Off topic:NoClassDefFoundError of biojava

Question

[sydghyyh14]

I want to test biojava with code as following:

import org.biojava.nbio.core.exceptions.CompoundNotFoundException;
import org.biojava.nbio.core.sequence.*;
public class biotest {

 public static void main(String[] args) throws CompoundNotFoundException {
        System.out.println("Hello, biojava!");
        DNASequence dnaseq = new DNASequence("ATGCATGC");
       }

}

I got error like this:

Hello, biojava!
Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
 at org.biojava.nbio.core.sequence.template.AbstractSequence.<clinit>(AbstractSequence.java:52)
 at btest.biotest.main(biotest.java:12)
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
 at java.net.URLClassLoader$1.run(Unknown Source)
 at java.net.URLClassLoader$1.run(Unknown Source)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
 at java.lang.ClassLoader.loadClass(Unknown Source)
 ... 2 more

Who can tell me how to fix it?