Applet+servlet+good practice

Hi there,
I'd like to know what is of "good taste" when it comes to transfer data between servlet and applet : using vector to carry the data or by some way transfer the resultset itself ?
Or better : some sort of xml that would allow the end user to work disconnected from the servlet, do its changes when traveling (hope it's not by plane these times...) and then back to the office by some usual conciliation mechanism update the database ....?
Currently i'm using the firs method, but, not sure it's the best way
Any good practical (already improved) idea ?
thanks and welcome to all

I think the better way is to transfer XML data, because this way you are free to implement a client in a different language, not only java. XML is a standard for the interexchange of data between different platforms and different languages. I think it's the best option. But it has disadvantages too. You transfer more data than strictly necessary by the web and transfer times are higher, so if you are looking for efficiency, you should think in propietary formats of information (compressed...).
I hope this helps you, and sorry about my English.

Similar Messages

Is there a good advanced review on applet-servlet communication

I am working on a web application and unfortunately experiencing a lot of trouble trying to use an applet as front end which interacts with a couple of servlets running on Tomcat. I need to get data from one servlet and send data to another.
There is a lot of messages posted in this and other forums about how to do this, but none of them got a response pointing to a useful advanced reference on this subject. I have reviewed some of the references given, but couldn't find a thorough detailed advanced reference on applet-servlet communication. For this I mean an exhaustive explanation of the mechanism of communication and when and when is neccesary to use each of the multiple configuration possibilities regarding content-type, message-length, request-method, connection settings, and so on.
Would anybody be so kind to show me the right direction? As I read the (literally) hundreds of messages posted on this topic, I see this info as widely useful. Most of the topic tracks ends on void or with painful no-way sentences, and maybe many people is avoiding Java technology on web application because of this problem (development delays can abort a project).

This sample chapter in Java developers' guide to Servlets and Jsp focuses on Applet-Servlet communication, is a pretty good one, and is free :
http://www.javaranch.com/bunkhouse/samps/2809ch12.pdf
As to an exhaustive & complete guide that covers absolutely everything, I may be wrong but I doubt you'll find anything like that...unless there is a book somewhere dedicated to the subject.

Good practices with GUI? (deriving classes)

Hello!
I wonder if it is good practice to have the GUI in the
init()-class, or superclass in an Applet? I have an applet with the GUI in the init(), and all events in the GUI is passed to it's child-class, named Manager. What about listeners, should they be in a class of their own?
I am missing these guidelines in the tutorial, they don't tend to stress it, even though I think it is important for us newbies.

hi,
most times it is not really good to have listeners in own classes, because the job of many listeners is to invoke special algorithms which are mostly implemented in the class of the component, that owns the event. If you implement the listener in an own class, these class have to know the class, which hold the component an so you get an overhead of instances, you not really need.
Another point you have to see is the object-oriented view on things:
You only implement own classes, if they have a special use and can be used for more than one object, but most listeners doesn't fullfill this purpose, they are just needed for a special object and cannot be used for an other than this one.
regards

Applet+servlet+standards

Hi there,
I am relatively new at java and i was asking myself one question :
let's say i have an applet that "post" to a servlet to validate login and password against a database (so far it works well), what is the mean by wich (if the login password combination is good), i go to the next stage e.g. open a new applet-servlet combination ?
I used to program with vbscript in .asp page (i know.....), and in that language there was the instruction redirect that allowed to redirect to another page when the results were being considered "valid", but i'm not sure that it is te way to do it in the applet-servlet world ...
Any hints, tricks,approach, are welcome......
thank you to all

The servlet API includes a method to redirect a client to a new webpage. For example:
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
    // do validation
    // redirect client
    response.sendRedirect(redirectURL);
}

JSP- Applet- Servlet- JSP

Ok, I know there are better ways to do what I am about to describe, but due to numerous circumstances this is my only option:
I have a JSP that runs an Applet - All Good
I have that Applet talk to a Servlet - All Good
I need that Servlet to the load the original JSP - How?
The entire process should look like this to the user:
1) Load JSP
2) Click a button, runs Applet
3) Applet communicates with Servlet
4) Servlet puts some data in the Request
5) The original JSP is reloaded in the same browser window
How do I do step #5?
-or-
Can I have the Applet put some data in the request and go directly to the JSP?

You can use the "response.sendRedirect(<String url>)" for Servlet.

Communication Applet - Servlet

Hello,
I'm trying to do a communication Applet - Servlet.
When i'm typing in my browser internet explorer
http://pcsm1:8080/servlet/MyServlet
My servlet is invoqued perfectly and i see the good message in the prompt ms-dos (cf MS-DOS PROMPT : MESSAGE OF THE SERVLET!)
But when i'm trying with my applet, i have a security exception : cannot access "pcsm1":8080
SERVLET :
public class MyServlet extends HttpServlet
public void init(ServletConfig config)
System.out.println("Servlet Init");
public void doGet(HttpServletRequest request,HttpServletResponse response)
ObjectOutputStream outputToApplet;
long data=69;
try
outputToApplet = new ObjectOutputStream (response.getOutputStream()); System.out.println("Sending data to applet...");
outputToApplet.writeLong(data);
outputToApplet.flush();
outputToApplet.close();
System.out.println("Data transmission complete.");
catch (IOException e)
public void doPost(HttpServletRequest request,HttpServletResponse response)
APPLET :
public class MyApplet extends Applet
public void init()
try
URL url = new URL("http://pcsm1:8080/servlet/MyServlet");
or
URL url = new URL(getCodeBase(),"http://pcsm1:8080/servlet/MyServlet");
URLConnection servletConnection = url.openConnection();
servletConnection.setDoInput(true);
servletConnection.setDoOutput(true);
servletConnection.setUseCaches (false);
servletConnection.setDefaultUseCaches (false);
servletConnection.setRequestProperty("Content-type","application/octet-stream");
ObjectInputStream inputFromServlet = new ObjectInputStream(servletConnection.getInputStream());
data = inputFromServlet.readLong();
inputFromServlet.close();
catch (Exception e)
MS-DOS PROMPT : MESSAGE OF THE SERVLET
when caller is internet explorer
C:\Servlet\bin>servletrunner -d "c:\servlet\bin"
servletrunner starting with settings:
port = 8080
backlog = 50
max handlers = 100
timeout = 5000
servlet dir = c:\servlet\bin
document dir = .\examples
servlet propfile = c:\servlet\bin\servlet.properties
Servlet Init
Sending data to applet...
Data transmission complete.
What can i do to avoid my security exception problem?
Very thanks...

Are MyServlet and the HTML page hosting MyApplet being served from the same server (i.e., pcsm1:8080)? If not, this is a violation of one of the security constraints placed on unsigned applets.
If the above scenario is the case, there are three options to overcome:
1) Create a signed applet
2) Move the HTML/Applet to the same server as the Servlet
3) On the server serving the HTML/Applet, create a "proxy" servlet to which the applet can connect and which will in turn contact MyServlet (through HttpURLConnection)

Problem in Applet Servlet communication in cluster

          Our new production server has been configured with
          clusters very recently.The application is running fine if and only if one instance
          of weblogic is running.The application has two applets that communicate through a
          servlet and the servlet is hosted by both the WL servers in the cluster.
          Please consider the following scenario :
          1. JSP#1(having embedded tag for Applet#1) is served by, say, WLInstance#1.
          2. JSP#2(having embedded tag for Applet#2) is served by, say, WLInstance#2.
          3. Applet#1 is loaded by BrowserInstance#1.
          4. Applet#2 is loaded by BrowserInstance#2.
          The way I understand applet-servlet communication is as follows :
          The servlets are invoked through the url-pattern specified in web.xml - if the applet
          is making use of a certain url-pattern that is mapped to servlet, then the call from
          that applet will
          eventually invoke a servlet on any of the two instances till a session is established,
          at which point all subsequent requests from the same browser window/frame will go
          to the servlet hosted on the instance where the http session was created.
          (Please correct me, if I am wrong.)
          So, Applet#1 will always talk to the servlet hosted by WLInstance#1 and Applet#2
          will always talk to the servlet hosted by WLInstance#2.
          In our case, the servlet is maintaining data structures to store all the messages
          sent by diffterent instances of Applets.
          The applets periodically polls the messages from those data structures.Once the messages
          are polled, those are deleted from
          the data structures.
          As there are two different instances of the servlet, Applet#1 never gets messages
          posted by Applet#2.
          Is there a way to make this data structure global to both the servlet instances?
          Thanks and best regards,
          Subir Das


          "Subir Das" <[email protected]> wrote:
          >So, Applet#1 will always talk to the servlet hosted by WLInstance#1 and
          >Applet#2
          >will always talk to the servlet hosted by WLInstance#2.
          This statement is not entirely true.
          Suppose WLInstance#1 were to be brought down (for whatever reason), Applet#1 will
          then talk to servlet hosted by WLInstance#2.
          Server pinning could be modified by different load balancing algorithms, configurable
          via containers (or hardware).
          So don't count on which servlet instance your applet is going to be served by.
          Instead consider to give a second look into the design of the servlet data structure
          (object):
          1.Read from data store, if it has been persisted.
          2.If the data is client related then consider sticking the data into session, which
          would then replicate to other WL instances.
          3.Stateless EJB in a cluster ? Don' know much about this(yet).
          My 2 cents..Good luck.
          Rama

Is VHDX for data drive considered good practice on a client PC?

Hi!
I don't like putting user's data files (documents, etc.) inside the user's Documents directory on C:. Instead I prefer having them on a D: disk, separate from the OS. On the other hand I don't want to create a fixed size partition as I consider it a waste
of space, especially when everything is on a rather small SSD.
Therefore, I consider creating a virtual hard disk (VHDX) on my C: drive and making it dynamically expanding. This would allow me to store data on that "separate" disk which is actually an expanding VHDX file on C:. One problem is that for some
unknown reason Windows 8.1 is not able to auto-attach such disks on startup, but I have seen some workarounds to auto-mount them through tasks.
My question is the following: Is it considered good practice to put all data files on such a dynamic VHDX instead on a separate partition? Reading the VHDX explanations it looks like this file format is very stable (even in case of power loss) and is widely
used in virtual servers. Performance should be also very good. Therefore I don't see any reason to not use it for my data drive. Or are there any drawbacks?
Thanks in advance for any help.
Best regards,
Anguel

Hi,
Since the VHDX is created on C which should be the system partition, I don’t think it is more safety than separate partition.
Please consider that once the system corrupted and we have to format the C to reinstall the System, it may be difficult for us to recovery the date. But the separated partition will be easily stayed without changes.
You can try to shrink the C volume in Disk management to create a new partition.
Just my thought.
Kate Li
TechNet Community Support

What is a good practice to handle LOV in jdev apps?

Hi, experts,
In jdev 11.1.2.3,
In our projects, there are many LOVs which the value are stored in a common dictionary table, for example in table refcode:
refcode(id, low_value,high_value,meaning,domain_no),
Different LOVs will retrieve value pairs(low_value,meaning) , or (high_value,meaning) from refcode table by using domain_no as the filtering criteria.
In the end user's UI, the code/number field values should be displayed by a meaning word from refcode,
To accomplish this goal, I will create numberous associations between different tables with refcode,
and create VOs to have refcode entity view as a secondary entity view.
I feel some odd in doing so(because so many associations with the same refcode table),
Is that a good practice to handle LOV this way ?
Thanks.

On Fusion Developer's Guide for Oracle Application Development Framework
10.3 Defining a Base View Object for Use with Lookup Tables
(http://docs.oracle.com/cd/E37975_01/web.111240/e16182/bclookups.htm#BABIBHIJ)
10.3.3 How to Define the WHERE Clause of the Lookup View Object Using View Criteria
There are valuable information and suggestions on implement lookup features, especially by using view criteria
(the View Criteria and View accessor is one of important and great idea in ADF)
I think, by using of view criteria, the derivative attribute to display fk information can be implemented in a convinent way without FK associations definition.

Applet Servlet communication compiles but does not communicate

Hi,
I have a applet which has a button named A. By clicking the button, the applet passes the letter A to the servlet. The servlet in turn accesses an Oracle database and retrieves the name corresponding to letter A from a table (name is Andy in the present case). The servlet interacts with the databse via a simple stored procedure and uses its output parameter to display the name Andy back in the applet.
Both the applet and servlet codes have compiled fine(servlet code compiled with -classpath option to servlet jar using a TOMCAT). However, on clicking button A in the applet, I do not get the name Andy.
Any help/suggestion in resolution of this is highly appreciated. Thanks in advance.
HTML CODE:
<html>
<center>
<applet code = "NameApplet.class" width = "600" height = "400">
</applet>
</center>
</html>
STORED PROCEDURE CODE:
procedure get_letter_description(
ac_letter IN CHAR,
as_letter_description OUT VARCHAR2) IS
BEGIN
SELECT letter_description INTO as_letter_description FROM letter WHERE letter =
ac_letter;
EXCEPTION
WHEN no_data_found THEN as_letter_description := 'No description available';
END get_letter_description;
APPLET CODE:
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.util.*;
import java.io.*;
import java.net.*;
public class NameApplet extends Applet implements ActionListener
private TextField text;
private Button button1;
private String webServerStr = null;
private String hostName = "localhost";
     private int port = 8080;
private String servletPath = "/examples/servlet/NameServlet?letter=";
private String letter;
public void init()
     button1 = new Button("A");
button1.addActionListener(this);
add(button1);
          text = new TextField(20);
     add(text);
// get the host name and port of the applet's web server
          URL hostURL = getCodeBase();
     hostName = hostURL.getHost();
port = hostURL.getPort();
          webServerStr = "http://" + hostName + ":" + port + servletPath;
public void actionPerformed(ActionEvent e)
     if (e.getSource() == button1)
     letter = "" + 'A';
private String getName(String letter){
String name = "" ;
try {
          URL u = new URL(webServerStr + letter);
          Object content = u.getContent();
name = content.toString();
     } catch (Exception e) {
     System.err.println("Error in getting name");
return name;
SERVLET CODE:
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.sql.*;
import java.util.Properties;
public class NameAppletServlet extends HttpServlet {
private static Connection conn = null;
private static final char DEFAULT_CHAR = 'A';
private static final char MIN_CHAR = 'A';
private static final char MAX_CHAR = 'G';
private static final String PROCEDURE_CALL
= "{call get_letter_description(?, ?)}";
protected void doGet( HttpServletRequest request,
HttpServletResponse response )
throws ServletException, IOException
handleHttpRequest(request, response);
protected void doPost( HttpServletRequest request,
HttpServletResponse response )
throws ServletException, IOException
handleHttpRequest(request, response);
protected void handleHttpRequest( HttpServletRequest request,
HttpServletResponse response )
throws ServletException, IOException
String phrase = null;
char letter = getLetter(request, DEFAULT_CHAR);
if (letter >= MIN_CHAR && letter <= MAX_CHAR) {
try {
name = getName(conn, letter);
} catch (SQLException se) {
String msg = "Unable to retrieve name from database.";
name = msg;
} else {
String msg = "Invalid letter '" + letter + "' requested.";
//throw new ServletException(msg);
phrase = msg;
response.setContentType("text/plain");
PrintWriter out = response.getWriter();
out.println(name);
private String getName(Connection conn, char letter)
throws SQLException
CallableStatement cstmt = conn.prepareCall(PROCEDURE_CALL);
cstmt.setString(1, String.valueOf(letter));
cstmt.registerOutParameter(2, Types.VARCHAR);
cstmt.execute();
String name = cstmt.getString(2);
cstmt.close();
return name;
private char getLetter(HttpServletRequest request, char defaultLetter) {
char letter = defaultLetter;
String letterString = request.getParameter("letter");
if (letterString!=null) {
letter = letterString.charAt(0);
return letter;
public void init(ServletConfig conf) throws ServletException {
super.init(conf);
String dbPropertyFile = getInitParameter("db.property.file");
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager.getConnection(
"jdbc:oracle:thin:myserver:1521:CDD",
"scott",
"tiger");
} catch (IOException ioe) {
throw new ServletException(
"Unable to init ReinforcementServlet: " + ioe.toString());
} catch (ClassNotFoundException cnfe) {
throw new ServletException(
"Unable to init ReinforcementServlet. Could not find driver: "
+ cnfe.toString());
} catch (SQLException se) {
throw new ServletException(
"Unable to init ReinforcementServlet. Error establishing"
+ " database connection: " + se.toString());
}

Hi,
I am not able to understand by which method you are doing Applet-Servlet commuincation.
If you want to use Object Serialization method, plz.get the details from following URL.
http://www.j-nine.com/pubs/applet2servlet/
Ajay

Applet/servlet communication for byte transmission

Hello all !
I wrote an applet to transfer binary file from web servlet (running under Tomcat 5.5) to a client (it's a signed applet) but I have a problem of interpretation of byte during transmission.
the code of the servlet is :
        response.setContentType("application/octet-stream");
        ServletOutputStream sos = response.getOutputStream();
        FileInputStream fis = new FileInputStream(new File(
                "C:\\WINDOWS\\system32\\setup.bmp"));
        byte[] b = new byte[1024];
        int nbRead = 1;
        while (nbRead > 0) {
            nbRead = fis.read(b);
            System.out.println("octets lus = " + nbRead);
            sos.write(b, 0, nbRead-1);
        fis.close();
        sos.close();et le code de l'applet qui appelle cette servlet est :
        URL selicPortal = null;
        try {
            selicPortal = new URL(
                    "http://localhost:8080/AppletTest/servlet/FileManipulation");
        } catch (MalformedURLException e) {
            e.printStackTrace();
        URLConnection selicConnection = null;
        try {
            selicConnection = selicPortal.openConnection();
        } catch (IOException e) {
            e.printStackTrace();
        selicConnection.setDoInput(true);
        selicConnection.setDoOutput(true);
        selicConnection.setUseCaches(false);
        selicConnection.setRequestProperty("Content-Type",
                "application/octet-stream");
        try {
            InputStream in = selicConnection.getInputStream();
            FileOutputStream fos = new FileOutputStream(new File(tempDir
                    + "\\toto.bmp"));
            byte[] b = new byte[1024];
            int nbRead = in.read(b);
            while (nbRead > 0) {
                fos.write(b);
            in.close();
            fos.close();
         } catch (IOException ioe) {
            ioe.printStackTrace();
        }the file dowloaded is broken. it seems that bytes 01 00 or 00 01 are not correctly process.
Some ideas to help me please ?

hi,
have you solved this issue.. please post me the code since i m also doing the applet/servlet communication and can use your code as reference.
how to read the content placed in the urlConnection stream in the servlet
Below is my code in applet
public void upload(byte[] imageByte)
          URL uploadURL=null;
          try
               uploadURL=new URL("<url>");
               URLConnection urlConnection=uploadURL.openConnection();
               urlConnection.setDoInput(true);
               urlConnection.setDoOutput(true);
               urlConnection.setUseCaches(false);
               urlConnection.setRequestProperty("Content-type","application/octet-stream");
               urlConnection.setRequestProperty("Content-length",""+imageByte.length);
               OutputStream outStream=urlConnection.getOutputStream();
               outStream.write(imageByte);
               outStream.close();
          catch(MalformedURLException ex)
          catch(IOException ex)
How can i read the byte sent on the outstream (in above code) in the servlet.
Thanks,
Mclaren

Asynchronous applet-servlet communication

Hi all,
I am trying to implement asynchronous applet-servlet communication and need your help. Anything would help(I tried with synchronous applet-servlet communication but doesn't solve my problem).
Thanks,

http://java.sun.com/docs/books/tutorial/networking/index.html
You can open a socket connection. Bother the client and the server
can have separate threads for reading and writing and that you gives you
asynchronous communication. Later, if you think the server is generating
too many threads and not scaling, you can use features of .java.nio to
make it more scalable:
java.nio.channels

JTable: RFC on good practice (SQL queries from cell editor)

I usually add/remove/edit JTable data from an external panel. But in this scenario, my client would like to be able to click on the first column of an empty row and enter a product number. Within the cell editor, I must make an SQL query to the database in order to determine if the product number is valid and if so, use part of the SQL data to populate other cells of the current row (like product description).
My problem is that this just doesn't seem right! Isn't the cell editor executed on the only Swing thread? Also, if the product number is not valid, I correctly implement the stopCellEditing() method but for some reason, you can still navigate the table (click on any other cell or press the TAB key, etc)... weird!!
Does anyone have a good practice on how to perform the SQL query in a better place and force a cell to be selected until you enter a valid number or press the CANCEL key?
I was looking at implementing the TableModelListener's tableChanged(...) method but I'm not sure if that would be a better place either.
I personally would edit outside of the table, but good practice seems hard when the requirement is to edit from a cell editor!!
Any suggestion would be greatly appreciated!
Thanks!

maybe you could write an input verifier for the column that does the query and rejects invalid entries.
maybe you could send the query off in a worker thread.
as far as making the table so you can't select any cells, hmm. not sure.
you could disable
.setEnabled(false);the table until the query comes back, something like that.

Applet-servlet communication, object serialization, problem

hi,
I encountered a problem with tomcat 5.5. Grazing the whole web i didn't find any solution (some guys are having the same problem but they also got no useful hint up to now). The problem is as follows:
I try to build an applet-servlet communication using serialized objects. In my test scenario i write a serialized standard java object (e.g. a String object) onto the ObjectOutputStream of the applet/test-application (it doesn't matters wheter to use the first or the latter one for test cases) and the doPost method of the servlet reads the object from the ObjectInputStream. That works fine. But if i use customized objects (which should also work fine) the same code produces an classnotfound exception. When i try to read and cast the object:
TestMessage e = (TestMessage)objin.readObject();
java.lang.ClassNotFoundException: TestMessage
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1359)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1205)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
...That seems strange to me, because if i instantiate an object of the same customized class (TestMessage) in the servlet code, the webappclassloader doesn't have any problems loading and handling the class and the code works fine!
The class is located in the web-inf/classes directory of the application. I've already tried to put the class (with and without the package structure) into the common/classes and server/classes directory, but the exception stays the same (I've also tried to build a jar and put it in the appropriate lib directories).
I've also tried to catch a Throwable object in order to get information on the cause. But i get a "null" value (the docu says, that this will may be caused by an unknown error).
I've also inspected the log files intensively. But they gave me no hint. Until now I've spend a lot of time on searching and messing around but i always get this classnotfound exception.
I hope this is the right place to post this problem and i hope that there is anyone out there who can give me some hint on solving this problem.
Kindly regards,
Daniel

hi, thanks for the reply,
all my classes are in the web-inf/classes of the web-app and have an appropriate package structure. thus the TestMessage class is inside a package.
i tried some names for the testclass but it didn't matter. the exception stays the same. I also tried to put the jar in the common/lib but the problem stays.
Well the problem with loaded classes: As i mentioned in the post above i can instantiate an object of TestMessage in the code without any problems (so the classloader of my webapp should know the class!!)
only when reading from the objectinputstream the classloader doesn't seem to know the class?? maybe theres a parent classloader resposible for that and doesn't know the class?
strange behaviour...
p.s. sending the same object from the servlet to the client works well
regards
daniel
Message was edited by:
theazazel

Applet-Servlet or RMI - which is better

We are in the process of developing a swing-applet based system that requires regular interaction with multiple databases residing on more than one database server.
The options available before us, as we evaluate are:
a. Use "signed" applets ( as this is going to be essentially an intra-net application) and use JDBC connection to connect to more than one database ( which reside on servers other than the web server).
b. Use applet - servlet communication - basically, the servlet would establish connection to the databases, directly or through EJB, retrieve necessary database information and pass on the objects to the applet - the front end GUI would be controlled by the applet.
c. Use RMI
We would like to have your perspective of the three options, with your experience in this line.
The questions that come to us are:
a. If the system is essentially an intra-net application, is it okay to design with "signed" applet mechanism - how far is this method common in the market and acceptable to the clients? Is it true that the signed applet would be able to establish connection to various "identified servers" that are allowed permissions in the security file?
b. Between applet-servlet and RMI, which is a better method? What should be the factors that need to be considered? Is RMI being widely used or should we be thinking in terms of EJB, eventhough the current project is purely a Java based solution.
Your input is highly appreciated - thanking in advance for any suggestions and inputs that you may provide.
Thanks
Dixie

Dixie,
1) IMHO signed applets are not widely used, but you can use
ordinary applets, which are accessing other resources through
redirector servlet on server side - I mean ordinary applets
are prohibited to establish connect to other than it's own server.
So you will be forced to have special servlet on your server,
which have access to other resources on other servers - this is a
way how to avoid applets limitation.
2) RMI is a heavy solution, because all parameters/objects should
be serialized over net and if network connection is unreliable
working with system will be just a nighmare.
3) If you think that your network connection is unreliable, you can use HTTP protocol between client and server instead of RMI. In this case
you will have following benefits:
i) You can still use all of powerness of thick client
ii) Network unreliability will be defeated
iii) Sometime if you would like to port your application to a thin
client it will be done much more easier than in case of RMI
4) If you would like to use thin client your only problem will
be poorness of UI - if you can go with it - go ahead! Otherwise
use thick client with RMI or HTTP depending on quality of network.
Paul

Applet+servlet+good practice

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