[GR-71699][Native Image] Invoking setter MethodHandle with Boolean fails.

[christophstrobl]

Describe the Issue

Invoking a setter MethodHandle for a boolean field causes

java.lang.IllegalArgumentException: Can not set boolean field TestEntity.active to java.lang.Integer
	at org.graalvm.nativeimage.builder/com.oracle.svm.core.reflect.fieldaccessor.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:266)
	at org.graalvm.nativeimage.builder/com.oracle.svm.core.reflect.fieldaccessor.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:270)
	at org.graalvm.nativeimage.builder/com.oracle.svm.core.reflect.fieldaccessor.UnsafeBooleanFieldAccessorImpl.set(UnsafeBooleanFieldAccessorImpl.java:95)
	at org.graalvm.nativeimage.builder/com.oracle.svm.core.methodhandles.Util_java_lang_invoke_MethodHandle.invokeInternal(Target_java_lang_invoke_MethodHandle.java:207)
	at java.base@25/java.lang.invoke.MethodHandle.invokeBasic(MethodHandle.java:102)
	at org.graalvm.nativeimage.builder/com.oracle.svm.core.methodhandles.MethodHandleIntrinsicImpl.execute(MethodHandleIntrinsicImpl.java:179)
	at org.graalvm.nativeimage.builder/com.oracle.svm.core.methodhandles.Util_java_lang_invoke_MethodHandle.invokeInternal(Target_java_lang_invoke_MethodHandle.java:186)
	at java.base@25/java.lang.invoke.MethodHandle.invokeBasic(MethodHandle.java:102)
	at java.base@25/java.lang.invoke.LambdaForm$NamedFunction.invokeWithArguments(LambdaForm.java:96)
	at java.base@25/java.lang.invoke.LambdaForm.interpretName(LambdaForm.java:914)
	at java.base@25/java.lang.invoke.LambdaForm.interpretWithArguments(LambdaForm.java:891)
	at java.base@25/java.lang.invoke.MethodHandle.invokeBasic(MethodHandle.java:109)
	at java.base@25/java.lang.invoke.MethodHandle.invokeBasic(MethodHandle.java:0)
	at java.base@25/java.lang.invoke.LambdaForm$MH/sa9cc65ae.invoke_MT(LambdaForm$MH)
	at methodHandleWillFail(...)

Using the latest version of GraalVM can resolve many issues.

• I tried with the latest version of GraalVM.

GraalVM Version

openjdk version "25" 2025-09-16
OpenJDK Runtime Environment GraalVM CE 25+37.1 (build 25+37-jvmci-b01)
OpenJDK 64-Bit Server VM GraalVM CE 25+37.1 (build 25+37-jvmci-b01, mixed mode, sharing)

Operating System and Version

OSX

Troubleshooting Confirmation

• I tried the suggestions in the troubleshooting guide.

Run Command

just run the the code below from a native image.

Expected Behavior

I'd expect the field value to be set without an error.

Actual Behavior

java.lang.RuntimeException

Steps to Reproduce

MethodHandles.Lookup lookup = MethodHandles.lookup();
Field activeField = TestEntity.class.getDeclaredField("active");
activeField.setAccessible(true);
MethodHandle $active_fieldSetter = lookup.unreflectSetter(activeField);

TestEntity testEntity = new TestEntity();
$active_fieldSetter.invoke(testEntity, Boolean.TRUE);

// ...

public class TestEntity {

    private Long id;

    private boolean active;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public boolean isActive() {
        return active;
    }

    public void setActive(boolean active) {
        this.active = active;
    }
}

Reflection Metadata

{
      "type": "...TestEntity",
      "allPublicFields": true,
      "allDeclaredFields": true,
      "allPublicConstructors": true,
      "allDeclaredConstructors": true,
      "allPublicMethods": true,
      "allDeclaredMethods": true,
      "allPublicClasses": true,
      "allDeclaredClasses": true,
      "unsafeAllocated": true,
      "methods": [
        {
          "name": "getId",
          "parameterTypes": [ ]
        },
        {
          "name": "isActive",
          "parameterTypes": [ ]
        },
        {
          "name": "setActive",
          "parameterTypes": [
            "boolean"
          ]
        },
        {
          "name": "setId",
          "parameterTypes": [
            "java.lang.Long"
          ]
        }
      ]
    }

Additional Context

No response

Run-Time Log Output and Error Messages

No response

[oubidar-Abderrahim]

Hi, thank you for sharing this issue. Could you please share a complete version of a minimal reproducer to this? Thank you

[christophstrobl]

@oubidar-Abderrahim sure - https://github.com/christophstrobl/native-image-method-handle-does-not-work