application | Techartifact

October 27, 2015November 10, 2016

Get context root or URL of ADF / Webcenter application

Hi,

I have requirement to get the context root in javascript on page load.Not on any event.If you need on java you can try my previous solution like get the current viewId or url in ADF using ControllerContext. Following solution will work in any application

Try this

window.location.protocol = “http:” // gives you protocol
window.location.host = “techartifact.com”
window.location.pathname = “blogs/2015/08/building-taskflow-for-reuse.html”

var pathArray = window.location.pathname.split(‘/’);
var secondLevelLocation = pathArray[1]; // this will give you the context root of application

Similarly you can get the current page number or param etc in javascript.

Similarly if you need this context root on some button event you can try like passing it using a af:clientAttribute and EL as *#{facesContext.externalContext.request.contextPath}*

<af:document id=”d1”>
<af:resource type="javascript">
        function onLoad(evt){
            var path=evt.getSource().getProperty("pagePath");
            window.location.replace(path);// here we were trying a redirect , just an example
        }
        </af:resource>
        <af:clientListener method="onLoad" type="load"/>
        <af:clientAttribute name="pagePath"
                            value="#{facesContext.externalContext.request.contextPath}/faces/<pagePath>"/>
….
</af:document>

Happy coding in techartifact

January 19, 2015February 13, 2016

Deploy ADF application as shared library in weblogic

Shared library – WebLogic Shared Library is an Enterprise Application Archive, a stand-alone EJB, a Web Application module, or a JAR file that is registered with Oracle WebLogic Server as a shared library. The library resources can be shared between multiple applications, alleviating the need to have duplicate copies of the resources in each application. For an example, we can all dependency as shared libraries in weblogic.

Normally in bigger application, best practice is to use common features application or dependency as shared library in weblogic. For example, taking an webcenter portal application
we are making custom taskflow and using it in webcenter portal application. We can deploy these adf taskflow as shared libraries and can reference in weblogic.xml for Portal application.

We have two option.
– Deploy adf app as jar and then deploy as shared library or wrap jar into war profile and deploy as shared library.
– We can directly deploy adf application as war shared lib in Weblogic.

Following is the process for ADF/ Webcenter Application in jdeveloper

1) Create deployment profile as war file.
2) Create an MANIFEST.MF file as META-INF/MANIFEST.MF

Manifest-Version: 1.0
Implementation-Title: ADF_Shared_Lib
Implementation-Version: 1.0
Specification-Title: ADF_Shared_Lib
Specification-Version: 1.0
Extension-Name: ADF_Shared_Lib

3) Edit war deployment profile and add MANIFEST.MF in war options.

4) Deploy ADF taskflow to weblogic(assuming you have made connection with weblogic in jdeveloper) to specific managed server or admin server.
5) mark option as deploy as shared library instead of application.

6) In master (Portal) application enter reference of your shared library as follows

ADF_Shared_Lib 1.0
1.0
true

This way you can directly deploy from the jdeveloper. Other options is to deploy as war file and find war file from specified location and go to weblogic admin console
and install as shared library

Note: If you deploying shared library again, make sure, you increase implementation version every time to specify version no.

Video –

Troubleshoot :

IOException: ‘Invalid header field; with manifest
Solution – Make sure name is name is correct. There is proper spacing after colon in manifest file content.

Unresolved WebApp library references defined in weblogic.xml
Solution- Make sure you have same implementation version and specification version of shared library, If there is mismatch you will get this error.

Till then happy deployment in Weblogic with Vinay…..

July 6, 2014July 6, 2014

Running Oracle ADF application on High availability (HA) architecture

Oracle ADF is used to build large enterprise application. And if you want to have your application to run on high availabilty then you should understand what is High Availability (HA) .

What is High Availability –
High availability refers to the ability of users to access a system without loss of service. Deploying a high availability system minimizes the time when the system is down, or unavailable and maximizes the time when it is running, or available. This section provides an overview of high availability from a problem-solution perspective. With HA , even for new deployment you will never have down time.

Normally in large enterprise application , you don’t want your system to be down..Application deployed in cluster environment. If one of the server down then the user session should replicate to another cluster . Now , we have Oracle HTTP Server (OHS) or Apache plugin is to used to get single URL and manage internally to replicate the session and send request if one of cluster is fail.

How a web server handle request

Cluster- Group of managed server running to provide scalability and reliability. In this multiple wls instance simultaneously and working together.Cluster is part of WLS domain . A domain can have multiple cluster

Architecture of Weblogic HA

Now the important point for developer – Few points designing and developing Oracle ADF application for HA.
There are 6 types of memory scopes. Read more on ADF memory scopes

When the Fusion web application runs in a clustered environment, a portion of the application’s state is serialized and copied to another server or a data store at the end of each request so that the state is available to other servers in the cluster.If it not serialized then user will lose data upon fail-over.

WebLogic duplicates those sessions by serializing the objects in the session and than transfers it to the secondary machine. Only the object that are stored in the session will be replicated. From an ADF perspective this means that managed bean with pageFlowScope and above will be replicated.It is very well defined in Oracle documentation and A-team article.

Configuring Oracle ADF development for High Availability

=> Changes in Application server-

While doing development Jdeveloper integrated server will not throw any errors by default. Add this parameter in server has to be run with the following JVM parameter:

-Dorg.apache.myfaces.trinidad.CHECK_STATE_SERIALIZATION=all

Note that this check is disabled by default to reduce runtime overhead. Do not use this after your testing is complete.

-> Changes in ADF code

-> Please make sure that managed beans used in ADF application with a scope greater than one request should be serializable ( implement the java.io.Serializable interface). Specifically, beans stored in session scope, page flow scope, and view scope need to be serializable.

– All pageflowscope and viewscope managed beans should not contain UI bindings. In essence, component bindings should live for a http request (request scope or backingBean scope). Any state or data you need for a longer duration can be saved in a pageflowscope bean separately.

– Make sure Oracle ADF is aware of changes to managed beans stored in ADF scopes (view scope and page flow scope) and enable the tracking of changes to ADF memory scopes.

use below code to notify ADF

controllerContext ctx = ControllerContext.getInstance();
ctx.markScopeDirty(viewScope);

-> Configuring Application Modules

– Right-click the application module and select Configurations.Click Edit.Click the Pooling and Scalability tab.
Select the Failover Transaction State Upon Managed Release checkbox.

<AppModuleConfig ...
 <AM-Pooling jbo.dofailover="true"/>
</AppModuleConfig>

-> Configuring weblogic.xml

In weblogic.xml file, add entry as below persistent-store-type definition to the session-descriptor element like below

<weblogic-web-app>
    <session-descriptor>
    <persistent-store-type>
    replicated_if_clustered
    </persistent-store-type>
    </session-descriptor>
</weblogic-web-app>

-> Configuring adf-config.xml

In adf-config.xml file, add entry as like below

<adf-controller-config xmlns="http://xmlns.oracle.com/adf/controller/config">
 <adf-scope-ha-support>true</adf-scope-ha-support>
</adf-controller-config>

Happy Learning with Vinay In techartifact.

Ref- http://docs.oracle.com/cd/E12839_01/core.1111/e10106/adf.htm