“Could not find or load main class org.apache.derby.tools.ij” on Eclipse when trying to run derby

Question

I am all very new to database systems. I am trying to connect derby to Eclipse by passing in this command

    java org.apache.derby.tools.ij 

under the external tools configurations in the "Arguments" section. I have set the location to

/Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home/bin/java

and the error is that it "Could not find or load main class org.apache.derby.tools.ij".

I have tried using javac and javadoc but still, have had no success. Also, I have and OS machine.

Ideally, when this is set up properly I can start inserting to the database when I see ij> in the console.

Answer 1

You have to specify a classpath, either using a command line argument or by setting it into the environment, so that the java command knows where to find the main class you want it to run.

https://docs.oracle.com/javase/8/docs/technotes/tools/windows/classpath.html or run java -help for a short guide of its common arguments.