you have to create your message (With or Without attachments)--
   


public void createEmailMessageWidtAtchmnt() throws AddressException, MessagingException {
toWhom = toBind.getValue().toString();
subject = subjectBind.getValue().toString();
messagae = messageBind.getValue().toString();
String[] toEmails = { toWhom };

String emailSubject = subject;
String emailBody = messagae;

mailSession = Session.getDefaultInstance(emailProperties, null);
emailMessage = new MimeMessage(mailSession);

for (int i = 0; i < toEmails.length; i++) {
emailMessage.addRecipient(Message.RecipientType.TO, new InternetAddress(toEmails[i]));
}

emailMessage.setSubject(emailSubject);

//1) create MimeBodyPart object and set your message content
BodyPart messageBodyPart1 = new MimeBodyPart();
messageBodyPart1.setText(emailBody);

emailMessage.setContent(emailBody, "text/html"); //for a html email


}

• here I am getting values from page component binding so don't get confused by this- toBind
  subjectBind, messageBind are component binding of page
  
  
  
  
  
  
• Code snippet to create mail with attachements, you have to do little change in createEmailMessageWidtAtchmnt() to add files in mail . This code browse files from D drive
  
  of system .


//1) create MimeBodyPart object and set your message content
BodyPart messageBodyPart1 = new MimeBodyPart();
messageBodyPart1.setText(emailBody);

//2) create new MimeBodyPart object and set DataHandler object to this object
MimeBodyPart messageBodyPart2 = new MimeBodyPart();

String filename = "D://" + file_name; //change accordingly
System.out.println("Exact path--->" + filename);
DataSource source = new FileDataSource(filename);
messageBodyPart2.setDataHandler(new DataHandler(source));
messageBodyPart2.setFileName(filename);


//5) create Multipart object and add MimeBodyPart objects to this object
Multipart multipart = new MimeMultipart();
multipart.addBodyPart(messageBodyPart1);
multipart.addBodyPart(messageBodyPart2);

//6) set the multiplart object to the message object
emailMessage.setContent(multipart);

• To add files in mail in ADF you have to use af:inputFile component, and create a ValueChangeListener on component that get fileName when you browse any file from D drive of your system .
  
  
private String file_name;

public void uploadedFileAttachmentVCE(ValueChangeEvent valueChangeEvent) {
UploadedFile file = (UploadedFile)valueChangeEvent.getNewValue();
file_name = file.getFilename();
}

• From login page you will get login emailId and password, that is set in managed bean code to authenticate user- and send mail


public void sendEmail() {

String emailHost = "smtp.gmail.com";
String fromUser = emailId; //just the id alone without @gmail.com
String fromUserEmailPassword = pwd;
Transport transport = null;
try {
transport = mailSession.getTransport("smtp");
} catch (NoSuchProviderException e) {
System.out.println("No such Provider Exception");
}
try {
transport.connect(emailHost, fromUser, fromUserEmailPassword);
transport.sendMessage(emailMessage, emailMessage.getAllRecipients());
transport.close();
StringBuilder msgEmail = new StringBuilder("Email Sent");
FacesMessage msg = new FacesMessage(msgEmail.toString());
msg.setSeverity(FacesMessage.SEVERITY_INFO);
FacesContext.getCurrentInstance().addMessage("No Network Error !", msg);
System.out.println("Email sent successfully.");
} catch (MessagingException e) {
System.out.println("somthing went wrong-->Messaging Exception");

}

}

Download Complete Application and map these code to bean-Download Sample ADF Application