How to add thirdparty library in classpath via ant for java jar? -

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i build code via ant , later try run main class.

java -cp my.jar mypackage.myclass

but have similar exception following:

exception in thread "main" java.lang.noclassdeffounderror: org/slf4j/loggerfactory     @ org.apache.nutch.crawl.crawlerservice.<clinit>(crawlerservice.java:31) caused by: java.lang.classnotfoundexception: org.slf4j.loggerfactory     @ java.net.urlclassloader$1.run(urlclassloader.java:366)     @ java.net.urlclassloader$1.run(urlclassloader.java:355)     @ java.security.accesscontroller.doprivileged(native method)     @ java.net.urlclassloader.findclass(urlclassloader.java:354)     @ java.lang.classloader.loadclass(classloader.java:423)     @ sun.misc.launcher$appclassloader.loadclass(launcher.java:308)     @ java.lang.classloader.loadclass(classloader.java:356)     ... 1 more

my main class:

import org.slf4j.logger; import org.slf4j.loggerfactory;  public class myclass{    private static final logger log = loggerfactory.getlogger(myclass.class);     public static void main(string[] args) throws exception {       system.out.println("test");    }  }

if don't use import org.slf4j.logger; import org.slf4j.loggerfactory;, no problem. if use, display exception.

this example. if import other libraries, display noclassdeffounderror exception those.

my manifest.mf file:

manifest-version: 1.0 ant-version: apache ant 1.8.4 created-by: 1.7.0_17-b02 (oracle corporation) main-class: mypackage.myclass class-path: ./lib

how add libraries don't found in classpath via ant jar?

my problem solved. manifest file update follows:

manifest-version: 1.0 ant-version: apache ant 1.8.4 created-by: 1.7.0_17-b02 (oracle corporation) main-class: mypackage.myclass class-path: lib/slf4j.jar

if multiple jar added want if multiple jar wanted add, should done follows:

class-path: lib/slf4j.jar lib/another.jar

my fault follows: ./lib or ./lib/* or lib/*.jar . understand it,all jars must written in manifest file .

ant script written similar to:

<target name="create_run_jar">      <jar destfile="/home/test/desktop/my.jar">         <manifest>             <attribute name="main-class" value="mypackage.myclass"/>             <attribute name="class-path" value="lib/slf4j.jar"/>             <attribute name="class-path" value="lib/another.jar"/>         </manifest>         <fileset dir="/home/test/workspace/filemonitor/bin"/>     </jar> </target>

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