Vertx reload hotswap

[Micah Smith]

I'm trying to achieve hotswap functionality to speed up development.

I started using the vertx-reload plugin below, which relies on dcevm to hotswap classes.

https://github.com/bangroot/vertx-reload

My problem is, I can't figure out how to pass in my config.json.  I have to use gradle for this project and am still new to it. Is this possible? If not, what gradle setups are people using for hotswap in vertx?

[Clement Escoffier]

Hi,

There is a redeploy feature provided by the default vert.x launcher:

http://vertx.io/docs/vertx-core/java/#_live_redeploy

So, for gradle, it should works as follow:

# build your project

./gradlew shadowJar

# launch your application in redeploy mode

java -jar build/libs/gradle-verticle-3.2.0-fat.jar --redeploy="src/**/*.java" --on-redeploy='./gradlew shadowJar’

The on-redeploy is the command rebuilding your project.

Clement

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[Micah Smith]

Thanks for this! Ive checked out the documentation and am able to get it working in Intellij, but not gradle. Heres what my Intellij app config looks like:
Main class: io.vertx.core.Launcher

Program arguments: run com.postsurge.web.MainVerticle  --redeploy=**/*.class --launcher-class=io.vertx.core.Launcher

My gradle looks like this:

mainClassName = "io.vertx.core.Launcher"
shadowJar {
    classifier = 'fat'

    manifest {
        attributes "Main-Verticle": mainVerticle
    }

    mergeServiceFiles {
        include 'META-INF/services/io.vertx.core.spi.VerticleFactory'
    }
}

and as you instructed i run:

./gradlew shadowJar

java -jar build/libs/web-fat.jar --redeploy="src/**/*.java" --on-redeploy="./gradlew shadowJar"

The file watcher is working as I receive this output upon saving a file. If i should see the "gradlew shadowJar" ouput, i am not:

INFO: Succeeded in deploying verticle

Dec 22, 2015 2:13:41 PM io.vertx.core.impl.launcher.commands.Watcher

INFO: Redeploying!

Stopping vert.x application 'bc4b94c5-7495-4d5d-adf2-3fa66fbb0553-redeploy'

Application 'bc4b94c5-7495-4d5d-adf2-3fa66fbb0553-redeploy' stopped.

Starting vert.x application...

bc4b94c5-7495-4d5d-adf2-3fa66fbb0553-redeploy

Dec 22, 2015 2:13:41 PM io.vertx.core.impl.launcher.commands.Watcher

INFO: Redeployment done

Dec 22, 2015 2:13:41 PM io.vertx.core.impl.launcher.commands.VertxIsolatedDeployer

INFO: Succeeded in deploying verticle

Any thoughts?

[Clement Escoffier]

Hi,

Are you using 3.2.0 ?

Clement

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[Micah Smith]

Nope, I sure wasn't. I upgraded to 3.2.0 and it appears to work now. :)    Thanks for all the help and Merry Christmas/Happy Holidays!