Calling a Method in a Parent Class

I have Class A that instantiates Class B which in turn instantiates Class C. Is there a way to call a method in Class A from Class C without having to pass a reference of A all the way down to C? Is there thread stack information that I can access that will allow me to get Class A's 'handle'?

tpaulsz wrote:
The OP is not confusing instantiates with inherits.
Class A is class that's exposing web service methods.
Class B represents a group of business rule classes.
Class C is transaction handler class that is responsible for checking out connections from a db connections pool.
The web services all require user information, for auth and auth purposes, and they've not been required outside of Class A - until now. I now have to provide RLS on the database information so I need the user information for the Oracle Proxy User connection property.
This is a very mature application with many Class A and Class B classes so passing the user information from class to class would be a big job. Furthermore, there are some non-user processes that will also be calling on Class C that don't need RLS. Since the StackElements are available through Thread.currentThread().getStackTrace(), I was hoping that there was another stack that I could traverse to eventually find a Class A class that's been set up with an with interface that has a getUserInfo method.Any you wanted to extract the user info for every single database operation even when a single business rule calls more than one?
Or when a single web service operation calls more than one business rule?
If you don't do that then how did you plan on letting method B know that method A has already done it?
You might be able to stick the data in a ThreadLocal if there is in fact only one thread of execution.
Myself I always considered attempting to manage web users of a business application via a a database or OS authentication to be more trouble than it was worth.

Similar Messages

Calling a method from a super class

Hello, I'm trying to write a program that will call a method from a super class. This program is the test program, so should i include extends in the class declaration? Also, what code is needed for the call? Just to make things clear the program includes three different types of object classes and one abstract superclass and the test program which is what im having problems with. I try to use the test program to calculate somthing for each of them using the abstract method in the superclass, but its overridden for each of the three object classes. Now to call this function what syntax should I include? the function returns a double. Thanks.

Well, this sort of depends on how the methods are overridden.
public class SuperFoo {
public void foo() {
     //do something;
public void bar(){
     //do something
public class SubFoo extends SuperFoo {
   public void foo() {
      //do something different that overrides foo()
   public void baz() {
      bar(); //calls superclass method
      foo(); //calls method in this (sub) class
      super.foo(); //calls method in superclass
}However, if you have a superclass with an abstract method, then all the subclasses implement that same method with a relevant implementation. Since the parent method is abstract, you can't make a call to it (it contains no implementation, right?).

Getting Bad Type Error when calling a method in the proxy class

Hi,
I have generated the proxy classes from wsdl.
When I am calling the methods in the proxy class from one of external class, I am getting following error.
Can anyone please help me in resolving this issue.
javax.xml.ws.soap.SOAPFaultException: org.xml.sax.SAXException: Bad types (interface javax.xml.soap.SOAPElement -> class com.intraware.snetmgr.webservice.data.SubscribeNetObjectReference) Message being parsed:
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Thanks
Anoop

Hi Vlad,
The service has not been changed since i have generated the proxy.
I tried calling the service from soapUI and I am getting the following error now.
Request:
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:uri="uri:webservice.subscribenet.intraware.com" xmlns:uri1="uri:subscribenet.intraware.com">
<soapenv:Header>
<uri:SessionHeader>
<uri:SessionID>hjkashd9sd90809dskjkds090dsj</uri:SessionID>
</uri:SessionHeader>
</soapenv:Header>
<soapenv:Body>
<uri:Find>
<uri:SubscribeNetObjectReference>
<uri1:ID></uri1:ID>
<uri1:IntrawareID></uri1:IntrawareID>
<uri1:SharePartnerID></uri1:SharePartnerID>
</uri:SubscribeNetObjectReference>
</uri:Find>
</soapenv:Body>
</soapenv:Envelope>
Response:
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Header/>
<soapenv:Body>
<soapenv:Fault>
<faultcode>soapenv:Server.generalException</faultcode>
<faultstring>org.xml.sax.SAXException: WSWS3279E: Error: Unable to create JavaBean of type com.intraware.snetmgr.webservice.data.SubscribeNetObjectReference. Missing default constructor? Error was: java.lang.InstantiationException: com.intraware.snetmgr.webservice.data.SubscribeNetObjectReference. Message being parsed:</faultstring>
</soapenv:Fault>
</soapenv:Body>
</soapenv:Envelope>
Thanks
Anoop

Calling a method in a different class?

How do you call a method from a differnt class into the class you are working on?

Class and method were just generic names. You should insert the names of your classes and methods.
class OtherClass {
    public static void one() {
        System.out.println("Static method")l;
    public void two() {
        System.out.println("Non-static method");
class MainClass {
    public static void main(String[] args) {
        OtherClass.one();
        OtherClass oc = new OtherClass();
        oc.two();
}

How to call a method from a separate class using IBAction

I can't work out how to call a method form an external class with IBAction.
//This Works 1
-(void)addCard:(MyiCards *)card{
[card insertNewCardIntoDatabase];
//This works 2
-(IBAction) addNewCard:(id)sender{
//stuff -- I want to call [card insertNewCardIntoDatabase];
I have tried tons of stuff here, but nothing is working. When i build this I get no errors or warnings, but trying to call the method in anyway other that what is there, i get errors.

Can you explain more about what you are trying to do? IBAction is just a 'hint' to Interface Builder. It's just a void method return. And it's unclear what method is where from your code snippet below. is addNewCard: in another class? And if so, does it have a reference to the 'card' object you are sending the 'insertNewCardIntoDatabase' message? Some more details would help.
Cheers,
George

Can we call a method from a adapter class?

Hi
I have added KeyAdapter class to a textfield now i want to call a method in the outer class from inside the adapter class. I tried but its showing some error,
public class A
A()
TF1.addKeyListener(new KeyAdapter()
public void keyReleased(KeyEvent e)
A a=new A();
ec.chkSalary();
chkSalary()
can i call the method like this?

yeah.. i got it.. i just passed that KeyEvent object to the method
but i did declare that as a char in that method like,
chkSalary(e) // e is the KeyEvent reference
and the method is
chk(char e);
thats it.
thank you yaar.

Need help calling a method from an immutable class

I'm having difficulties in calling a method from my class called Cabin to my main. Here's the code in my main              if(this is where i want my method hasKitchen() from my Cabin class)
                    System.out.println("There is a kitchen.");
               else
                    System.out.println("There is not a kitchen.");
               }and here's my method from my Cabin class:public boolean hasKitchen()
     return kitchen;
}

You should first have an instance of Cabin created by using
   Cabin c = ....
   if (c.hasKitchen()) {
     System.out.println("There is a kitchen.");
   } else {
        System.out.println("There is not a kitchen.");
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Calling a method from an abstract class in a seperate class

I am trying to call the getID() method from the Chat class in the getIDs() method in the Outputter class. I would usually instantiate with a normal class but I know you cant instantiate the method when using abstract classes. I've been going over and over my theory and have just become more confused??
Package Chatroom
public abstract class Chat
   private String id;
   public String getID()
      return id;
   protected void setId(String s)
      id = s;
   public abstract void sendMessageToUser(String msg);
Package Chatroom
public class Outputter
public String[] getIDs()
     // This is where I get confused. I know you can't instantiate the object like:
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        users.getID();
I have the two classes in the package and you need to that to be able to use a class' methods in another class.
Please help me :(

I have just looked over my program and realised my class names are not the most discriptive, so I have renamed them to give you a clearer picture.
package Chatroom
public abstract class Chatter
private String id;
public String getID()
return id;
protected void setId(String s)
id = s;
I am trying to slowly build a chatroom on my own. The Chatter class is a class that will be used to represent a single logged in user and the user is given an ID when he logs in through the setId and getID() methods.
package Chatroom;
import java.util.Vector;
public class Broadcaster
private Vector<Chatter> chatters = new Vector<Chatter>();
public String[] getIDs()
// code here
The Broadcaster class will keep a list of all logged-in users keeps a list of all the chats representing logged-in users, which it stores in a Vector.I am trying to use the getIDs() method to return an array of Strings comprising the IDs of all logged-in users, which is why im trying to use the getID() method from the Chat class.
I apologise if I come across as clueless, it's just I have been going through books for about 4 hours now and I have just totally lossed all my bearings

Calling a method in a different class. PLEASE HELP!!

For my java class I am writing a program on exceptions. Bascially this is the skeleton of the program that I have written. The program is too long to type in this messgae.
class ryan
includes main
suberror2 is called from here
suberror 3 is called from here
class BaseRT
includes method basemakeserror
class SubMS extends BaseRT
basemakeserror is called from here(The error I get is with this line)
includes method subCallsError
includes method subError2
includes method subEoor3
Here is my problem: Whenever I run my program I keep getting an error that says baseMakesError1 in Ryan.BaseRT cannot be applied to Ryan.SubRT. Can anyone help me and tell me what I'm doing wrong. I would really appreciate it.

Odd, you've extended the class, so there should be no problem in calling the method. We would need to see more, such as the implementation of the method (i.e. what it does) to find out more, but in theory, you should have no problem. Did you declare the method public?

Call a method/Functio in a class using MouseOver StaticText - Please help!!

Hello, I have an array of unknown size of Static Text component's of the type com.sun.rave.web.ui.component.StaticText, They're named "st_utp_1", "st_utp_2", "st_utp_3".... so forth.
I have a class called "Page1.class" in this class I have a Method(or function, please correct me on that). called declared as:
public void utp(int utv) {
}When I mouse over a particular StaticText box, I would like it to call the method "utp(x);" where x is the last number in the StaticText ID. for example, If I mouseOver "st_utp_23" I would like it to call the method "utp(23);", If I then mouseOver "st_utp_107" I would like to call the method as "utp(107);".
Currently I can't get any StaticText to call any method in my class file with a mouseOver function. I can however call my method successfully from within the class file itself.
Please, can anyone help me?
Looking forward to the response. Cheers

Cheers, thanks for the quick response
I imagine you mean something like this
public void init() {
      st_utp_1.addMouseListener(new MouseAdapter() {
          public void mouseEntered(MouseEvent e) {
              utptab(1);
}The problem is that the statiicText componet "st_utp_1" is of type "com.sun.rave.web.ui.component.StaticText"
It comes up with the error:
symbol : method addMouseListener(<anonymous java.awt.event.MouseAdapter>)
location: class com.sun.rave.web.ui.component.StaticText
st_utp_1.addMouseListener(new MouseAdapter()
If I create a new Jlabel called "jl_utp_1" and write the same code:
public void init() {
      jl_utp_1.addMouseListener(new MouseAdapter() {
          public void mouseEntered(MouseEvent e) {
              utptab(1);
}it executes without a problem, I believe it's the type of StaticText compnent I'm using.
Any more help would be appreciated.

How to call a method of an Action class from JSP on load?

Hi guys
Due to bad design pattern, i am forced to do something which i have not tried before.
I need to call a method of a struts action class which invalidated the user session FROM the JSP itself on load. Which means it would not require user input.
We have a subclass of a DispatchAction that handles all the incoming .dos.
So http://blarblarblar:7001/blar/blar/doSomething.do?method=logout will dispatch to an Action class called DoSomething, into a method called logout().
So when the webapp throws an exception, the ActionMapping actually displays an error.jsp and i have to invalidate the user at this stage.
I can't change the most top level code in the base action class so i got to do it this way.
Any help is much appreciated.
Thanks.

hi :-) DispatchAction is quite cool ;-)
dont get much of your question but hope
the suggestion below could help.
A. use redirect?
or
B. autosubmit the form
1. create your form in a jsp
   <html:form action="/doSomething" />
     <html:hidden name="method" value="logout" />
   </html:form>2. auto submit the form with method = logout
put the function autosubmit in the "onLoad" event of the body
   <script>
     function autosubmit(){
     var form = document.yourformname;
     form.submit();
   <script>regards,

How to make set up with first call of method of a custom class?

Hello
I have build a custom class with a few custom methods.
Method1 is called per every record of internal table. I need to set up certain parameters tha are the sme for all the calls (populate the range , to fill the internal table , etc). This should be done only once.
call method ZBW_CUSTOM_FUNCTIONS=>METHOD1
        exporting
          I = parameter1
        importing
          O = parameter2.
Loop at ....
   <itab>-record1 = parameter2
endloop.
Methods2, 3 , 4 dont need any set up.
Can somebody tell me how to do it within class?
Thanks

Instance methods (as opposed to static methods) are called on an object, which is an instance of a class. Broadly, think of the class as a template for the creation of objects. The objects created from the class take the same form as the class, but have their own state -- their own attribute values. In pseudo-ABAP (this won't even close to compile), let's say you have the following class:
CLASS cl_class.
     STATICS static_attr TYPE string.
     DATA attr1 TYPE string.
     DATA attr2 TYPE i.
     CLASS-METHOD set_static_attr
          IMPORTING static_attr TYPE string.
          cl_class=>static_attr = static_attr.
     ENDMETHOD.
     METHOD constructor
          IMPORTING attr1 TYPE string
                             attr2 TYPE i.
          me->attr1 = attr1.
          me->attr2 = attr2.
     ENDMETHOD.
     METHOD get_attr1
          RETURNING attr1 TYPE string.
          attr1 = me->attr1.
     ENDMETHOD.
ENDCLASS.
When you create an instance of the class (with CREATE OBJECT oref), the constructor is implicitly called. You can pass parameters to the constructor using: CREATE OBJECT oref EXPORTING attr1 = 'MyString' attr2 = 4.
You then call methods on the instance you have created. So, oref->get_attr1( ) would return 'MyString'.
The constructor is called when the object is created (so, when you call CREATE OBJECT). At this time, the setup is done, and any subsequent methods you call on the object will be able to use the attributes you set up in the constructor. Every object has its own state. If you had another object, oref2, changing its instance attribute values would not affect the values of oref.
Static methods and attributes are different. A static attribute exists only once for all instances of the class -- they share a single value (within an internal session, I think. I'm not sure of the scope off-hand.) You also call static methods on the class itself, not on instances of it, using a different selector (=> instead of ->). So, if you called cl_class=>set_static_attr( static_attr = 'Static string' ), 'Static string' would be the value of static_attr, which belongs to the class cl_class, and not instances of it. (You can also set up a class constructor, which is called when the class is loaded, but that's another subject.)
To answer your question more succinctly: no, the constructor is not called before each method. It is only called when you create the object. Any subsequent methods called on the object can then access its attributes.
Please have a look at [http://help.sap.com/saphelp_nw70ehp2/helpdata/en/48/ad3779b33a11d194f00000e8353423/frameset.htm] for a more thorough treatment of basic object concepts. (The rest of that documentation is very thin, but it'll get you started. Also, it doesn't appear to deal with statics. You'll have to look elsewhere for that.)

Problems calling a method from a different class

Like many programmers, I'm having a go at making my own chat room. All has been going well so far, however I am having trouble calling the method which connects the client to the server, from the method which actually starts the server.
The method for starting the server:
public static void serverStart () throws IOException {
        new Thread () {
        public void run() {
            try {
                ServerSocket serverSock = new ServerSocket (client.serverPort);
            while (true) {
                Socket serverClient = serverSock.accept ();
                ChatHandler handler = new ChatHandler(serverClient);
                handler.start ();
            } catch (IOException ex) {
                connectTo.handleIOException(ex);
        }.start();
        try {
            connectTo.start();
        } catch (IOException ex) {
            connectTo.handleIOException(ex);
    }The part of interest is the "connectTo.start()" line, as this is the one which calls a method in the class connectToMethod which tells the client to connect to this newly started server. Now for the client connection code:
public synchronized void start () throws IOException {
      if (listener == null) {
          Socket socket = new Socket (client.serverAddr, client.serverPort);
          try {
              dataIn = new DataInputStream
                      (new BufferedInputStream (socket.getInputStream ()));
              dataOut = new DataOutputStream
                      (new BufferedOutputStream (socket.getOutputStream ()));
          } catch (IOException ex) {
          socket.close ();
          throw ex;
      listener = new Thread (this);
      listener.start ();
}Now when the server starts, it should automatically start the connection method "start()" and connect to itself. However I am getting a NullPointerException error at the line "connectTo.start();" from the server code. The server and connection client actually work separately, just not when I try to connect from the server itself. I have tried a few ways of getting around this problem, all without success. If anyone could give some input on what might be wrong, or a possible way to fix it, I'd be very grateful.

Sorry, connectTo comes from:
connectToMethod connectTo = new
connectToMethod();
That doesn't necessarily mean this variable reference is the same one as in the code where the NullPointerException was thrown though.
Or the exception was thrown inside the start() method. The runtime isn't lying to you. You have a null reference (pointer) where it says you do.

Calling a method from a different class?

Ok..
I been trying for hours... but im stumped.
How can I get this to work?
(Note: I cut this code down from over 600+ lines of code.. I left in a REALLY raw framework that shows where the basic problem is.)
public class Client extends JPanel implements Runnable {
// variable declarations...
    Socket connection;
    BufferedReader fromServer;
    PrintWriter toServer;
    public Client(){
// GUI creation...
// Create the login JFrame
    Login login = new Login()
    public void connect(){
    try {
            //Attempt to connect to the server
            connection = new Socket(ip,port);
            fromServer = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            toServer = new PrintWriter(connection.getOutputStream());
            //Launch a thread here to read incoming messages from the server
            //so I dont block on reading
            new Thread (this).start();
    } catch (Exception e) {
        e.printStackTrace();
    public void run(){
        // This keeps reading lines from the server
        String s;
        try {
            //Read messages sent from the server - add them to chat window
            while ((s=fromServer.readLine()) != null) {
            txtChat.append(s);
        } catch (Exception e) {}
    public static void main(String args[]){
        // some init frame stuff
        frame = new JFrame();
        frame.getContentPane().add(new Client(),BorderLayout.CENTER);
     frame.setVisible(true);
class Login extends JFrame {
    JPanel pane;
    public Login() {
     super("Login");
     pane = new JPanel();
     JButton cmdConnect = new JButton("Connect");
        pane.add(cmdConnect);
     setContentPane(pane);
     setSize(300,300);
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     cmdConnect.addActionListener(new ActionListener(){
         public void actionPerformed(ActionEvent ae){
          // I want to connect to the server when this button is pressed.
          // How can I call the connect method in the Client class?
}

Your posted code shows Login as an inner class. So one way to solve your problem is.
1. Make an instance variable to hold the instance. For example, after "PrintWriter toServer;" add "private Client client;"
2. In the Client constructor, add a line "client = this;"
3. In the Login actionPerformed(), use "client.connect();"
Another way is to have Login keep a reference to the Client that created it.
1. Add an instance variable to Login "private Client client;"
2. Change the Login constructor "public Login(Client c) {"
3. Add a line in the constructor "client = c;"
4. In the actionPerformed() "client.connect();"

Calling a method in a parent container

Hi Everyone,
In my primary application, I have a a method that is called when the application starts to run....
The method in the delegate is
initializeMasterDatabase
It is originally called from the delegate in the applicationDidFinishLaunching event
[self initializeMasterDatabase]
This all works ok, and the database is initialize upong application startup.
Now, within a different controller, I would like to execute the initializeMasterDatabase method that resides in the delegate part of the application.
I am trying this
parent_delegate *appDelegate = (parent_delegate *)[[UIApplication sharedApplication] delegate];
....removed code....
[appDelegate initializeMasterDatabase];
One the initializeMasterDatabase line...
i am getting this warning
'appDelegate ' may not respond to '-initializeMasterDatabase'
I cannot tell is the event is being run outside of the initial loading phase,
so.....
How do I execute a method in a delegate (parent)???
thanks
tony

That was the ticket.... I did not delcare the method in the header file.
Thanks a million for the help!
take care
tony

Calling a Method in a Parent Class

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