java - Vaadin: adding a custom javascript to bootstrap page -


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i need add jquery bootstrap page of vaadin application. added following in custom servlet class

@override public void sessioninit(sessioninitevent event) throws serviceexception {     event.getsession().addbootstraplistener(new bootstraplistener() {         @override         public void modifybootstrappage(bootstrappageresponse response) {             //jquery necessary open in new window button             string contextpath = event.getrequest().getcontextpath();             response.getdocument().head().prependelement("script").attr("type", "text/javascript").attr("src", contextpath + "/vaadin/js/jquery.min.js");             response.getdocument().head().prependelement("script").attr("type", "text/javascript").attr("src", contextpath + "/vaadin/js/jquery-ui.js");         }          @override         public void modifybootstrapfragment(bootstrapfragmentresponse response) {         }     }); }

this code throws null pointer exception in event.getrequest().getcontextpath();

caused by: java.lang.nullpointerexception @ org.apache.catalina.connector.request.getservletcontext(request.java:1598) ~[catalina.jar:8.0.24] @ org.apache.catalina.connector.request.getcontextpath(request.java:1915) ~[catalina.jar:8.0.24] @ org.apache.catalina.connector.requestfacade.getcontextpath(requestfacade.java:783) ~[catalina.jar:8.0.24] @ javax.servlet.http.httpservletrequestwrapper.getcontextpath(httpservletrequestwrapper.java:150) ~[servlet-api.jar:?] @ com.mycompany.myservlet$1.modifybootstrappage(yaanservlet.java:56) ~[web-yaan-ui-base-1.3.39.jar:?]

what correct way context path in situation?

a simpler way use @javsscript annotation on ui class

package com.company.mine; @javascript({"jquery.min.js","jquery-ui.js"}) public class yourui extends ui  {  }

you need put 2 javascript files folder matching class of yourui. use maven need in src/main/resources/com/company/mine/jquery.min.js


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