Error on command prompt when running a class

[Kerri Efune]

Hi

I am getting the below error on the command prompt when I am trying to run a class with this command: java packageb.ClassB

Error: Could not find or load main class packageb.ClassB

I have followed all the instructions from the OCA Oracle Certified Associate Java SE 8 Programmer I Study Guide Exam 1Z0-808.pdf course from the Compiling Code with Packages in chapter 1, so I do not understand what I am doing wrong. Please assist

Thanks

[Campbell Ritchie]

Welome to the Ranch

Please don't think about running a class; you are running a method; in this case the method you are trying to run is the main() method.
Please tell us how you compiled the code, and what the contents of your directory are. You should have a directory visible from your current location called packageb and that should contain a file named ClassB.class
Also: did you set a CLASSPATH?

[Junilu Lacar]

Welcome to the Ranch.

It would be best if you copy-pasted all the relevant text from the console so we can see exactly what you tried. Also, use dir or las to list the directories you're working in and what files are in them. A class packageb.ClassB should be in a file name ClassB.java that is in a folder named pakageb. You need to use the javac command to compile it before you can run it with the java command.

[Kerri Efune]

I compiled the code using this command: javac packagea/ClassA.java packageb/ClassB.java

Below is the content of the java file

package packageb;
import packagea.ClassA;
public class ClassB {
public static void main(String[] args) {
ClassA a;
System.out.println("Got it");
}
}


I have also attached a screenshot of the command prompt as well as the content of the folders

[Kerri Efune]

Not sure why my attachment didn't attach, but the below is from the command prompt

C:\JavaPractice>set path=C:\Program Files\Java\java-1.8.0-openjdk\bin

C:\JavaPractice>javac packagea/ClassA.java packageb/ClassB.java

C:\JavaPractice>java packageb.ClassB
Error: Could not find or load main class packageb.ClassB

C:\JavaPractice>

The below are my folder paths and they have both the (ClassA.java and ClassA.class)and (ClassB.java and ClassB.class) files respectively in them

C:\JavaPractice\packagea
C:\JavaPractice\packageb

[Campbell Ritchie]

Kerri Efune wrote:. . . I have also attached a screenshot . . .

You don't appear to have added it, but it is better to avoid screenshots; they are often difficult to read.
Try compiling classA on its own first.
Don't set the PATH to contain one directory only. Write set path=C:\Program Files\Java\java-1.8.0-openjdk\bin;%PATH%
Otherwise I can't see anything wrong with what you posted.
There remains the possibility that you have set a CLASSPATH. Try setting a local CLASSPATH. Try java -cp . packageb.ClassB

[edit]Correct minor spelling error producing ਏ character.

[Kerri Efune]

ah thanks a lot, setting that classpath resolved it

[Campbell Ritchie]

That's a pleasure

I think the real problem may be that you have set a system or user CLASSPATH. Please show us what happens when you write echo %CLASSPATH% and you will probably have to go to your environment variables and delete the CLASSPATH.

[Kerri Efune]

yes I get the below path when i wrote it

C:\JavaPractice>echo %CLASSPATH%
C:\Program Files (x86)\Altova\xmlspy\XMLSpyInterface.jar

If I delete this path, would it interfere with the software I am using above

[Campbell Ritchie]

Kerri Efune wrote:. . . C:\JavaPractice>echo %CLASSPATH% . . . If I delete this path . . .

Maybe the nomenclature is a bit confusing: the CLASSPATH comprises any number of paths to resources.

That doesn't count as part of the PATH environment variable. What that is doing, as part of the CLASSPATH, is saying to any code using it,

You will always need the SpyInterface resource, and nothing else.

Please delete the whole of the system or user CLASSPATH and use -cp or set CLASSPATH=... when you actually need to change it.