Generate JNI header file from java source file

build.gradle

@@ -1,15 +1,28 @@
 apply plugin: 'cpp'
 apply plugin: 'java'
 apply plugin: 'maven'
+apply plugin: 'eclipse'
 
-task wrapper(type: Wrapper) {
-	gradleVersion = '1.12'
+repositories {
+	maven {
+		url 'https://github.com/Boukefalos/jlibloader/raw/mvn-repo/'
+	}
+	mavenCentral()
+}
+
+dependencies {
+	compile 'java3d:j3d-core:1.3.1'
+	compile 'com.github.boukefalos:jlibloader:0.2'
 }
 
 group = 'com.github.boukefalos'
 project.archivesBaseName = 'jlibxinput'
 version = '1.0'
 
+task wrapper(type: Wrapper) {
+	gradleVersion = '1.12'
+}
+
 model {
     platforms {
 		windows_i386 {
@@ -45,6 +58,20 @@ model {
 	}
 }
 
+def jniHeadersDir = file("$buildDir/headers")
+
+task jniHeaders(dependsOn: compileJava) {
+	def outputFile = file("$jniHeadersDir/de_hardcode_jxinput_directinput_DirectInputDriver.h")
+	inputs.files sourceSets.main.output
+	outputs.file outputFile
+	exec {
+		executable org.gradle.internal.jvm.Jvm.current().getExecutable('javah')
+		args '-o', outputFile
+		args '-classpath', sourceSets.main.output.classesDir
+		args '-classpath', file("$buildDir/../bin")
+		args 'de.hardcode.jxinput.directinput.DirectInputDriver'
+	}
+}
 
 libraries {
     main {
@@ -53,7 +80,8 @@ libraries {
 	all {
         binaries.withType(SharedLibraryBinary) { binary ->
 			cppCompiler.define 'JXINPUT_EXPORTS'
-			cppCompiler.args '-Wall'
+			//cppCompiler.args '-Wall'			
+			cppCompiler.args '-I' + jniHeadersDir
 			if (targetPlatform.operatingSystem.macOsX) {
                 cppCompiler.args '-I', "/System/Library/Frameworks/JavaVM.framework/Headers"
                 linker.args '-framework', "JavaVM"
@@ -64,6 +92,9 @@ libraries {
                 cppCompiler.args "-I${org.gradle.internal.jvm.Jvm.current().javaHome}/include"
                 cppCompiler.args "-I${org.gradle.internal.jvm.Jvm.current().javaHome}/include/win32"
             }
+			tasks.withType(CppCompile) { task ->
+				task.dependsOn jniHeaders
+			}
 			lib library: 'dxguid', linkage: 'static'
 			lib library: 'dinput8', linkage: 'static'
 			lib library: 'user32', linkage: 'static'