Call JSP with applet and wait till it is loaded

Hi,
I am calling a JSP with a java-script. The targetpage needs some time, until the applet is loaded. I would like to call a function in the applet.
My problem is, that I cannot set 'location.href' and straight after that call the applet, because it will not be there. How can I delay the applet-call, until it is really there?
function loadOrder(){
top.mainFrame.location.href = 'auftragseditor.jsp';
top.mainFrame.OrderApplet.setOrder( orderno )
I also fitted a while(...) loop between the two statements, but obviously the page is not build up in another thread. The loading will wait.
Thanks for your help
Klaus

Assuming that top.mainFrame.OrderApplet.setOrder( orderno ) causes an exception because
the applet is not loaded yet you should put it in a try and catch.
One other problem is that orderno is not defigned anywhere in your method.
function loadOrder(){
top.mainFrame.location.href = 'auftragseditor.jsp';
callApplet( orderno );
function callApplet(strPassToApplet){
try{
     top.mainFrame.OrderApplet.setOrder( orderno )
}catch(e){
    // try again in .1 seconds
    setTimeout("callApplet(\"" + strPassToApplet + \");",100);
}

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Applescript to launch an application and wait till it exits

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tell application "/Applications/Pages.app" to activate
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Trying to make this kind of thing work from the script editor is going to give you headaches. A better approach is to create a script application. Copy the following code into the Script Editor, and then save it as an application with the "Stay open after run handler" checkbox checked. Then run the resulting script application directly.
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Call a JSP from applet and display the results in the browser

Hello All,
I have written an applet which performs some functionality at the clinets browser. When the applets method finishes exectution, I would like to call
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regards,
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I hope this can help you
I made a package calls fun
and a clsss calls JspTestingFun
package fun;
public class JspTestingFun{
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<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="http://java.sun.com/jstl/sql" prefix="sql" %>
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<html>
<head>
<title>
jspTest
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<body bgcolor="#ffffff">
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Not able to run Applet after calling JSP with a Servlet

Dear Java-Community :)
At first I want to say, that my English isn't the best.. so I hope you'll understand my problem ;)
I'm running a J2EE-Application, packed in a EAR-File, on my JBoss with following directory-structur:
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/jaw6c/webapp/web/carList.jsp
/jaw6c/webapp/web/copy_darstellungErgebnisse.jsp
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/jaw6c/webapp/web/diagram.class<<<<<<<<<<<<<<<<<<<<<<<<
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/jaw6c/webapp/build.xml
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When I access "darstellungErgebnisse.jsp" DIRECTLY by entering a URL like "localhost:8080/jaw/darstellungErgebnisse.jsp" , the applet is loading perfectly !
But when my server is forwarding me to the JSP-Site with
RequestDispatcher dispatcher = getServletContext().getRequestDispatcher(destinationPage);
dispatcher.forward(request, response);
. . . . . . . ..I'll get a ""java.lang.ClassFormatError: Incompatible magic value 1008813135 in class file diagram
" -Error what means (referenced on the articles I've read here), that the diagram.class Is not found !
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So my question:
Why I'm able to access the JSP-File directly and seeing the applet but after forwarding to the JSP-File via the Servlet, I'm not able to see anything.
Would appreciate your help
Thank you and best regards
Edit:
1) I'm able to download the diag.jar and diagram.class file from different locations
2)I recognized, that after using the servlet, my url is changing from
localhost:8080/jaw
to
localhost:8080/jaw/controller
I tried added the class file to the position, where the controller-class file is, but without sucess.
3)Opening the class-file with a hex-editor shows me, that
the first bytes are
"CAFEBABE0000002E02B9070002010007"
(http://forum.java.sun.com/thread.jspa?threadID=648990&messageID=3820701)
Message was edited by:
Khaled01

Hello everybody,
I finaly have found the solution (after 16 hours).
Like I mentioned before, I recognized (maybe a little to late), that my path is changing when I'm using the servlet :
localhost:8080/jaw
to
localhost:8080/jaw/controller
(made by url-pattern in my web.xml).
So when my JSP tries to acces the class file, It's looking at:
localhost:8080/jaw/controller/applet/diagram.class
but the file is in:
localhost:8080/jaw/applet/diagram.class
So the solution is, to but a codebase-tag in my applet-declaration with following delcaration "basedir="../applet"
I hope I'll help somebody with the same problems. It took me a day to find out, that the solution was two points and a slash..... lol
Regards to everybody

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Hi,
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I can see emp2.jsp with correct parameters.
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See the onclick event.
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Looks like it should work, provided empcode and empname are both in the request parameters when you load this page.
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Onclick event jsp with Applet

If it is possible so give me Ans.
i am creating jsp page and display some data and link,
and i am clicking some link and open applet window with some result
it is possible or not .

possible
these might help:
http://www.java2s.com/Code/Java/JSP/JspAppletPlugin.htm
and this forum:
http://forums.sun.com/thread.jspa?threadID=224382&messageID=789775
Edited by: alwayslearn on Sep 16, 2008 6:08 AM

I need help with Applets and Multithreading

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now to the important matter: Applets and Threads
=======================================
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I have searched and searched all over and found no answers on this

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example (missing code)
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hi
im currently trying to write my first propear programming project, its a little evolving ecosystem but ive hit a stumbling block. im trying to write a method which returns an array of positions around a calling creatures location filled with numbers that refer to its surroundings, in the snippet below it places a 1 in reference to a prey. the method performs a pixel by pixel search of x y matches in an area around the calling creature, it then decides what location the reference is to be placed by working out which range of positions it is in.
unfortunately no one seems to recognise anybody or behave in the manner in which im encoding them to. i suspect its problem with my basic (and im sure crude) algorithm. if anyone has the time or indeed the inclination to look over this code and offer some opinion i would be very greatful indeed. or has anyone worked on a problem similar to this and could offer me some advice.
thanks
for(int index = 0; index < prey.size(); index++)
otherx = ((Prey)prey.get(index)).getXcord();
othery = ((Prey)prey.get(index)).getYcord();
for(int i = -8; i < 9; i++)
for(int j = -8; j < 9; j++)
if(otherx == xpos + i && othery == ypos + j && otherx != xpos
&& othery != ypos )
if(otherx <= xpos && otherx > (xpos - 8)
&& othery > (ypos + 3) && othery < (ypos + 8))
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&& othery >= ypos && othery < (ypos + 4))
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&& othery <= ypos && othery > (ypos - 8))
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&& othery <= ypos && othery > (ypos - 8))
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&& othery <= ypos && othery > (ypos - 8 ))
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&& othery > (ypos + 3) && othery < (ypos + 8))
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&& othery > (ypos + 3) && othery < (ypos + 8))
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I'm reposting the code with the formatting tags so that I can read it.
for(int index = 0; index < prey.size(); index++)
otherx = ((Prey)prey.get(index)).getXcord();
othery = ((Prey)prey.get(index)).getYcord();
for(int i = -8; i < 9; i++)
for(int j = -8; j < 9; j++)
if(otherx == xpos + i && othery == ypos + j && otherx != xpos && othery != ypos )
if(otherx <= xpos && otherx > (xpos - 8) && othery > (ypos + 3) && othery < (ypos + 8))
     objectsaround[zero] = 1;
else if(otherx <= xpos && otherx > (xpos - 8) && othery >= ypos && othery < (ypos + 4))
     objectsaround[one] = 1;
else if(otherx <= xpos && otherx > (xpos - 8) && othery <= ypos && othery > (ypos - 8))
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else if(otherx >= xpos && otherx < (xpos + 4) && othery <= ypos && othery > (ypos - 8))
     objectsaround[three] = 1;
else if(otherx > (xpos + 3) && otherx < (xpos + 8) && othery <= ypos && othery > (ypos - 8))
     objectsaround[four] = 1;
else if(otherx > (xpos + 3) && otherx < (xpos + 8) && othery >= ypos && othery < (ypos + 4))
     objectsaround[five] = 1;
else if(otherx > (xpos + 3) && otherx < (xpos + 8) && othery > (ypos + 3) && othery < (ypos + 8))
objectsaround[six] = 1;
else if(otherx >= xpos && otherx < (xpos + 4) && othery > (ypos + 3) && othery < (ypos + 8))
objectsaround[seven] = 1;

Probem with applet and servlets

subject "not able to invoke applet from servlets"
i have attached files also..
Respected sir,
I am thomas from prateek techologies ,referred by madam Pratibha.
Actually i have to plot point marks on a image(it is a Banglore map) in an applet(Uploadimg3.java).so, for doing so, iam getting values from database in my servlet file named Mapuser_sev.java
which is in the directory
WEB-INF/classes.
now after fetching the values ,i am not able invoke the Applet (Uploadimg3.java)which is in the directory
WEB-INF/classes/mapuser.
i have used the api ,response.sendredirect("/prakash/jspfiles/displaymap1.jsp");-->up to here it's ok..
I have used the plugin tag as follows:-
displaymap1.jsp
<html>
<body>
<jsp:plugin type="applet" code="Uploadimg3.class" codebase="WEB-INF/classes/mapuser" width="400" height="400">
</jsp:plugin>
</body>
</html>
if the plugin tag is wrong then please send me the correct coding for "jsp: plugin" with explaination.
this is my directory hierarchy..
jspfiles-->directory(folder)
Prakash/jspfiles/displaymap1.jsp ----->this file has the plugin tags as mentioned above..
Prakash is my context..
WEB-INF/
classes/Mapuser_serv.class -----> this is a servlet file
mapuser/
Uploadimg3.java -----> this is a Applet file
Uploadimg3.class
Mapuser1.java ---> i used this file to fetchdata from db ,please forget this file ..
Mapuser1.class
with regards,
Thomas..

It might be the restrictions java has about opening files in a web browser. I don' t know if it's allowed or not..

Concurrency with locks and wait/signal. Is it ok?

Hello,
I'm relatively new in concurrency. I've write this code that seems to work, but I'm not sure if there is any error (the concurrency concepts are not still clear for me).
In the following class "diskFile", I'll start 10 threads executing the class "diskCacheDataOneCall". The question is that the "populateCacheFromDisk" method should wait until 10 threads are finished and, if any thread produces an error, interrupt all threads and finish.
The code seems to work, but I have some questions like if I should synchronize the static variables Lock and Condition before using them.
Anyway, I'd like that an "expert" on concurrency tells me if this code is acceptable, or what kind of improvements can do (or, if there is some mistake, how to correct it).
I've spent many time reading tutorials about concurrency, and this is the result. Really, I'm not sure if I'm doing the things well, that's why I need the opinion of an expert in order to get better on concurrency.
Thanks in advance.
public class diskFile
// Static variables for threading.
public static Lock lock = null;
public static Condition cdFinished = null;
public static int numActiveThreads = 0;
public static Exception loadException = null;
// Main function
public static void populateCacheFromDisk() throws cacheServletException
ArrayList<Thread> arrThread = new ArrayList<Thread>();
// Init static variables.
lock      = new ReentrantLock();
cdFinished      = lock.newCondition();
numActiveThreads = 0;
loadException = null;
try
// Iterate 10 times (for simplicity) ...
for (int i = 0; i < 10; i++)
// Create THREAD and store its reference
Thread thr = new Thread(new diskCacheDataOneCall());
thr.start();
arrThread.add(thr);
// Increment "numActiveThreads"
lock.lock();
numActiveThreads++;
lock.unlock();
// Her we wait while no error happens and still active threads
lock.lock();
while ( (loadException == null) && (numActiveThreads > 0) )
cdFinished.await();
// If an error happens in any thread, then interrupt every active thread.
if (loadException != null)
for (int i = 0; i < arrThread.size(); i++)
Thread thr = arrThread.get(i);
if (thr.isAlive()) thr.interrupt();
throw loadException;
catch (Exception e) { throw new cacheServletException(); }
finally { lock.unlock(); }
public class diskCacheDataOneCall implements Runnable
public diskCacheDataOneCall() {}
public void run()
try
     diskFile.getCacheDataFromDiskOneCall(); // Load data from disk.
// Decrement "numActiveThreads"
     diskFile.lock.lock();
     diskFile.numActiveThreads--;
catch (Exception e)
diskFile.lock.lock();
diskFile.loadException = e;
finally
// Always signal and unlock.
diskFile.cdFinished.signal();
diskFile.lock.unlock();
}

Hello David,
Sorry but the code does not work. An IllegalMonitorStateException is throwed. Here I show you a simplified version (now with ThreadPoolExecutor):
   // Main class (it triggers "maxActive" threads)
   Lock lock = new ReentrantLock();
   Condition cdFinished = lock.newCondition();
   numActiveThreads = 0;
   loadException = null;
   try
    ExecutorService ex = Executors.newFixedThreadPool(numActiveThreads);
    for (int i = 0; i < numActiveThreads; i++) ex.execute(arrTasks.get(i));
    lock.lock();
    while ( (loadException == null) && (numActiveThreads > 0) )
               cdFinished.await();
    ex.shutdown();
   catch (Exception e) { throw e; }
   finally { lock.unlock(); }
// Every thread.
public void run()
   try
    doSomething();
    diskFile.lock.lock();
    diskFile.numActiveThreads--;
   catch (Exception e)
    diskFile.lock.lock();
    diskFile.loadException = cse;
   finally
    diskFile.cdFinished.signal();
    diskFile.lock.unlock();
}The exception is:
// Fail in the "signal" (finally section)
Exception in thread "pool-1-thread-1" java.lang.IllegalMonitorStateException
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.signal(AbstractQueuedSynchronizer.java:1666)
at com.vcfw.cache.cache.disk.diskCacheDataOneCall.run(diskCacheDataOneCall.java:44)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
at java.lang.Thread.run(Thread.java:595)
// Fail in the "unlock" (finally section)
Exception in thread "pool-1-thread-2" java.lang.IllegalMonitorStateException
at java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(ReentrantLock.java:125)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.release(AbstractQueuedSynchronizer.java:1102)
at java.util.concurrent.locks.ReentrantLock.unlock(ReentrantLock.java:431)
at com.vcfw.cache.cache.disk.diskCacheDataOneCall.run(diskCacheDataOneCall.java:43)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
at java.lang.Thread.run(Thread.java:595)
Some threads fail executing the signal, and some threads fail executing ythe unlock. An IllegalMonitorStateException seems to mean that the lock was not acquired by the thread, but I'm not able to see the mistake.
Can you help me?
Thanks.

Call JSP with applet and wait till it is loaded

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