added config for creating javadoc

Author: hiwayama

build.gradle

@@ -1,5 +1,8 @@
+import io.franzbecker.gradle.lombok.task.DelombokTask
+
 plugins {
     id 'java'
+    id 'io.franzbecker.gradle-lombok' version '1.14'
 }
 
 group 'com.github.hiwayama'
@@ -11,6 +14,21 @@ repositories {
     mavenCentral()
 }
 
+task delombok(type: DelombokTask, dependsOn: compileJava) {
+    ext.outputDir = file("$buildDir/delombok")
+    outputs.dir(outputDir)
+    sourceSets.main.java.srcDirs.each {
+        inputs.dir(it)
+        args(it, "-d", outputDir)
+    }
+}
+
+javadoc {
+    dependsOn delombok
+    source = delombok.outputDir
+    failOnError = false
+}
+
 dependencies {
     compile "com.fasterxml.jackson.module:jackson-module-jsonSchema:2.8.5"
     compile 'com.github.briandilley.jsonrpc4j:jsonrpc4j:1.5.3'