java - NullPointerException in rest webservice upload -

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i trying upload file using rest webservice. code 

@path(value= "/up") public class upload {      @post     @path(value="upload")     @consumes(mediatype.multipart_form_data)     public response uploadfile(@formdataparam("file") inputstream fileinputstream ) {         string filepath = "c://users/marya/desktop/file" ;         system.out.println("*****serverpath********");         savefile(fileinputstream, filepath); //this line 29          system.out.println("*****save********");         string output = "file saved  server location : " + filepath;         system.out.println("done");         return response.status(200).entity(output).build();     }      private void savefile(inputstream uploadedinputstream,string serverlocation) {         try {outputstream outpustream = new fileoutputstream(new file(serverlocation));             int read = 0;             byte[] bytes = new byte[1024];             outpustream = new fileoutputstream(new file(serverlocation));             while ((read = uploadedinputstream.read(bytes)) != -1) //this lione 42             {                 outpustream.write(bytes, 0, read);                 system.out.println("*****read********");             }             outpustream.flush();             outpustream.close();         } catch (ioexception e) {             e.printstacktrace();         }     } }

when run it, file created empty size = 0 !! , error:

grave: "servlet.service()" pour la servlet jax-rs servlet généré une exception java.lang.nullpointerexception @ com.example.upload.savefile(upload.java:42) @ com.example.upload.uploadfile(upload.java:29) @ sun.reflect.nativemethodaccessorimpl.invoke0(native method) @ sun.reflect.nativemethodaccessorimpl.invoke(unknown source) @ sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source) @ java.lang.reflect.method.invoke(unknown source) @ com.sun.jersey.spi.container.javamethodinvokerfactory$1.invoke(javamethodinvokerfactory.java:60) @ com.sun.jersey.server.impl.model.method.dispatch.abstractresourcemethoddispatchprovider$responseoutinvoker._dispatch(abstractresourcemethoddispatchprovider.java:205) @ com.sun.jersey.server.impl.model.method.dispatch.resourcejavamethoddispatcher.dispatch(resourcejavamethoddispatcher.java:75) @ com.sun.jersey.server.impl.uri.rules.httpmethodrule.accept(httpmethodrule.java:302) @ com.sun.jersey.server.impl.uri.rules.righthandpathrule.accept(righthandpathrule.java:147) @ com.sun.jersey.server.impl.uri.rules.resourceclassrule.accept(resourceclassrule.java:108) @ com.sun.jersey.server.impl.uri.rules.righthandpathrule.accept(righthandpathrule.java:147) @ com.sun.jersey.server.impl.uri.rules.rootresourceclassesrule.accept(rootresourceclassesrule.java:84) @ com.sun.jersey.server.impl.application.webapplicationimpl._handlerequest(webapplicationimpl.java:1542) @ com.sun.jersey.server.impl.application.webapplicationimpl._handlerequest(webapplicationimpl.java:1473) @ com.sun.jersey.server.impl.application.webapplicationimpl.handlerequest(webapplicationimpl.java:1419) @ com.sun.jersey.server.impl.application.webapplicationimpl.handlerequest(webapplicationimpl.java:1409)

are there suggestions please solve issue ??


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