Gradle Incompatible Daemons HOWTO

README.md

Add the printProperties task to your build.gradle

Run from both the command-line and intellij the gradle task printProperties

> Task :printProperties
Detecting what could cause incompatible gradle daemons
Run './gradlew printProperties' from the command-line and the same task Android studio
See https://docs.gradle.org/4.5/userguide/build_environment.html
See https://docs.gradle.org/4.5/userguide/gradle_daemon.html#daemon_faq

JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home
org.gradle.java.home=null
org.gradle.jvmargs=-Xmx4g -Dfile.encoding=UTF-8 -Duser.country=DE
file.encoding=UTF-8
user.country=DE
user.language=en
java.io.tmpdir=/var/folders/4c/176bjfgn2fj9xp68ckjpz2940000gs/T/
user.variant=

If you have incompatible daemons, you should see something like this

$ ./gradlew --status
   PID STATUS   INFO
 42713 IDLE     4.5
 42195 IDLE     4.5

$  ps auxw | grep 'GradleDaemon'
jmfayard         42713   0.0  4.0 10257468 677436    ??  Ss   11:29AM   0:32.29 /Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/bin/java -Xmx4g -Dfile.encoding=UTF-8 -Duser.country=DE -Duser.language=en -Duser.variant -cp /Users/jmfayard/.gradle/wrapper/dists/gradle-4.5-all/cg9lyzfg3iwv6fa00os9gcgj4/gradle-4.5/lib/gradle-launcher-4.5.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 4.5
jmfayard         42195   0.0  8.2 10387328 1372144   ??  Ss   11:08AM   2:56.25 /Library/Java/JavaVirtualMachines/jdk1.8.0_152.jdk/Contents/Home/bin/java -Xmx4g -Dfile.encoding=UTF-8 -Duser.country=DE -Duser.language=en -Duser.variant -cp /Users/jmfayard/.gradle/wrapper/dists/gradle-4.5-all/cg9lyzfg3iwv6fa00os9gcgj4/gradle-4.5/lib/gradle-launcher-4.5.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 4.5

A big reason why the reasons are incompatible is that a different JDK is used.

This can be fixed by having the same value in the JAVA_HOME environment variable and in the Project Structure dialog

// $HOME/.bash_config
export JAVA_HOME="$(/usr/libexec/java_home -v 1.8)"

Other incompatibilities can be fixed by updating gradle.properties until the task printProperties output the same value from both android studio and intellij.

build.gradle

task printProperties {
    group = 'help'
    doLast {
        def properties = ['org.gradle.java.home', 'org.gradle.jvmargs']
        def systemProperties = ['file.encoding', 'user.country', 'user.language', 'java.io.tmpdir', 'user.variant']
        println("Detecting what could cause incompatible gradle daemons")
        println("Run './gradlew printProperties' from the command-line and the same task Android studio")
        println("See https://docs.gradle.org/4.5/userguide/build_environment.html")
        println("See https://docs.gradle.org/4.5/userguide/gradle_daemon.html#daemon_faq")
        println()
        println "JAVA_HOME=" + System.getenv("JAVA_HOME")
        properties.forEach { prop -> println(prop + "=" + project.findProperty(prop)) }
        systemProperties.forEach { prop -> println(prop + "=" + System.properties[prop]) }
    }
}

gradle.properties

org.gradle.jvmargs=-Xmx4g -Dfile.encoding=UTF-8 -Duser.country=DE
systemProp.file.encoding=UTF-8
systemProp.user.country=DE
systemProp.user.language=en

Many thanks for this invaluable task, it helped me debug the daemon differences! I've converted it to kotlin and also updated the links:

tasks.register("printProperties") {
    group = "help"
    doLast {
        val properties = listOf("org.gradle.java.home", "org.gradle.jvmargs")
        val systemProperties = listOf("file.encoding", "user.country", "user.language", "java.io.tmpdir", "user.variant")
        println("Detecting what could cause incompatible gradle daemons")
        println("Run './gradlew printProperties' from the command-line and the same task Android studio")
        println("See https://docs.gradle.org/7.5.1/userguide/build_environment.html")
        println("See https://docs.gradle.org/7.5.1/userguide/gradle_daemon.html#daemon_faq")
        println()
        println("JAVA_HOME=" + System.getenv("JAVA_HOME"))
        properties.forEach { prop -> println(prop + "=" + project.findProperty(prop)) }
        systemProperties.forEach { prop -> println(prop + "=" + System.getProperty(prop)) }
    }
}

Thanks for the snippets. I'm not expecting any further advice but just for your information, running this task from the terminal and Android Studio gave me the same output - there were no differences. Yet, I still get Starting a Gradle Daemon, 1 incompatible and 1 stopped Daemons could not be reused, use --status for details 😞