How can I use custom configurations with the Eclipse plugin?

I’ve followed some online information on how to setup Project Lombok ( with Gradle. My build script looks like this:

apply plugin: "java"
apply plugin: "eclipse"
  [compileJava, compileTestJava]*.options*.encoding = 'UTF-8'
  repositories {
  configurations {
    testCompileOnly { extendsFrom compileOnly }
  sourceSets {
    main {
        compileClasspath += configurations.compileOnly
    test {
        compileClasspath += configurations.compileOnly + configurations.testCompileOnly
  dependencies {
    compileOnly group: "org.projectlombok", name: "lombok", version: "0.10.1"
    // etc...

This works very well except when I generate an eclipse project (using “gradle eclipse”), the lombok jar isn’t added to eclipse’s .classpath config file.

How do I reconfigure the gradle eclipse plugin to add the “compileOnly” configuration to the eclipse .classpath file generation?

By default, the eclipse plugin uses the testRuntime configuration to generate classpath entries. Since you are defining your dependency in a custom configuration (compileOnly) the eclipse plugin does not see it. To add it to the configurations it uses to generate classpath entries, do something like the following:

eclipseClasspath {
 plusConfigurations += [ configurations.compileOnly ]