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Fileupload is not working and it always returns the null value when the event.getMedia() is called.

Fileupload is not working and it always returns the null value when the event.getMedia() is called.

Fileupload is not working and it always returns the null value when the event.getMedia() is called.

Application Environment : Life Ray Portal 6.2 /Tomcat 7

Below is the Error log while doing file upload.

Oct 19, 2015 8:12:21 AM org.zkoss.zk.au.http.AuUploader handleError:224 SEVERE: Failed to upload

java.lang.NullPointerException at org.zkoss.zk.au.http.AuUploader.service(AuUploader.java:110) at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:456) at org.zkoss.zk.au.http.DHtmlUpdateServlet.doPost(DHtmlUpdateServlet.java:491) at javax.servlet.http.HttpServlet.service(HttpServlet.java:650) at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ... Oct 19, 2015 8:12:21 AM org.zkoss.xel.taglib.Taglibs getDefaultTLDs:326 FINE: Loading jar:file:/opt/liferay/instances/mapps-01/tomcat-home/webapps/ASSISTTabletApp/WEB-INF/lib/zk.jar!/metainfo/tld/config.xml Oct 19, 2015 8:12:21 AM org.zkoss.xel.taglib.Taglibs getDefaultTLDs:326 FINE: Loading jar:file:/opt/liferay/instances/mapps-01/tomcat-home/webapps/ASSISTTabletApp/WEB-INF/lib/zweb.jar!/metainfo/tld/config.xml Oct 19, 2015 8:12:22 AM org.zkoss.zk.au.http.AuUploader handleError:224 SEVERE: Failed to upload java.lang.NullPointerException at org.zkoss.zk.au.http.AuUploader.service(AuUploader.java:110) at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:456) at org.zkoss.zk.au.http.DHtmlUpdateServlet.doPost(DHtmlUpdateServlet.java:491) at javax.servlet.http.HttpServlet.service(HttpServlet.java:650) at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ... Oct 19, 2015 8:12:24 AM org.zkoss.zk.ui.impl.UiEngineImpl doActivate:1859