***URGENT*** What Server side objec should we develop and deplot to OAS?
Helo,
I use Jdev3.1 as my Java IDE.
I have to develop a server side java objects that will be deploy to OAS 4.0.8. My server side java objects will wait for client calls then perform certain business logics depending on each call? Please give me some advises about what type of java object should I develop.
From JDev help doc,I read about Application Module, EJB, Business Component, JSP..I am new to JDev and Java so I don't really undestand about the relationship between these copmponent, and what should be used since they seem to do the same thing. Please help, I have to submit a proposal next week. Thank you very much in advance.
Vivian
Yes, I'm parsing some XML data files. The full stack trace follows.
javax.xml.parsers.FactoryConfigurationError: Provider <HTML> could
not be instantiated: java.lang.SecurityException: class "<HTML>"'s
signer information does not match signer information of other classes
in the same package
at javax.xml.parsers.DocumentBuilderFactory.newInstance (DocumentBuilderFactory.java:99)
at XMLHandlerStrippedDown.<init>(XMLHandlerStrippedDown.java)
at onlinequestion.init(onlinequestion.java)
at sun.applet.AppletPanel.run(AppletPanel.java:353)
at java.lang.Thread.run(Thread.java:552)
javax.xml.parsers.FactoryConfigurationError: Provider <HTML> could
not be instantiated: java.lang.SecurityException: class "<HTML>"'s
signer information does not match signer information of other classes
in the same package
at javax.xml.parsers.DocumentBuilderFactory.newInstance (DocumentBuilderFactory.java:99)
at XMLHandlerStrippedDown.<init>(XMLHandlerStrippedDown.java)
at onlinequestion.init(onlinequestion.java)
at sun.applet.AppletPanel.run(AppletPanel.java:353)
at java.lang.Thread.run(Thread.java:552)
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Apple is more likely to see your comments if you send feedback via:
http://www.apple.com/feedback/itunesapp.html
=Downgrading from iTunes 11 to iTunes 10.7=
You may be able to go back with Time Machine but this may involve restoring other items too (https://discussions.apple.com/message/20441404). Alternatively:
Back up your computer first, in case the unexpected happens.
Quit iTunes.
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What is the difference between personnel development and performance management
Hi,
What is the difference between personnel development and performance management in terms of configuration and in portal level .
Thanks
SrikantHI Srikant,
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Hi, I am a uni student and have a final year java project to do.
The project must include:
1. a server side application that must run at specific times during the day (3 x a day) and store information to a database (MySQL).
2. a client side desktop application that will connect to the database and retrieve the information.
I have no problems writing the client side application. However, I am totally lost when it comes to knowing what server I need to have running the server side application and what type of java technology the server side application should use i.e EJB, entity beans etc??? How would the appliaction run at certain times, would I use a timer class? What would be the best way?
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1. ok if I develop my application as a "normal" java
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2. is developing the app as a normal java app
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We have a bunch of mp3 files on our server and we'd like to serve only particular sections of particular files to users. For example, hello.mp3 might be four minutes long, but when user 1 tries to play it, he should only be able to play the section from 0:30 to 1:00, whereas user 2 should be able to play the whole thing.
I'm coming from a background using Wowza Media Server, where this is fairly easy to achieve: http://fmsguru.com/showtutorial.cfm?tutorialID=78.
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I've been fiddling around with the main.asc file and the "Server-Side ActionScript" API to try and achieve something similar. In particular I've found the Stream.play method, which seems relevant. But I can't figure out how to attach a handler to a "play" event; all the examples I've seen only attach to Application.onConnect, which doesn't seem to include a connection to a particular file, which I need in order to determine the section that can be played.
So I'd like to do something along the lines of this (this is completely made up and doesn't follow any of the APIs; it's just an illustration of what I'm trying to achieve):
application.onConnect = function(client) {
client.onPlay = function(stream) { // Client.onPlay doesn't exist; what should I do here?
var section = getStreamSection(client, stream);
stream.play(section.start, section.end);
var getStreamSection = function(client, stream) {
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http://help.adobe.com/en_US/flashmediaserver/plugin_apiref/index.html
http://help.adobe.com/en_US/flashmediaserver/devguide/WS5b3ccc516d4fbf351e63e3d11a0d662434 -7ff6PluginAPI.html
Basically you need to concentrate on E_PLAY event and two fields F_STREAM_LENGTH & F_STREAM_POSITION. I am pasting below some code which you need to paste in your sample Auth Plug-in which you can find in : <installdir>/samples/plug-ins. You would have paste below code in case E_PLAY section in MyFmsAuthorizeEvent::authorize() function and compile it. You would basically get AuthModule.dll which you need to place in modules/auth and restart FMS.
// Set the Stream to be played back only for 10 seconds starting from 10 th second
// Stream will play from 10th Second to 20th Second
float fValue;
char buf[1024];
if (getFloatField(m_pAev, IFmsAuthEvent::F_STREAM_LENGTH, fValue))
float fLength = fValue; // in seconds
sprintf(buf,"Original Stream length value passed from player %f\n",fLength);
m_pFmsAuthServerContext->log(buf, IFmsServerContext::kInformation, false);
fLength=10.0;
sprintf(buf,"Modifying Stream length value passed from player %f\n",fLength);
m_pFmsAuthServerContext->log(buf, IFmsServerContext::kInformation, false);
setFloatField(m_pAev,IFmsAuthEvent::F_STREAM_LENGTH,fLength);
if (getFloatField(m_pAev, IFmsAuthEvent::F_STREAM_POSITION, fValue))
float iPosition = fValue; // in seconds
sprintf(buf,"Original Stream Position value passed from player %f\n",iPosition);
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iPosition=10.0;
sprintf(buf,"Modifying Stream length value passed from player %f\n",iPosition);
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I'd like to use the following post as a reference: http://72.5.124.102/thread.jspa?threadID=788137&messageID=4479784
"The DLL will remain loaded between calls, so if you use a global variable to store the connection then it should be ok. "
Of course this makes logical sense. However, JNI doesn't have a handle from my understanding... JNI looks like this:
private native void nativeMethodInvoke();
static {
System.load(path+dllName) // many alts to this, but yea.
// somewhere in main thread....
SelfClass varRefToSelf=new SelfClass();
// where SelfClass is the current class running.
// This doesn't make sense to me, considering usage of 'this' - so if anyone can explain that, I would greatly appreciate it.
varRefToSelf.nativeMethodInvoke();So.... am I supposed to keep a global reference within my class, to itself?!?
The actual problem is that I'm using a server-side language to invoke Java, and thus C++ via JNI. However, the server-side language is creating a new instance of the JAR upon each invocation. So my plan was to pass a reference to the module handle, and somehow manage to get that back to server-side language, and then furthermore back to Java JNI. Am thinking about moving to a servlet instead, since this doesn't appear to be possible - as unfortunate as that is.
Would SingleThreadModel work in this case? Or should I have C++ thread itself, so when Java makes a call, I can let C++ handle data by forwarding to correct module in memory? Assuming the above mentioned post is accurate, then the DLL, when loaded by Java, will stay in memory until unloaded. If the jvm is exiting after each server-side invocation, I must assume multiple instances of the dll are being created. So, am thinking this prospect will work... servlets aside...
Any help is appreciated. I clearly do not understand JNI as well as I should.
*Edit:
I have already tried this, and found that C++ DLL's thread is definitely active in memory post-jvm exit. The DLL also appears to be loaded multiple times, as the data I'm dealing with appears to be unique, in that it's not "stepping into itself" and overwriting pointers, or anything.
Am I going to have to create an instance of my class, via itself, to launch itself in the jvm manually - to keep the reference to dll in memory?
Although that statement sounds terribly redundant... I believe it's accurate...
1.) Create instance of class that's called by server-side, launch it under new jvm
2.) Have orig class return to server-side as normal, and forward any new requests to the jvm-launched "self"; based on detection of class/jvm in memory...
For being cross-platform "magical", Java sure makes it difficult to perform pretty basic tasks....Thanks for the great information jschell, this clears up alot. I'll play around with these new prospects and see if I can get this running properly.
Also, let me define more what I'm actually doing.
I'm using Railo, and a CFX "tag" to invoke a JAR. This Jar contains the JNI to execute a DLL's code. This dll's code is merely in place to perform some server tasks - mostly routine file maintenance, and checks to ensure normal operation. Some of this includes db queries. Yes this can be done in Java for the most part, but we plan to use the DLL exports later in a deployment scenario.
So, "Did you mean it is loading the jar each time?", I do believe so. However, the instances appear to be different. If i were to create a thread within the JNI invoking class, which i have tried by the way, and create a global variable with some value, the second calling of the JAR file reports that it has not been defined yet on class initialization. Additionally, the thread I mentioned also halts, and does not exist within the second calling.
Let me show some actual code...
Test.cfm...
<cfx_mytag Library="myLibrary.dll" task="function1">
<cfscript>
... // do some stuff.
</cfscript>If I were to alter that to:
<cfx_mytag Library="myLibrary.dll" task="function1">
<cfx_mytag Library="myLibrary.dll" task="function2">
<cfscript>
... // do some stuff.
</cfscript>I found that function2 in the same JAR, loaded via "cfx_mytag", reports inexistance of function1's execution - which registered a value into a global var.
This is why I must assume that the JAR is being loaded independantly - each time. Correct me if wrong. Perhaps my terminology is off - the class within the jar file is multi-instanced, as far as I can tell. Or rather... Railo is creating mutliple instances of this class - and thus I lose my handle to my dll - every call... Seemingly at least.
//Java...
import com.allaire.cfx.*;
public final class myClass implements CustomTag {
private Request req;
private Response res;
public boolean igetresetoften;
private native void gogoGadgetDLL();
public myClass() {
public void processRequest(Request request,Response response) throws Exception {
this.req=request;this.res=response;
if (!this.igetresetoften) {
igetresetoften=true;
res.write("yea... this is annoying");
// in actual code - function1() assigns global var.
// and function2() reports to response buffer the value of the global var , which is constantly false each run.
}Notice the similarity to a servlet (request/response buffers). I've dealt with servlets, so I know that all requests are threaded.. but the global vars in a servlet are, in fact, ... global. Not in this case, it would seem.
Thanks again, I'll let you know of my results, late tonight.
Edited by: jSD7 on Nov 13, 2009 4:20 PM -
What to keep in mind whilie developing under the new IOS PLA
Hi everyone.
I found out the the new IOS PLA was introduced on June 2nd. I could not spot any noticeable differences from the previous one.
The fellow developers at my office are quite acquaint with the previous PLA, however the release announcement sort of created confusion among them. They all wonder what to keep in mind while developing and publishing the apps under the new PLA.
Your help will be much appreciated!
Thanks in advanceVery simply "wired for internet" just means that you have, probably, Category 5 (CAT5) ethernet cables and jacks prewired in the home. These cables should all lead to one common location, hopefully in a patch panel or box. In order for this arrangement to be of any use you need a multi-port router and/or switch. I doubt whether the contractor provides this router/switch as part of the deal. Anyway the router/switch would connect all of these cables together as well as your internet service (DSL, Cable Modem, whatever). Plugging into any of the jacks in the home would connect you to the router/switch, which in turn would issue your device an IP address and connect you to the network. Internet access, as well as file sharing, would be controlled by the router/switch. Very basic home network and nothing complicated. Your Apple TV will work just fine with this network. You could also connect a network storage device, such as a large capacity hard drive that could be shared by all users on the network. Getting more complicated involves having a dedicated server machine running OS X Server for example.
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Server side database access with Applets?
Does anyone know how to do this without any JDBC or any other expensive, server heavy and special requirements?
Who could be interested in this?
Am i the only one?
Most internet hosts, rented i mean, do not give many possibilities you have PHP and not much more to access a MySql or other database engine.
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I use Supplehost for their reliable and inexpensive Java hosting service.
Many sites and applications make use of cross-browser DHTML and Java server technologies (JSP and servlets) are ideal for building and delivering data-driven DHTML pages.
Of course applets have their advantages but, without a server providing access to data in a database, they're effectively working just as a static web page.
There are other interfaces to databases: for example, Microsoft SQL Server provides the means to interrogate SQL databases through the underlying web server and to have the results returned in XML format.
For me, J2EE provides the best tools for developing data-driven applications and the question over which client should do the presenting is more often one of how best to cater for the intended audience: cross-browser DHTML is best in some circumstances, applets in others, Macromedia Flash in others.
Check out Supplehost's site: you get SSH and secure FTP access to a shared server, can install and run servlets and JSP applications and upload, configure and restart your applications very easily:
http://www.supplehost.com
Chris.
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