blocks|key|331433|text|这是我如何在带有jetty应用服务器的Ubuntu+linux环境下解决服务器端图像生成的问题。它使用xvfb，但只是作为一个“库”--在服务器上没有任何额外的特殊操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|331434|apt-get+install+xvfb

//+then+on+application+server+start:

export+DISPLAY=":99"

start-stop-daemon+--start+--background+--user+jetty+--exec+"/usr/bin/sudo"+--+-u+jetty+/usr/bin/Xvfb+:99+-screen+0+1024x768x24|code-block|syntax|javascript|331435|您可以在this+SO+question中查看我的服务器端图像生成解决方案的详细信息。|offset|length|331436|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/17940329/javafx-for-server-side-image-generation^0|0|0|4|G|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Here is how I solved this problem for server-side image geneartion on Ubuntu linux environment with jetty application server. It uses xvfb but only as a "library" - without any additional special actions on server:

<pre><code>apt-get install xvfb

// then on application server start:

export DISPLAY=":99"

start-stop-daemon --start --background --user jetty --exec "/usr/bin/sudo" -- -u jetty /usr/bin/Xvfb :99 -screen 0 1024x768x24
</code></pre>

You can see the details of my server-side image generation solution in <a href="https://stackoverflow.com/questions/17940329/javafx-for-server-side-image-generation">this SO question</a>.

blocks|key|5362059|text|这是我在Mac+OS中捕获图像时遇到的一种问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5362060|我已经用以下方法解决了这个问题|5362061|static+{

++++++++System.setProperty("java.awt.headless",+"false");
}|code-block|syntax|javascript|5362062|有关参考，请参阅：Headless+environment+error+in+java.awt.Robot+class+with+MAC+OS|offset|length|5362063|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/13487025/headless-environment-error-in-java-awt-robot-class-with-mac-os^0|0|0|0|9|1Q|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

This is a kind of problem which I encountered while capturing images in Mac OS.

I have solved this issue by using 

<pre><code>static {

 System.setProperty("java.awt.headless", "false");
}
</code></pre>

See for reference : <a href="https://stackoverflow.com/questions/13487025/headless-environment-error-in-java-awt-robot-class-with-mac-os">Headless environment error in java.awt.Robot class with MAC OS</a>

blocks|key|3250465|text|戴夫不再为我工作了。虽然我不知道为什么，但我是这样做的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3250466|public+static+void+main(String[]+args)+{
++++//+to+avoid
++++//+[JRSAppKitAWT+markAppIsDaemon]:+Process+manager+already+initialized:+can't+fully+enable+headless+mode.
++++System.setProperty("javafx.macosx.embedded",+"true");
++++java.awt.Toolkit.getDefaultToolkit();
++++//+end
++++launch(args);
}|code-block|syntax|javascript|3250467|这里也指出了这一点：JavaFX+screencapture+headless+exception+on+OSX|offset|length|3250468|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/15320915/javafx-screencapture-headless-exception-on-osx^0|0|0|A|1A|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Answer by Shreyas Dave didn't work for me anymore. Though I don't know why, here is what I did:



<pre><code>public static void main(String[] args) {
 // to avoid
 // [JRSAppKitAWT markAppIsDaemon]: Process manager already initialized: can't fully enable headless mode.
 System.setProperty("javafx.macosx.embedded", "true");
 java.awt.Toolkit.getDefaultToolkit();
 // end
 launch(args);
}
</code></pre>

This was also pointed out here: <a href="https://stackoverflow.com/questions/15320915/javafx-screencapture-headless-exception-on-osx">JavaFX screencapture headless exception on OSX</a>

blocks|key|3250487|text|如果您有JavaFX应用程序的源代码，您还可以尝试使用TestFX在无头模式下运行应用程序，以控制它并截图。要在无头模式下运行您的TestFX应用程序，您必须使用以下JVM参数启动它(以启用Monocle)：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3250488|-Dtestfx.robot=glass+-Dglass.platform=Monocle+-Dmonocle.platform=Headless+-Dprism.order=sw|code-block|syntax|javascript|3250489|此外，您可能需要首先安装Monocle。有关详细信息，请参阅Headless+testing+with+JavaFx+and+TestFx。|3250490|entityMap|0|LINK|mutability|MUTABLE|url|https://wiki.openjdk.java.net/display/OpenJFX/Monocle|1|https://stackoverflow.com/questions/27403410/headless-testing-with-javafx-and-testfx^0|2N|7|0|0|0|U|13|1|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]|S|$5|N|O|P|C|$Q|T]]]]

If you have the source code of the JavaFX application you could also try to use TestFX run the application in a headless mode, to control it and to make screenshots. To run your TestFX application in headless mode you have to start it with the following JVM parameters (to enable <a href="https://wiki.openjdk.java.net/display/OpenJFX/Monocle" rel="nofollow noreferrer">Monocle</a>):

<pre><code>-Dtestfx.robot=glass -Dglass.platform=Monocle -Dmonocle.platform=Headless -Dprism.order=sw
</code></pre>

Moreover you might need to install Monocle first. See <a href="https://stackoverflow.com/questions/27403410/headless-testing-with-javafx-and-testfx">Headless testing with JavaFx and TestFx</a> for more information.

blocks|key|333629|text|我有一个应用程序，可以交互式使用(显示JavaFx对话框)，但也必须能够在没有显示的服务器上运行非交互式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|333630|即使在非交互模式中没有使用GUI元素，我们也会得到|333631|++++Caused+by:+java.lang.UnsupportedOperationException:+Unable+to+open+DISPLAY
++++at+com.sun.glass.ui.gtk.GtkApplication.<init>(GtkApplication.java:68)|code-block|syntax|javascript|333632|一旦从javafx.application.Application派生的类被实例化，就会发生这种情况，这通常是对主类执行的操作。|offset|length|style|CODE|333633|下面是我解决这个问题的方法：|333634|333635|I为{@link+AppExecution}创建了额外的类GuiAppExecution导入java.util.List；导入javafx.application.Application；导入javafx.stage.Stage；/**+*+JavaFx启动类。*/公共类GuiAppExecution扩展应用程序{+@Override+public+void+start(Stage+stage)抛出异常{+List+parameters+=+getParameters().getRaw()；AppExecution+appExecution+=+AppExecution()；appExecution.launch(parameters)；}+/**+*启动{@link+AppExecution}作为JavaFx+{@link应用程序}。**+@param+parameters程序参数*/+public+void+launchGui(String[]参数){+launch(+parameters)；}}|unordered-list-item|333636|在主类AppExecution中我创建了一个方法|333637|333638|public+void+launch(List<String>+parameters)+{|333639|为交互式和非交互式的新main方法解析参数并启动应用程序的方法如下:public+static+void+main(String[]+parameters)+{+List+parameterList+=+Arrays.asList(+parameters+)；if+(parameterList.stream().anyMatch(p+->+p.equalsIgnoreCase(BATCH_PARAMETER){+AppExecution+appExecution+=main+AppExecution()；appExecution.launch(parameterList)；}+else+{+guiAppExecution+GuiAppExecution+=+new+GuiAppExecution()；guiAppExecution.launchGui(parameters)；}}|333640|使用|333641|私有静态最终字符串BATCH_PARAMETER+=+"-batch"；|333642|作为请求非交互式执行的程序选项。|333643|由于GuiAppExecution+(从javafx.application.Application派生)未针对非交互式执行进行实例化，因此不会启动JavaFx环境。|333644|entityMap^0|0|0|0|3|U|0|0|0|T|F|0|3|C|0|0|0|19|0|B|4|6J|4|0|0|0|0|2|F|K|U|0^^$0|@$1|2|3|4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1C|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1D|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|1E|8|@$K|1F|L|1G|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|1H|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]|$1|R|3|S|5|T|7|1J|8|@$K|1K|L|1L|M|N]]|9|@]|A|$]]|$1|U|3|V|5|T|7|1M|8|@$K|1N|L|1O|M|N]]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]|$1|X|3|Y|5|6|7|1Q|8|@$K|1R|L|1S|M|N]]|9|@]|A|$]]|$1|Z|3|10|5|6|7|1T|8|@$K|1U|L|1V|M|N]|$K|1W|L|1X|M|N]]|9|@]|A|$]]|$1|11|3|12|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|13|3|14|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|15|3|16|5|6|7|20|8|@]|9|@]|A|$]]|$1|17|3|18|5|6|7|21|8|@$K|22|L|23|M|N]|$K|24|L|25|M|N]]|9|@]|A|$]]|$1|19|3|-4|5|6|7|26|8|@]|9|@]|A|$]]]|1A|$]]

I have an application that can be used interactively (displaying JavaFx dialogs) but also must be able to run non-interactive on a server without display. 
Even though no GUI element is used in non-interactive mode, we got 

<pre><code> Caused by: java.lang.UnsupportedOperationException: Unable to open DISPLAY
 at com.sun.glass.ui.gtk.GtkApplication.&lt;init&gt;(GtkApplication.java:68)
</code></pre>

This happens as soon as a class derived from <code>javafx.application.Application</code> is instantiated, which you normally do with your main class.

Here is the way I solved the problem:

<ul>
<li>I created an additional class <code>GuiAppExecution</code>: 

<pre><code>import java.util.List;

import javafx.application.Application;
import javafx.stage.Stage;

/**
 * JavaFx launch class for {@link AppExecution}.
 */
public class GuiAppExecution extends Application {

 @Override
 public void start(Stage stage) throws Exception {
 List&lt;String&gt; parameters = getParameters().getRaw();
 AppExecution appExecution = new AppExecution();
 appExecution.launch(parameters);
 }

 /**
 * Launches the {@link AppExecution} as JavaFx {@link Application}.
 *
 * @param parameters program parameters
 */
 public void launchGui(String[] parameters) {
 launch(parameters);
 }
}
</code></pre></li>
<li>In the main class <code>AppExecution</code> I created a method 
<code>public void launch(List&lt;String&gt; parameters) {</code> 
which parses the parameters and launches the application for both interactive and non-interactive execution.</li>
<li>The <code>main</code> method looks like this: 

<pre><code>public static void main(String[] parameters) {
 List&lt;String&gt; parameterList = Arrays.asList(parameters);
 if (parameterList.stream().anyMatch(p -&gt; p.equalsIgnoreCase(BATCH_PARAMETER))) {
 AppExecution appExecution = new AppExecution();
 appExecution.launch(parameterList);
 }
 else {
 GuiAppExecution guiAppExecution = new GuiAppExecution();
 guiAppExecution.launchGui(parameters);
 }
}
</code></pre>

with

<pre><code>private static final String BATCH_PARAMETER = "-batch";
</code></pre>

as the program option that request the non-interactive execution.</li>
</ul>

Since <code>GuiAppExecution</code> (which is derived from <code>javafx.application.Application</code>) is not instantiated for non-interactive execution, the JavaFx environment is not started.

Is it possible to run JavaFx in headless mode(in Java 7)? It is being used to generate images on the server but is asking for an X-Server. Does there exist something like java.awt.headless in JavaFx ?(I can't use Xvfb )

JavaFx in headless mode

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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是否可以在无头模式下运行JavaFx (在Java7中)？它被用来在服务器上生成图像，但需要一个X-Server。在JavaFx中有像java.awt.headless这样的东西吗？(我不能使用Xvfb )

问无头模式下的JavaFx
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回答 5

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