javac "Cannot find symbol"

Hello.

Im struggeling with java packages.

I have 2 files:

C:\Users\admin\Documents\NetBeansProjects\JavaAppl ication10\src\javaapplication10\Main.java

Code:

---

package javaapplication10;



/**
 *
 * @author admin
 */
public class Main {

    /**
    * @param args the command line arguments
    */
    public static void main(String[] args) {
        // TODO code application logic here

        say say = new say();
        System.out.print(say.hello() + "\n");
    }

}

---

And


C:\Users\admin\Documents\NetBeansProjects\JavaAppl ication10\src\javaapplication10\say.java

Code:

---

package javaapplication10;

/**
 *
 * @author admin
 */
public class say {

    public String hello()
    {
        String msg = "hello";
        return msg;
    }
    public String goodbye()
    {
        String msg = "goodbye";
        return msg;
    }
}

---

when i try to compile i get the following error:

Code:

---

PS C:\Users\admin\Documents\NetBeansProjects\JavaApplication10\src\javaapplication10> javac Main.java
Main.java:22: cannot find symbol
symbol  : class say
location: class javaapplication10.Main
        say say = new say();
        ^
Main.java:22: cannot find symbol
symbol  : class say
location: class javaapplication10.Main
        say say = new say();
                      ^
2 errors

---

If i comment the package declaration out. i can compile and run the files fine without any problems. i dont understand this. any help is greatly appriciated.

/mads

Your code worked on my system, and I'm also using NetBeans. So I'm sure your code is correct. :)

I did a quick search on NetBeans for similar cases, and I found a thread that might be useful: NetBeans Forums - Netbeans claims it cannot find "symbol"

Skip down to Damian's response about clearing the cache. Maybe that is the same thing you are experiencing. Good Luck!

Chris

I dont know how this shouldt affect the "compiler" as i get this error at compile time.
Anyway i did "clear" the cache. the problem persists.

/mads

And i only get this "error" when i use package. if i comment the package declaration out. it compiles and runs fine.

Go up a level and compile from there.
I think the compiler is looking for "say" in a javaapplication10 from where you are running javac, so it can't find it.

When using packages, the class path for the javac command must point to the folder containing the package folder. You can set the classpath up one level by using a classpath something like this:
-classpath .;..\.
Current folder and up one level

That's the other option...;)

I can now compile if i follow Norm's advice, compiling from "elevated ground" :)

But now i get a new error:

PS C:\Users\admin\Documents\NetBeansProjects\JavaAppl ication10\src\javaapplication10> java Main.java
Exception in thread "main" java.lang.NoClassDefFoundError: Main/java
Caused by: java.lang.ClassNotFoundException: Main.java
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)
Could not find the main class: Main.java. Program will exit.
PS C:\Users\admin\Documents\NetBeansProjects\JavaAppl ication10\src\javaapplication10>

Again. this works fine without the package declaration.

Quote:

---

Originally Posted by madsovenielsen

I can now compile if i follow Norm's advice, compiling from "elevated ground" :)

But now i get a new error:

PS C:\Users\admin\Documents\NetBeansProjects\JavaAppl ication10\src\javaapplication10> java Main.java
Exception in thread "main" java.lang.NoClassDefFoundError: Main/java
Caused by: java.lang.ClassNotFoundException: Main.java
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)
Could not find the main class: Main.java. Program will exit.
PS C:\Users\admin\Documents\NetBeansProjects\JavaAppl ication10\src\javaapplication10>

Again. this works fine without the package declaration.

---

Your class is not named 'Main' it is named 'javaapplication10.Main'.

kind regards,

Jos

package javaapplication10;



/**
*
* @author admin
*/
public class Main {

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here

say say = new say();
System.out.print(say.hello() + "\n");
}

}

My class is named Main.

It's in the javaapplication10 package, which means it is called javaapplication10.Main.
That's how java naming works.

package javaapplication10;



/**
*
* @author admin
*/
public class javaapplication10.Main {

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here

say say = new say();
System.out.print(say.hello() + "\n");
}

}

I get an error in NetBeans and i get the following error when i try to compile:

javaapplication10\Main.java:14: '{' expected
public class javaapplication10.Main {
^
1 error

Quote:

---

Originally Posted by madsovenielsen

package javaapplication10;



/**
*
* @author admin
*/
public class javaapplication10.Main {

/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here

say say = new say();
System.out.print(say.hello() + "\n");
}

}

I get an error in NetBeans and i get the following error when i try to compile:

javaapplication10\Main.java:14: '{' expected
public class javaapplication10.Main {
^
1 error

---

You should read some tutorials first before you drown in classpath issues, compilation problems and your own incorrect fantasy.

kind regards,

Jos

My code is now like this:

Main.java

Code:

---

package javaapplication10.Main;

import javaapplication10.say.say;

/**
 *
 * @author admin
 */
public class Main {

    /**
    * @param args the command line arguments
    */
    public static void main(String[] args) {
        // TODO code application logic here

        say say = new say();
        System.out.print(say.hello() + "\n");
    }

}

---

say.java

Code:

---

package javaapplication10.say;

/**
 *
 * @author admin
 */
public class say {

    public String hello()
    {
        String msg = "hello";
        return msg;
    }
    public String goodbye()
    {
        String msg = "goodbye";
        return msg;
    }
}

---

The files is in the directories:

say and Main

i can compile say.java fine. but when i try to compile Main.java get the following error:

Main\Main.java:8: package javaapplication10.say does not exist
import javaapplication10.say.say;
^
Main\Main.java:22: cannot find symbol
symbol : class say
location: class javaapplication10.Main.Main
say say = new say();
^
Main\Main.java:22: cannot find symbol
symbol : class say
location: class javaapplication10.Main.Main
say say = new say();
^
3 errors

I have no errors in NetBeans and i have looked through this "tutorial"

The Java Package Tutorial

Any help is greatly appriciated.

Now you have two packages: javaapplication10.Main and javaApplication10.say; my guess is that it's not what you want. Study those tutorials and don't be in a hurry.

kind regards,

Jos

I have now read this one to:
Java - Packages

No help either. i just can't understand this.

Both files, say.java and Main.java reside in the _same_ directory.

Quote:

---

java Main.java

---

The java command is for executing a program.
The javac command is for compiling a program.

In post#8 You are using the wrong command to compile. Use javac

Use: java Main (no file extension)
to execute a class.

Im sorry. it was a bit unclear.

I have compiled the code succesfully. but when i try to run it i get this error:

Code:

---

PS C:\Users\admin\Documents\NetBeansProjects\JavaApplication10\src\javaapplication10> ls


    Directory: C:\Users\admin\Documents\NetBeansProjects\JavaApplication10\src\javaapplication10


Mode                LastWriteTime    Length Name
----                -------------    ------ ----
-a---        07-10-2010    07:16        646 Main.class
-a---        06-10-2010    21:33        415 Main.java
-a---        07-10-2010    07:16        339 say.class
-a---        06-10-2010    21:09        359 say.java


PS C:\Users\admin\Documents\NetBeansProjects\JavaApplication10\src\javaapplication10> java Main
Exception in thread "main" java.lang.NoClassDefFoundError: Main (wrong name: javaapplication10/Main)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(Unknown Source)
        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$000(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)
Could not find the main class: Main.  Program will exit.
PS C:\Users\admin\Documents\NetBeansProjects\JavaApplication10\src\javaapplication10>

---

Again. if i remove the package declaration it compiles and runs fine.

Any help is greatly appriciated

I'm not totally with this thread, but looking at the last error, are you sure that the package is exist physically that you've mentioned in the class?

As i understand packages. after reading these tutorials:

Java - Packages
The Java Package Tutorial

A package is just a folder that contains the files. in my situation: javaapplication10

And yes the folder exists. :)