exception while integrating mahout recommender engine in java web application
https://stackoverflow.com/questions/9323374
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I am trying to implement recoemmender code in java dynamic web application using direct approach. i can compile the code but when i run the application on server i am getting following error:
type Exception report
message description The server encountered an internal error () that prevented it from fulfilling this request.
exception javax.servlet.ServletException: Servlet execution threw an exception
root cause java.lang.NoClassDefFoundError: org/apache/mahout/cf/taste/model/DataModel com.demoMahout.HelperRecommender.getUserBasedRecommendation(HelperRecommender.java:96) com.demoMahout.HelperRecommender.doPost(HelperRecommender.java:53) javax.servlet.http.HttpServlet.service(HttpServlet.java:641) javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
root cause java.lang.ClassNotFoundException: org.apache.mahout.cf.taste.model.DataModel org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1676) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1521) java.lang.ClassLoader.loadClassInternal(ClassLoader.java:332) com.demoMahout.HelperRecommender.getUserBasedRecommendation(HelperRecommender.java:96) com.demoMahout.HelperRecommender.doPost(HelperRecommender.java:53) javax.servlet.http.HttpServlet.service(HttpServlet.java:641) javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
How can i resolve this issue?
Solution
It means just what it says: you don't have the Mahout classes included in your web app! put the JAR files in WEB-INF/lib as you need to do with any other library a web app needs.
