.GroovyCastException Exception when using GrettyStartTask

[rainoko]

Relevant gradle parts

...
import org.akhikhl.gretty.*

buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'org.akhikhl.gretty:gretty7-plugin:0.0.17'
}
}

apply from: 'https://raw.github.com/akhikhl/gretty/master/pluginScripts/gretty7-0.0.17.plugin'
....
task ('jettyRunForIntegrationTest', type: GrettyStartTask) {
integrationTest = true
}

Result

Exception in thread "Thread-3" org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'org.akhikhl.gretty7.ScannerManager@45b109c6' with class 'org.akhikhl.gretty7.ScannerManager' to class 'org.akhikhl.gretty.ScannerManagerBase'
at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToType(DefaultTypeTransformation.java:360)
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.castToType(ScriptBytecodeAdapter.java:599)
at org.akhikhl.gretty.GrettyStartTask.runJetty(GrettyStartTask.groovy:199)

[akhikhl]

Issue is well-reproducible, I'll try to fix it.

[akhikhl]

OK, here is the solution. Replace the line:

apply from: 'https://raw.github.com/akhikhl/gretty/master/pluginScripts/gretty7-0.0.17.plugin'

with:

apply plugin: 'gretty7'

and then error is gone.

Source of the problem seems to be the following: as soon as you include gretty-plugin twice (once in buildscript and again in "grettyX-0.0.X.plugin"), gradle gets confused and cannot load classes properly.

General recommendation:
If you use apply-from '... grettyX-0.0.X.plugin', then you don't need classpath for gretty in buildscript, since .plugin file already does it for you.
Of course, you are not obliged to use apply-from, you can do apply-plugin instead.
I'll update usage section in wiki on this.

[rainoko]

thanx for solution. but i needed to use classpath in buildscript because otherwise gradle didn't find the GrettyStartTask class at all.

[akhikhl]

Ah, I understand. Yes, when you do "apply-from", importing the package does not work. I don't know why - it looks like deficiency/bug in gradle.

The complete working solution for you:

import org.akhikhl.gretty.*

buildscript {
  repositories {
    mavenCentral()
  }
  dependencies {
    classpath 'org.akhikhl.gretty:gretty7-plugin:0.0.17'
  }
}

repositories {
  mavenCentral()
}

apply plugin: 'gretty7'

task ('jettyRunForIntegrationTest', type: GrettyStartTask) {
  integrationTest = true
}