Could not find or load default class

Question

I try to using Runtime but have some problem. I want to use Runtime.exec("java -cp"). One is jar file, another is class file. Class file is refer to jar file but not included. Below is my code

  Runtime rt = Runtime.getRuntime();
    Process proc = null;

    System.out.println(Run.class.getResource("").getPath());
    try {
        proc = rt.exec("java -cp c:/data/hh.jar; com/list/shark/Whale");
    } catch (IOException e1) {
        e1.printStackTrace();
    }

Result is "could not find or load default class". I really want to know that where is location executing runtime and how sole this problem.

PS In local cmd, command is working.

Don't use quote formatting for text that isn't quoted. Don't post pictures of text: post the text. Unclear what you're asking. — user207421, Dec 23 '16 at 08:34

score 0 · Answer 1 · edited May 23 '17 at 12:24

0

The command you are using is wrong.

For running a jar from command line:

java -jar <jar-file-name>.jar

If you did not create a manifest file in your jar, java -jar will not work. Then you will need to specify the FQP (fully-qualified classpath) explicitely in the command:

java -cp <fully.qualified.class.path>

There is a good answer on how to create and run jar that you might want to check out

edited May 23 '17 at 12:24

Community

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answered Dec 23 '16 at 08:24

aviad

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yes command is working in cmd but don't working in java runtime I really know about that – ho9 Dec 23 '16 at 08:41
what is the exact exception thrown? – aviad Dec 23 '16 at 08:55
@ho9 I think you need to have an administrator access. Try compiling the project to jar and grant it an admin access and see if that works. – Enzokie Jan 02 '17 at 04:27
@ho9 That command is not working at all. You need to change the slashes to dots. – user207421 Jan 02 '17 at 05:23

ho9 · Answer 2 · 2017-01-02T04:24:07.613

0

I post answer for someone who have same trouble

just do

 RunTime.exec("cmd /c dir");

It is for find out executing current path

and change from exec(command) to exec(command,env,file).

create fileand input executing current path

 File file = new File("c:/Test/");

 RunTime.exec("java -cp c:/data/hh.jar; com.list.shark.Whale",null,file);

this is success for execute class File referencing other jar file.

edited Jan 02 '17 at 04:24

answered Dec 27 '16 at 02:13

ho9

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6

What does `cmd /c dir` have to do with it? All it does is tell you the value of `System.getProperty("user.dir")`, and you don't need to exec anything for that. – user207421 Jan 02 '17 at 05:23

Could not find or load default class

2 Answers2