Why i can't run this jar with shell_exec?

Question

i have create the java class below. This class uses twitter4java api for java-twitter communication.

import twitter4j.*;
import twitter4j.auth.AccessToken;

import java.util.List;

public class SearchTweets {

    public static String API_Key = new String("xxxxxxxxxxxxxxxxx");
    public static String API_Secret = new String("xxxxxxxxxxxxxxxxx");
    public static String Access_Token = new String("xxxxxxxxxxxxxxxxx");
    public static String Access_Token_Secret = new String("xxxxxxxxxxxxxxxxx");

    public static void main(String[] args) {

        Twitter twitter = new TwitterFactory().getInstance();
        twitter.setOAuthConsumer(API_Key, API_Secret);
        AccessToken accessToken = new AccessToken(Access_Token, Access_Token_Secret);
        twitter.setOAuthAccessToken(accessToken);

        try {
            Query query = new Query("paok");
            QueryResult result;
            do {
                result = twitter.search(query);
                List<Status> tweets = result.getTweets();
                for (int i=0 ; i < tweets.size() ; i++)  {
                    Status s = tweets.get(i);
                    if (s.getPlace() != null) {
                        System.out.println("@" + s.getUser().getScreenName() + " - " + s.getPlace().getName());                     
                    }
                }
            } while ((query = result.nextQuery()) != null);
            System.exit(0);
        } catch (TwitterException te) {
            te.printStackTrace();
            System.out.println("Failed to search tweets: " + te.getMessage());
            System.exit(-1);
        }
    }
}

I have create it in eclipse. Now i want run it on a web site with php. I use shell_exec. First i create a simple java class for testing and all running ok.

After i go run my SearchTweets class and i can't. I export my project in a jar from eclipse. But when go run it i take this from terminal

itsoum@itsoum-Inspiron-3542:/opt/lampp/htdocs/tweet$ java -jar ilias.jar Exception in thread "main" java.lang.NoClassDefFoundError: twitter4j/TwitterException at java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Class.java:2625) at java.lang.Class.getMethod0(Class.java:2866) at java.lang.Class.getMethod(Class.java:1676) at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:494) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:486) Caused by: java.lang.ClassNotFoundException: twitter4j.TwitterException at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:358 ) ... 6 more

Any idea what goes wrong?

Answer 1

Your program refers to external library (twitter4j), you would need to reference this external lib to run your program

You have two options:

• include all jar files from the lib directory into the manifest of your jar file (you can use relative paths there)
• Specify everything (including your jar) on the command line using -cp: java -cp ilias.jar:<path to twitter4j.jar> SearchTweets.Main