I created a basic Hello World app using the http4k...

# http4k

[Shingi Chanakira]

I created a basic Hello World app using the http4k generator. I can do a gradle clean build and a jar file is generated. When I try to run the jar file, I get an error that the jar is missing a manifest file. I added a jar tag with a manifest attribute but now I'm getting class loading errors. Anyone know what I'm missing?

[dave]

are you using shadowjar? the problem will be the mime-type file I assume?

[dave]

(if you're not using shadowjar you problaby should

[Shingi Chanakira]

Yes, I'm using the shadow jar. What should I check in the mime-type file?

[dave]

if you're using shadow, you need to merge the service files

[dave]

which is pretty much putting this in your gradle file:

shadowJar {
  mergeServiceFiles()
}

[dave]

I'm actually not sure if the toolbox is generating the correct output for the shadowJar option.

[dave]

this build.gradle file has the correct magic in it: https://github.com/http4k/examples/blob/64d641bbb8c87d4a2e53f1948ace5dc9413b5e7b/graalvm/build.gradle

[Shingi Chanakira]

Thanks, let me check it

[dave]

(I've located the bug in the toolbox which you hit by the way - when you selected the shadowJar option it didn't actually select it - fixing it now! 🙂 )

[Shingi Chanakira]

Cool, thanks

[Ben Brodie]

Another option is to use gradle install and then you’ll have a script you can run at build/install/myapp/bin/myapp

[Ben Brodie]

I believe you get this for free with the application plugin

[dave]

yeah - the shadowjar is a convienient way of bundling stuff, but it really depends on how the service is going to be started in the target environment - if it's going to be java -jar XYZ or a docker container where you can call a script.