How to solve java.lang.ClassNotFoundException: org.slf4j.LoggerFactory

The error is:

Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
    at com.github.sarxos.webcam.Webcam.<clinit>(Webcam.java:38)
    at capturador.Capturador.main(Capturador.java:27)
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
    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)
    ... 2 more

This is because SLF4J jar file needs to be added into your application's classpath. SLF4J is required by Webcam Capture API for logging purpose.

Where to find SLF4J jar? You can either:

• The best is to download latest stable ZIP file with Webcam Capture API (you will find link on the project main page in Download section) and take required JARs from libs directory of this ZIP, or
• Download required JARs from Maven Central (but you have to make sure to find the appropriate version), or
• Build your project with Maven.