Replace metadata with RuntimeHintsRegistrar.

Author: fniephaus

graalpy/graalpy-spring-boot-guide/README.md

@@ -472,13 +472,23 @@ This will start the application on port 8080.
 
 The [GraalVM](https://www.graalvm.org/) Native Image compilation requires metadata to properly run code that uses [dynamic proxies](https://www.graalvm.org/latest/reference-manual/native-image/metadata/#dynamic-proxy).
 
-For the case that also a native executable has to be generated, create a proxy configuration file:
+For the case that also a native executable has to be generated, add a `RuntimeHintsRegistrar`:
 
-`src/main/resources/META-INF/native-image/proxy-config.json`
-```json
-[
-  ["com.example.demo.SentimentIntensityAnalyzer"]
-]
+`src/main/java/com/example/demo/SentimentAnalysisService.java`
+```java
+// ...
+@Service
+@ImportRuntimeHints(SentimentAnalysisService.SentimentIntensityAnalyzerRuntimeHints.class)
+public class SentimentAnalysisService {
+    // ...
+    static class SentimentIntensityAnalyzerRuntimeHints implements RuntimeHintsRegistrar {
+        @Override
+        public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
+            // Register interface as proxy for Value.as().
+            hints.proxies().registerJdkProxy(SentimentIntensityAnalyzer.class);
+        }
+    }
+}
 ```
 
 ### 7.2. Generate a Native Executable with GraalVM

graalpy/graalpy-spring-boot-guide/src/main/java/com/example/demo/SentimentAnalysisService.java

@@ -6,11 +6,15 @@
 
 package com.example.demo;
 
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.RuntimeHintsRegistrar;
+import org.springframework.context.annotation.ImportRuntimeHints;
 import org.springframework.stereotype.Service;
 
 import java.util.Map;
 
 @Service
+@ImportRuntimeHints(SentimentAnalysisService.SentimentIntensityAnalyzerRuntimeHints.class)
 public class SentimentAnalysisService {
     private final SentimentIntensityAnalyzer sentimentIntensityAnalyzer;
 
@@ -25,4 +29,12 @@ public SentimentAnalysisService(GraalPyContext context) {
     public Map<String, Double> getSentimentScore(String text) {
         return sentimentIntensityAnalyzer.polarity_scores(text); // ③
     }
+
+    static class SentimentIntensityAnalyzerRuntimeHints implements RuntimeHintsRegistrar {
+        @Override
+        public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
+            // Register interface as proxy for Value.as().
+            hints.proxies().registerJdkProxy(SentimentIntensityAnalyzer.class);
+        }
+    }
 }

graalpy/graalpy-spring-boot-guide/src/main/resources/META-INF/native-image/proxy-config.json

@@ -7,12 +7,17 @@
 package com.example.demo;
 
 import com.example.demo.GraalPyContextConfiguration.GraalPyContext;
+import org.springframework.aot.hint.MemberCategory;
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.RuntimeHintsRegistrar;
+import org.springframework.context.annotation.ImportRuntimeHints;
 import org.springframework.stereotype.Service;
 
 import java.util.List;
 import java.util.stream.IntStream;
 
 @Service
+@ImportRuntimeHints(PyGalServiceMixed.PyGalServiceMixedRuntimeHints.class)
 public class PyGalServiceMixed implements PyGalService {
     private final RenderXYFunction renderXYFunction;
 
@@ -53,4 +58,15 @@ public String renderXYChart() {
         );
         return renderXYFunction.apply(title, labelDatapointEntries);
     }
+
+
+    static class PyGalServiceMixedRuntimeHints implements RuntimeHintsRegistrar {
+        @Override
+        public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
+            // Register interface as proxy for Value.as().
+            hints.proxies().registerJdkProxy(RenderXYFunction.class);
+            // Register methods of Entry for reflection so that they can be called from Python.
+            hints.reflection().registerType(Entry.class, MemberCategory.INVOKE_DECLARED_METHODS);
+        }
+    }
 }

graalpy/graalpy-spring-boot-pygal-charts/src/main/java/com/example/demo/PyGalServiceMixed.java

@@ -8,12 +8,17 @@
 
 import com.example.demo.GraalPyContextConfiguration.GraalPyContext;
 import org.graalvm.polyglot.Value;
+import org.springframework.aot.hint.MemberCategory;
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.RuntimeHintsRegistrar;
+import org.springframework.context.annotation.ImportRuntimeHints;
 import org.springframework.stereotype.Service;
 
 import java.util.stream.IntStream;
 
 
 @Service
+@ImportRuntimeHints(PyGalServicePureJava.PyGalServicePureJavaRuntimeHints.class)
 public class PyGalServicePureJava implements PyGalService {
     private final PyGal pyGalModule;
 
@@ -51,4 +56,17 @@ public String renderXYChart() {
         xyChart.add("y = -1", new int[][]{{-5, -1}, {5, -1}});
         return xyChart.render().decode();
     }
+
+    static class PyGalServicePureJavaRuntimeHints implements RuntimeHintsRegistrar {
+        @Override
+        public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
+            // Register interfaces as proxy for Value.as().
+            hints.proxies().registerJdkProxy(PyGal.class);
+            hints.proxies().registerJdkProxy(XY.class);
+            hints.proxies().registerJdkProxy(BytesIO.class);
+
+            // Provide access to title default method.
+            hints.reflection().registerType(XY.class, MemberCategory.INTROSPECT_DECLARED_METHODS);
+        }
+    }
 }

graalpy/graalpy-spring-boot-pygal-charts/src/main/java/com/example/demo/PyGalServicePureJava.java

@@ -6,6 +6,7 @@
 
 package com.example.demo;
 
+import com.example.demo.Photon.PhotonImage;
 import jakarta.annotation.PreDestroy;
 import org.graalvm.polyglot.Context;
 import org.graalvm.polyglot.Engine;
@@ -85,6 +86,7 @@ public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
             hints.resources()
                     .registerPattern("photon/*")
                     .registerPattern("daisies_fuji.jpg");
+            hints.proxies().registerJdkProxy(PhotonImage.class);
         }
     }
 }