I installed the java JDK and went through a tutorial but when it came to do javac I get command not found. I searched my whole system several different ways and it seems I dont have javac. How do I get it?

I am using slackware 10.2

Thanks

By installing the JDK, I guess you only installed the JRE (runtime).

The instructions said to install the JDK so I did, I also installed the JRE after.

You should not need to download a separated JRE. The SDK already has a JRE. The error you are getting is most likely because you don't have java on your path. A quick search in this forum for Java Path will bring some threads. This question is very common and even I have answered it more than once. You could also search google.com for "java path linux" or even at Sun's site there is a tutorial about that.

I won't post any direct links, this is just a simple case of searching...

Hi, M$ISBS -

1. The "official" instructions for installing Sun Java are here:
http://java.sun.com/j2se/1.5.0/install-linux.html

2. I'll admit that that the instructions can be confusing if you've never done it before. Please feel free to post any follow-on questions to LQ.

3. In your posts, please try to be as SPECIFIC as possible.

For example, cut/paste the filename you're trying to extract (this would give a lot of information: it would tell us whether it's the JRE or the JDK, whether it's an .rpm or a .bin - or even whether it's Sun Java or "something else").

Please, too, cut/paste exact error messages you might be getting.

Good luck .. PSM

Thanks for the replies. I found the file javac. I now have a new problem though. When I run java HelloWorldApp, I get these errors:


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(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)
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp/java

Does this look hard to fix?
I know nothing about java and am just starting out.

could you please post the code? we'd be more than happy to help you.

oh, and don't let the mass error runtime code throw you off, Java likes doing that.

/**
* The HelloWorldApp class implements an application that
* simply prints "Hello World!" to standard output.
*/
class HelloWorldApp {
public static void main(String[] args) {
System.out.println("Hello World!"); // Display the string.
}
}

is the name of the file HelloWorldApp.java?

edit: fixed typo

Without the w in hello, otherwise, yes.

i made the same filename and pasted your code and tried it (on windows) and it compiled and ran without any messages.
when you use 'javac' to compile you include the '.java' in the filename, when you run it with 'java' you dont include any extension, just 'java HelloWorldApp', is this what your doing?

hmm....I would try removing the compiled .class file , recompiling it , then running it .

I hope it works

"Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp/java"

Interesting error message. I remember getting garbage messages like this whenever I would try to create .jar files.

I haven't programmed Java in a couple years now, but you might want to try putting "public" on your class:
public class HelloWorldApp {

nadroj:
Yes, thats exactly how I am doing it.

indienick:
I tried that and I get the same error messages as before.

I just tried something different. I logged in as root and tried it, but I had to put ./ in front of javac and java, the long list of errors went away but I still get:

"Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp/java"

did you setup the environment variables properly? it should be in the documentation on the site that you downloaded it from