NoClassDefFoundError - Cannot find main class

[littleone]

Good morning,

I seem to have solved the first problem with compiling the ArrayListDemo.java file from the Command Prompt. No my simple problem is that I cannot run the ArrayListDemo.java file from the Command Prompt.
This file contains the main method.

Is there any reason as to why this is happening? How can I solve this problem?

[JosAH]

Javac (the compiler) compiles .java source files and produces a corresponding .class file. Java (the virtual machine) runs classes; the classes are normally stored in .class files so you should run your compiled code as:

java MyClass

while you had to compile the source code file as:

javac MyClass.java

kind regards,

Jos

[littleone]

Good Morning JosAH,

Yes,

I have been doing that. If you take a look at my Command Prompt screenshoots, I have compiled the files with javac and that worked fine. When I try to run the file using java it does not work. It states that it cannot find the main method.

Take a look at the screenshots and files. Could it be my configuration of my jdk or jre? Could something on my machine be interferring with it?

[JosAH]

Good Morning JosAH,

Yes,

I have been doing that. If you take a look at my Command Prompt screenshoots, I have compiled the files with javac and that worked fine. When I try to run the file using java it does not work. It states that it cannot find the main method.

Take a look at the screenshots and files. Could it be my configuration of my jdk or jre? Could something on my machine be interferring with it?

Good afternoon; you are trying to run your source file (the .java file); you should run the compiled .class file without the extension. Reread my previous reply.

kind regards,

Jos

[littleone]

Have mercy on me. I totally did not even realized that I overlooked that. That surely did the trick. I guess I had been fooling around with this so long, that I did not realize I was using the .java. I trust me, I know better than that. I got hung up trying to solve the compiling issue, that I mistakenly insert the .java after the file name.

Thanks for your help. I want to mark this as solved, how do I go about doing that?

Best regards,

littleone

[JosAH]

Have mercy on me. I totally did not even realized that I overlooked that. That surely did the trick. I guess I had been fooling around with this so long, that I did not realize I was using the .java. I trust me, I know better than that. I got hung up trying to solve the compiling issue, that I mistakenly insert the .java after the file name.

Thanks for your help. I want to mark this as solved, how do I go about doing that?

Best regards,

littleone

I don't know how to set a thread as 'solved'; as a topic starter you have a button named 'thread tools' (or similar) that seem to have an option for what you want.

kind regards,

Jos