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Background Image of CSS is not showing

I have written a Java WebApp with Vaadin 14.8.0 and SpringBoot.
When I put the application in production mode and create a war file with the command "mvn clean package -Pproduction" and deploy it on my Wildfly, everything works normally. My CSS files are read and also activated.
However, the path I use in the css file for the background image is not found.
"background-image: url("/META-INF/resources/img/zac-bromell-QwrTnOlWAmI-unsplash.jpg");"
If I enter the path directly as url:
"http://localhost:8080/planyoureplaylist-1.0-SNAPSHOT/META-INF/resources/img/zac-bromell-QwrTnOlWAmI-unsplash.jpg"
I also get a 404 Not Found.
My css files are located in the root directory under ./frontend/styles.
My image files can be found in src/main/resources/META-INF/resources/img/.
I also looked at my WAR file with WINRAR. Since I notice that I find the image files in the directory WEB-INF\classes\META-INF\resources\img, but in the whole folder structure not my css files.
To my surprise the background image was displayed normally when I started the application not yet via an external wildfly.
In reference to the following link https://github.com/vaadin/flow/issues/11015 I understand that it is a bug of vaadin. However, since I am on Vaadin 14.8.0 and the bug should be fixed with 14.6.2 I do not understand the problem.
Gladly point out if something else is needed to solve the problem.
About help I would be very happy.
Thanks in advance

The files in META-INF/resources are published in the server root so your META-INF/resources/img/zac-bromell-QwrTnOlWAmI-unsplash.jpg file is available at img/zac-bromell-QwrTnOlWAmI-unsplash.jpg inside your context root. Your background image CSS should thus be "background-image: url("img/zac-bromell-QwrTnOlWAmI-unsplash.jpg");"

unable to find servlet(.java) files converted from jsp

I am using eclipse luna and tomcat version 7. I have written few jsp files and executing them on tomcat easily. I have read that jsps are converted into servlets at run time and you can locate them in tomcat/work/catalina/localhost/project name and further. My project name is quizilla and there exist a folder named quizilla-1.0-SNAPSHOT, but this folder is empty. What is the reason and where can i find those .java files. I have attached the screen shot of the folder as wellAs I am in right directory in search of my java files, but the folder is empty. So what should i do

You are using Tomcat from Eclipse, so the work directory is:
projectworkspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0
or something like that (if you haven't changed the Server configuration via Eclipse).

Add
<%=getClass().getResource(getClass().getSimpleName() + ".class")%>
to one of your JSP pages to detect where Tomcat has generated the servlet.

What is the exploded path of a jar downloaded by jnlp?

I have a web app. packaged as a jar file and served by Java Web Start using jnlp. When the user runs my program, it generates an excel file, which is to be shown by a web page within the same app.
The question is: where should my java class write the excel file so that the web page is able to locate/serve it? Obviously, web page can read from within the web app only (sandbox). But the only handle that I can get to the jnlp downloaded app is the jar file (which is not modifiable at runtime) and not EXPLODED jar file contents. If I am able to locate and write to the exploded jar file contents, I can write my excel file there to be picked up by the web page.
Any help? Any alternatives?

..where should my java class write the excel file so that the web page is able to locate/serve it?
Write it to a sub-directory of user.home. Either that or to the temp.dir (spelling?).
Either of those apps. should be writable be a Java app. without special permissions (e.g. running as root).

JavaFX loading images from CSS in Webstart

I currently have a major problem with loading of CSS and images in JavaFX.
The goal is to make JavaFX load the images that are defined in the CSS file. I get this to work easily in the IDE and in the standalone execution. But once I try the the application as a applet and run it inside a browser context everything fails.
The CSS file is still load properly, but the image files remain blank. Sadly I can't find a way to make JavaFX log why the image loading is failing. All the images are located in subdirectories from the location of the CSS file and are accessed for example like this:
.button-gray {
-fx-border-image-source: url("button/buttongray.png");
}
The CSS file is located in the same package as the class that handles loading it and is load like this:
final URL css = Util.class.getResource("sheet.css");
if (css != null) {
parent.getStylesheets().add(css.toExternalForm());
}
I tried already placing the resources in the root directory and load it with Util.class.getClassLoader.getResource(...) and Thread.currentThread().getContextClassLoader.getResource(...). Both worked fine in case the application was executed as stand alone. Neither worked in case the application is launched from a webstart applet context.
But as I said. In all cases there is no indication that the CSS is not load. The styles defined in the stylesheet are applied properly with exception of the images.
I am running out of idea what the reason for this is. I package and publish the application using the gradle javafx plugin by shemnon.
Building environment:
Oracle Java 1.7b45 x64
Gradle 1.9
Anyone know how to fix this problem or has any idea how to debug it.
Sadly the logging facilities of JavaFX (even the CSS Logger) and the applet trace console give no indication what the problem is.
New Information!
The JNLP file is located here:
JNLP-File
How ever, this file is not the problem. The problems seems to be the generation of the binary css file that is part of the deployment process of JavaFX for webstart. In this binary file, for some yet unknown reason there is a reference to the CSS file inside by building environment. This causes the CSS loader to load the image files from the location on my building server. Something that does not work in my local computer. Builds I did on my local computer on the other hand work because the files are still at the location its looking for.
So now the problem seems to be limited to the binary css generation that stores a entirely wrong file reference.

1) Can you post the .jnlp file that you're using to deploy the app? An incorrect .jnlp can cause resource loading issues like this.
2) Give us the exact invocation of Thread.currentThread().getContextCLassLoader.getResource("") that you're using.
3) Report the contents of the .jar file, with the exact folder/path structure of the file(s) in the jar that you need to load. For example, 'My code is looking for example.png, it should be in the pics.jar file inside the folder com/mycompany/myimages', something like that.
WebStart takes some doing to get working, but I'd suspect the answer lies in there somewhere. If all else fails, I've found JaNeLa to be helpful in debugging web start deployment problems. http://pscode.org/janela/

Have you tried loading the css file with:
final String css = getClass.getResource("sheet.css").toExternalForm();
parent.getStylesheets.add(css); // taken that parent is the name for the Scene.
For the css:
-fx-border-image-source: url("../button/buttongray.png");
Using URL and Util.class is not something that is common to use for loading stylesheets afaik.
Maybe try NetBeans IDE 7.4. Personally i don't know Gradle.

Java applet runs locally but not on the host

I have written an applet application and integrate it to run under a webpage. It runs properly when I am running the webpage as local HTML file (using file:/// protocol). But when I am running it on a host (tested with http://localhost using XAMPP), it does not work anymore and through exception of ClassNotFound.
My applet classes are packaged under a *.jar file. Is not the jar file loaded in this case? Can anyone give me a suggestion that what can I do to deal with this problem?
Update
I have uploaded the jar file into the same folder as the HTML file. In my case, they are in the DocumentRoot of the Apache server. I can double-click on the HTML file, it works.
But when I query like: localhost/test.html, it does not. My code:
<applet
code="package/ClassName.class"
archive="appletfile.jar">
</applet>
I can able load the jar file by: localhost/appletfile.jar

Html document (in which <applet/> tag is used to deploy an applet) and .jar file must be in the same folder.
<applet code ="package.AppletClassName"
archive = "Sample.jar"
width = "200"
height ="200">
</applet>

I do not know why but when I change the name of *.jar file to lowercase (all lower case), then it works.

yes!!
Applets able to run in Apache PHP server.The applet is loading from server when you called the html file the applet execute in browser and gives the out put.must and should update your java plugin before run the applet in browser.put your entire applet folder in to apache htdocs folder ,then access that applet in browser....!!It will work.I am sure..
All the Best

Only self signed applets are able to access in browser with security other wise applet not execute with security.You have to signed the applet to execute.