Could not find or load main class , environment variables

Question

I know this has come up a number of times, but previous responses just don't seem to help. My environment variables are :

CLASSPATH C:\Program Files\Java\jre7\lib;C:\Program Files\Java\jdk1.7.0_15\bin;
PATH C:\Program Files\Java\jdk1.7.0_15\bin;

When moving to the directory as follows C:\Users\Oli\My Documents\java I can compile using javac, but cannot runt he program using java. I know its most likely got something to do with environment variables but I cannot get it to work. P.S the error is "could not find or load main class"

Any help would be appreciated.

flyinrhyno · Accepted Answer · 2013-02-21 17:20:50Z

3

CLASSPATH is the place where JRE looks for classes. You've set your CLASSPATH to a value and expect to run the class from current Directory, which won't work.. for instant solution you may use

java -cp C:\Users\Oli\My Documents\java ClassName

Or undo setting CLASSPATH. Default CLASSPATH is current directory

answered Feb 21, 2013 at 17:20

flyinrhyno

1591 silver badge7 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

user1428716 · Accepted Answer · 2013-02-21 17:26:22Z

3

Lets assume that your ".java" file default package ( no package defined) survivies in "C:\Src" You dont need to set the CLASSPATH in this case.

  cd C:\Src
  javac MyJava.java
  java MyJava

If with package say com.test

cd C:\Src
javac com\test\MyJava.java
java com.test.MyJava

However if you are not in the same folder as Source files and want to run from anywhere

set CLASSPATH=%CLASSPATH%;C:\src
javac MyJava.java or javac com\test\MyJava.java

and java com.test.MyJava or java com.test.MyJava

answered Feb 21, 2013 at 17:26

user1428716

2,1363 gold badges19 silver badges39 bronze badges

Comments

TofuBeer · Accepted Answer · 2013-02-21 17:12:20Z

2

Unset CLASSPATH and just use the default one provided by the JVM. Here is a link to the Java Tutorial that covers the environment variables.

answered Feb 21, 2013 at 17:12

TofuBeer

61.7k18 gold badges120 silver badges163 bronze badges

Comments

jobalo · Accepted Answer · 2014-06-01 03:28:54Z

0

Seems like the problem is not in the path... Does your code use the 'package' statement? (i.e. package my_package;)

If so, go to 'java' directory and execute:

java my_package.MyClass

where 'my_package' is the name of... the package, and MyClass is your compiled .java file (without the .class extension).

Good luck.

edited Jun 1, 2014 at 3:28

answered Jun 1, 2014 at 2:22

jobalo

34 bronze badges

Collectives™ on Stack Overflow

Could not find or load main class , environment variables

4 Answers 4

Comments

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related