问题
I am running my app on google app engine. All I have is a simple servlet that is trying to use Jsoup. However when I run the application I get java.lang.ClassNotFoundException: org.jsoup.Jsoup.
I am using Eclipse so I added the jsoup jar file in the Java Build Path -> Libraries
回答1:
You need to put the Jsoup JAR file in the /WEB-INF/lib folder of the webapp. That folder is covered by webapp's default classpath. Also, Eclipse will automagically put all libraries in /WEB-INF/lib folder in the buildpath of the project, you shouldn't need to do that manually. Of course I assume that the project is been created as Dynamic Web Project.
回答2:
Another way to add the .jar is to right click on your project, and choose Properties -> Java Build Path, click the Libraries tab, then click Add External JARs... This will allow you to browse to the path of the .jar file you wish to add.
回答3:
Also make sure your import org.jsoup.Jsoup; imports are after all the application imports such as
import com.google.gwt.core.client.GWT;
Having the JSOUP imports before those other imports caused errors for deploying an application at one point for me.
回答4:
I had the same error now on my Android project. To Fix this on Android, you need to create a lib folder and put the .jar file there
来源：https://stackoverflow.com/questions/4235855/getting-a-java-lang-classnotfoundexception-org-jsoup-jsoup