Added example showing how to build the executable from the main class file

.idea/misc.xml

@@ -3,6 +3,8 @@
   <component name="EntryPointsManager">
     <pattern value="com.example.GraalNativeBuild" />
     <pattern value="com.example.GraalNativeBuild" method="nativeExec" />
+    <pattern value="com.example.GraalNativeBuild" method="nativeClass" />
+    <pattern value="com.example.GraalNativeBuild" method="nativeJar" />
   </component>
   <component name="PDMPlugin">
     <option name="skipTestSources" value="false" />

README.md

@@ -8,22 +8,22 @@ Be sure to have the GraalVM `native-image` utility in your path, or set its loca
 ```console
 ./bld compile
 ```
-## Create a Java archive
+## Create the Java archive
 
 ```console
 ./bld jar
 ```
 
-## Create the native application
+## Create the native application from the Java archive
 
 ```console
-./bld native-exec
+./bld native-jar
 ```
 
-## Combine the commands
+## Create the native application from the main class
 
 ```console
-./bld compile jar native-exec
+./bld compile native-class
 ```
 
 ## Launch the application

src/bld/java/com/example/GraalNativeBuild.java

@@ -4,7 +4,7 @@ import rife.bld.BuildCommand;
 import rife.bld.Project;
 import rife.bld.extension.ExecOperation;
 
-import java.nio.file.Paths;
+import java.io.File;
 import java.util.List;
 import java.util.jar.Attributes;
 
@@ -44,8 +44,22 @@ public class GraalNativeBuild extends Project {
         new GraalNativeBuild().start(args);
     }
 
-    @BuildCommand(value = "native-exec", summary = "Builds a native executable")
+    @BuildCommand(value = "native-class", summary = "Builds a native executable")
-    public void nativeExec() throws Exception {
+    public void nativeClass() throws Exception {
+        new ExecOperation()
+                .fromProject(this)
+                .timeout(120)
+                .workDir(buildMainDirectory().getAbsolutePath())
+                // The native image options documentation can be found at:
+                // https://www.graalvm.org/22.0/reference-manual/native-image/Options/
+                .command("native-image", // use its absolute path if not found
+                        mainClass(),
+                        new File(workDirectory(), "hello").getAbsolutePath())
+                .execute();
+    }
+
+    @BuildCommand(value = "native-jar", summary = "Builds a native executable from the JAR")
+    public void nativeJar() throws Exception {
         new ExecOperation()
                 .fromProject(this)
                 .timeout(120)
@@ -53,7 +67,7 @@ public class GraalNativeBuild extends Project {
                 // https://www.graalvm.org/22.0/reference-manual/native-image/Options/
                 .command("native-image", // use its absolute path if not found
                         "-jar",
-                        Paths.get(buildDistDirectory().getAbsolutePath(), jarFileName()).toString(),
+                        new File(buildDistDirectory(), jarFileName()).toString(),
                         "hello")
                 .execute();
     }

src/main/java/com/example/GraalNativeMain.java

@@ -1,11 +1,11 @@
 package com.example;
 
 public class GraalNativeMain {
-    public String getMessage() {
-        return "Hello World!";
-    }
-
     public static void main(String[] args) {
         System.out.println(new GraalNativeMain().getMessage());
     }
+
+    public String getMessage() {
+        return "Hello World!";
+    }
 }

src/test/java/com/example/GraalNativeTest.java

@@ -2,7 +2,7 @@ package com.example;
 
 import org.junit.jupiter.api.Test;
 
-import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 
 public class GraalNativeTest {
     @Test