Java, basic class path problems

Question

I've been writing simple programs in Java, but seem to run into problems where the class path is involved.

My compiled class files exists in the directory: /home/pi/code/java/eclipse/bin/

When in this directory I can run "java Controller" and the program will run.

Experimenting with the class path I tried the following:"java -cp /home/pi/code/java/ eclipse.bin.Controller"

But I get the following exception:

"Exception in thread "main" java.lang.NoClassDefFoundError: eclipse/bin/Controller (wrong name: Controller)
"

The weirdest thing is that Java even constructed the final section "eclipse.bin.Controller", e.g. I could tab it when i was typing the command, so I expected this to work.

My end goal is to point the class path at a JDBC driver.

Where am I going wrong?

The explanations here may help you I think.

A4L
– A4L

2013-06-11 20:38:26 +00:00
Commented Jun 11, 2013 at 20:38 — A4L
– A4L, Commented Jun 11, 2013 at 20:38

Maarten Bodewes · Accepted Answer · 2013-06-11 20:38:28Z

1

java -cp /home/pi/code/java/eclipse/bin Controller

Would be the right way if you have your Controller class in the default package.

If you try to refer to your class as eclipse.bin.Controller the Java runtime will look for the Controller class within the package eclipse.bin and packages are not directories.

edited Jun 11, 2013 at 20:38

Maarten Bodewes

94.6k15 gold badges169 silver badges289 bronze badges

answered Jun 11, 2013 at 20:31

Christian

3,7311 gold badge32 silver badges26 bronze badges

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

2 Comments

Maarten Bodewes Over a year ago

Xerphiel, packages and the classpath are tricky to get to the bottom of, and you will have some frustration handling them. They are however required knowledge for a Java programer. They are kind of the linker configuration for Java if you know C/C++, although not that frustrating in my opinion.

Xerphiel Over a year ago

Thanks for the info, I've looked at some tutorials but nothing is making huge amounts of sense (although it is late). Any good tutorials would be greatly appreciated!

Collectives™ on Stack Overflow

Java, basic class path problems

1 Answer 1

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related