A problem with jdk 1.6

when I compile my java files, class file are produced after debbug.
but when i try to run my program (my class with main method ), I get this error message "error on thread main ...." .
so what can I do to run my classes?thanks for the help.
PS: I use command line on windows xp.

Hi,
I have such problem too.
With JRE under Windows.
Applets are executed properly.
But programmes for interpriter java.com
are compiled without errors but
are not work under JRE 1.6.
After:
java.com programme.class,
I get error message:
"Exception in thread "main" java.lang.NoClassDefFoundError: HelloJava/class".
for any programmes. Even for class with empty main function.
Second problem with compiler for Windows:
When source file programme.java
in UTF-8, the first symbol in file is spetial for unicode
files in Windows.
The compiler writes an error message and stops.

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Performance problems with jdk 1.5 on Linux plattform

Performance problems with jdk 1.5 on Linux plattform
(not tested on Windows, might be the same)
After refactoring using the new features from java 1.5 I lost
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public Vector<unit> units;
The new code:
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I expected the opposite.
Is there any information available that helps?

Here's the complete benchmark code I used:package test;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Vector;
public class IterationPerformanceTest {
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          m_size = size;
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               testArray[item] = new Integer(item);
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          long start = System.nanoTime();
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               builder.append(testArray[index]);
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getArrayForEachDuration() {
          Integer[] testArray = new Integer[m_size];
          for (int item = 0; item < m_size; item++) {
               testArray[item] = new Integer(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (Integer item : testArray) {
               builder.append(item);
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getArrayListForLoopDuration() {
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          for (int item = 0; item < m_size; item++) {
               testList.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (int index = 0; index < m_size; index++) {
               builder.append(testList.get(index));
          long end = System.nanoTime();
          System.out.println(builder.length());
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          ArrayList<Integer> testList = new ArrayList<Integer>();
          for (int item = 0; item < m_size; item++) {
               testList.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (Integer item : testList) {
               builder.append(item);
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getArrayListIteratorDuration() {
          ArrayList<Integer> testList = new ArrayList<Integer>();
          for (int item = 0; item < m_size; item++) {
               testList.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          Iterator<Integer> iterator = testList.iterator();
          while(iterator.hasNext()) {
               builder.append(iterator.next());
          long end = System.nanoTime();
          System.out.println(builder.length());
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               testList.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (int index = 0; index < m_size; index++) {
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          LinkedList<Integer> testList = new LinkedList<Integer>();
          for (int item = 0; item < m_size; item++) {
               testList.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (Integer item : testList) {
               builder.append(item);
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getLinkedListIteratorDuration() {
          LinkedList<Integer> testList = new LinkedList<Integer>();
          for (int item = 0; item < m_size; item++) {
               testList.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          Iterator<Integer> iterator = testList.iterator();
          while(iterator.hasNext()) {
               builder.append(iterator.next());
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
     public long getVectorForLoopDuration() {
          Vector<Integer> testVector = new Vector<Integer>();
          for (int item = 0; item < m_size; item++) {
               testVector.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (int index = 0; index < m_size; index++) {
               builder.append(testVector.get(index));
          long end = System.nanoTime();
          System.out.println(builder.length());
          return end - start;
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          Vector<Integer> testVector = new Vector<Integer>();
          for (int item = 0; item < m_size; item++) {
               testVector.add(item);
          StringBuilder builder = new StringBuilder();
          long start = System.nanoTime();
          for (Integer item : testVector) {
               builder.append(item);
          long end = System.nanoTime();
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          return end - start;
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          Vector<Integer> testVector = new Vector<Integer>();
          for (int item = 0; item < m_size; item++) {
               testVector.add(item);
          StringBuilder builder = new StringBuilder();
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Memory problem with jdk/jre 1.1.8

My name is BERGMANN Yannick.
I'm working for IRM in Li?ge and we developped an application (user interface for an industrial measurement system) in Java (JDK/JRE version : 1.1.8).
We have a big memory problem with this application :
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     "jre.exe"     "commit total"     "commit limit"     "commit peak"     "physical total"     "physical available"     "physical file cache"
Monday     92264     109256     194944     109424     130484     19492     6216
Thuesday     106196     123072     194944     123348     130484     6072     5840
Wednesday     110836     132288     194944     132416     130484     4408     5140
Thursday     108200     144980     194944     145140     130484     4888     5148
Friday     109440     158319     194944     161334     130484     4911     4992
Monday     111600     209060     228548     209148     130484     5184     3484
Have you any idea of what is happening with "jrew" in memory ?
We have had this problem for six month and we are totaly out of idea.
If you can give us any idea, we'll appreciate a lot.
Thanks in advance,
BERGMANN Yannick
IRM SA - Software Engineer
Tel. (32)4/239.90.10
Tel. (32)4/239.90.74 (direct)
Fax (32)4/263.40.97
E-mail [email protected]

We had a memory problem with a swing applet in our company. The major reason for this was that we added new components in a JTree and removed them later again, and the components we removed were never garbage collected. This was because with these components we added different listeners, and we didn't remove the listeners after we didn't need the components anymore. After we corrected this, the components where garbage collected.
Perhaps it's a similar problem you have, or I have no idea. Check that you remove actionlisteners, mouselisteners etc from components you want to be garbage collected.
You could also test your application with OptimizeIt to see what objects you create and how many you get of them over time: http://www.vmgear.com

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Thomas

Thanks for reply
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Edited by: user10285639 on Oct 15, 2008 4:47 PM
Edited by: user10285639 on Oct 15, 2008 4:53 PM

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Hello all,
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Greetings

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EP 7.0 Install Problem with JDK path

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saved the file to my desktop as Hello.java
C:\> javac Hello.javaC:\ is not the desktop!
The jdk is installed properly im sure but it can find my compiler.Of course it can! It just can't find the file you are trying to compile, because that's not in the root directory.
I suggest you make a directory C:\java and save your source file there rather than on the desktop. In the command prompt, enter cd \java to make it the current working directory and then enter javac Hello.java.
@Pravin: The question is about compiling, not running. CLASSPATH has nothing to do with this problem.
db

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at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
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Hi, I know that this question has been made many times
but I can't get solve my problem.
I have jdk 1.4.2_03 and I'm using IE 6
All of them are correct.
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^
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Hi, I'm having the same package javax.servlet.http does not exist error. I've been reading past postings on the forum and tried the methods but none of them works.
My code as follows:
package Helpdesk;
import javax.servlet.http.*;
public class SessionCount implements HttpSessionListener
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SessionCount.java:3: package javax.servlet.http does not exist
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^
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location: class Helpdesk.SessionCount
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^
SessionCount.java:9: cannot resolve symbol
symbol : class HttpSessionEvent
location: class Helpdesk.SessionCount
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^
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symbol : class HttpSessionEvent
location: class Helpdesk.SessionCount
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^
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^
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set classpath=C:\Program Files\Apache Group\Tomcat 4.1\webapps\g-megastore\WEB-INF\classes
both servlet.jar and j2ee.jar are in this \classes folder.
What went wrong?

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Under JDK 1.3 it runs under JDK 1.4.1_01 gives it problems.
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javax.swing.JOptionPane.showMessageDialog(null,"","Test",javax.swing.JOptionPane.OK_OPTION);
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The window hangs.
I think it is a bug in the JDK.
I do not find a solution.
Somebody can help me.

First you set focus on the JTextField, then you show a dialog.
This will not work the way you intend.
Turn the order of the statements around and try again.
Also, this is not the recommended way to validate input.
Set an InputVerifier in your text field. That way the field cannot looses focus until the field is valid.

SunJCE TripleDES problem with JDK 1.6

Hello All,
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          try
               // Encode the string into bytes using utf-8
               byte[] utf8 = str.getBytes("UTF8");
               // Encrypt
               byte[] enc = ecipher.doFinal(utf8);
               // Encode bytes to base64 to get a string
               String result = new sun.misc.BASE64Encoder().encode(enc);
               return (result);
          } catch (javax.crypto.BadPaddingException e)
               System.err.println(e.getMessage()+"\n"+Functions.getStackTrace(e));
          } catch (IllegalBlockSizeException e)
               System.err.println(e.getMessage()+"\n"+Functions.getStackTrace(e));
          } catch (UnsupportedEncodingException e)
               System.err.println(e.getMessage()+"\n"+Functions.getStackTrace(e));
          } catch (java.io.IOException e)
               System.err.println(e.getMessage()+"\n"+Functions.getStackTrace(e));
          return null;
     public String decrypt(String str)
          try
               // Decode base64 to get bytes
               byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer((str));
               // Decrypt
               byte[] utf8 = dcipher.doFinal(dec);
               // Convert to a string
               String result = new String(utf8, "UTF8");
               // Decode using utf-8
               return result;
          catch (javax.crypto.BadPaddingException e)
               System.err.println(e.getMessage()+"\n"+Functions.getStackTrace(e));
          catch (IllegalBlockSizeException e)
               System.err.println(e.getMessage()+"\n"+Functions.getStackTrace(e));
          catch (UnsupportedEncodingException e)
               System.err.println(e.getMessage()+"\n"+Functions.getStackTrace(e));
          catch (java.io.IOException e)
               System.err.println(e.getMessage()+"\n"+Functions.getStackTrace(e));
          return null;
}any help woule be appreciated.
thank you
Tyson OSwald

If you explicitly use "PBEWithMD5AndTripleDES"then
it works OK. It is just the method call thatreturns
the wrong string!I'm not sure what you are stating here, I am
explicitly using PBEWithMD5AndTripleDES.No! You are usingecipher =
Cipher.getInstance(key.getAlgorithm());and you should useecipher =
Cipher.getInstance("PBEWithMD5AndTripleDES");or use the 'Alg' constant you have setup.Doh!, I see. It works now, thanks!
>
The problem is that key.getAlgorithm() should return
"PBEWithMD5AndTripleDES" but will return
"PBEWithMD5AndDES".
Message was edited by:
sabre150

Problem with JDK running

I am relatively new to java programming and currently cannot get the
jdk to run. I had the jdk working fine until last week when I reinstalled
vista. I have changed the the environmental variable in the system properties to
Class variable : c:\program files\java\jdk1.6.0_01\bin
and I still get errors when trying to run one my java programs. The
error I get is :
Exception in thread "main" java.lang.NoClassDefFoundError: book
What do I need to do to get java working again. Any help anyone
can provide would be greatly appreciated.

Please be very precise about what you are doing and what you have entered. There is no such thing as "Class Variable" that has anything to do with how Java finds classes.
You need to set or specify the classpath. I recommend against setting it as an environment variable. The classpath is where Java looks for classes. C:\Program Files\Java\jdk1.6.0_01\bin is where Windows looks for the JDK executables, such as javac.exe and java.exe.
You should specify the classpath using the -cp argument of both javac and java.
The classpath needs to point to any directories containing your source code and/or class files, and also to any jar files needed by your application (if any).
The classpath only needs to point to the top of the package hierarchy, if you are using packages for your Java classes (which you should for anything beyond a "Hello World" program).
Finally, you need to be precise about case as well. Java expects a class called book to be in a file called book.class. However, conventionally, Java class names should start with a capital letter.
For example, assuming you have a class Book in a package example and the code for your project is in C:\myproject\src, you would call :javac -cp C:\myproject\src C:\myproject\src\example\Book.javato compile your Book class, and thenjava -cp C:\myprojects\src example.Book to run it.

Font problems with RH 7.1 and JDK 1.3.1

Hi there,
I've read all post about this and looked at sun docs on how to add fonts. I've even replaced the fonts.properties with a new one I got from sun's page, but I can't make jdk 1.3.1 load the correct fonts for JDeveloper.
Could anyone post here the steps to do it?
I've also tried JDK 1.4.1 and for the moment everything works but some wizards, which I must run reverting to 1.3.1 JDK.
Thanks,
Ignacio

To be honest, I managed to solve de problem getting the missing font from a Windows system (Ufffffff!!!!!). Now I don't get any font problems with JDK 1.3.1 but I find it very much slower than 1.4.1, and the problem is that JDeveloper wizards get weird in 1.4.1 and work OK in 1.3.1 ... let's hope Oracle releases a 1.4.1 ready JDeveloper soon.
Thanks for your message.

A problem with jdk 1.6

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