Class files problem

Hi All,
I am getting a problem in Eclipse.
Suddenly i am not able to generate the class files in the Eclipse.
I have checked my build path,removed the jar files and then
again added.
But still i am not able to generate the class files.
Please help

yes i have unchecked the build
automatically..........
i normally right click on the nabigator view and
then
click bulid project......please help on what i am
missingAnd that's suddenly stopped working? How do you know?

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RMI class file problem

I have already write a RMI example for self-study successfully, but there are a little class file problem that I'm not able fix it.
In my RMI example there are 3 .java files (RMIServer.java, RMIClient.java and a MethodImpl.java)
After I have javac and rmic them, I got RMIServer_Skel.class, RMIServer_Stub.class, RMIClient.class and the MethodImpl.class
In order to run the RMI in a local envirnment, I divide them into 2 folders as listed below:
Server - RMIServer_Skel.class, RMIServer_Stub.class and the MethodImpl.class
Client - RMIServer_Stub.class, RMIClient.class and the MethodImpl.class
Then when I start to run them in a DOC envirnment...
start rmiregistry........(run successful and another rmiregistry DOC window created)
java RMIServer.........Exception in thread "main" java.lang.NoClassDefFoundError: RMIServer
Oops? Class not found? How can that be? And after that, I tried something.......to add the RMIServer.class into the Server folder.
Again, I start to run them in a DOC envirnment...
start rmiregistry........(run successful and another rmiregistry DOC window created)
java RMIServer.........The server is instantiated(run successful and print out a String)
Um...is the RMI have to run with a RMIServer.class file? But the RMI notes I refered from is not seems to be telling me to do this, are there any one can give me a helping hand?

please, go here, read thoroughly
http://java.sun.com/docs/books/tutorial/getStarted/cupojava/index.html

Class file problem

i use JCreator LE my java file compiles and run well.......but if I try to run the class file through command prompt it gives an exception as follows......if I build class file using netbeans it works in command prompt
Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version n
umber in .class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)Any idea how to solve this problem??
thanks

Thanks now it doesn't give the exception java.lang.UnsupportedClassVersionError in command prompt.
This time I am facing some different problem
I made a program about file searching.....when I run this program(to search files in hardisk) in JCreator LE no exception is shown. But when I run this using command prompt at one stage it gives an java.lang.NullPointerException. I dont think there is a problem with the code.
Any help will be appreciable.
java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Client VM (build 1.6.0-b105, mixed mode, sharing)
Classpath is same for JCreator LE and command prompt

Automatic copying of class file problem

I am using Weblogic 4.5.1 server on NT.
          I have a JSP "main.jsp" in which I am importing a user defined class
          "com.vt.Attribute".
          The Jsp is getting compiled into a servlet in
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          Regards.


Remove the package statement in your source code.
          I think this could be the cause.
          Chandra
          "Raghav" <[email protected]> wrote in message
          news:[email protected]..
          > I am using Weblogic 4.5.1 server on NT.
          > I have a JSP "main.jsp" in which I am importing a user defined class
          > "com.vt.Attribute".
          >
          > The Jsp is getting compiled into a servlet in
          > "weblogic\myserver\classfiles\jsp_servlet\_jsp" directory. Also the file
          > "Attribute.class" is getting placed automatically in directory
          > "weblogic\myserver\classfiles\com\vt". Because of this, I am getting a
          > ClassCastException, since the serial ids of the two class files will be
          > different.
          >
          > How can I prevent the automatic copying of the "Attribute.class" into
          > "weblogic\myserver\classfiles\com\vt" directory.
          >
          > Regards.
          >
          >

Problem with applet , Not able to detect class file

Hello friends,
I have a swing/applet class file, and i am trying to integrate it with Tomcat webapps
My HTMl code goes like this...........
<APPLET ALIGN="CENTER"
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               WIDTH="800" HEIGHT="500">
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My classes are found inside the code base URL............
CODEBASE="/../../classes/org/jgraph/"
My folder structure is like below.....in which "SimpleGraph.class" is found
D:\June5WF\Archicentro\web\WEB-INF\classes\org\jgraph\SimpleGraph.class
My HTML resides in the following directory structure...
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But When I run the JSP page .... I am Getting Class not found exception..........
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I have spent 4 hrs in this......PLZ help me out.....

Hi,
I did not mean file object. I meant workbook object. The problem is that I can not see from your code how do you get that OLE object reference. It should be something like this
GET PROPERTY OF h_excel 'ActiveWorkbook' = h_workbook.
CALL METHOD OF h_workbook 'SAVEAS' EXPORTING #1 = l_file
Regards

Problem in finding java class file

I am writting an application using servlets , JSP and a simple java classfile. The simple java class file is for connection pool and the name of connection pool class is DBConnectionManager . I am using JavaWebserver2.0 and I have placed this class file in .\JavaWebserver2.0\classes
I am placing my servlets in .\JavaWebserver2.0\servlets folder. Since I am using wfm package so my servlets are placed in .\JavaWebserver2.0\servlets\wfm .
The problem is with compiling the servlet placed in wfm folder . I get the following error:-
TestServlet.java:11:cannot resolve symbol
symbol: class DBConnectionManager
location: class wfm.TestServlet
However when I try to compile this class in servlets folder and remove the package statement from the source file, it compiles and works very fine. I am having lot of confusion as the class DBConnectionManager is in classpath but even then compiler gives error. The same class when placed in servlets folder and package statement is removed works very fine.
Kindly help.

Hi,
Is the DBConnectionManager class declared public?
Does the TestServlet import the package that contains the DBConnectionManager?
This is all I can come up with, with the current information.
Cheers,
--Arnout

Javac probleme: bad class file error

I'm new to java
I have two classes myPoint.jav and TestPoint.java, when I compile them, I error:
in the command line I type:
C:\otman\java>javac -g geometry\src\myPoint.java TestPoint.java
TestPoint.java:8: cannot access myPoint
bad class file: c:\otman\java\geometry\src\myPoint.class
class file contains wrong class: geometry.src.myPoint
Please remove or make sure it appears in the correct subdirectory of the classpa
th.
myPoint p = new myPoint();
^
1 error
Can some one help me Thanks
//Here is the class c:\otman\java\TestPoint.java
import geometry.src.*;
     Testing my class Point
public class TestPoint {
public static void main(String[] args) {
          myPoint p = new myPoint();
          System.out.println("thank you very much");
          System.exit(0);
// And here is the class c:\otman\java\geometry\src\myPoint.java
package geometry.src;
     class myPoint members and methods of a 3D point
public class myPoint {
     private double m_x,m_y,m_z;          // the coordinates
     public double getx() {return m_x;}
     public double gety() {return m_y;}
     public double getz() {return m_z;}
     public void setx(double x) {m_x=x;}
     public void sety(double y) {m_y=y;}
     public void setz(double z) {m_z=z;}
     public void translate(double dx,double dy, double dz) {
          m_x += dx;m_y += dy;m_z += dz;
     // Constructor ------------------------------------------------------------
     myPoint(double x,double y,double z) {
          m_x=x;m_y=y;m_z=z;
     myPoint() {
          m_x=0;m_y=0;m_z=0;
     myPoint(myPoint p) {
          m_x=p.getx();m_y=p.gety();m_z=p.getz();
// ---------------------------------------------------------------------------------

Thank you for the reply but still have problem.
I created a directory classes and the directories look like:
C:\otman\java\
TestPoint.java
classes\
geometry\
src\
myPoint.java
When I compile using the line command:
C:\otman\java>javac -g -d classes geometry\src\myPoint.java TestPoint.java
I get the error:
TestPoint.java:8: cannot find symbol
symbol : constructor myPoint()
location: class geometry.src.myPoint
myPoint p = new myPoint();
^
1 error
Now the directories look like:
C:\otman\java\
TestPoint.java
classes\
geometry\
src\
myPoint.class
geometry\
src\
myPoint.java
I think that myPoint was compiled without problem but TestPoint was not compiled and it gives 1 error.
Can you help me? Thanks.

Multiple palette files in a library/class file causes problems

While developing a labview class, I wanted to set the default palette, so I added the relevant dir.mnu file to the class. Unfortunately, the class already had a dir.mnu file in it. On adding the file, I got some error message about a dependency change*(which makes no sesne, how can a palette file have any dependencies !). On saving the class and then attempting to reopen it, LabVIEW claims it is corrupt. Inspecting the xml .lvclass files reveals that when I added the new paletee file, LabVIEW actually just added a second reference to the palette file already in the project, which it then considers to be a problem when it tries loading the class. This is clearly a bug on a number of levels:
It should not be possible for the user to induce LabVIEW to create corrupt xml files through such simple attempts to use documented features.
The underlying problem is that LabVIEW appears to be using the conventional search/linking rules to load library items irrespective of whether they are a vi (which should ahve a unique name) or other file (which might well be legitimately non-unique).
Given the near impossibility of renaming a palette file without breaking palette links this particular bug is extra annoying.
Gavin Burnell
Condensed Matter Physics Group, University of Leeds, UK
http://www.stoner.leeds.ac.uk/
Solved!
Go to Solution.

Sorry for the delay, it took me a little longer to reproduce the problem systematically. Attached are three zip files of the same trivial class. The only difference between them is the contents of the class file itself.
The key point is that I have two folders in my class - Public and Protected (although I haven't actually set the access scope I realise). Each folder has a dir.mnu file in it and there is also a dir.mnu file in the main class folder. The class virtual folder structure maps directly to the on disc version.
In the first zip file the dir.mnu files are not added to the class.
In the second zip dile I added the dir.mnu by right clicking and doing Add file... This is allowed because each dir.mnu has a distinct path. I then save the class file and close it.
To get the third zip file, I reopen the class file. I get a single dependency warning about dir.mnu in one of the sub folders. So I think "fine ok, somethign funny about that dir.mnu file" - note if I'm loading a whole heirarchy of classes I may be told LabVIEW is laoding the dir.mnu file from somewhere completely different in my class structure. I then save the class file to give the thrid zip file.
The lvclass file in the third zip file is corrupt because it has multiple entries for the same file, because it didn't handle having more than 2 items conflicting.
The correct behaviour would be not to invoke the conflicting item names for non vi/ctl document types. I could imagine that there would be similar problems if I had a say a whole range of say README.html files strewn over the place.
Gavin Burnell
Condensed Matter Physics Group, University of Leeds, UK
http://www.stoner.leeds.ac.uk/
Attachments:
Break Class File-1.zip ‏21 KB
Break Class File-2.zip ‏21 KB
Break Class File-3.zip ‏21 KB

Problems uploading class files to web server

Regular class files upload fine(to yahoo geocities) but when I try to upload multiple class files of the same instance(ex: MyProg.class, MyProg1$.class, MyProg1$2.class) the ones with the $ symbols wont upload therefore rendering my applet on my website useless. I can change the name and then upload it, but when I go to rename it within the site, I get an "invalid file name" error. I just want my applets to run on my web page so that people can play with them.
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AOL is the same. Note that the xxx$.class files relate to inner classes and you can solve your problem by removing them and creating seperate classes for these.

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Currently iPlanet is not allowing us to hot deploy a modified class file(i.e., servlet) as it advertises. It doesn't seem to have a problem with jsp's however. But everytime we modify a servlet(say in an emergency), and wish to deploy, we still have to bounce the KJS. We would like to avoid this if possible. How? I heard this might be a known issue in iPlanet.

I apologize but this is a clarification of this problem. We are having a problem dynamically reloading java classes that are referenced by jsp's and servlets. The problem DOES NOT exist when trying to reload jsps or servlets themselves. We would like to reload these classes without having to restart the processes. Any thoughts would be helpful. Thanks.

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Hi, im new to java and I have a very simple .java file that I compiled into a .class file. The problem is, then I try and interprit it (Im using JDK 5) I get an error... "Exception in thread "main" java.lang.NoClassDefFoundError: Saluton"
Saluton is my program. I've tried setting the "Path" and "classpath" variables, but it still doesnt work.
Heres my path and classpath variable values.
Classpath:
,;C:\Program Files\Java\jdk1.5.0_05\bin\javaPath:
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You need to add the path to where your compiled .class file is to your system CLASSPATH. For example, if I create class X in package "pak1" then I will run it with:
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Problems on zipping and unzipping class files

I am trying to add a class file to a new jar file using FileInputStream and JarOutputStream.
I am getting a very unique problems.
when I read a class file using FileInputStream from my local hard disk I am getting 30 bytes less than then actual file size (the difference in bytes is exactly 30 bytes for any file, either class or xml or java, I dont understand this concept). after reading the contents I am writing the bytes read to a jar file using JarOutputStream. This all gets done fine. But when I extract the class file written into the jar file and try to run the class it is giving me the exception as follows:
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at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
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at java.net.URLClassLoader$1.run(Unknown Source)
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at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
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at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
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any information or solutions regarding this would be of great help.

A "magic number" is a short sequence of data at the beginning of a file used to identify the file. ".class" files, for instance, always start with OxCA, 0xFE, 0xBA and 0xBE.
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When I am runnig the same site with the same class file on my PC everything is ok.
I would be greatfull for any help. Thx. (sorry for my English :P )

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Problem with variable in class file.

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Ok. Sorry
Here is the main code
import java.io.*;
import java.util.StringTokenizer;
public class LabAssign1
public static void main(String[] args) throws IOException
final int TOKENS_PER_LINE = 3;
String fileName = "labassign1.txt";
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I downloaded the java SE Development kit (JDK 6) with Java FX SDK and used the download manager from Java web site, the program downloaded the
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Kind regards pete

petefizz wrote:
I then created a Java source file which was HelloWorldApp.java. and typed in the Hello World Code as requested I saved it to
C\Documents and Settings\Compaq_owner\Java.Then the full path to your HelloWorldApp.java file is: C\Documents and Settings\Compaq_owner\Java\HelloWorldApp.java.
Then I try to compile my source file into a .class file and get stuck as I am told to open a command window which I do through, start\allprograms\accessories\command promt.
My command window says C:\Documents and Setting\Compaq_Owner>
I am told to compile my source file and I must change my directory in the command window to the directory where my file is located. You file is located in the directory, C\Documents and Settings\Compaq_owner\Java
I type after the existing promt, cd C:\java and also tried, cd C:\Documents and Settings\Compaq_Owner\Java\HelloWorldApp. And was told both times the system cannot find the path specifiedcd stands for Change Directory. You want to change to the directory where your .java file is. You can not use a path that ends in a file because a file is not a directory.
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Class files problem

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