I compiled my first .java file and I made a .class file.....but when i try to run it from the prompt i get this NoClassDefFoundError.I saw in the FAQ that I should set CLASSPATH=, then try again, however I get the same problem.Anyone know what I should do?

I've got this bad problem that's been bugging me all weekend, and I can't work out how to fix it. A few months ago I was able to write classes that use other classes I've defined no problem. I just started using my compiler again, and now when I want to use different classes I've written, ...

Look at Thisimport java.util.*;public class c1 {public static void main(String[] args) {HashMap<String, Object > map1 = new HashMap<String, Object>();HashMap<String, Object > map2 = new HashMap<String, Object>();map1.put("a1 ", "a1");map1.put("a2 ", "a2");map1.put("a3 ", ...

HiI'm trying to compile a piece of code a friend gave me but the compiler gives me an error :package javax.comm does not exist; import javax.com.However, I have already downloaded java communication API and have the following files in the following directories of the jdk1.5.comm.jar is in ...

Hey,I have a problem i can't resolve.When i try to compile anything (even the helloWorld applic), the DOS told me that the javac command is not an internal or external command.The same quetion everybody asks! I've tried reading solutions in various forums but I haven't been able to solve the ...

Can anyone help? when I run the code below, I end up with a NullPointerException. I figured is because I am trying to dooutputstream.write(cmdstring.getBytes()); on line 46.I need help figuring out why it gives me an exception. ThanksDrake01import java.util.*;import javax.comm.*;import ...

Hello!I have been able to open the COM1 port and (i think ) write to it. However I don't quite understand how to receive data from the connected device (when it sends data). I have looked at the simpleread code, but don't understand some of its content. It had certain variables about sizes ...

I downloaded two files. One is j2sdk1.4.2_09, the other is j2me_wireless_toolkit-1_0_4_02. When I created a java file in test editor and wanted to complie it in J2sdk. A Error message is displayed " javax.microedition.midlet" does not exist. I found no microedition java package in it. How to ...

I'm trying to make some very simple applets. I thought I compiled them using the command prompt: javac -source 1.1 *.javaHowever now the same computer does not recognize 1.1 as a valid source. It does recognize 1.2 as a valid source but I need a version before 1.2 as I can view the applets ...

HiI'm trying to compile a piece of code but the compiler gives me an error :package javax.microedition.midlet does not exist; import javax.microedition.midlet.*However, I have already downloaded j2me wireless toolkit-1_0_4_02 and jdk1.4.2

Hi. I'm new to Java. I have a custom class in a package and my main class is in the default unnamed package. Whenever I compile my main class, it doesn't recognize my class, although I've imported the package. After some poking around, I was able to figure out that I need to have the .java ...

Im making a program for my AP Computer Science in school and when i downloaded TxT pad at home and i installed the jdk-1_5_0_04-nb-4_1-win update, the same one we used at school it gives me a problem. Everything compiles fine and when i got to run the application is get the error: Exception in ...

Ok, short question that I hope you can help me with. Is it possible to force the compilation to fail if I a deprecated API is used. Why? Well, we are a large number of developers and sometimes people use a method or class that has been deprecated because they are either lazy or can't find the ...

Hi everyoneI have this piece of code that i am using to open COM1, write, and read from it.Well the problem is I doubt if it actually writes to the port because when i run the program, it opens the port but there is no information to read at the port. I tested the port on hyperterminal and it ...

Hello,I have allways used Jbuilder to compile and run programs but I would like to run from the command line. I have jdk1.5.0_04 and jre1.5.0_04 installed. Whenever I type java or javac at the command line, I get:Microsoft Windows XP [Version 5.1.2600](C) Copyright 1985-2001 Microsoft ...

Hi there,I'm working with a big project that usually takes 45 min to compile which is a long time. I've noticed that the processor load most of the times is only at 50%. So it should be possible to speed this up, right? Does someone have some hints?thanks in advance,Janjava 1.4.2win xp3ghz ...

Hi, I'm a student in Holland, and we just got java and we have to make a camera security system. We have got a CTP unit which is attached to the USB port, but uses a virtual comport (COM10). The CTP is programmed in Pbasic, and that works. We got a .java program for our security system, but it ...

I'm kind of new to Java, but not to programming. This problem confuses me, not because I don't understand what's wrong but because the computer contradicts the obvious solution.I just installed JDK 5.0 that came with J2EE 1.4. A bit of advice from a number of people helped remind me how to ...

[i]Hi new here and never used Java before having to do it as part of my course. I got told to come to this site and download JSE 1.4.2 and then go and download from DrJava the problem I'm having is that i keep getting error msg saying no compiler. Could some one please explain how I go about ...

Hi,I have written a project.it has three packagess model,view,controller.i.e we have folders like C:\exercise1\model\view\controller.and a main file C:\exercise1\mortgagecalculator.when i run the project in eclispe workspace it runs fine but when i run this at command prompt it gives me error ...

I have jdk 1.5.0_05 installed and i created a program called "Test1.java" .I saved the program in C:\Program Files\Java\jdk1.5.0_05\binand the class is created as well in the bin as "Test1.class" .From the command prompt, I have the path C:\Program Files\Java\jdk1.5.0_05\bin>I am able to ...

I tried compiling a program that instantiates an object of another class from a separate .java file. However, both .java files are in the same directory. I've never encountered this problem before, and I know some path variable must be wrong somewhere but I don't where. I also tried added a ...

Does anyone have ideas on how to compile large systems? Currently I am using gnu make/makefiles executed via a Unix script. Is there an easier better way than to clean, execute, and run a depend option on 100 makefiles?

I have developed a Socket Programing using Netbeans IDE on windows environment. Now i want to port the Class files on Tandem which is unix like OS.But i am getting ClassFormatException and unable to bind the libraries like log4j. Can anybody help me in Configuration of classpath for lib on ...

hello,i hav a problem while i run a javac command at the command prompt.my operating system is windows 2000 server family. jdk1.4.0 has being installed .i hav tried using set class path command ieset CLASSPATH=c:/program files/jdk1.4.0/bin after this when i give javac at the command prompt it ...

Hi I honestly need help.I have this piece of code that i am using to open COM1, write, and read from it.Well the problem is I doubt if it actually writes to the port because when i run the program, I don't pick up any activity at the port. It says the port is open but when I write to it, I get ...

Hi is there any way to use conditional compilation in such a way that in the true condition i have compilable code and in the false condition i have a code which is not compilable at this moment so that the compiler just ignores it completely (Like in C/C++) and not give any compile time ...

Hi,I'm working on a small database project and I'd like to use it as an application outside of eclipse. Since it may be too difficult for me to create an executable jar file (it didn't work), I wanted to compile and run it manually from the command prompt. Compiling works withjavac ...

hi ppl,i have installed jre-1_5_0_04-windows-i586-p-iftw . but i am not able to compile any java program. when i try to compile javaw it is generating an error " could not find the main class : program will exit ".pls help me to figure out what went wrong.pls i need a reply ...

I have the same problem as many other people have experienced involving javac not being recognized in command prompt. I have tried everything that i am aware of to solve it. advice please - i am running XP, JDK1.5

Hi hero's,My application uses plain java, rmi, and jni. In order to compile this in a decent way, i want to create a compile script. Now I have created an ant build file, but with ant i cannot compile c++ code. So therefore i created a dos-script that calls for ANT in order to compile the java ...

I'm trying to run javac 1.5.0 in Cygwin but it seems to ignore the classpath I pass in,so I get "package does not exist" error. Any ideas?Here's my command:/cygdrive/c/Program\ Files/java/jdk1.5.0_04/bin/javac \-verbose \-d classes \-classpath .://filer/home/doog/src/adsenseapi/google3/java ...

Hi I've installed the javax.comm. When I'm compiling I get the following error The import javax.comm cannot be resolvedCan anyone tell me what is wrong - or give some hints?/lars

Hi Pls help me!my java coding is in the following:package mypack;import java.util.Date;public class UserSession{private boolean isLogin=false;private String userId;private Date lastLoginTime;private int logCount;public void setIsLogin(boolean 1){this.isLogin=1;}public void setUserId(String ...

I just complied something with no problems in Eclipse 3.2M2. I tried to compile using javac 1.5.0_04, and I get:[javac] An exception has occurred in the compiler (1.5.0_04). Please file a bug at the Java Developer Connection ( http://java.sun.com/webapps/bugreport) after checking the Bug Parade ...

Hi,I am using MAC OSX 10.4 (imac G5).I am trying to load a JNI library libxxx.jnilib through an applet.The code is as follows...System.loadLibrary("xxx");I compiled, created jar & signed the same. I have placed the libxxx.jnilib in the /Library/Java/Extensions/ also set DYLD_LIBRARY_PATH to ...

Have a developer on my team seeing this issue. It has repeated multiple times in his environment, but none of my other developers are having this issue. Could this be an environment issue or is it a bug? I have not found any other posts or bug with this same java.lang.NullPointerException at ...

I have had troubles with getting messages such as:C:\Java>java TemperatureException in thread "main" java.lang.NoClassDefFoundError: TemperatureI have found that using the following code I can type in java TemperatureC:\Java>set classpath=%classpath%;.;The only other way I have found to ...

I have read some the the posts but am unable at current to find an acceptable answer. I have recently downloaded the JDK1.5.0_05 version but I cannot compile anything. I have tried to set the path variable but it say i cannot. I am at a loss for what to do to compile the programs. Any specific ...

Exception in thread "main" java.lang.NoClassDefFoundError: VierOpEenRijI can Compile my file VierOpEenRij.java , then it creates his .class but when I try to open it ( java VierOpEenRij ) then it says this error.anyone has an Idea how come , cause I really need it for school ...

I wrote some very simple programs for image viewing with flickrj and other external libraries. But I don't know what would I do to make it run on other people's computers ( only with JRE installed, I can run it only because I have eclipse, can't even get it to work under windows command ...

I have little but far from none experience with java. Today I had thise problem with running a jar file.While copiling my java source file, i referred to a library jar file, this gave no problems for compiling.but when i wanted to run the jar file from DOS. It gave me the NoClassDefFoundError ...

I need to know how to compile all java files in folder which has many folder with java filesEg-A -- | --Bb1.java |--Cc1.javaHow to compile all java files inside A folder in DOS

I would like to know if it磗 possible to compile a .java file of source code on a pocket pc as I can do on a desk pc,thanks,

Hi all;I am new to the ant and I used following java example and it worked, when I used it with ant. package oata;public class HelloWorld{public static void main(String[] args){System.out.println("Hello Ant");}}Build file is <project><target name="clean"><delete ...

I have WinXP and I have problems stting the Classpath.When I try to run the HelloWorld it shows this message:exception in thread "main" Java.lang.NoclassDeFfounderror: HelloWorld/classThanks for the help!! XD

Received the following errors.Product.java:3: Product is not abstract and does not override abstract method getDisplayText() in Displayablepublic class Product implements Displayable^Product.java:16: getDisplayText() in Product cannot implement getDisplayText() in Displayable; attempting to use ...

i am able to compile but not run ;from the c:\tally becoz the classpath might havent set how to set class path in windows Xp helpregardsanbu

Shalom,I new in this Java thing and am using exlipse to code.I was wondering... could abyone post a simple howto compile mycode into an exe file with eclipe.Thanks in advanced,Avihai.O

Helli FriendsI'n installed JDK1.2 on my computer(because of the big size of the newest jdk I can't download the latest version). And my OS is Win XP SP2. Installing will be finished completely and successfully. But the problem is that when I run JAVAC to compile my written codes, I get this ...