We will understand some out of box gradle jargons.
Create a file build.gradle (file name should be build.gradle)
task helloWorld << {
println 'Welcome to Gradle First Project'
}
From command prompt , move to the folder where build.gradle file resides and type following command in command prompt
gradle helloWorld
Welcome to Gradle First Project
BUILD SUCCESSFUL
Total time : 3.593 secs
// Gradle execution is displaying time and success message because as gradle runs in JVM, there fore it must be started each time we run a Gradle Build.
gradle -q helloWorld
Welcome to Gradle First Project
// using command line options of gradle will suppress messages except error messages.
We build a simple task using Gradle, although Gradle has several built-in tasks we can execute, which can be displayed using
gradle -q tasks // displays task of our project
gradle -q dependencies // displays project dependancies
gradle -q projects // display sub-projects (if any) for root project
Task name abbreviation
A fantastic feature of Gradle , which helps us to shortcut names to our tasks i.e, in our build.gradle file we have following tasks
Task #01 deleteOldDataIfAny
Task #02 getDataFromSvn
Task #03 compileData
Task #04 publishWAR
Instead of writing complete task name in gradle command line options, we can use
gradle deleteOl
gradle dODI
gradle compileD
gradle cD
Executing Multiple Tasks
gradle deleteOldDataIfAny getDataFromSvn //executing multiple tasks
Gradle GUI
gradle –gui //enable GUI mode for Gradle
Running Gradle Tasks without Execution
gradle –dry-run taskName //enable GUI mode for Gradle
Executing Gradle From Different Folders
D: Parent_Folder
|— Folder A
|— Folder B
|— GradleTask_Folder
|————|—————- build.gradle
Suppose we are standing at D:\Parent_Folder>, to execute build.gradle in GradleTask Folder we need to
gradle –project-dir GradleTask_Folder taskName //executing taskName from build.gradle inside GradleTask_Folder.
Gradle Daemon
We know that Gradle runs on JVM, and each time we invoke gradle command ( a new java virutal machine ) is started.
Gradle classes and libraries are loaded, and build is executed.
We can reduce build time , if we dont have to load JVM, Gradle Classes, libraries each time we execute a build.
gradle –daemon //starts a new Java process that will have all classes , libraries already loaded and then build is executed.
After above command if we execute gradle command again , only Build is executed