Error when using java -classpath command

Question

I have a class, test, as follows

import java.io.File;
import java.io.IOException;

import org.ini4j.InvalidFileFormatException;
import org.ini4j.Wini;

public class test {

    public static void main(String[] args) throws InvalidFileFormatException, IOException{
        File f = new File("ini.ini");
        Wini ini = new Wini(f);
        int a = ini.get("test", "a", int.class);
        int b = ini.get("test", "b", int.class);
        int c = ini.get("test", "c", int.class);

        System.out.print(a);
        System.out.print(b);
        System.out.print(c);
    }
}

To compile I run the command

javac -classpath ini4j-0.5.4.jar test.java

which compiles without issue, but when I try to run it with the command

java -classpath ini4j-0.5.4.jar test

I get the error Error: Could not find or load main class test.

If I exclude the -classpath ini4j-0.5.4.jar from the java .. test command I get an error Exception in thread "main" java.lang.NoClassDefFoundError: org/ini4j/InvalidFileFormatException ...

The class runs fine in eclipse.

@XOR No I haven't, could you give me a code sample of what you mean exactly? — rj93, Aug 25 '15 at 15:17
When you specify the `-classpath` parameter, it overrides the *entire* classpath, which means that the current directory `.` isn't included anymore the way you're doing it. — Ian McLaird, Aug 25 '15 at 15:19

lscoughlin · Accepted Answer · 2015-08-25T15:23:58.953

5

You need to add the directory your compiled class file ends up into your classpath in your java invocation.

In your case

java -cp "ini4j-0.5.4.jar:." test

would be what you want, since everything is in the current working directory.

Edit: Updated for completeness ^^. The class path uses a system specific path separator. So for the unfortunate souls using windows it would be:

java -cp "ini4j-0.5.4.jar;." test

edited Aug 25 '15 at 15:23

answered Aug 25 '15 at 15:13

lscoughlin

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this answer is OS -specific, e.g. it will fail on Windows, see here http://stackoverflow.com/questions/4528438/classpath-does-not-work-under-linux – S. Pauk Aug 25 '15 at 15:15
@SergeyPauk is correct, it gives the same error as the original command – rj93 Aug 25 '15 at 15:18
if you are on Windows then replace the colon with a semicolon in the answer above – S. Pauk Aug 25 '15 at 15:19
changing the colon to a semi colon fixed it – rj93 Aug 25 '15 at 15:19
@lscoughlin it's not about being pedantic but about the completeness of a given answer (as it turned out the author is indeed an unfortunate windows user :) – S. Pauk Aug 25 '15 at 15:22
@SergeyPauk Fair enough ^^ – lscoughlin Aug 25 '15 at 15:23

Error when using java -classpath command

1 Answers1