Zheng Tech Blog

Performance is a broad topic which is never out of date. I'd like to itemize a checklist with specific topics, links and references. Some topic may be more generic and some may be more specific. But this list mainly focuses on WebCenter Portal applications and its relevant products. This is not intended to be a complete list and there will never be. WebCenter Performance Tuning Guide HA for WebCenter Portal and ADF application Configure JOC for WebCenter Portal services Configure Coherence Caching for Content Presenting WebCenter Performance Study (Including Enable Client Caching and Compression) Tuning JVM Weblogic Capacity Planning Middleware Performance Tuning Roadmap Oracle HTTP Server Performance Tuning MDS Performance Tuning Using Cluster and HA Features Some Useful A-Team Blog Posts: High availability considerations for WebCenter Portal and ADF   Improving ADF Page Rendering Time : Progressively Loading Taskflows Configure Coherence for Oracl...

My previous post described a scenario that the OAM DCC programmatic authentication is not supported yet, and here I am presenting a nice alternative to do the DCC authentication non-programmatically. You may have a read on Frank's book "Oracle Fusion Developer Guide" and there is a section in the ADF security talking about "Creating a login form in JSF" programmatically. This approach works for JEE contained security but would not work well with your WebCenter Portal or ADF app integrated with OAM authentication. I am introducing an approach that does not require any programmatic authentication and can be used safely with any type of authentications (contained security or OAM authentication). Note: You can create HTML form in JSF but there are many limitations, such as only one form component can be allowed in a page. Due to this, it's impossible to support a complicated login page in JSF. It induced extra pitfalls and challenges on the skinning as we...

In case of OAM authentication failures, the OAM server will send the error codes back to the client. It's up to the client to decide what actual error message needs to be displayed on different types of authentication failures. For the list of the standard error codes, you can refer to here . To getting the error code on the client side, they are different based on whether it's ECC or DCC authentication. I have not found this difference documented in anywhere yet. So I am putting it in this blog post. DCC (Detached Credential Collector) is introduced in OAM 11gR2. ECC is embedded credential collector. My previous post has described its concept and advantages, so I will not repeat it here. For ECC, the link above also shows a code snippet to get the error code parameter "p_error_code". The error code is returned back as one of the request parameters on the browser URL. So it can be accessed by calling request.getParameter("p_error_code"). <%@page i...

Credential Collection is the process of collecting the end user's credentials through a login page. When OAM Webgate intercepts a requests and detects the user is not authenticated yet, it would redirect the user to the login page. In OAM, when the login page is hosted on the OAM server, it's called Embedded Credential Collector (ECC). Another form - Detached Credential Collector (DCC) - is introduced in OAM 11gR2. As the name explains, DCC can be decoupled from the OAM server, which provides the flexibility of deploying the login page in either trusted internal network or DMZ. It uses a specific WebGate to collect he user credential and communicate to the OAM using secure Oracle Access Protocol (OAP). It offers a solution that isolates the OAM serve from any unauthenticated network connection, such as public access. It is my interest to discuss on whether DCC supports programmatic authentication. Usually the login page for OAM authentication would be form based JSP page w...

You might experience the FileNotFoundException (OracleJSP error:java.io.FileNotFoundException) error on rending your JEE app after a recent deployment on WebLogic server. You could also see errors in the log stating "unable to dispatch JSP page". First thing to try is, clear your browser's cache and request the page again. If this is not helping, then the issue is from the server side. When web application is activated and deployed, the new web application is exploded to a tmp directory under $DOMAIN_HOME, eg. $DOMAIN_HOME/servers/AdminServer/tmp/_WL_user... These directories are used in subsequent server starts so the applications do not have to be deployed again. In this case, some of the files and directories are missing in the tmp directory, resulting in errors observed. It is unknown what caused the files/directories to be missing in this case. To get rid of the error, simply need to either restart the manager server or force the re-deployment like below: ...