How to set system property using gradle? - gradle

Question

I was wondering if it's possible to set a system property, for a Java application, using Gradle?
I tried using gradle.properties file and defining a property as
systemProp.name = my name
but then when I try to get that property from a Java application using
System.getProperty("name")
that property is not found.
build.gradle and gradle.properties are in root folder of the project.
This is what my build.gradle looks like:
apply plugin: 'war'
apply plugin: 'appengine'
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'com.google.appengine:gradle-appengine-plugin:1.8.6'
}
}
appengine {
httpPort = 8081
}
repositories {
mavenCentral()
}
dependencies {
compile group: 'com.google.inject', name: 'guice', version: '3.0'
compile group: 'com.google.inject.extensions', name: 'guice-servlet', version: '3.0'
compile group: 'javax.servlet', name: 'servlet-api', version: '2.5'
compile group: 'org.hibernate', name: 'hibernate-entitymanager', version: '4.2.0.Final'
compile group: 'mysql', name: 'mysql-connector-java', version: '5.1.27'
compile 'com.google.protobuf:protobuf-java:2.5.0'
compile 'com.google.appengine:appengine-api-1.0-sdk:1.8.6'
compile 'com.google.template:soy:2012-12-21'
compile 'org.json:json:20090211'
}
And this is what my build.properties look like:
systemProp.firstName=Marko
systemProp.lastName=Vuksanovic
This is part of an AppEngine application and I run it using the following command:
gradle appengineRun

Answer 1

This is how I do it, setting props for Selenide test framework:
test {
systemProperty "browser", "chrome"
systemProperty "webdriver.chrome.driver", "$projectDir/drivers/chromedriver"
}

Answer 2

I just stumbled on this for use with the gradle application plugin. Add to the run task. Works great:
run {
systemProperties['MYPROP'] = '/my/prop/value'
}

Answer 3

This is what worked for me (using Kotlin DSL):
tasks.withType<JavaExec> {
systemProperty("key", "value")
}

Answer 4

The system property set in gradle.properties will be available only in JVM where Gradle is running.
From gradle-appengine-plugin documentation:
appengineRun: Starts a local development server running your project
code.
jvmFlags: The JVM flags to pass on to the local development server.
If you need your system properties to be available in app engine, which is separate JVM, you should use jvmFlags property.
Explicitly:
appengine {
jvmFlags = ['-DfirstName=Marko', '-DlastName=Vuksanovic']
}
With gradle.properties:
appengine {
jvmFlags = ['-DfirstName=$firstName', '-DlastName=$lastName']
}