Running the java compiler

I have a problem running programs from the DOS prompt. When I type the command javac Welcome.java, everything runs okay. I can view the file Welcome.class. But when I type the command java Welcome, I get the following error message: Exception in thread "main" java.lang.NoClassDefFoundError: Welcome.
Someone earlier suggested using Class Path to make sure the compiler is using the correct path. This did not make a difference. So I am stuck.

Oh, my God!!! You are a lifesaver. That worked. I thought when someone suggested that earlier that I had tried every combination possible, but it never worked. That did the trick!!! Thanks again!!!

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Run time java compiler

Last year I researched oracle spatial technology and created prototype using oracle 9i, standalone oc4j. In order to start oc4j, i had to download java 1.4.2 from sun site. everything worked fine.
Now I am expanding on the prototype on different machine but am using oracle 10g. I followed the same steps (installed 10g, oc4j, downloaded j2se 1.4.2 and installed). When I start oc4j by following command
java -jar oc4j.jar, I get
error message stating Error loading package at file:/E:/oracle_downloads/oc4j/j2ee/home/applications/admin_ejb.jar, javac.exe no
t found under F:\oracle\product\10.1.0\db_1\jre\1.4.2, please use a valid jdk or
specify the location of your java compiler in server.xml using the <java-compil
er .../> tag.
I am not sure how do I specify location of java compiler in server.xml file sysntactically. I do not not recall this step with oracle 9i.
I edited server.xml and http-wev-site.xml as per instructions in my spatial class for mapviewer application but I need help on how to enter the location of java compiler file in server.xml file.
Thank you

You cannot use the JRE java to start oc4j. Must install a complete 1.4.2 J2SDK (not JRE) then use the java binary under its bin directory to start oc4j (not the one under jre/bin directory).
lj

Is it possible to run the java program without main?

Hi,
Is it possible to run the java program without main?
if anybody know please tell me, how it is possible.
Regards,
Ramya

Hi,
Is it possible to run the java program without main?
if anybody know please tell me, how it is possible.
Regards,
RamyaWhy do you ask? It sounds like an odd question. Your program can be an applet and it doesn't need a main method in that case.
Kaj

Getting an error msg while trying to run the java class from CMC

Hi All,
I am getting an error, while trying to run the java .class file, that which is imoported into CMC.
Error msg:
Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file
     at java.lang.ClassLoader.defineClass1(Native Method)
     at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
     at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
     at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
     at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
     at com.crystaldecisions.sdk.plugin.desktop.program.internal.ProgramWrapper.main(ProgramWrapper.java:49)
I have imported .class file into CMC and trying to invoke the .class file by another java program from eclipse..When i tried to invoke the .class in cmc, i am getting an error msg, mentioned above. I thought there might be version conflict. So i changed the java complier version to 1.5 in my Eclipse. After that is done again i am facing the same problem.
Can anyone help me to resolve this issue?
Thanks in Advance.

i have installed BO SDK 3.1 , Service pack 3. It comes woth JDK 1.5 version. i have not done any chnages to it. I impoprted all the jar files related to BO into eclipse.
1) Actually, i am writing java code on eclipse. When i run code from the eclipse, it creates a session to cmc and creates folder structure what i need.
2) But the thing is, that code needs to run, when i import the .class file into cmc. The process how i imported the .class file to cmc.
Manage> Add> Program File-->Java (Check Box). In this way i added java class file from the eclipse workspace (class file from the bin directory).
3) So when i run the .class file externally by another java program or also when i log in to CMC and run that .class file, the instance shows sucess, but when i see the logfile i am getting an exception that which i mentioned above.
If my method is worng can you please let me know the stepts how to run java program in cmc.
Thanks in Advance

Why the constructor of the base class calls first when u run the java app.

why the constructor of the base class calls first when u run the java application

For the record the other very exciting questions are:
pls give the differences between application server and web server with examples
will u pls narrate the differences between servlet context and servlet config.....
where can we find servlet config...
is there any methods to access servlet config

I am not able to run the java Program

Hi All,
I am not able to run a java program... I am able to complie the program sucessfully when i am trying to run it i am getting a error:
Exception in thread "main" java.lang.NoClassFoundError : filename
i have complie and run my programs frequently but now i am not able run my prevoius examples also ...
Can u any body help me out...... I have also update the latest version of JRE but still my problem is not sloved.
Thanks & Regards,
Ravi

Make sure you take package structure into account.
If you have say
package testing.things;
public class Test
public static void main(String[] args)
System.out.println("World Hello");
}in file Test.java, you compile it with (assuming your current working directory is at the folder in which the source file is located).
javac -d . Test.javaand run it with
java testing.things.TestThe -d . option creates the output at the current directory (with a folder structure matching your package structure).
#

Am not able to run the java program - pls help

1. I installed java in the below path
     c:\program files\java\jdk1.5.0
     c:\program files\java\jre1.5.0
I set the path in
     User variable i. variable name: path
          ii. variable value: c:\program files\java\jdk1.5.0\bin
when I compile it in command prompt-applying javac ? it performed successfully-shows
options like ?g create all debug info, -g : new Generate no debug info etc.,
But am not able to run the file. It shows error msg.
2. I specified the same name for file name & class name.
3. Java <class name>
     Exception in thread ?main?java.lang.NoclassDeffoundError: <class name>
4. Java ?cp <class name>
     Unrecognized option: -cp.<classname>
     Could not create the Java Virtual Machine
5. Java ?classpath . <classname>
     Exception in thread ?main?.java.lang.unsupported classversionError: <classname>
     <unsupported major.minor version 49.0
          at java.lang.classloader.defineclass0<native method>
          at java.lang.classloader.defineclass<unknown source>
               --and many listed below?
6. Java ?classpath c:\program files\java\jdk1.5.0\bin <class name>
     Exception in thread ?main?java.lang.NoclassDeffoundError: <class name>
7. I re-installed the java, but still the problem continuing.
pls help... its very urgent

Is the java class you compiled/calling in the default package? If it is not, you will have to call it by the fully qualified name.
e.g.
package com.mycompany.myproject;
public class MyClass {
    public static void main(String[] args) { }
}This would be called as "Java com.mycompany.myproject.MyClass" and must contain a main method with signature as above.
You would have to call this from folder where the compiled classes are located. If using package, you would call from directory at level of top most package so com folder in this example as Java will look at each package name in qualified name and try to traverse directories with those same names to get to .class file matching class name specified. To avoid this, your newly compiled .class files must also be in your classpath.
Hopefully that helps.
--Kevin

Did anyone try to upgrade the java compiler to jdk1.4?

Hi All,
Maybe I'm just too hurry to try new things off. With only changing the compiler
to version 1.4.0 I got the attached error message. It would very kind of you to
give me advices.
Thanks,
YH

JDK 1.4 is not yet supported with WLS 6.1.
YH Cheng wrote:
The error message returned from startWebLogic.sh
LD_LIBRARY_PATH=/local/ldap/bea/wlserver6.1/lib/solaris:/local/ldap/bea/wlserver6.1/lib/solaris/oci816_8
java.lang.SecurityException: Unable to locate a login configuration
at com.sun.security.auth.login.ConfigFile.<init>(ConfigFile.java:97)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
at java.lang.Class.newInstance0(Class.java:296)
at java.lang.Class.newInstance(Class.java:249)
at javax.security.auth.login.Configuration$3.run(Configuration.java:221)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.login.Configuration.getConfiguration(Configuration.java:215)
at javax.security.auth.login.LoginContext$1.run(LoginContext.java:170)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.login.LoginContext.init(LoginContext.java:167)
at javax.security.auth.login.LoginContext.<init>(LoginContext.java:393)
at weblogic.security.internal.ServerAuthenticate.main(ServerAuthenticate.java:81)
at weblogic.t3.srvr.T3Srvr.run(T3Srvr.java:200)
at weblogic.Server.main(Server.java:35)
Caused by: java.io.IOException: Unable to locate a login configuration
at com.sun.security.auth.login.ConfigFile.init(ConfigFile.java:206)
at com.sun.security.auth.login.ConfigFile.<init>(ConfigFile.java:95)--
Rajesh Mirchandani
Developer Relations Engineer
BEA Support

Invoking the java compiler from programs

HI, I'm a high school java student in the AP Java course. A project that I have been interested in for a while is making a simple IDE, but to do this I need to compile and run programs from within my program.
What I have tried:
The method Compiler.compileClasses("name of file i wanted to compile");
The method System.loadLibrary(System.getProperty("java.compiler"));
The JavaCompiler class in javax.tools. this is my source code.
import javax.tools.*;
public class CompileTest
     public static void main(String[] args)
          String fileToCompile ="Test.java";
          JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
          int compilationResult =     compiler.run(null, null, null, fileToCompile);
          if(compilationResult == 0)
               System.out.println("Compilation is successful");
          else
               System.out.println("Compilation Failed");
After this threw NullPointerExceptions I put the line System.out.println(ToolProvider.getSystemJavaCompiler()); and the output was null.
Any help would be appreciated.
Also, if anyone knows how to run the subsequent class file, that would also be a big help

To run the program, load the class file with a classloader, which will give you a Class object. You then use reflection to find the public static void main(String[] args) Method object, then use Method's invoke method to call main.
You should deal with any exceptions from the program so that it doesn't break your IDE.
It would probably be a good idea to run the program in its own classloader which you could trash after it finishes running so you don't leave resources hanging around.
And finally you probably need to deal with the case where the program calls System.exit(). That could be tricky. (translation, I haven't the foggiest idea how to handle it but I'm sure its possible).
Also there is the issue of background threads (non daemon and daemon) running after main completes. What ya gonna do?
Runtime.exec() is looking mighty attractive right now.
Bruce

Running the Java Card 2.1.2 Development on win98

Hi,
I just installed the Java Card(TM) Development Kit Version 2.1.2 on my windows 98 OS with jdk 1.3.1.
I set all the Environment Variables for Windows.
I also compiled the demos, but I'm unable to run the apdutool. I get a "Bad command or file name".
I read in the readme file that one of the Supported Platforms is Windows NT 4.0 , but it doesn't say windows 98, can this be my problem ? do I have to reinstall my computer with window NT to develop a java card applet ? can I use windows 2000 ?

Hello.No, there is no need to test this toolkit under Windows 2000.It supposed that this packages is working under Windows 98.
I think the problem is that you did not set right the PATH and CLASSPATH of the JC 2.1.2 in the autoexec.Try the followings(see if it is working):
///PATH
set PATH=c:\jc212\bin;%PATH%
if the jc212 is the directory that you installed this package.
///CLASSPATH
set CLASSPATH=%CLASSPATH%;C:\jc212\lib\api21.jar
set CLASSPATH=%CLASSPATH%;c:\jc212\lib\converter.jar
If you still have problems try to add te following line in the autoexec.bat
set CLASSPATH=%CLASSPATH%;c:\jc212\samples
I think this will help you.

To run the java application without jdk package

i would like to know whether possible to make the java .class file as .exe file to run in window environment without the help of jdk package.....if the answer is yes,,,,,is it going to use the jvm???is it come together with window os or not and start from which windows version?? or do we need to use the jre??? actually i would like to make installation package to install an application in windowsxp....i know how to do that one in vb and i've done that one before using visual studio 6.0.....is there any possible way....but please explain in easy words and way coz i might not understand if too technical...nobody can help me in my college,,,even lecturers.....thanks a lot

i would like to know whether possible to make the java .class file as >>.exe file to run in window environment without the help of jdk >>package.....Yes it is possible, there are many tools like one mentioned above to convert your java .class program to .exe and you dont need jdk for that, though you will need JVM
if the answer is yes,,,,,is it going to use the jvm???Yes it needs a JVM
is it come together with window os or not and start from which windows >>version?? You need some tool like PJ2Exe or one mentioned above to convert it to .exe, it wont be available with OS.
or do we need to use the jre???Yes you will need to install JRE for the JVM
actually i would like to make installation package to install an >>application in windowsxp....i know how to do that one in vb and i've >>done that one before using visual studio 6.0.....is there any possible >>way....Yes it is possible,
Make a .exe of your application and using VB make a setup file which takes care of installing JRE as well as your application.
Regards
Rohan

Not able to run the Java Program from jre for the ARM processor

Hi ,
I am try to run the jre1.4.2 for the arm core (linux 2.6kernel) which i downloaded from the sun site.
I am created the class file from the J2SE1.4 development kit. I created the simple HelloWorld Program and complied with J2Se then i copied that class file into my IMX board which has ARM core.
When i run the commnd java HelloWorld i am getting this error
dl failure on line 765Error: failed /dev/shm/jvm/j2re1.4.2/lib/arm/client/libjve
Please give me some suggestion to solve this porblem
Thanks in Advance
Narendra

I JRE i have download from the sun site . But when i am trying to run the simple helloWorld program in that it is giving the below error.
error:
dl failure on line 765Error: failed /dev/shm/jvm/j2re1.4.2/lib/arm/client/libjvm.so because /dev/shm/jvm/j2re1.4.2/lib/arm/client/libjvm.so: symbol __divdf3, version GCC_3.0 not defined in file libgcc_s.so.1 with link time reference.
Can anybody help me in this how to solve this problem . I also searched in the forum but did not get any answer on that problem
Thanks in advance.
Narendra

NoClassFoundError exception while running the java program

Hi,
I am getting the following exception while running a java program CSTToGMTToSQL.java
Exception in thread "main" java.lang.NoClassDefFoundError: CSTToGMTToSQL
However, the class file is getting created for this program in the same directory where the program is residing.
Any idea on this ?
Regards
Ramesh

I know that in the past there was an issue with running a particular version of the SDK on a particular version of windows. The resulant error was a ClassNotFoundException. I am not sure about the versions involved.

Security exception while running the java client for a secured web service.

hi,
I created a proxy for a secured web service.
When I run the client java program I am getting the following exception :
java.io.IOException: could not load the default-keystore.jks file because The keystore file is tampered or password is incorrect.
Its saying that password is invalid.
Can you please help me on this thanks in advance.
Regards,
Chandra

hi,
I created a proxy for a secured web service.
When I run the client java program I am getting the following exception :
java.io.IOException: could not load the default-keystore.jks file because The keystore file is tampered or password is incorrect.
Its saying that password is invalid.
Can you please help me on this thanks in advance.
Regards,
Chandra

Running the Java program as service.

Hi,
I want to create have java program, which runs continously. This would hit check a table in Database for any new records and if there is anything it would post a message to another service. It would keep track of how many messages were posted and how many were completed at any point of time.I should have the ability to stop this service. When a stop sequence is initiated, it should wait till all the messages are processed and shutdown. I am looking for inputs on how to invoke the java program as service and the second part (stopping the service). I dont want to Java wrapper service or commons daemon api. I am on JDK 1.4.2
Thanks in Advance.
Regards,
Arul.

Do you want to write a daemon? I dont think you can do it without some explicit OS support..
Well, lemme know if you find a way

Running the java compiler

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