java.awt.HeadlessException: - Raspberry Pi Forums

-

i trying enable 2-way audio communication using java servlets between rpi , windows machine. same java program works fine between 2 windows 8 machines not between rpi , window machine.it threw following exception when invoked using browser. how deal awt error? also, rpi not have mic

http status 500 -

type exception report

message

description server encountered internal error prevented fulfilling request.

exception

java.awt.headlessexception:
no x11 display variable set, program performed operation requires it.
java.awt.graphicsenvironment.checkheadless(graphicsenvironment.java:207)
java.awt.window.<init>(window.java:536)
java.awt.frame.<init>(frame.java:420)
javax.swing.jframe.<init>(jframe.java:225)
com.teqnihome.tech.client1.starter(client1.java:55)
com.teqnihome.tech.clientservlet.doget(clientservlet.java:21)
javax.servlet.http.httpservlet.service(httpservlet.java:622)
javax.servlet.http.httpservlet.service(httpservlet.java:729)
org.apache.tomcat.websocket.server.wsfilter.dofilter(wsfilter.java:52)
note full stack trace of root cause available in apache tomcat/8.0.24 logs.

you need start x via

code: select all

startx &
not matter whether real display connected or not.

ghans


raspberrypi



Comments

Post a Comment

Popular posts from this blog

invalid use of void expresion in FlexiTimer2 library

-
Image
hello, first post asking in forum patient if dont correctly   well, im trying make robot evades obstacles , uses interrupts in order distances. ive used flexitimer2 run void function each 5ms, problem whe try verify program says me there error in use of flexitimer.    code: [select] flexitimer2::set(1, 1.0/1000, rastreodistanciamin()); i copy code below, please can tell error , how solve it, ive been loking dont know do. thank you code: [select] #include <flexitimer2.h> #include <servo.h> //motor a int ena = 7; int in1=6; int in2 = 5; //motor b int in3=11; int in4=10; int enb=9; servo cabeza; //hc-sr04 device int echo = 13; int triger = 12; //it use hc-sr04 determine , return distance in front of him int calculodistancia(){   volatile int tiempo;   volatile int distancia;   digitalwrite(triger,low); /* por cuestión de estabilización del sensor*/   delaymicroseconds(5);   digitalwrite(triger, high); ...
Read more

error: a function-definition is not allowed here before '{' token

-
i'm new member. me pls code: [select] void manhinh1(){                              tempc = analogread(adc);   tempc = tempc * 0.48828125;                                          lcd.setcursor(0, 0); lcd.print("nhiet: ");                                      lcd.setcursor(7, 0); lcd.print(tempc);   lcd.setcursor(13,0); lcd.print((char)223);    lcd.setcursor(14,0); lcd.print("c");   if(max > min){     if (tempc > max)            {digitalwrite(fan, low);           lcd.setcursor(2, 1); lcd.print("lam mat.....");}     else if (tempc < min)         ...
Read more

LED Strip Code

-
i downloaded code. here have several single leds flashing music microphone. in project, instead of single rgb leds, have 5 rgb led strips. need change in code? led strip 10m supernight rgb strip cut 5 equal strips. // arduino pin numbers const int do_pin = 2; const int ao_pin = 0; int sound; int led1 = 8; int led2 = 9; int led3 = 10; int led4 = 11; int led5 = 12;   void setup() {   pinmode(do_pin, input);   pinmode(led1, output);   pinmode(led2, output);   pinmode(led3, output);   pinmode(led4, output);   pinmode(led5, output);   serial.begin(9600); }   void loop() {     if (sound > 31) {     digitalwrite(led1, high);   }     if (sound < 31) {     digitalwrite(led1, low);   }     if (sound > 35) {     digitalwrite(led2, high);   }     if (sound < 35) {     digitalwrite(led2, low);   }     if (sound > 40) { ...
Read more