javax.servlet.ServletException: Servlet execution threw an exception
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.NoClassDefFoundError: com/google/common/base/Preconditions
org.apache.hadoop.conf.Configuration$DeprecationDelta.(Configuration.java:314)
org.apache.hadoop.conf.Configuration$DeprecationDelta.(Configuration.java:327)
org.apache.hadoop.conf.Configuration.(Configuration.java:409)
dfs.HDFSOperation.(HDFSOperation.java:39)
control.DownloadHDFSServlet.doPost(DownloadHDFSServlet.java:42)
javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.ClassNotFoundException: com.google.common.base.Preconditions
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
org.apache.hadoop.conf.Configuration$DeprecationDelta.(Configuration.java:314)
org.apache.hadoop.conf.Configuration$DeprecationDelta.(Configuration.java:327)
org.apache.hadoop.conf.Configuration.(Configuration.java:409)
dfs.HDFSOperation.(HDFSOperation.java:39)
control.DownloadHDFSServlet.doPost(DownloadHDFSServlet.java:42)
javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)