ADF, Java and everything

A while ago, I built an MAF application, which was consuming a few REST webservices from Oracle Java Cloud. But for each request from the app, the response JSON was getting created, and which made the app response very slow.  So, I created the contents of the REST response as a scheduled job. My data wasn't getting changed that often, so I choose to build my REST responses every morning at 10am using java.util.TimerTask. Used Software: JDeveloper 12.1.3 #1. REST response POJOs : public class Feed {         public String url;     public String source;         public Feed() {         super();     }         public Feed(String source, String url) {         setSource(source);         setUrl(url);     }         public void setSource(String source) {         this.source = source;     }     public String getSource() {         return source;     }     public void setUrl(String url) {         this.url = url;     }     public String getUrl() {         return url;     } } ============

Recently I had to implement a SOAP webservice call from a af:commandButton action, but the requirement was to make it an asynchronous call. So that the user doesn't have to wait till the Webservice finish processing the request. So I built : Interface which extends java.util.concurrent.Callable. Interface so that I can use the same technique to call multiple Webservices, if required. A session scoped bean to invoke the above interface. #1. Interface : WebserviceCallee public interface WebserviceCallee<T> extends Callable<Boolean> {          // Base URL of the Webservice to call     public String getBaseUrl();     public void setBaseUrl(String baseUrl);     // To identify this object uniquely         public String getUniqueIdentifier(); } #2. Implentation :   public class WebServiceA implements WebserviceCallee<Boolean> {         private static Log log = LogFactory.getLog( WebServiceA .class);         private String baseUrl;     private Thread

I have recently faced quite a lot of problem using JAXB objects to invoke SOAP webservices. There were several elements declared as : <xs:simpleType name="someAttr"><xs:restriction base="xs:double"/></xs:simpleType> When I used "wsimport" command line tool to generate Java classes for the WSDL, all those attributes generated as private double someAttr; What happened later was all the values were transformed automatically to scientific notation like : 2.85292746E8 This was a major issue, as the actual values were getting truncated.  After a long search and trial and error, I found an easy solution to my problem, to change the declaration  private double someAttr; To : private BigDecimal someAttr; No value truncation or transformation happened after that.  

Prerequisites of this implementation : ViewObject (in the example it is "MyViewObject") Some utility is used in the example, check my other blogs "ADF  Utility" #1. Create LOV Listener class This class will open the LOV window in a popup and also when user selects a row and click OK in the popup, it will set the value property of the input Text ui component where this LOV is invoked from. // Add the getters and setters of all the class level attributes. // I have removed them from this example to shorten the length of the blog. // For "getUIComponent()" check my other blog to find a UI Component from managed bean public class MyLOVListener {         /**      * ID of the popup where af:table is defined      */     private String popupId;     /**      * ID of the inputText component where the selected value      * from the popup should be copied back      */     private String inputTextId;     /**      * Name of the iterator defined the in paged

Many a times it is required to retrieve the ApplicationModule object from ADF managed beans, for example, to programmatically query a view object.  Invoke the below class like : AppModuleBean.getService(FacesContext.getCurrentInstance(), APP_MODULE_NAME)) This gives 3 different ways to retrieve the AppModule. Using BindingContext. Evaluating DataControl EL expression. Evaluating Bindings EL expression.     public class AppModuleBean {     public static ApplicationModule getService(FacesContext fc, String name) {                 DCDataControl dc = fromBindingContext(name);                 if(dc == null) {                        dc = fromEvaluatingDataControlEL(fc, name);         }                 if(dc == null) {             dc = fromEvaluatingBindingsEL(fc, name);         }                 return (ApplicationModule) dc.getDataProvider();     }         private static DCDataControl fromBindingContext(String name) {                 DCDataControl dc = null;         BindingConte

Many a times, it is required to find an UIComponent from ADF managed bean, to do something with it, for example : change the value of an af:outputText, change readOnly property of an af:inputText etc.     private UIComponent getUIComponent(String id) {                  FacesContext facesCtx = FacesContext.getCurrentInstance();          return findComponent(facesCtx.getViewRoot(), id);     }          private UIComponent findComponent(UIComponent base, String id) {                 if (id.equals(base.getId())) {             return base;         }         UIComponent children = null;         UIComponent result = null;         Iterator childrens = base.getFacetsAndChildren();         while (childrens.hasNext() && (result == null)) {             children = (UIComponent)childrens.next();             if (id.equals(children.getId())) {                 result = children;                 break;             }             result = findComponent(children, id);             if (result != nu

To evaluate an EL expression from ADF managed classes, such as managed beans.   public Object getExpressionValue(String jsfExpression)   {     // when specifying EL expression in managed bean as "literal" value     // so t can be evaluated later, the # is replaced with $, quite strange     if (jsfExpression == null)     {       return jsfExpression;     }     if (jsfExpression.startsWith("${"))     {       jsfExpression = "#{" + jsfExpression.substring(2);     }     if (!jsfExpression.startsWith("#{"))     {       if (jsfExpression.equalsIgnoreCase("true"))       {         return Boolean.TRUE;       }       else if (jsfExpression.equalsIgnoreCase("false"))       {         return Boolean.FALSE;       }       // there can be literal text preceding the expression...       else if (jsfExpression.indexOf("#{")<0)       {         return jsfExpression;       }     }     ValueExpression ve =  getApplication().getExpres

This blog will give you an overview on how you can successfully deal with unhandled Runtime exceptions in an ADF application. This will give you an idea of: How to catch the unhandled exceptions. Write a separate log file with stacktrace and thread dumps. Redirect the user to an static error page #1. Catch unhandled exceptions :  Create a class "MyExceptionHandler" which extends : oracle.adf.view.rich.context.ExceptionHandler. Override handleException() method.     public void handleException(FacesContext facesContext, Throwable throwable, PhaseId phaseId) throws Throwable {         // this method is going to create a separate file with stacktrace and thread dumps         writeException(throwable);         // redirect to error page         redirectToErrorPage(facesContext);     }  Create a folder "services" inside : ViewController\src\META-INF and then create a file named "oracle.adf.view.rich.context.ExceptionHandler". In the file, add