Generate a Java class using Gradle for Java plugin

Question

I\'d like to generate a Java class using a Gradle task for a Java project, similar to how the Android plugin creates BuildConfig.java using the

Answer 1

More elegant approach is to write a Gradle Plugin.

task javaSourceGen(type: com.somecompany.gensrc.GenerateSouce) {
  //pass appropriate parameters
}
compileJava.dependsOn(javaSourceGen)

Then in the Gradle Plugin, Any Java Source generator project can be used.

For ex: https://github.com/square/javapoet or http://codemodel.java.net/

Answer 2

I wrote a gradle plugin which aims to provide a build config like the one from android tooling gradle plugin for java/groovy projects:

https://github.com/mfuerstenau/gradle-buildconfig-plugin

It's per source set, because I needed a specific version to display for different artifacts relying on two different source sets.

just apply the plugin (gradle 2.1+)

plugins {
    'de.fuerstenau.buildconfig'
}

buildConfig {
   sourceSets {
      // this is a build config for "main" source set
      main {
         // if not defined, these are the defaults
         // packageName = project.group (not specified -> de.fuerstenau.buildconfig)
         // appName = project.name
         // version = project.version

         // custom fields con also be added
         // for example:
         // buildConfigField "String" "MYSTRING" "value"
      }
      // add more or other sourceSets like "main", be aware
      // of conflicts if you use
      // them combined
   }
}

will result in a class de.fuerstenau.buildconfig.BuildConfig (package can be configured as above):

package de.fuerstenau.buildconfig;

public final class BuildConfig
{
   private BuildConfig { }
   public final String VERSION = "<whatever-version-was-configured>";
   public final String NAME = "<whatever-appName-was-configured>";
}

Two tasks will be created and added, one to generate the class, the other to compile it, they execute before "compileJava"-task and the result is added as dependency.