Error: Could not find or load main class [duplicate]

Answer 1

You can try these two when you are getting the error: 'could not find or load main class'

If your class file is saved in following directory with HelloWorld program name d:\sample

1. java -cp d:\sample HelloWorld
2. java -cp . HelloWorld

Answer 2

Check your BuildPath, it could be that you are referencing a library that does not exist anymore.

Answer 3

I have a similar problem in Windows, it's related to the classpath. From the command line, navigate until the directory where it's located your Java file (*.java and *.class), then try again with your commands.

Answer 4

You have to set the classpath if you get the error:

Could not find or load main class XYZ

For example:

E:\>set path="c:\programfiles\Java\jdk1.7.0_17\bin"
E:\>set classpath=%classpath%;.;
E:\>javac XYZ.java
E:\>java XYZ

Answer 5

If so simple than many people think, me included :)

cd to Project Folder/src/package there you should see yourClass.java then run javac yourClass.java which will create yourClass.class then cd out of the src folder and into the build folder there you can run java package.youClass

I am using the Terminal on Mac or you can accomplish the same task using Command Prompt on windows

Answer 6

java -verbose:class HelloWorld might help you understand which classes are being loaded.

Also, as mentioned before, remember to call the full qualified name (i.e. include package).