Question

package com.scheduler.process;

public class Process {
    public enum state {
        NOT_SUBMITTED, SUBMITTED, BLOCKED, READY, RUNNING, COMPLETED 
    }
        private state currentState;

    public state getCurrentState() {
        return currentState;
    }

    public void setCurrentState(state currentState) {
        this.currentState = currentState;
    }

}



package com.scheduler.machine;
import com.scheduler.process.Process;
import com.scheduler.process.Process.state;

public class Machine {
    com.scheduler.process.Process p = new com.scheduler.process.Process();
    state s = state.READY;  //fails if I don't also explicitly import Process.state
    p.setCurrentState(s);  //says I need a declarator id after 's'... this is wrong.
    p.setCurrentState(state.READY);
}

Modified the example to try and direct to the issue. I cannot change the state on this code. Eclipse suggests importing Process.state like I had on my previous example, but this doesn’t work either. This allows state s = state.READY but the call to p.setCurrentState(s); fails as does p.setCurrentState(state.READY);

Problem continued…. Following Oleg’s suggestions I tried more permutations:

package com.scheduler.machine;
import com.scheduler.process.Process;
import com.scheduler.process.Process.*;

public class Machine {
    com.scheduler.process.Process p = new com.scheduler.process.Process();
    public state s = Process.state.READY;  
    p.setCurrentState(s);
    p.setCurrentState(state.READY);
}

Okay. It’s clear now that I’m a candidate for lobotomy.

package com.scheduler.machine;

import com.scheduler.process.Process;
import com.scheduler.process.Process.state;

public class Machine {

    public void doStuff(){
        com.scheduler.process.Process p = new com.scheduler.process.Process();
        state s = state.READY;  //fails if I don't also explicitly import Process.state
        p.setCurrentState(s);  //says I need a declarator id after 's'... this is wrong.
        p.setCurrentState(state.READY);
    }

}

I needed to have a method in the class–but we’re still missing something (probably obvious) here. When I go via the command line and run javac on the Machine class AFTER compiling Process, I still get the following error:

mseil@context:/media/MULTIMEDIA/Scratch/Scratch/src/com/scheduler/machine$ javac Machine.java
Machine.java:3: package com.scheduler.process does not exist
import com.scheduler.process.Process;
^


So I guess the question now becomes, what idiot thing am I missing that is preventing me from compiling this by hand that eclipse is doing for me behind the scene?

======
Problem solved here:
Java generics code compiles in eclipse but not in command line

Answer 1

Eclipse doesn’t use the Sun JDK by default. I would assume that you are using Eclipse’s built in compiler as Sun’s JDK and the OpenJDK are almost identical.

Java code compiles and runs exact the same on Windows and Linux most of the time (unless you use a few of the platform specific operations)

I suspect you are not building the code the same way and when you compile Machine, the Process class has not been compiled.

I suggest you use a standard build system like maven or ant and it will build the same everywhere. Failing that run Eclipse on Linux or just the same .class you use on windows as they don’t need to be re-compiled in any case.

BTW: You don’t need to import Process.state as it not used and its in the same package (so you wouldn’t need to if you did)