Setting path to java_home

Question

I am a beginner to Java as well as to Ubuntu.

I downloaded JDK 10.0.2 zip file and unzipped using tar command.

I used vim .bashrc and typed the following

export JAVA_HOME=path of my Java
export PATH=$JAVA_HOME/bin:$PATH
source .bashrc

echo $JAVA_HOME and echo $PATH giving the correct path of my Java 10.0.2

I am able to compile the file using the javac command and .class file created successfully.

When I am running java ( java ./Desktop/app/Numbers) referring to the class file, I am not able to run and getting the "Main class not found exception"

But, when I go to that particular folder and execute the javac as well as java, I am getting the output.

What I have tried

1) vim .bashrc and typed the above. But it didn't work.

2) sudo vim ./etc/environment and tried adding within the quotes :/javapath/bin". It didn't work.

Guide me where I am going wrong.

Answer 1

Ok run that command like this:

java -classpath /home/$USER/Desktop/app Numbers

Since your running it from another location java expects this format:

java -classpath /path/to/class/file class_file_name

NOTE: The space between path and class file name. See java -help or man java