Unable to open GPIO export interface: Permission denied while accesing GPIO pins of Raspberry Pi

[avi...@gmail.com]

hi ,

    I am trying to operate LED which is connected to Raspberry Pi form my web browser. for this i am using Pi4j and vaadin framework for UI. i have deployed WAR file of my project in tomcat server which is running on Raspberry Pi. when i run the url on my browser I am getting the following error 

HTTP Status 500 - java.lang.RuntimeException: Unable to open GPIO export interface: Permission denied

type Exception report

message java.lang.RuntimeException: Unable to open GPIO export interface: Permission denied

description The server encountered an internal error (java.lang.RuntimeException: Unable to open GPIO export interface: Permission denied ) that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: java.lang.RuntimeException: Unable to open GPIO export interface: Permission denied

com.vaadin.server.VaadinServlet.handleServiceException(VaadinServlet.java:580)

com.vaadin.server.VaadinServlet.service(VaadinServlet.java:343)

com.vaadin.server.VaadinServlet.service(VaadinServlet.java:201)

javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

root cause

java.lang.RuntimeException: Unable to open GPIO export interface: Permission denied

com.pi4j.wiringpi.GpioUtil.export(Native Method)

com.pi4j.io.gpio.RaspiGpioProvider.export(RaspiGpioProvider.java:67)

com.pi4j.io.gpio.impl.GpioPinImpl.export(GpioPinImpl.java:165)

com.pi4j.io.gpio.impl.GpioControllerImpl.provisionPin(GpioControllerImpl.java:520)

com.pi4j.io.gpio.impl.GpioControllerImpl.provisionDigitalOutputPin(GpioControllerImpl.java:645)

com.pi4j.io.gpio.impl.GpioControllerImpl.provisionDigitalOutputPin(GpioControllerImpl.java:672)

com.pi4j.io.gpio.impl.GpioControllerImpl.provisionDigitalOutputPin(GpioControllerImpl.java:684)

com.example.raspberrypigpioexample01.Raspberrypigpioexample01UI.init(Raspberrypigpioexample01UI.java:19)

com.vaadin.ui.UI.doInit(UI.java:529)

com.vaadin.server.AbstractCommunicationManager.getBrowserDetailsUI(AbstractCommunicationManager.java:2468)

com.vaadin.server.AbstractCommunicationManager.handleBrowserDetailsRequest(AbstractCommunicationManager.java:2362)

com.vaadin.server.VaadinServlet.service(VaadinServlet.java:325)

com.vaadin.server.VaadinServlet.service(VaadinServlet.java:201)

javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.28 logs.

can any help me to solve this problem ?

[Steve Swinsburg]

Hi

What user are you running Tomcat as?

Cheers
Steve

sent from my mobile device

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[avi...@gmail.com]

i am using root