No X11 DISPLAY variable was set, but this program performed an operation which requires it

Summary

i’m using below devfile.yaml . i have specified is a javacontainer and selenium novnc-container

schemaVersion: 2.1.0
metadata:
  name: cbfsel-repo
projects:
  - name: cbfsel-project
    git:
      checkoutFrom:
        revision: master
      remotes:
        origin: https://gitlab.myorganization/repository.git
components:
  - container:
      image: 'quay.io/devfile/universal-developer-image:ubi8-0e189d9'
      memoryLimit: 2G
      endpoints:
        - exposure: none
          name: debug
          protocol: tcp
          targetPort: 5005
        - exposure: public
          name: 8080-http
          protocol: http
          targetPort: 8080
      volumeMounts:
        - name: m2volume
          path: /home/user/.m2
    name: javacontainer
  - container:
      image: 'mycustomdockerregistry/standalone-chrome:4.1.2-20220217'
      memoryLimit: 2G
      endpoints:
        - exposure: public
          name: 4444-tcp
          protocol: tcp
          targetPort: 4444
        - exposure: public
          name: 5900-tcp
          protocol: tcp
          targetPort: 5900
        - exposure: public
          name: 7900-http
          protocol: http
          targetPort: 7900
          secure: true
      volumeMounts:
        - name: seleniumvolume
          path: /home/user/.m2
    name: seleniumcontainer
  - name: m2volume
    volume:
      size: 2G
  - name: seleniumvolume
    volume:
      size: 2G
commands:
  - exec:
      commandLine: mvn clean package -DskipTests
      component: javacontainer
      group:
        isDefault: true
        kind: build
      label: 'build project using maven'
      workingDir: '${PROJECT_SOURCE}'
    id: mvnpackage

The javaprogram in the workspace will make use of the selenium-novnc container to run tests on webpages. when i execute the javaprogram, the first page of my test appears in the selenium-novnc website, but then it fails with below error(i understand below stacktrace shows some of my classnames, but its fine).

vTAPRegression.moduledrivers.DuckduckgoDriver@41200e0c|Error: Failed in executing component |vTap_duck_Operation| |java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:566)
        at cbf.engine.BaseModuleDriver.invokeMethod(BaseModuleDriver.java:103)
        at cbf.engine.BaseModuleDriver.eval(BaseModuleDriver.java:56)
        at cbf.engine.BaseModuleDriver.perform(BaseModuleDriver.java:50)
        at cbf.engine.BaseAppDriver.perform(BaseAppDriver.java:61)
        at cbf.engine.TestCaseRunner.performComponent(TestCaseRunner.java:260)
        at cbf.engine.TestCaseRunner.access$400(TestCaseRunner.java:41)
        at cbf.engine.TestCaseRunner$4.run(TestCaseRunner.java:234)
        at cbf.engine.TestResultTracker.track(TestResultTracker.java:135)
        at cbf.engine.TestCaseRunner.runComponent(TestCaseRunner.java:229)
        at cbf.engine.TestCaseRunner$3.run(TestCaseRunner.java:168)
        at cbf.engine.TestResultTracker.track(TestResultTracker.java:135)
        at cbf.engine.TestCaseRunner.runStep(TestCaseRunner.java:160)
        at cbf.engine.TestCaseRunner$2.run(TestCaseRunner.java:139)
        at cbf.engine.TestResultTracker.track(TestResultTracker.java:135)
        at cbf.engine.TestCaseRunner.runIteration(TestCaseRunner.java:132)
        at cbf.engine.TestCaseRunner.access$200(TestCaseRunner.java:41)
        at cbf.engine.TestCaseRunner$1.run(TestCaseRunner.java:113)
        at cbf.engine.TestResultTracker.track(TestResultTracker.java:135)
        at cbf.engine.TestCaseRunner.runTestCase(TestCaseRunner.java:89)
        at cbf.engine.Engine.runTestCase(Engine.java:48)
        at cbf.engine.TestSetRunner$4.run(TestSetRunner.java:146)
        at cbf.engine.TestResultTracker.track(TestResultTracker.java:135)
        at cbf.engine.TestSetRunner.runTestInstance(TestSetRunner.java:130)
        at cbf.engine.TestSetRunner$3.run(TestSetRunner.java:107)
        at cbf.engine.TestResultTracker.track(TestResultTracker.java:135)
        at cbf.engine.TestSetRunner.runTestsetRerun(TestSetRunner.java:98)
        at cbf.engine.TestSetRunner$1.run(TestSetRunner.java:65)
        at cbf.engine.TestResultTracker.track(TestResultTracker.java:135)
        at cbf.engine.TestSetRunner.runTestSet(TestSetRunner.java:60)
        at cbf.engine.Engine.runTestSet(Engine.java:42)
        at cbf.engine.TestSetRunner.runTestSetInstance(TestSetRunner.java:183)
        at cbf.runner.MainRunner.<init>(MainRunner.java:61)
        at cbf.runner.MainRunner.main(MainRunner.java:53)
Caused by: java.awt.HeadlessException: 
No X11 DISPLAY variable was set, but this program performed an operation which requires it.
        at java.desktop/sun.awt.HeadlessToolkit.getScreenSize(HeadlessToolkit.java:186)
        at cbf.reporting.ScreenDumpManager.dumpScreen(ScreenDumpManager.java:154)
        at cbf.reporting.ScreenDumpManager.log(ScreenDumpManager.java:122)
        at cbf.engine.TestResultTracker.log(TestResultTracker.java:177)
        at cbf.engine.TestResultLogger.log(TestResultLogger.java:159)
        at cbf.engine.TestResultLogger.passed(TestResultLogger.java:86)
        at vTAPRegression.moduledrivers.DuckduckgoDriver.vTap_duck_Operation(DuckduckgoDriver.java:42)
        ... 37 more

i noticed this error Caused by: java.awt.HeadlessException: No X11 DISPLAY variable was set, but this program performed an operation which requires it. . i’m not sure how to fix this.

i tried adding export DISPLAY=:0 , export DISPLAY=localhost:0.0, export DISPLAY=:0.0 , it didn’t work

below is the operating system detail of the `java container

please let me know how to fix this problem

Relevant information

No response

[tolusha]

/cc @benoitf

[tolusha]

I tried to set environment variable within the container using export DISPLAY=0.0 and few other values, but it didnot work.

I believe it won’t work. It works only for current terminal session.

The commands mentioned above requires sudo permission

I don’t think that it is possible to install something that requires sudo rights when workspace is up and running. I recommend to build your own image on top of universal one and install there anything your need (plus set any environment variables) .