oracle/graal · error · IllegalStateException

No instance allowed

Error message

No instance allowed

What it means

Error "No instance allowed" thrown in oracle/graal.

Source

Thrown at sdk/src/org.graalvm.jniutils/src/org/graalvm/jniutils/JNI.java:81

import org.graalvm.nativeimage.c.type.CIntPointer;
import org.graalvm.nativeimage.c.type.CLongPointer;
import org.graalvm.nativeimage.c.type.CShortPointer;
import org.graalvm.nativeimage.c.type.VoidPointer;
import org.graalvm.word.PointerBase;

public final class JNI {

    public static final int JNI_OK = 0;
    public static final int JNI_ERR = -1; /* unknown error */
    public static final int JNI_EDETACHED = -2; /* thread detached from the VM */
    public static final int JNI_EVERSION = -3; /* JNI version error */
    public static final int JNI_ENOMEM = -4; /* not enough memory */
    public static final int JNI_EEXIST = -5; /* VM already created */
    public static final int JNI_EINVAL = -6; /* invalid arguments */
    public static final int JNI_VERSION_10 = 0x000a0000;

    private JNI() {
        throw new IllegalStateException("No instance allowed");
    }

    public interface JMethodID extends PointerBase {
    }

    public interface JFieldID extends PointerBase {
    }

    public interface JObject extends PointerBase {
    }

    public interface JArray extends JObject {
        int MODE_WRITE_RELEASE = 0;
        int MODE_WRITE = 1;
        int MODE_RELEASE = 2;
    }

    public interface JBooleanArray extends JArray {

View on GitHub (pinned to a66e9ccd1d)

Solutions

1. Fix the condition reported by the error: No instance allowed
2. Check the throwing call site and ensure its documented preconditions (argument values, types, environment, or configuration) are satisfied before the call.

Example fix

Validate inputs and environment so that the failing condition does not occur: No instance allowed

When it happens

Trigger: Thrown at sdk/src/org.graalvm.jniutils/src/org/graalvm/jniutils/JNI.java:81 when the library encounters an invalid state.

Common situations: Occurs when a caller violates the contract guarded by this check: No instance allowed

AI-assisted analysis of oracle/graal@a66e9ccd1d (2026-08-14). Data as JSON: /api/errors/a4054248ad975515. Report an issue: GitHub.