Some java object assignment problem

Hi,
here is some code ---
class point
int x;
getx(){
return x;
setx(int x)
this.x = x;
class Immutable {
private point p;
getp(){
return p;
setp(point p)
this.p = p;
Immutable nn = new Immutable();
i have to assign p.x=-5; without touching setp() method
please help me
im_kumar_mohan: tell me answer and how can i solve

What's the problem - the immutable wrapper is not doing what it's name is recommending anyway:
nn.getp.setx(-5)should do exactly, what you want to have.

Similar Messages

Storage of Java object in table column

Hello,
We have developed an application that requires some Java objects to be stored in tables.
With JDataStore, Cloudscape or InstantDB the operation is rather straightforward. We can use something like:
pstmt = conn.prepareStatement("INSERT INTO TABLEOBJ(ID,OBJ) VALUES (?,?)");
pstmt.setLong(1,i);
pstmt.setObject(2,myObject);
psmt.executeUpdate();
Some of our clients would like us to use Oracle Lite rather than any of the previously mentioned databases. The only problem is that the above simple code does not work with Oracle.
What is then the easiest way to save Java Object in table column?
Thanks in advance,
Benoit Marchal

found part of the answer in another newsgroup.
But is Oracle Lite 4.0 offering the same possibility? Is it going to be implemented in Oracle Lite 5.0?
Benoit
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Alexander Day ([email protected]):
Another little tidbit from ORacle's documentation:
"Important: The JDBC 2.0 specification states that PreparedStatement methods setBinaryStream() and setObject() can be used to input a stream value as a BLOB, and
that the PreparedStatement methods setAsciiStream(), setUnicodeStream(), setCharacterStream(), and setObject() can be used to input a stream value as a CLOB. This
bypasses the LOB locator, going directly to the LOB data itself. In the implementation of the Oracle JDBC drivers, this functionality is supported only for a configuration using an 8.1.6 database and
8.1.6 JDBC OCI driver. Do not use this functionality for any other configuration, as data corruption may result."<HR></BLOCKQUOTE>
null

Send Java objects through a socket

I want to send some java objects to a J2SE server from a J2me socket. In normal j2me socket there is no way of putting whole obejct to the output stream. Is there any way that you can send a object from a socket ? Please advice..
Thanks.

Check this article on making serializable objects in MIDP. If the objects you want to send receive across the network implement this, then you can easily transform them into byte arrays and back to objects so they can be sent across a network.
shmoove

Problem with XMLEncoder for complex java object i

Hi All.
My problem with XMLEncoder is it doesnt transfrom java objects without default no arguement constructor. I was able to resolve this in my main java object class, by setting a new persistence delegate, but for other classes that are contained in the main class, they are not being encoded.
Thanks in advance for your answers

Better to put this in java forum :-)
Just check, if this helps.
http://forum.java.sun.com/thread.jspa?threadID=379614&messageID=1623434

How do you search through configured Alternate Extensions to correct error message : The phone number or extension has already been assigned to some other object.

When configuring a new Unity Voicemail Account I receive this message : The phone number or extension has already been assigned to some other object. I understand that this means that the 10 digit number I am trying to configure as the alternate extension for this user is already configured for another object with Unity.
I need to search by the 10 digit number and determine where it is configured so I can change it and map to the correct end user.
I have attempted to to search Users via DTMF Access ID using the 10 digit number with nothing being returned via that search.
How do I Search all of the copnfigured Alternate Extensions within our Unity Server?

A subscriber info dump is likely the fastest way. If you're curious regarding other methods, you can also use the Data Link Explorer (CUDLE) tool which is in the Cisco Unity Tools Depot. All extensions for all objects are referenced in the "DTMFAccessId" table. The View menu has a Query Builder which you can use to compile a SQL query that searches for a digit string. It's best to search for both the 10 digit string as well as an abbreviated string as Unity sees them essentially the same and they are usually should be associated with a single subscriber. Once you find a match, you can use the "ParentObjectId" value associated with the DTMF access ID to look for a matching owner in the "GlobalSubscriber" table. The ParentObjectId should match the SubscriberObjectId for a subscriber (assuming the DTMF access ID is assigned to a subscriber). This is the same thing as looking at SQL; however, you are not directly accessing the DB so this is generally considered the safest way to browse and get a feel for where things are.
Hailey

Problem when adding java objects in a vector and passing thru web service

Hi! I'm getting this error when I try to add a java object I created into a vector and passing it through a web service: java.lang.IllegalArgumentException: No Serializer found to serialize a 'testObj' using encoding style 'http://schemas.xmlsoap.org/soap/encoding/'
This does not happen when I simply add strings or Integer objects into the vector. What am I missing?
Thanks.

just chek this
http://forum.java.sun.com/thread.jspa?threadID=501189&messageID=2370914
Edited by: garava on Jul 16, 2008 1:13 PM.
It would be great if you could paste the wsdl part for that vector and just have a look for the complex typr cntent
like for HashMap we have the following mapping
<complexType name="HashMap">
<sequence>
    <element name="item" minOccurs="0" maxOccurs="unbounded">
      <complexType>
        <sequence>
          <element name="key" type="anyType" />
          <element name="value" type="anyType" />
        </sequence>
      </complexType>
    </element>
</sequence>
</complexType>Since in Value it should again contain a mapping for the Object which you are trying to pass then only an appropriate serializer and deserilaizer would get generated. Hope this answers your query. For refernece
http://www.theserverside.com/tt/articles/article.tss?l=Systinet-web-services-part-2
[http://www.theserverside.com/tt/articles/article.tss?l=Systinet-web-services-part-2|For refernce tutorial]
Thanks,
Avadhoot Sawant.
Edited by: garava on Jul 16, 2008 1:16 PM

Problem in CO object assignment

Hi experts,
Can any one tell me is it possible to extend an internal order of a product in different company code?
Presently the product has been created under a company code along with it's internal order. When I am going to bill this product under different company code then system is asking for 'CO object assignment' in that specific company code.
Please suggest.
Thanks & regards,
Rupam.
Edited by: RUPAM KR SEN on Feb 24, 2011 11:58 AM
Edited by: RUPAM KR SEN on Feb 24, 2011 11:59 AM

Hi,
No,it is not possible to extend one internal order to another company code.
Please check with your FICO consultant to create a new Internal order under your company code.
Regards,
Krishna.

How to parse XML to Java object... please help really stuck

Thank you for reading this email...
If I have a **DTD** like:
<!ELEMENT person (name, age)>
<!ATTLIST person
     id ID #REQUIRED
>
<!ELEMENT name ((family, given) | (given, family))>
<!ELEMENT age (#PCDATA)>
<!ELEMENT family (#PCDATA)>
<!ELEMENT given (#PCDATA)>
the **XML** like:
<person id="a1">
<name>
     <family> Yoshi </family>
     <given> Samurai </given>
</name>
<age> 21 </age>
</person>
**** Could you help me to write a simple parser to parse my DTD and XML to Java object, and how can I use those objects... sorry if the problem is too basic, I am a beginner and very stuck... I am very confuse with SAXParserFactory, SAXParser, ParserAdapter and DOM has its own Factory and Parser, so confuse...
Thank you for your help, Yo

Hi, Yo,
Thank you very much for your help. And I Wish you are there...I'm. And I plan to stay - It's sunny and warm here in Honolulu and the waves are up :)
A bit more question for dear people:
In the notes, it's mainly focus on JAXB,
1. Is that mean JAXB is most popular parser for
parsing XML into Java object? With me, definitely. There are essentially 3 technologies that allow you to parse XML documents:
1) "Callbacks" (e.g. SAX in JAXP): You write a class that overrides 3 methods that will be called i) whenever the parser encounters a start tag, ii) an end tag, or iii) PCDATA. Drawback: You have to figure out where the heck in the document hierarchy you are when such a callback happens, because the same method is called on EACH start tag and similarly for the end tag and the PCDATA. You have to create the objects and put them into your own data structure - it's very tedious, but you have complete control. (Well, more or less.)
2) "Tree" (e.g. DOM in JAXP, or it's better cousin JDOM): You call a parser that in one swoop creates an entire hierarchy that corresponds to the XML document. You don't get called on each tag as with SAX, you just get the root of the resulting tree. Drawback: All the nodes in the tree have the same type! You probably want to know which tags are in the document, don't you? Well, you'll have to traverse the tree and ask each node: What tag do you represent? And what are your attributes? (You get only strings in response even though your attributes often represent numbers.) Unless you want to display the tree - that's a nice application, you can do it as a tree model for JTree -, or otherwise don't care about the individual tags, DOM is not of much help, because you have to keep track where in the tree you are while you traverse it.
3) Enter JAXB (or Castor, or ...): You give it a grammar of the XML documents you want to parse, or "unmarshall" as the fashion dictates to call it. (Actually the name isn't that bad, because "parsing" focuses on the input text while "unmarshalling" focuses on the objects you get, even though I'd reason that it should be marshalling that converts into objects and unmarshalling that converts objects to something else, and not vice versa but that's just my opinion.) The JAXB compiler creates a bunch of source files each with one (or now more) class(es) (and now interfaces) that correspond to the elements/tags of your grammar. (Now "compiler" is a true jevel of a misnomer, try to explain to students that after they run the "compiler", they still need to compile the sources the "compiler" generated with the real Java compiler!). Ok, you've got these sources compiled. Now you call one single method, unmarshall() and as a result you get the root node of the hierarchy that corresponds to the XML document. Sounds like DOM, but it's much better - the objects in the resulting tree don't have all the same type, but their type depends on the tag they represent. E.g if there is the tag <ball-game> then there will be an object of type myPackage.BallGame in your data structure. It gets better, if there is <score> inside <ball-game> and you have an object ballGame (of type BallGame) that you can simply call ballGame.getScore() and you get an object of type myPackage.Score. In other words, the child tags become properties of the parent object. Even better, the attributes become properties, too, so as far as your program is concerned there is no difference whether the property value was originally a tag or an attribute. On top of that, you can tell in your schema that the property has an int value - or another primitive type (that's like that in 1.0, in the early release you'll have to do it in the additional xjs file). So this is a very natural way to explore the data structure of the XML document. Of course there are drawbacks, but they are minor: daunting complexity and, as a consequence, very steep learning curve, documentation that leaves much to reader's phantasy - read trial and error - (the user's guide is too simplicistic and the examples too primitive, e.g. they don't even tell you how to make a schema where a tag has only attributes) and reference manual that has ~200 pages full of technicalities and you have to look with magnifying glas for the really usefull stuff, huge number of generated classes, some of which you may not need at all (and in 1.0 the number has doubled because each class has an accompanying interface), etc., etc. But overall, all that pales compared to the drastically improved efficiency of the programmer's efforts, i.e. your time. The time you'll spend learning the intricacies is well spent, you'll learn it once and then it will shorten your programming time all the time you use it. It's like C and Java, Java is order of magnitude more complex, but you'd probably never be sorry you gave up C.
Of course the above essay leaves out lots and lots of detail, but I think that it touches the most important points.
A word about JAXB 1.0 vs. Early Release (EA) version. If you have time, definitively learn 1.0, they are quite different and the main advantage is that the schema combines all the info that you had to formulate in the DTD and in the xjs file when using the EA version. I suggested EA was because you had a DTD already, but in retrospect, you better start from scratch with 1.0. The concepts in 1.0 are here to stay and once your surmounted the learning curve, you'll be glad that you don't have to switch concepts.
When parser job is done,
what kind of Java Object we will get? (String,
InputStream or ...)See above, typically it's an object whose type is defined as a class (and interface in 1.0) within the sources that JABX generates. Or it can be a String or one of the primitive types - you tell the "compiler" in the schema (xjs file in EA) what you want!
2. If we want to use JAXB, we have to contain a
XJS-file? Something like:In EA, yes. In 1.0 no - it's all in the schema.
I am very new to XML, is there any simpler way to get
around them? It has already take me 4 days to find a
simple parser which give it XML and DTD, then return
to me Java objects ... I mean if that kind of parser
exists....It'll take you probably magnitude longer that that to get really familiar with JAXB, but believe me it's worth it. You'll save countless days if not weeks once you'll start developing serious software with it. How long did it take you to learn Java and it's main APIs? You'll either invest the time learning how to use the software others have written, or you invest it writing it yourself. I'll take the former any time. But it's only my opinion...
Jan

Need expert's view on java object convertion

Hello,
I have my aplication on NW AS Java which will call ABAP Web Services on SAP ERP System. For that I am using java proxies for web service call.
The problem is every time what ever change i do, i have to touch my java code to regenerate java proxy which will call ABAP Web Service.
Now, i am planning to use XI in between so that I do everything in XI. At least i don't need to touch my java code in future. From XI, i call ABAP web service using SOAP adapter.
Now, the question is how can i convert my java(proxy) objects in XI. The out object i am sending is very complex, i am using some other objects in the out Object to call ABAP web service.
Do i need to put my objects in File or Database ot Message queue... in order to use them in XI. What is the better option in this case...
Thanks,

Hi Sri,
you're approaching it wrongly. You shouldn't use WSDL from XI.
Instead, do it like this:
1. create data type, message type and a outbound interface containing all the fields you may wanna use (for example, containing all objects that you may have in java).
2. then, create a java proxy for this interface in IB (EJB); you'll have to get the EJB code into NWDS, create the EAR, deploy it in XI and activate the proxy*;
3. from now on, call this EJB from your java code.
Now, in XI part:
4. import ABAP function as RFC;
5. develop a mapping between your outbound interface and the RFC;
Now configure a simple scenario from your outbound interface into the RFC interface. You just need a communication channel for the RFC, no need for it in sender java proxy.
If you choose to use abap proxy in the receiver side, then it's even simpler. Define an inbound interface and use it in your configuration instead of RFC.
Just to make it easier, you could even create 2 interfaces (1 inbound and 1 outbound) for the same data/message types, and define a mapping between them just to decide which fields to map; you could disable the fields you dont need right now in the target message. Just make sure to define the fields you want to disable as optional in the data type, or the abap proxy in receiver side will throw a default exception because of missing mandatory fields.
Regards,
Henrique.
reference for java proxy: http://help.sap.com/saphelp_nw70/helpdata/en/97/7d5e3c754e476ee10000000a11405a/frameset.htm

Java Reflection API problem... Please HELP!

Hi,
I'm writing a Client-Server program set where the Server class receives a Java file, along with some parameters, from the Client class/computer.
The Server class then invokes a certain method from the Java file it received (depending on the parameters received).
My Server program keeps giving me a ClassNotFoundException, and I'm going crazy.. I've been trying to fix it for a long time now... but with no avail.
Here's the Server program.. but I doubt you need to read it all. Please just scroll down to "// The line below is what give me problems:".
package remoterun;
import java.net.*;
import java.io.*;
import java.lang.reflect.*;
* <p>Copyright: Copyright ms2000 (c) 2005</p>
public class Server2 {
    public static void main(String args[]) throws Exception {
        int numParameters;
        int port = 6789;
        boolean isThere = false;
        String className, methodName;
        Object[] parameters;
        ServerSocket welcomeSocket = new ServerSocket(port);
        for (; ; ) {
             * Create a new socket, called connectionSocket, when some client knocks
             * on welcomeSocket. This socket has the same port number. TCP then
             * establishes a direct virtual pipe between the client socket and
             * connectionSocket at the server so the client and server can send bytes
             * to each other over it.
            Socket connectionSocket = welcomeSocket.accept();
            // Get number of parameters
            DataInputStream in = new DataInputStream(new BufferedInputStream(
                    connectionSocket.getInputStream()));
            numParameters = in.readInt();
// Get the parameters for the method to be invoked.
            parameters = new Object[numParameters];
            ObjectInputStream objStream = new ObjectInputStream(
                    connectionSocket.getInputStream());
            for (int i = 0; i < numParameters; i++) {
                parameters[i] = objStream.readObject();
            // read the class
            File program = (File) objStream.readObject();
            System.err.println(program); // It prints the program name correctly, e.g. Class2.java
// Receiving some String parameters...
                        BufferedReader inFromClient = new BufferedReader(new
                    InputStreamReader(connectionSocket.getInputStream()));
            className = inFromClient.readLine();
            methodName = inFromClient.readLine();
            // The line below is what give me problems:
            Class classDefinition = Class.forName("remoterun." + className + ".java");
            Object object = classDefinition.newInstance();
            Method[] theMethods = classDefinition.getMethods();
            for (int i = 0; (i < theMethods.length) && (!isThere); i++) {
                if (theMethods.getName().equals(methodName)) {
isThere = true;
theMethods[i].invoke(object, parameters);
The Client code just sends the stuff to the Server, and it works fine. The code is below if it may help:
package remoterun;
import java.net.*;
import java.io.*;
public class Client2 {
    public static void main(String[] args) throws Exception {
        int result;
        int port = 6789;
        int num1 = 5;
        int num2 = 6;
        int numParameters = 3;
        String hostIP = "127.0.0.1";
        String className = "Class2";
        String methodName = "add";
        Object[] parameters;
        Socket clientSocket = new Socket(InetAddress.getByName(hostIP),
                                         port);
        // Send numParameters, className, methodName
        DataOutputStream out = new DataOutputStream(new BufferedOutputStream(
                clientSocket.getOutputStream()));
        out.writeInt(numParameters);
        out.flush();
        Integer num3 = new Integer(num1);
        Integer num4 = new Integer(num2);
        parameters = new Object[] {num3, num4, InetAddress.getLocalHost()};
        File program = new File((className + ".java"));
        ObjectOutputStream output = new ObjectOutputStream(clientSocket.
                getOutputStream());
        for (int i = 0; i < numParameters; i++) {
            output.writeObject(parameters);
output.writeObject(program);
output.flush();
DataOutputStream outToServer = new DataOutputStream(clientSocket.
getOutputStream());
outToServer.writeBytes(className + '\n');
outToServer.writeBytes(methodName + '\n');
outToServer.flush();
clientSocket.close();
The error I get from the Server class is:
java.lang.ClassNotFoundException: remoterun.Class2.java
at java.net.URLClassLoader$1.run(URLClassLoader.java:199)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:141)
at remoterun.Server2.main(Server2.java:94)
Exception in thread "main"
(I also get a dialog box saying sthg like, "A fatal exception occured.. will exit now".)
It's really odd, becuase there were rare times when it works although I don't change the program...
I tried changing the problem line to stuff like:
            Class classDefinition = Class.forName(className + ".java");or
   Class classDefinition = Class.forName(className);but with no use. Same error. Can someone please pinpoint the problem?
I'm sure the program does get to the Server, because it can print out the file name.
PS: Sometimes it works when I use the same PC as the client/server, sometimes it doesn't.... Help :-(
I'd appreciate some assistance in this.
Thank you.

What's this dot-java stuff? Are you sending a source file? If so, that isn't going to work. You need to compile the file and send the dot-class file.
I'll try that. However, can I make the Client program complie the .java file? For example. something like Class2.compile()? Is this feature available, or do I have to open Class2.java and compile it from there?
And in the server you need to either store that somewhere in the server's classpath....
Isn't it automatically stored there? If not, how do I make it stored in the same file as the Server source file (I assume that's what you mean by classpath)?
Thanks for your help... !!!

Cache distribution - Java object cache

Hi.
I'm trying to use Oracle Java Object Cache (cache.jar), the one included in the 9iAS 9.0.3.
Everything works fine but the cache distribution between different JVM:s.
Anyone got this to work?
Regards
Jesper
package test;
import oracle.ias.cache.*;
* Singleton Cache class.
public class Cache {
     /** The singleton instance of the object. */
     private static Cache instance = null;
     /** The root region. */
     private final static String APP_NAME = "Test";
     * Protected constructor - Use <code>getInstance()</code>.
     * @throws Exception if error
     protected Cache() throws Exception {
          CacheAccess.defineRegion(APP_NAME);
     * Gets the singleton instance.
     * @return The instance of the Cache object.
     public static Cache getInstance() throws Exception {
          if (instance==null) {
               createInstance();
          return instance;
     * Creates the singleton instance in a thread-safe manner.
     synchronized private static void createInstance() throws Exception {
          if (instance==null) {
               instance = new Cache();
     * Put an object on the cache.
     * @param name The object name
     * @param subRegion The sub region
     * @param object The object to cache
     * @throws Exception if error
     public static void put(String name, String subRegion, Object object) throws Exception {
          CacheAccess appAcc = null;
          CacheAccess subAcc = null;
          try {
               appAcc = CacheAccess.getAccess(APP_NAME);
               // Create a group
               Attributes a = new Attributes();
               a.setFlags(Attributes.DISTRIBUTE);
               appAcc.defineSubRegion(subRegion, a);
               subAcc = appAcc.getSubRegion(subRegion);
               if (!subAcc.isPresent(name)) {
                    subAcc.put(name, a, object);
               } else {
                    subAcc.replace(name, object);
          } catch (CacheException ex){
               // handle exception
               System.out.println(ex.toString());
          } finally {
               if (subAcc != null) {
                    subAcc.close();
               if (appAcc != null) {
                    appAcc.close();
     * Gets a cached object from the specified sub region
     * @param name The object name
     * @param subRegion The sub region
     * @return The cached object
     * @throws Exception if requested object not in cache
     public static Object get(String name, String subRegion) throws Exception {
          CacheAccess appAcc = null;
          CacheAccess subAcc = null;
          Object result = null;
          try {
               appAcc = CacheAccess.getAccess(APP_NAME);
               subAcc = appAcc.getSubRegion(subRegion);
               // define an object and set its attributes
               result = (Object)subAcc.get(name);
          } catch (CacheException ex){
               // handle exception
               throw new Exception("Object '" + name + "' not in cache region '" + subAcc.getRegionName() + "'.");
          } finally {
               if (subAcc != null) {
                    subAcc.close();
               if (appAcc != null) {
                    appAcc.close();
          return result;
     * Invalidates all objects in all regions
     public static void invalidateAll() throws Exception {
          CacheAccess appAcc = CacheAccess.getAccess(APP_NAME);
          appAcc.invalidate(); // invalidate all objects
          appAcc.close(); // close the CacheAccess access
     // Main method for testing purposes.
     public static void main(String[] args) throws Exception {
          try {
               System.out.println(">> Caching object OBJ1 into region TEST1.");
               Cache.getInstance().put("OBJ1", "TEST1", "Object cached in TEST1.");
               System.out.println(">> Getting OBJ1 from cache region TEST1.");
               System.out.println(Cache.getInstance().get("OBJ1", "TEST1"));
          } catch (Exception ex) {
               System.out.println(ex.getMessage());
Contents of JAVACACHE.PROPERTIES:
# discoveryAddress is a list of cache servers and ports
discoveryAddress = host1.myserver.com:12345,host2.myserver.com:12345
logFileName = c:\javacache.log
logSeverity = DEBUG
distribute = true

I have same problem
Exist some reason?
I'm testing Cache with isDistributed() method and I still got false!
Thanx

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

Y in java objects are created on heap only and not on stack ??

Hi ,
I need a answer to the question " why all the objects are created on heap only in java and not on stack " ?
In java a object is created when we specify new i.e. for example,
consider the following cases.
1.
Vector v = new Vector();
here object is created and the reference to this object is assigned to variable v. okie.
2.
when i write something like
Vector vec ;
Here i am creating reference variable for Vector. No object is created and no seperate memory is allocated for it. Reference variablesa are stored along with other primitive variables on the java stack.
My question is, in C++ by writing case 2 i can create an object and it is creating this object on stack. So why in java object is not created on stack while i do like this ? Why in java objects are created on heap only ?
If my question is out of interest of this forum i apologize for it. But if somebody can throw some light on it, it would be of great help.
Cheers !!
Dipesh

Hi
I asked this question just to understand how compiler and jvm cud have been designed......i.e. to know the philosophy behind designing language.......
now what i cud surmise is that if objects were to be stored in stack then on calling garbage colllector , it may delete some unused obj and unreferenced object(unreachable object) and this in turn may give rise to non-contagious areas in stack, thus nullifying the garbage collector's objective of freeing the the memory. Again deallocating that intersperse spaces into one free block of space will be bit troublesome task.....
So considering above factor the designer of jvm and java compiler have opted for storing objects on heap rather than stack.....
If u have something to say bout this.......pls go ahead.......
Cheers !!
Dipesh

Y in java objects are created on heap only n not on stack ?

Hi ,
I need a answer to the question " why all the objects are created on heap only in java and not on stack " ?
In java a object is created when we specify new i.e. for example,
consider the following cases.
1.
Vector v = new Vector();
here object is created and the reference to this object is assigned to variable v. okie.
2.
when i write something like
Vector vec ;
Here i am creating reference variable for Vector. No object is created and no seperate memory is allocated for it. Here this reference is placed on the java stack along with other primitive data types.
My question is, in C++ by writing case 2 i can create an object and it is creating this object on stack. So why in java object is not created on stack while i do like this ? Why in java objects are created on heap only ?
If my question is out of interest of this forum i apologize for it. But if somebody can throw some light on it, it would be of great help.
Cheers !!
Dipesh

Cross post!
http://forum.java.sun.com/thread.jsp?forum=32&thread=260589

JNDI NIS object access problem

JNDI NIS object access problem:
Hi all,
After long fight, i'm now able to connect to my NIS server on my network. the initial context factory is 'com.sun.jndi.nis.NISCtxFactory' and provider url are given and i obtain namingennumeration of items in the NIS directory.
purpose of my project:
using ypcat command we can view the services,passwd,host... objects in unix.
my project requirement is that i shd open this 'services' object in java (using JNDI probably) and shd access its content.
i'm able to obtain the object and the type of this object is 'NISCtxServices' defined in 'com.sun.jndi.nis.NISCtxFactory' package, but all the classes and methods except some are not public and so im not able to use almost all the methods in this class 'NISCtxServices' .
Can any one help me in accessing the information inside this object.
Thanks in advance! and i'm waiting!

It's because JFrame does not have a public progessbar variable, only your subclass has that.
//change this
JFrame frame = new ProgressBarDemo();
//to this
ProgressBarDemo frame = new ProgressBarDemo();

Some java object assignment problem

Similar Messages

Maybe you are looking for