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Category Articles
Why doesn't my browser applet connect to the database?
Added on Thu, Dec 24, 2009
Problem: I'm using a WebLogic multitier driver in an applet as an interface to a DBMS. If I run the class using the Sun Appletviewer on my local machine, I have no problems. But when I try to run the applet in a Netscape browser, it will not... Read More
How many Web Logic Servers can I have on a multi-CPU machine
Added on Thu, Dec 24, 2009
There are many possible configurations and each has its own advantages and disadvantages. BEA WebLogic Server has no built-in limit for the number of server instances that can reside in a cluster. Large, multi-processor servers such as Sun... Read More
What are the Applet?s Life Cycle methods? Explain them? - Following are methods in the life cycle of an Applet
Added on Thu, Dec 24, 2009
* init() method - called when an applet is first loaded. This method is called only once in the entire cycle of an applet. This method usually intialize the variables to be used in the applet. * start( ) method - called each time an applet is... Read More
Why does my applet work with Appletviewer, but not with a browser?
Added on Thu, Dec 24, 2009
I tried to run two of the applets in the examples directory of the distribution. I installed the WebLogic classes on my local machine (NT server) and on another machine (a Windows 95 client). I am not using any browsers, just trying to run the... Read More
What are the alternatives to using applets?
Added on Thu, Dec 24, 2009
BEA supports the use of server-side applications with HTTP servlets and Java Server Pages (JSPs) as part of the J2EE platform. We recommend that before you develop new applications, consider using either servlets or JSPs. A well-designed series of... Read More
What is an applet?
Added on Thu, Dec 24, 2009
An applet is a small Internet-based program written in Java, a programming language for the Web, which can be downloaded by any computer. The applet is also able to run in HTML. The applet is usually embedded in an HTML page on a Web site and can... Read More
What is the life cycle of an applet?
Added on Thu, Dec 24, 2009
init( ) method - called when an applet is first loaded start( ) method - called each time an applet is started paint( ) method - called when the applet is minimized or maximized stop( ) method - called when the browser moves off the applet's... Read More
What are the Applet?s information methods?
Added on Thu, Dec 24, 2009
The following are the Applet?s information methods: getAppletInfo() method: Returns a string describing the applet, its author, copyright information, etc. getParameterInfo( ) method: Returns an array of string describing the applet?s parameters. Read More
How do clients learn about new WebLogic Server instances?
Added on Thu, Dec 24, 2009
Once a client has done a JNDI lookup and begins using an object reference, it finds out about new server instances only after the cluster-aware stub has updated its list of available servers. Read More
What is an Applet? Should applets have constructors?
Added on Thu, Dec 24, 2009
Applets are small programs transferred through Internet, automatically installed and run as part of web-browser. Applets implements functionality of a client. Applet is a dynamic and interactive program that runs inside a Web page displayed by a Java... Read More
How are notifications made when a server is added to a cluster?
Added on Thu, Dec 24, 2009
The Web Logic Server cluster broadcasts the availability of a new server instance each time a new instance joins the cluster. Cluster-aware stubs also periodically update their list of available server instances. Read More
Can I use a "native" two-tier driver for a browser applet?
Added on Thu, Dec 24, 2009
No. Within an unsigned applet, you cannot load native libraries over the wire, access the local file system, or connect to any host except the host from which you loaded the applet. The applet security manager enforces these restrictions on applets... Read More
How do stubs work in a Web Logic Server cluster?
Added on Thu, Dec 24, 2009
Clients that connect to a WebLogic Server cluster and look up a clustered object obtain a replica-aware stub for the object. This stub contains the list of available server instances that host implementations of the object. The stub also contains the... Read More
What happens when a failure occurs and the stub cannot connect to a Web Logic Server instance?
Added on Thu, Dec 24, 2009
When the failure occurs, the stub removes the failed server instance from its list. If there are no servers left in its list, the stubb uses DNS again to find a running server and obtain a current list of running instances. Also, the stub... Read More
How does a server know when another server is unavailable?
Added on Thu, Dec 24, 2009
Web Logic Server uses two mechanisms to determine if a given server instance is unavailable. Each Web Logic Server instance in a cluster uses multicast to broadcast regular "heartbeat" messages that advertise its availability. By monitoring... Read More
How do clients handle DNS requests to failed servers?
Added on Thu, Dec 24, 2009
If a server fails and DNS continues to send requests to the unavailable machine, this can waste bandwidth. For a Java client application, this problem occurs only during startup. WebLogic Server caches the DNS entries and removes the unavailable... Read More
What's causing ClassFormatErrors with my applet?
Added on Thu, Dec 24, 2009
Problem: I downloaded your distribution and copied the classes to my HTTP server DocumentRoot. I created an applet that I ran successfully from my Netscape server. I placed it in the server directory /webz/ns-home/classes/applets/myapp.class and... Read More
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