java.lang.NoClassDefFoundError: org/uncommons/maths/random/MersenneTwisterRNG解决方法参考

来源：互联网发布：德语识别算法编辑：程序博客网时间：2024/06/03 17:18

1 说明
这是我在用mahout搭建电影推荐平台时遇到的一个错误，错误信息具体如下。

2 错误详细信息
message
description The server encountered an internal error () that prevented it from fulfilling this request.

exception
javax.servlet.ServletException: Servlet execution threw an exception

java.lang.NoClassDefFoundError: org/uncommons/maths/random/MersenneTwisterRNG
org.apache.mahout.cf.taste.impl.common.FastByIDMap.(FastByIDMap.java:81)
org.apache.mahout.cf.taste.impl.common.FastByIDMap.(FastByIDMap.java:54)
org.apache.mahout.cf.taste.impl.model.file.FileDataModel.buildModel(FileDataModel.java:150)
org.apache.mahout.cf.taste.impl.model.file.FileDataModel.reload(FileDataModel.java:129)
org.apache.mahout.cf.taste.impl.model.file.FileDataModel.checkLoaded(FileDataModel.java:332)
org.apache.mahout.cf.taste.impl.model.file.FileDataModel.getNumItems(FileDataModel.java:390)
org.apache.mahout.cf.taste.impl.similarity.AbstractSimilarity.(AbstractSimilarity.java:59)
org.apache.mahout.cf.taste.impl.similarity.AbstractSimilarity.(AbstractSimilarity.java:49)
org.apache.mahout.cf.taste.impl.similarity.PearsonCorrelationSimilarity.(PearsonCorrelationSimilarity.java:45)
com.rcd.model.recommender.MyItemBasedRecommender.myItemBasedRecommender(MyItemBasedRecommender.java:23)
com.rcd.servlet.RecomendServlet.doPost(RecomendServlet.java:61)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

java.lang.ClassNotFoundException: org.uncommons.maths.random.MersenneTwisterRNG
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1516)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1361)
java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
org.apache.mahout.cf.taste.impl.common.FastByIDMap.(FastByIDMap.java:81)
org.apache.mahout.cf.taste.impl.common.FastByIDMap.(FastByIDMap.java:54)
org.apache.mahout.cf.taste.impl.model.file.FileDataModel.buildModel(FileDataModel.java:150)
org.apache.mahout.cf.taste.impl.model.file.FileDataModel.reload(FileDataModel.java:129)
org.apache.mahout.cf.taste.impl.model.file.FileDataModel.checkLoaded(FileDataModel.java:332)
org.apache.mahout.cf.taste.impl.model.file.FileDataModel.getNumItems(FileDataModel.java:390)
org.apache.mahout.cf.taste.impl.similarity.AbstractSimilarity.(AbstractSimilarity.java:59)
org.apache.mahout.cf.taste.impl.similarity.AbstractSimilarity.(AbstractSimilarity.java:49)
org.apache.mahout.cf.taste.impl.similarity.PearsonCorrelationSimilarity.(PearsonCorrelationSimilarity.java:45)
com.rcd.model.recommender.MyItemBasedRecommender.myItemBasedRecommender(MyItemBasedRecommender.java:23)
com.rcd.servlet.RecomendServlet.doPost(RecomendServlet.java:61)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.26 logs.

3 我的解决方法
导入uncommons-maths-1.2.jar包，然后错误就可以得到解决。
【下载地址】 http://download.csdn.net/detail/liu_005/9391660

【注】这只是我的解决方法，仅供参考。如有不当之处，欢迎指正。

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