Deploy WAR to Apache Tomcat: Content Encoding Error

[asmbit]

I'm not able to run the grailszk-example within a Tomcat Application Container as described in https://docs.grails.org/4.0.0/guide/deployment.html#deploymentContainer.

[maiconandsilva]

Do you have any Stacktrace log to show?

Any chance it might be related to this issue? (grails/grails-core#12829)

[asmbit]

"java -jar grailszk-example-0.1.war" works fine. But when i copy the same war to a Tomcat container (9.0.71) i get attached screen. Sorry. No Stracktrace log (see attached logs).

• Grails 4.0.13
• JDK 1.8.0_352
• clean Tomcat 9.0.71 or Tomcat 8.5 installation

logs.zip

[maiconandsilva]

Ok. I'll take a look at it.

[asmbit]

Hi Maicon, can i support you in some manner to resolve the issue. Thanks, Andreas

[maiconandsilva]

Hi, Andreas. Sorry it's taking too much time but I've been busy as of late. I'll solve this pressing issue as soon as I can. Although I can't give any particular date.

Also, you can try to solve this issue and make a pull request. Let me know if you are interested.

In the meantime, is it possible for you to deploy your app using the embedded tomcat? (java -jar myapp.jar)

[asmbit]

Hi Maicon, there is no pressure on time. I can wait. Till now i have no experience in grails plugin development, but if i find time i will give a try. Thanks for your feedback.

[maiconandsilva]

@asmbit, can you test your app with the lastest version?

[asmbit]

Hi @maiconandsilva, grailszk-example now works. But my application has same problem as before. I will investigate more and let you know. Thanks a lot!

[maiconandsilva]

@asmbit

Have you changed the version in your application?
How do you call the zul view in your application?

You can create an example in which I can reproduce this error to fix it.

[asmbit]

@maiconandsilva

Yes, i changed version to 3.2.3.
I call the zul view by a controller invoking "forward". See example below:

package file.upload
class Test2Controller {
	def index() {
		forward uri: '/index.zul'
	}
}

With "bootRun" everything works fine. When deploying the war in Tomcat, i get the error as described before.

Have a nice day and thanks a lot!

[asmbit]

Hi @maiconandsilva, i found a better solution instead of forward:

package file.upload
class Test2Controller {
	
	def index() {
		response.outputStream << z.wrapper(url: '/index.zul')
	}
}

For me the issue is solved. Thank you for your great readiness.

[maiconandsilva]

Oh, Thank you. I'm going to check out the issue with using forward

[maiconandsilva]

The problem is that ZK's web-fragment.xml is being loaded with the deployed war, meaning ZK's configured DHtmlLayoutServlet is being run last. The problem is that by default compress is set to true which returns a gzipped response causing encoding error. For now, there are the known workarounds below:

Adding the following solves the issue if your ZK version is 8.6.0 or later:

configurations.all {
    exclude group: "org.zkoss.zk", module: "zkwebfragment"
}

For prior versions:

• Create a file named web.xml in the WEB-INF directory of your project if it does not already exist.
• Add the metadata-complete="true" attribute to the element in the web.xml file.

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         metadata-complete="true">

</web-app>

See updated grailszk-example.

PS: There are other methods to prevent the web-fragment.xml from being loaded.

[asmbit]

Great job! Thank you :)