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• Ubuntu 12.04 won't boot at all for the first time

  - by user76280

  Using http://www.ubuntu.com/download/desktop/windows-installer So I tried installing Ubuntu for the first time today, and it installed all well, but then it froze at the 'Preparing to run Ubuntu for the first time...' screen. I then proceeded to restart my computer and load Ubuntu from the OS selection screen. My screen completely froze and the picture didn't even come up fully as if my video driver was not installed correctly. Are there any fixes to this problem? Would greatly appreciate it. Possible useful information: Using http://www.ubuntu.com/download/desktop/windows-installer Dual-booting with Windows

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• installing 12.04 failing

  - by Steve

  I just downloaded 12.04 burned it to a cd, and booted to into it on my last built computer. It loads a purple screen, then goes to a dos looking screen with a blinking cursor then loads the ubuntu loader. The lights go from red to white and finally they all turn red. This is when the entire screen goes to noise and just hangs. Seems like a hardware issue but I can successfully boot into a non genuine windows7 that I'm looking to replace. I'm not sure what to try, so any help would be appreciated. Thanks.

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• Ubuntu hangs at the '_' prompt for 15' when booting. Do I need another driver for my Intel G31/G33 integrated graphics?

  - by Doctoa

  I have an ASROCK which uses Intel G31 graphics. Ubuntu says my graphics chipset is G33. Should I look for another driver or are they from the same family? I am also having problems booting and that purple screen stuck so for this I asked this question. I have partially fixed the purple screen stuck by enabling (uncommenting) this line in grub: GRUB_TERMINAL=console But Ubuntu still hangs at start up for about 15 minutes with a black screen and only the '_' prompt. Here is a link for an overview of my ASROCK G31M-S

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• When I boot it says "No any drive found" and turns off after upgrade from 9.10 to 10.04

  - by user797582

  I did an upgrade on the weekend from Ubuntu 9.10 to 10.04 (karmic to lucid). Now, when I restart my computer, it goes through the regular load screen showing my P5K Asus motherboard, just like before but instead of showing the Ubuntu load screen, it tries to start grub but fails and then says "No any drive found" and the screen goes black. I've tried changing the drive configuration in the BIOS to AHCI or RAID and that didn't work. I've tried disabling JMICRON but to no avail. I'm running out of options here. Any advice?

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• How to improve battery life on a HP Pavilion dv6?

  - by user1793249

  I apologise if this question is too similar to the numerous others already asked, but I'm a beginner and I really need your help. So...I've installed Ubuntu 12.10 a few days ago and I have only been able to get up to one hour of battery life. When running Windows 7 I get up to 3-4 hours. My screen is ultra bright, even tough the screen brightness is set to the minimum (I installed xcalib to dim my screen, but it doesn't improve the battery life) I read about Jupiter and installed it, but it doesn't have a noticeable effect. Thanks for your time.

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• Ubuntu 12.10 shows no launcher or menu

  - by Guy Wms

  I have 'upgraded' to Ubuntu 12.10 from a previous nice version that always worked. I have installed from a CD downloaded from this site. I start the PC (HP Pavillion zv5200) and arrive at a signon screen which has my username and "Guest". This screen shows the menu at the top with power, time, calendar, etc. So I enter my password and I am taken to a screen which only shows a wallpaper, nothing else. If I move the mouse and 'push' against the left limit I do not get a launcher app. Nothing. The only thing that works is opening a terminal (ctrl+alt+F1). I have tried several of the hot-key combinations I've read about on the site but none do anything, nothing happens. Can anyone help? Thanks very much!

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• Gnome 3.10 doesn't show login, Ubuntu 13.10

  - by TheWebs

  I use gnome as default desktop. And I recently upgrade Ubuntu to 13.10 then upgraded gnome to 3.10. Upon restarting, it brings me to the gnome log in screen (GDM) and all I see is the top banner part so like your date, music volume, option to restart, suspend or shutdown. Hitting control+alt+delete tells me gnome display manager will log out - it does but still nothing. I am on the log in screen, but there is no user to select, like there normally is or was. I can boot into safe mode and drop down to shell but I am not sure what commands I would enter to get the login screen back. I am using the gnome PPA's and the "unstable" PPA, so I expected issues, but not this - ideas?

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• Having problem to login after upgrading from 11.10 to 12.04

  - by LinuxIsMyFriend

  I just update to 12.04 from 11.10 and I get to the login screen w/o problems. When I enter my password the screen turns black and returns to the login screen half a second later. There is a related question out there which was solved by creating more space on the disk but my disks (or rather partitions) are all below 30%. I can log in as guest. I can also login at the cmd prompt (going to tty with Alt+Ctrl+F1) with my normal user credentials. When logged in as guest I can also install programs using my normal account password. There is the normal authentication error when I mistype my password so I'm also sure the password works. Any suggestions?

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• xset: unable to open display

  - by user287878

  for the longest time after about 5 minutes my screen would blank out. Now the screen will go blank after 5 minutes but then 2 seconds after that it will light up white and keep the laptop backlighting on. I didnt change any settings to my knowledge it just happened randomly after powering it on one day and has occurred since then. I wish to resort back to blanking the screen out completely since i leave this computer on all the time and its hard to sleep with a huge white light all the time. "xset dpms force off" just yeilds me ---- xset: unable to open display ""

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• Why Ubuntu always force itself to be in 1440x900 resolution?

  - by rainlover

  My screen's resolution is 1024x768 and when I installed Ubuntu it was forcefully in 1440x900. I changed it in my account and again I've to change it in another standard account. I don't know any way to change it in login screen. Also when shutting down that black screen with some commands also appears in 1440x900. I don't know why Ubuntu force itself to be in 1440x900. I want 1024x768 in whole way. I don't know whether it is required but I have Intel chipset 128 MB.

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• Migrating JSF 1.2 to 2.x resulted in java.lang.NullPointerException at com.sun.faces.config.InitFacesContext.cleanupInitMaps

  - by nudastack

  I'm in process of migrating a JSF 1.2 application to JSF 2.x. My application is using the following APIs: maven-jetty-plugin (version 6.1.10) maven-compiler-plugin (version 2.3.1) myfaces-api & -impl (version 1.2.7) jsf-facelets (version 1.1.14) richfaces (version 3.3.3) javax servlet jstl (version 1.2) javax servlet-api (version 2.5) and some other plugins as well. I updated the versions in faces-config.xml file and removed Facelets 1.1.14 libs and replaced MyFaces 1.2 by JSF 2.x libs, however the application didn't work. It threw the following exception: Could not instantiate listener org.apache.myfaces.webapp.StartupServletContextListener java.lang.ClassNotFoundException: org.apache.myfaces.webapp.StartupServletContextListener at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:50) at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:244) at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:230) at org.mortbay.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:375) at org.mortbay.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:337) at org.mortbay.jetty.handler.ContextHandler.loadClass(ContextHandler.java:1035) at org.mortbay.jetty.webapp.WebXmlConfiguration.initListener(WebXmlConfiguration.java:629) at org.mortbay.jetty.webapp.WebXmlConfiguration.initWebXmlElement(WebXmlConfiguration.java:367) at org.mortbay.jetty.plus.webapp.AbstractConfiguration.initWebXmlElement(AbstractConfiguration.java:190) at org.mortbay.jetty.webapp.WebXmlConfiguration.initialize(WebXmlConfiguration.java:289) at org.mortbay.jetty.plus.webapp.AbstractConfiguration.initialize(AbstractConfiguration.java:133) at org.mortbay.jetty.webapp.WebXmlConfiguration.configure(WebXmlConfiguration.java:222) at org.mortbay.jetty.plus.webapp.AbstractConfiguration.configure(AbstractConfiguration.java:113) at org.mortbay.jetty.webapp.WebXmlConfiguration.configureWebApp(WebXmlConfiguration.java:180) at org.mortbay.jetty.plus.webapp.AbstractConfiguration.configureWebApp(AbstractConfiguration.java:96) at org.mortbay.jetty.plus.webapp.Configuration.configureWebApp(Configuration.java:124) at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1217) at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:510) at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448) at org.mortbay.jetty.plugin.Jetty6PluginWebAppContext.doStart(Jetty6PluginWebAppContext.java:110) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152) at org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) at org.mortbay.jetty.Server.doStart(Server.java:222) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.plugin.Jetty6PluginServer.start(Jetty6PluginServer.java:132) at org.mortbay.jetty.plugin.AbstractJettyMojo.startJetty(AbstractJettyMojo.java:371) at org.mortbay.jetty.plugin.AbstractJettyMojo.execute(AbstractJettyMojo.java:307) at org.mortbay.jetty.plugin.AbstractJettyRunMojo.execute(AbstractJettyRunMojo.java:203) at org.mortbay.jetty.plugin.Jetty6RunMojo.execute(Jetty6RunMojo.java:184) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59) at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196) at org.apache.maven.cli.MavenCli.main(MavenCli.java:141) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352) at org.codehaus.classworlds.Launcher.main(Launcher.java:47) 2013-07-02 14:39:15.590::WARN: Unknown realm: default 2013-07-02 14:39:15.651::INFO: No Transaction manager found - if your webapp requires one, please configure one. SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". SLF4J: Defaulting to no-operation (NOP) logger implementation SLF4J: See StaticLoggerBinder for further details. Tem 02, 2013 2:39:22 PM com.sun.faces.config.ConfigureListener contextInitialized INFO: Initializing Mojarra 2.2.0 ( 20130502-2118 https://svn.java.net/svn/mojarra~svn/tags/2.2.0@11930) for context '' Tem 02, 2013 2:39:22 PM com.sun.faces.config.ConfigureListener contextInitialized WARNING: JSF1059: WARNING! The com.sun.faces.verifyObjects feature is to aid developers not using tools. It shouldn''t be enabled if using an IDE, or if this application is being deployed for production as it will impact application start times. log4j:WARN No appenders could be found for logger (org.ajax4jsf.renderkit.ChameleonRenderKitFactory). log4j:WARN Please initialize the log4j system properly. log4j:WARN See #noconfig for more info. Tem 02, 2013 2:39:26 PM com.sun.faces.config.ConfigureListener contextInitialized SEVERE: Critical error during deployment: java.lang.NoSuchMethodError: org.mortbay.jetty.annotations.AnnotationParser.parseAnnotations(Lorg/mortbay/jetty/webapp/WebAppContext;Ljava/lang/Class;Lorg/mortbay/jetty/plus/annotation/RunAsCollection;Lorg/mortbay/jetty/plus/annotation/InjectionCollection;Lorg/mortbay/jetty/plus/annotation/LifeCycleCallbackCollection;)V at com.sun.faces.vendor.Jetty6InjectionProvider.inject(Jetty6InjectionProvider.java:93) at javax.faces.FactoryFinder.getImplGivenPreviousImpl(FactoryFinder.java:695) at javax.faces.FactoryFinder.getImplementationInstance(FactoryFinder.java:572) at javax.faces.FactoryFinder.access$500(FactoryFinder.java:140) at javax.faces.FactoryFinder$FactoryManager.getFactory(FactoryFinder.java:1120) at javax.faces.FactoryFinder.getFactory(FactoryFinder.java:379) at com.sun.faces.config.processor.FactoryConfigProcessor.verifyFactoriesExist(FactoryConfigProcessor.java:328) at com.sun.faces.config.processor.FactoryConfigProcessor.process(FactoryConfigProcessor.java:236) at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:435) at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:214) at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:540) at org.mortbay.jetty.servlet.Context.startContext(Context.java:135) at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1220) at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:510) at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448) at org.mortbay.jetty.plugin.Jetty6PluginWebAppContext.doStart(Jetty6PluginWebAppContext.java:110) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152) at org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) at org.mortbay.jetty.Server.doStart(Server.java:222) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.plugin.Jetty6PluginServer.start(Jetty6PluginServer.java:132) at org.mortbay.jetty.plugin.AbstractJettyMojo.startJetty(AbstractJettyMojo.java:371) at org.mortbay.jetty.plugin.AbstractJettyMojo.execute(AbstractJettyMojo.java:307) at org.mortbay.jetty.plugin.AbstractJettyRunMojo.execute(AbstractJettyRunMojo.java:203) at org.mortbay.jetty.plugin.Jetty6RunMojo.execute(Jetty6RunMojo.java:184) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59) at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196) at org.apache.maven.cli.MavenCli.main(MavenCli.java:141) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352) at org.codehaus.classworlds.Launcher.main(Launcher.java:47) 2013-07-02 14:39:26.652::WARN: Failed startup of context org.mortbay.jetty.plugin.Jetty6PluginWebAppContext@64dacd55{/,C:\Users\zmn\workspace\tracker-web\src\main\webapp} java.lang.RuntimeException: java.lang.NoSuchMethodError: org.mortbay.jetty.annotations.AnnotationParser.parseAnnotations(Lorg/mortbay/jetty/webapp/WebAppContext;Ljava/lang/Class;Lorg/mortbay/jetty/plus/annotation/RunAsCollection;Lorg/mortbay/jetty/plus/annotation/InjectionCollection;Lorg/mortbay/jetty/plus/annotation/LifeCycleCallbackCollection;)V at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:273) at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:540) at org.mortbay.jetty.servlet.Context.startContext(Context.java:135) at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1220) at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:510) at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448) at org.mortbay.jetty.plugin.Jetty6PluginWebAppContext.doStart(Jetty6PluginWebAppContext.java:110) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152) at org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) at org.mortbay.jetty.Server.doStart(Server.java:222) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.plugin.Jetty6PluginServer.start(Jetty6PluginServer.java:132) at org.mortbay.jetty.plugin.AbstractJettyMojo.startJetty(AbstractJettyMojo.java:371) at org.mortbay.jetty.plugin.AbstractJettyMojo.execute(AbstractJettyMojo.java:307) at org.mortbay.jetty.plugin.AbstractJettyRunMojo.execute(AbstractJettyRunMojo.java:203) at org.mortbay.jetty.plugin.Jetty6RunMojo.execute(Jetty6RunMojo.java:184) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59) at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196) at org.apache.maven.cli.MavenCli.main(MavenCli.java:141) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352) at org.codehaus.classworlds.Launcher.main(Launcher.java:47) Caused by: java.lang.NoSuchMethodError: org.mortbay.jetty.annotations.AnnotationParser.parseAnnotations(Lorg/mortbay/jetty/webapp/WebAppContext;Ljava/lang/Class;Lorg/mortbay/jetty/plus/annotation/RunAsCollection;Lorg/mortbay/jetty/plus/annotation/InjectionCollection;Lorg/mortbay/jetty/plus/annotation/LifeCycleCallbackCollection;)V at com.sun.faces.vendor.Jetty6InjectionProvider.inject(Jetty6InjectionProvider.java:93) at javax.faces.FactoryFinder.getImplGivenPreviousImpl(FactoryFinder.java:695) at javax.faces.FactoryFinder.getImplementationInstance(FactoryFinder.java:572) at javax.faces.FactoryFinder.access$500(FactoryFinder.java:140) at javax.faces.FactoryFinder$FactoryManager.getFactory(FactoryFinder.java:1120) at javax.faces.FactoryFinder.getFactory(FactoryFinder.java:379) at com.sun.faces.config.processor.FactoryConfigProcessor.verifyFactoriesExist(FactoryConfigProcessor.java:328) at com.sun.faces.config.processor.FactoryConfigProcessor.process(FactoryConfigProcessor.java:236) at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:435) at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:214) ... 42 more How is this caused and how can I solve it? Here is the web.xml content: <context-param> <param-name>log4jConfigLocation</param-name> <param-value>WEB-INF/log4j.properties</param-value> </context-param> <welcome-file-list> <welcome-file>portal/html/index.xhtml</welcome-file> </welcome-file-list> <context-param> <param-name>org.apache.myfaces.ERROR_HANDLING</param-name> <param-value>false</param-value> </context-param> <context-param> <param-name>javax.faces.DEFAULT_SUFFIX</param-name> <param-value>.xhtml</param-value> </context-param> <!-- Special Debug Output for Development --> <context-param> <param-name>facelets.DEVELOPMENT</param-name> <param-value>false</param-value> </context-param> <context-param> <param-name>facelets.REFRESH_PERIOD</param-name> <param-value>2</param-value> </context-param> <context-param> <param-name>com.sun.faces.validateXml</param-name> <param-value>true</param-value> </context-param> <context-param> <param-name>com.sun.faces.verifyObjects</param-name> <param-value>true</param-value> </context-param> <context-param> <param-name>javax.faces.DATETIMECONVERTER_DEFAULT_TIMEZONE_IS_SYSTEM_TIMEZONE</param-name> <param-value>true</param-value> </context-param> <!-- Richfaces --> <context-param> <param-name>javax.faces.STATE_SAVING_METHOD</param-name> <param-value>server</param-value> </context-param> <context-param> <param-name>org.richfaces.SKIN</param-name> <param-value>tracker</param-value> </context-param> <!-- Richfaces end --> <context-param> <param-name>org.ajax4jsf.VIEW_HANDLERS</param-name> <param-value>com.sun.facelets.FaceletViewHandler</param-value> </context-param> <filter> <display-name>RichFaces Filter</display-name> <filter-name>richfaces</filter-name> <filter-class>org.ajax4jsf.Filter</filter-class> <init-param> <param-name>createTempFiles</param-name> <param-value>false</param-value> </init-param> <init-param> <param-name>maxRequestSize</param-name> <param-value>512000</param-value> </init-param> </filter> <filter-mapping> <filter-name>richfaces</filter-name> <servlet-name>Faces Servlet</servlet-name> <dispatcher>REQUEST</dispatcher> <dispatcher>FORWARD</dispatcher> <dispatcher>INCLUDE</dispatcher> </filter-mapping> <listener> <listener-class>org.apache.myfaces.webapp.StartupServletContextListener</listener-class> </listener> <listener> <listener-class>com.omega.src.util.InitializeListener</listener-class> </listener> <servlet> <servlet-name>Faces Servlet</servlet-name> <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>Faces Servlet</servlet-name> <url-pattern>*.xhtml</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>loginPage.xhtml</welcome-file> </welcome-file-list> <login-config> <auth-method>BASIC</auth-method> </login-config> and dependencies in pom.xml content: <dependencies> <dependency> <groupId>com.sun.faces</groupId> <artifactId>jsf-api</artifactId> <version>2.2.0</version> </dependency> <dependency> <groupId>com.sun.faces</groupId> <artifactId>jsf-impl</artifactId> <version>2.2.0</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> </dependency> <dependency> <groupId>org.richfaces.framework</groupId> <artifactId>richfaces-api</artifactId> <version>3.3.3.Final</version> </dependency> <dependency> <groupId>org.richfaces.framework</groupId> <artifactId>richfaces-impl</artifactId> <version>3.3.3.Final</version> </dependency> <dependency> <groupId>org.richfaces.ui</groupId> <artifactId>richfaces-ui</artifactId> <version>3.3.3.Final</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.16</version> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-core</artifactId> <version>3.6.8.Final</version> </dependency> <dependency> <groupId>postgresql</groupId> <artifactId>postgresql</artifactId> <version>9.1-901.jdbc4</version> </dependency> <dependency> <groupId>javassist</groupId> <artifactId>javassist</artifactId> <version>3.12.1.GA</version> </dependency> <dependency> <groupId>com.googlecode.gmaps4jsf</groupId> <artifactId>gmaps4jsf-core</artifactId> <version>1.1.4</version> </dependency> <dependency> <groupId>net.sf.jasperreports</groupId> <artifactId>jasperreports</artifactId> <version>4.5.0</version> </dependency> <dependency> <groupId>net.sourceforge.jexcelapi</groupId> <artifactId>jxl</artifactId> <version>2.6.12</version> </dependency> </dependencies>

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• Java Errors with jRuby on Rails on Google App Engine

  - by John Wang

  I followed all of the instructions so far from: http://code.google.com/p/appengine-jruby/wiki/RunningRails and http://gist.github.com/268192 Currently, I'm just trying to get to hello world. I'm getting these errors when I just run the dev_appserver.rb 238:hello-world jwang392$ dev_appserver.rb . => Booting DevAppServer => Press Ctrl-C to shutdown server => Generating configuration files 2010-04-08 09:16:51.961 java[411:1707] [Java CocoaComponent compatibility mode]: Enabled 2010-04-08 09:16:51.964 java[411:1707] [Java CocoaComponent compatibility mode]: Setting timeout for SWT to 0.100000 Apr 8, 2010 7:17:05 PM com.google.appengine.tools.development.ApiProxyLocalImpl log SEVERE: [1270754225387000] javax.servlet.ServletContext log: Warning: error application could not be initialized org.jruby.rack.RackInitializationException: no such file to load -- time from file:/Users/jwang392/hello-world/WEB-INF/lib/jruby- rack-0.9.6.jar!/jruby/rack/booter.rb:25:in `boot!' from file:/Users/jwang392/hello-world/WEB-INF/lib/jruby- rack-0.9.6.jar!/jruby/rack/boot/rack.rb:10 from file:/Users/jwang392/hello-world/WEB-INF/lib/jruby- rack-0.9.6.jar!/jruby/rack/boot/rack.rb:1:in `load' from <script>:1 at org.jruby.rack.DefaultRackApplicationFactory $4.init(DefaultRackApplicationFactory.java:169) at org.jruby.rack.DefaultRackApplicationFactory.newErrorApplication(DefaultRac kApplicationFactory.java: 118) at org.jruby.rack.DefaultRackApplicationFactory.init(DefaultRackApplicationFac tory.java: 37) at org.jruby.rack.SharedRackApplicationFactory.init(SharedRackApplicationFacto ry.java: 26) at org.jruby.rack.RackServletContextListener.contextInitialized(RackServletCon textListener.java: 40) at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java: 530) at org.mortbay.jetty.servlet.Context.startContext(Context.java:135) at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java: 1218) at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java: 500) at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java: 448) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 40) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java: 117) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 40) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java: 117) at org.mortbay.jetty.Server.doStart(Server.java:217) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 40) at com.google.appengine.tools.development.JettyContainerService.startContainer (JettyContainerService.java: 188) at com.google.appengine.tools.development.AbstractContainerService.startup(Abs tractContainerService.java: 147) at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerI mpl.java: 219) at com.google.appengine.tools.development.DevAppServerMain $StartAction.apply(DevAppServerMain.java:162) at com.google.appengine.tools.util.Parser $ParseResult.applyArgs(Parser.java:48) at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServer Main.java: 113) at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMa in.java: 89) Caused by: org.jruby.exceptions.RaiseException: no such file to load -- time at (unknown).new(file:/Users/jwang392/hello-world/WEB-INF/lib/jruby- rack-0.9.6.jar!/jruby/rack/booter.rb:25) at Kernel.require(file:/Users/jwang392/hello-world/WEB-INF/lib/jruby- rack-0.9.6.jar!/jruby/rack/booter.rb:25) at JRuby::Rack::Booter.boot!(file:/Users/jwang392/hello-world/WEB-INF/ lib/jruby-rack-0.9.6.jar!/jruby/rack/boot/rack.rb:10) at (unknown).(unknown)(file:/Users/jwang392/hello-world/WEB-INF/lib/ jruby-rack-0.9.6.jar!/jruby/rack/boot/rack.rb:1) at (unknown).(unknown)(file:/Users/jwang392/Dhello-world/WEB-INF/lib/ jruby-rack-0.9.6.jar!/jruby/rack/boot/rack.rb:1) at Kernel.load(<script>:1) at (unknown).(unknown)(:1) Apr 8, 2010 7:17:05 PM com.google.appengine.tools.development.ApiProxyLocalImpl log SEVERE: [1270754225913000] javax.servlet.ServletContext log: unable to create shared application instance org.jruby.rack.RackInitializationException: no such file to load -- time from file:/Users/jwang392/hello-world/WEB-INF/lib/jruby- rack-0.9.6.jar!/jruby/rack/booter.rb:25:in `boot!' from file:/Users/jwang392/hello-world/WEB-INF/lib/jruby- rack-0.9.6.jar!/jruby/rack/boot/rack.rb:10 from file:/Users/jwang392/hello-world/WEB-INF/lib/jruby- rack-0.9.6.jar!/jruby/rack/boot/rack.rb:1:in `load' from <script>:1 at org.jruby.rack.DefaultRackApplicationFactory $4.init(DefaultRackApplicationFactory.java:169) at org.jruby.rack.DefaultRackApplicationFactory.getApplication(DefaultRackAppl icationFactory.java: 51) at org.jruby.rack.SharedRackApplicationFactory.init(SharedRackApplicationFacto ry.java: 27) at org.jruby.rack.RackServletContextListener.contextInitialized(RackServletCon textListener.java: 40) at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java: 530) at org.mortbay.jetty.servlet.Context.startContext(Context.java:135) at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java: 1218) at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java: 500) at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java: 448) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 40) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java: 117) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 40) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java: 117) at org.mortbay.jetty.Server.doStart(Server.java:217) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 40) at com.google.appengine.tools.development.JettyContainerService.startContainer (JettyContainerService.java: 188) at com.google.appengine.tools.development.AbstractContainerService.startup(Abs tractContainerService.java: 147) at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerI mpl.java: 219) at com.google.appengine.tools.development.DevAppServerMain $StartAction.apply(DevAppServerMain.java:162) at com.google.appengine.tools.util.Parser $ParseResult.applyArgs(Parser.java:48) at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServer Main.java: 113) at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMa in.java: 89) Caused by: org.jruby.exceptions.RaiseException: no such file to load -- time at (unknown).new(file:/Users/jwang392/hello-world/WEB-INF/lib/jruby- rack-0.9.6.jar!/jruby/rack/booter.rb:25) at Kernel.require(file:/Users/jwang392/hello-world/WEB-INF/lib/jruby- rack-0.9.6.jar!/jruby/rack/booter.rb:25) at JRuby::Rack::Booter.boot!(file:/Users/jwang392/hello-world/WEB-INF/ lib/jruby-rack-0.9.6.jar!/jruby/rack/boot/rack.rb:10) at (unknown).(unknown)(file:/Users/jwang392/hello-world/WEB-INF/lib/ jruby-rack-0.9.6.jar!/jruby/rack/boot/rack.rb:1) at (unknown).(unknown)(file:/Users/jwang392/hello-world/WEB-INF/lib/ jruby-rack-0.9.6.jar!/jruby/rack/boot/rack.rb:1) at Kernel.load(<script>:1) at (unknown).(unknown)(:1) Apr 8, 2010 7:17:05 PM com.google.appengine.tools.development.ApiProxyLocalImpl log SEVERE: [1270754225915000] javax.servlet.ServletContext log: Error: application initialization failed org.jruby.rack.RackInitializationException: unable to create shared application instance at org.jruby.rack.SharedRackApplicationFactory.init(SharedRackApplicationFacto ry.java: 39) at org.jruby.rack.RackServletContextListener.contextInitialized(RackServletCon textListener.java: 40) at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java: 530) at org.mortbay.jetty.servlet.Context.startContext(Context.java:135) at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java: 1218) at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java: 500) at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java: 448) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 40) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java: 117) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 40) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java: 117) at org.mortbay.jetty.Server.doStart(Server.java:217) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java: 40) at com.google.appengine.tools.development.JettyContainerService.startContainer (JettyContainerService.java: 188) at com.google.appengine.tools.development.AbstractContainerService.startup(Abs tractContainerService.java: 147) at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerI mpl.java: 219) at com.google.appengine.tools.development.DevAppServerMain $StartAction.apply(DevAppServerMain.java:162) at com.google.appengine.tools.util.Parser $ParseResult.applyArgs(Parser.java:48) at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServer Main.java: 113) at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMa in.java: 89) Caused by: org.jruby.rack.RackInitializationException: no such file to load -- time from file:/Users/jwang392/hello-world/WEB-INF/lib/jruby- rack-0.9.6.jar!/jruby/rack/booter.rb:25:in `boot!' from file:/Users/jwang392/hello-world/WEB-INF/lib/jruby- rack-0.9.6.jar!/jruby/rack/boot/rack.rb:10 from file:/Users/jwang392/hello-world/WEB-INF/lib/jruby- rack-0.9.6.jar!/jruby/rack/boot/rack.rb:1:in `load' from <script>:1 at org.jruby.rack.DefaultRackApplicationFactory $4.init(DefaultRackApplicationFactory.java:169) at org.jruby.rack.DefaultRackApplicationFactory.getApplication(DefaultRackAppl icationFactory.java: 51) at org.jruby.rack.SharedRackApplicationFactory.init(SharedRackApplicationFacto ry.java: 27) ... 19 more Caused by: org.jruby.exceptions.RaiseException: no such file to load -- time at (unknown).new(file:/Users/jwang392/hello-world/WEB-INF/lib/jruby- rack-0.9.6.jar!/jruby/rack/booter.rb:25) at Kernel.require(file:/Users/jwang392/hello-world/WEB-INF/lib/jruby- rack-0.9.6.jar!/jruby/rack/booter.rb:25) at JRuby::Rack::Booter.boot!(file:/Users/jwang392/hello-world/WEB-INF/ lib/jruby-rack-0.9.6.jar!/jruby/rack/boot/rack.rb:10) at (unknown).(unknown)(file:/Users/jwang392/hello-world/WEB-INF/lib/ jruby-rack-0.9.6.jar!/jruby/rack/boot/rack.rb:1) at (unknown).(unknown)(file:/Users/jwang392/hello-world/WEB-INF/lib/ jruby-rack-0.9.6.jar!/jruby/rack/boot/rack.rb:1) at Kernel.load(<script>:1) at (unknown).(unknown)(:1) The server is running at http://localhost:8080/ I'm at a loss at what step I may have missed. I checked my ruby version (1.8.7) and rails version (2.3.5), gem version (1.3.6) and google-appengine-0.0.10.1 ran: sudo gem install google-appengine curl -O http://appengine-jruby.googlecode.com/hg/demos/rails2/rails2_appengine.rb ruby rails2_appengine.rb sudo gem install rails_dm_datastore sudo gem install activerecord-nulldb-adapter put this in my config.ru file: run lambda { |env| Rack::Response.new('Hello World!').finish } and finally ran $ dev_appserver.rb .

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• how to close selenium hub/grid from command prompt

  - by tejas trivedi

  I start selenium hub to start selenium grid from command prompt on port 4444. Now I start selenium RC from other command prompt. It show me error message that "selenium i s already running on port 4444. or some other service is " Now I am not able to start selenium RC. Please help me how to close /shutdown hub from command prompt.

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• Java web-app debugging not possible due to direct undeploy on debug

  - by Hendrik

  When i try to debug my webapp it starts up the tomcat server and the application, but shuts down the debugger shortly before the app gets usable. I see the debugging toolbar for a second before it vanishes again, though the app keeps running. Tomcat-log: Listening for transport dt_socket at address: 11555 23.03.2010 01:24:35 org.apache.catalina.core.AprLifecycleListener init INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: .:/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java 23.03.2010 01:24:35 org.apache.coyote.http11.Http11Protocol init INFO: Initializing Coyote HTTP/1.1 on http-8084 23.03.2010 01:24:35 org.apache.catalina.startup.Catalina load INFO: Initialization processed in 847 ms 23.03.2010 01:24:35 org.apache.catalina.core.StandardService start INFO: Starting service Catalina 23.03.2010 01:24:35 org.apache.catalina.core.StandardEngine start INFO: Starting Servlet Engine: Apache Tomcat/6.0.20 log4j:WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader). log4j:WARN Please initialize the log4j system properly. 23.03.2010 01:24:41 org.apache.coyote.http11.Http11Protocol start INFO: Starting Coyote HTTP/1.1 on http-8084 23.03.2010 01:24:41 org.apache.jk.common.ChannelSocket init INFO: JK: ajp13 listening on /0.0.0.0:8009 23.03.2010 01:24:41 org.apache.jk.server.JkMain start INFO: Jk running ID=0 time=0/78 config=null 23.03.2010 01:24:41 org.apache.catalina.startup.Catalina start INFO: Server startup in 5855 ms 23.03.2010 01:24:42 org.apache.catalina.startup.HostConfig checkResources INFO: Undeploying context [] 23.03.2010 01:24:45 org.apache.catalina.core.StandardContext start INFO: Container org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/] has already been started Debugging log: Attached JPDA debugger to localhost:11555 Checking data source definitions for missing JDBC drivers... Deploying JDBC driver to /Applications/NetBeans/apache-tomcat-6.0.20/lib/mysql-connector-java-5.1.6-bin.jar Stopping Tomcat process... Waiting for Tomcat... Tomcat server stopped. Starting Tomcat process... Waiting for Tomcat... Tomcat server started. Undeploying ... OK - Undeployed application at context path / In-place deployment at /path/to/project/dir/build/web deploy?config=file%3A%2Fvar%2Ffolders%2FZP%2FZPbqxGrbHFaUlXzAfgWV1%2B%2B%2B%2BTQ%2F-Tmp-%2Fcontext734173871283203218.xml&path=/ OK - Deployed application at context path / start?path=/ Start is in progress... OK - Started application at context path / debug-display-browser: Browsing: http://localhost:8084/ connect-client-debugger: BUILD SUCCESSFUL (total time: 18 seconds) System is Netbeans 6.8 on MacOS 10.6.2. Thank you very much, guys!

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• C Programming - My program is good enough for my assignment but I know its not good

  - by Joe

  Hi there I'm just starting an assignment for uni and it's raised a question for me. I don't understand how to return a string from a function without having a memory leak. char* trim(char* line) { int start = 0; int end = strlen(line) - 1; /* find the start position of the string */ while(isspace(line[start]) != 0) { start++; } //printf("start is %d\n", start); /* find the position end of the string */ while(isspace(line[end]) != 0) { end--; } //printf("end is %d\n", end); /* calculate string length and add 1 for the sentinel */ int len = end - start + 2; /* initialise char array to len and read in characters */ int i; char* trimmed = calloc(sizeof(char), len); for(i = 0; i < (len - 1); i++) { trimmed[i] = line[start + i]; } trimmed[len - 1] = '\0'; return trimmed; } as you can see I am returning a pointer to char which is an array. I found that if I tried to make the 'trimmed' array by something like: char trimmed[len]; then the compiler would throw up a message saying that a constant was expected on this line. I assume this meant that for some reason you can't use variables as the array length when initialising an array, although something tells me that can't be right. So instead I made my array by allocating some memory to a char pointer. I understand that this function is probably waaaaay sub-optimal for what it is trying to do, but what I really want to know is: 1. Can you normally initialise an array using a variable to declare the length like: char trimmed[len]; ? 2. If I had an array that was of that type (char trimmed[]) would it have the same return type as a pointer to char (ie char*). 3. If I make my array by callocing some memory and allocating it to a char pointer, how do I free this memory. It seems to me that once I have returned this array, I can't access it to free it as it is a local variable. Many thanks in advance Joe

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• Run Linux command as predefined user

  - by vijay.shad

  Hi all, I have created a shell script to start a server program. startup.sh start When above command will executes, it will try starts the server as adminuser. To achieve this my script has written like this. SUBIT="su - adminuser -c " SERVER_BOX_COMMAND_A="Server" ############## # Function to start cluster function start(){ $SUBIT "$SERVER_BOX_COMMAND_A" } When i execute the command it asks for password. Is there any other way to do this so, it will not ask for password.

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• Using the erlang mysql module, how is a database connection closed?

  - by Dan

  In using the erlang mysql module the exposed external functions are: %% External exports -export([start_link/5, start_link/6, start_link/7, start_link/8, start/5, start/6, start/7, start/8, connect/7, connect/8, connect/9, fetch/1, fetch/2, fetch/3, prepare/2, execute/1, execute/2, execute/3, execute/4, unprepare/1, get_prepared/1, get_prepared/2, transaction/2, transaction/3, get_result_field_info/1, get_result_rows/1, get_result_affected_rows/1, get_result_reason/1, encode/1, encode/2, asciz_binary/2 ]). From the this this, it is not apparent how to close a connection. How a connection closed?

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• How can we stop a running java process through windows cmd?

  - by Wing C. Chen

  I am a newbie in cmd, so please allow me to ask a stupid question: How can we stop a running java process through windows cmd? For example, if we start jetty(a mini web server) with the following cmd: start javaw -jar start.jar How do we find the process and stop it later? Obviously the following cmd does not work: stop javaw -jar start.jar

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• How to define a predicate as a function argument

  - by devoured elysium

  I want to be able to write something as void Start(some condition that might evaluate to either true or false) { //function will only really start if the predicate evaluates to true } I'd guess it must be something of the form: void Start(Predicate predicate) { } How can I check inside my Start function whenever the predicate evaluated to true or false? Is my use of a predicate correct? Thanks

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• How do i convert a string to a JSON object in JQuery?

  - by Rob

  I have a string in my db I want to pull into my page and convert to a json object. [ {id: 1,title: "Long Event", start: new Date(2009, 5, 6, 14, 0),end: new Date(2009, 5, 11)}, {id: 2,title: "Repeating Event", start: new Date(2009, 5, 2)}, {id: 3,title: "Meeting", start: new Date(2009, 5, 20, 9, 0)}, {id: 4,title: "Click for Facebook", start: new Date(2009, 5, 27, 16),end: new Date(2009, 5, 29), url: "http://facebook.com/"} ] How can I do this using JQuery?

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• Problem with list slice syntax in python

  - by Dingle

  The extended indexing syntax is mentioned in python's doc. slice([start], stop[, step]) Slice objects are also generated when extended indexing syntax is used. For example: a[start:stop:step] or a[start:stop, i]. See itertools.islice() for an alternate version that returns an iterator. a[start:stop:step] works as described. But what about the second one? How is it used?

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• Why do sockets not die when server dies? Why does a socket die when server is alive?

  - by Roman

  I try to play with sockets a bit. For that I wrote very simple "client" and "server" applications. Client: import java.net.*; public class client { public static void main(String[] args) throws Exception { InetAddress localhost = InetAddress.getLocalHost(); System.out.println("before"); Socket clientSideSocket = null; try { clientSideSocket = new Socket(localhost,12345,localhost,54321); } catch (ConnectException e) { System.out.println("Connection Refused"); } System.out.println("after"); if (clientSideSocket != null) { clientSideSocket.close(); } } } Server: import java.net.*; public class server { public static void main(String[] args) throws Exception { ServerSocket listener = new ServerSocket(12345); while (true) { Socket serverSideSocket = listener.accept(); System.out.println("A client-request is accepted."); } } } And I found a behavior that I cannot explain: I start a server, than I start a client. Connection is successfully established (client stops running and server is running). Then I close the server and start it again in a second. After that I start a client and it writes "Connection Refused". It seems to me that the server "remember" the old connection and does not want to open the second connection twice. But I do not understand how it is possible. Because I killed the previous server and started a new one! I do not start the server immediately after the previous one was killed (I wait like 20 seconds). In this case the server "forget" the socket from the previous server and accepts the request from the client. I start the server and then I start the client. Connection is established (server writes: "A client-request is accepted"). Then I wait a minute and start the client again. And server (which was running the whole time) accept the request again! Why? The server should not accept the request from the same client-IP and client-port but it does!

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• Unit Testing - not testable code converted to testable code

  - by imak

  I have read so many places is that if your code is not test-able that mean code is not well written. So that makes me start writing a code that is test-able and to start using some unit testing framework. With this though I start looking for some example with piece of code that is not testable and gradually converted to a testable code. I find tons of examples on unit testing but if someone can provide an example like above it probably can jump start things for me. TIA

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• Python - time.clock() vs. time.time() - accuracy?

  - by Corey Goldberg

  Which is better to use for timing in Python? time.clock() or time.time()? Which one provides more accuracy? for example: start = time.clock() ... do something elapsed = (time.clock() - start) vs. start = time.time() ... do something elapsed = (time.time() - start)

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• problem with presentModalViewController

  - by pbcoder

  If my iPad is in Landscape mode and presentModalViewController is called the view automatically turns into portrait mode. Any solutions? UIViewController * start = [[UIViewController alloc]initWithNibName:@"SecondView" bundle:nil]; start.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal; start.modalPresentationStyle = UIModalPresentationFormSheet; [self presentModalViewController:start animated:YES]; In SecondView I've already added: - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return YES; }

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