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POHow can I turn off headless graphics environment on windows7
 

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  1. POHow can I turn off headless graphics environment on windows7
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    <p>I have managed to break a working application, and cannot work out how to fix it. </p> <p>I have a java web-app which runs on "tc server" on a Windows7 box from within Eclipse (spring STS version.) </p> <p>The app will use java.awt.robot to perform a screen capture, and display the captured image on the subsequent page. </p> <p>So far so good, and I have been able to collect a bufferedImage from the screen and display it on a subsequent page within the web-app. </p> <p>And then I somehow broke the web-app, possibly be loading the Android SDK and Eclipse tools.</p> <p>Now, I am getting an exception from Robot because it cannot run in a HeadlessEnvironment. Google searches indicate that a headlessEnvironment is for running without a screen and keyboard, but I have both. The application worked previously without ever encountering the HeadlessEnvironment. </p> <p>If I debug and display the GraphicsEnvironment;</p> <pre><code> GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment(); </code></pre> <p>I get a HeadlessGraphicsEnvironment object based on a Win32GraphicsEnvironment. </p> <p>whilst:</p> <pre><code>String nm = java.security.AccessController.doPrivileged (new sun.security.action.GetPropertyAction("java.awt.graphicsenv", null)); System.out.println("java.awt.graphicsenv = " + nm); </code></pre> <p>gives </p> <pre><code>java.awt.graphicsenv = sun.awt.Win32GraphicsEnvironment </code></pre> <p>My poor upgrade to android led me to originally abandon the upgrade and reinstall the latest SpringSource toolset. This encountered the HeadlessEnvironment problem, so I have reverted back to my original version of eclipse, which now also has the same problem.</p> <p>I feel rather stuck now, and as most searches are telling me how I can turn Headless mode ON, can anyone explain how to turn headless mode back off again ?</p> <p>Many Thanks !</p> <p>&lt;------------- EDIT: Stack Trace Added ------------------------------------------------------></p> <pre><code>05-Apr-2012 18:42:51 org.apache.catalina.core.StandardWrapperValve invoke SEVERE: Servlet.service() for servlet [viewerServlet] in context with path [/WebView] threw exception [Request processing failed; nested exception is java.lang.RuntimeException: java.awt.AWTException: headless environment] with root cause java.awt.AWTException: headless environment at java.awt.Robot.&lt;init&gt;(Robot.java:75) at uk.co.fred.MSWindowsHandler.WindowHandlerUtilities.setupRobot(WindowHandlerUtilities.java:191) at uk.co.fred.MSWindowsHandler.WindowHandlerUtilities.scanWindow(WindowHandlerUtilities.java:71) at uk.co.fred.Scanner.ScanServiceImpl.scanScreenToBufferedImage(ScanServiceImpl.java:66) at uk.co.fred.viewer.controller.scan.control.ScanControlController.postPage_control_Scan(ScanControlController.java:57) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176) at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426) at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560) at javax.servlet.http.HttpServlet.service(HttpServlet.java:641) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at com.springsource.insight.collection.tcserver.request.HttpRequestOperationCollectionValve.traceNextValve(HttpRequestOperationCollectionValve.java:112) at com.springsource.insight.collection.tcserver.request.HttpRequestOperationCollectionValve.invoke(HttpRequestOperationCollectionValve.java:94) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:405) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:279) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:515) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) </code></pre>
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    1. USAndrew Thompson
    1. USuser582011
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    1. COWe need the stack trace youre seeing!
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      1. USdavidfrancis
    2. COOK, no problem. The original AWT exception was previously trapped, but I have thrown it as a runtimeException for clarity.
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