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A JJBridge library bundled with the V8 JavaScript Engine
There is a newer version: 0.4.0
package jjbridge.engine.v8;

import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import jjbridge.engine.utils.NativeLibraryLoader;
import jjbridge.engine.utils.ReferenceMonitor;
import jjbridge.engine.v8.runtime.Reference;

@SuppressWarnings("checkstyle:MissingJavadocType")
public class V8
{
    static
    {
        NativeLibraryLoader.load("V8-wrapper");
    }

    private static V8 instance;

    // Not private because mockito sucks
    protected V8()
    {
    }

    static synchronized V8 getInstance()
    {
        return instance != null ? instance : (instance = new V8());
    }

    @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD", justification = "Called by native code")
    private static void track(long runtimeHandle, Reference reference, ReferenceMonitor referenceMonitor)
    {
        /*
         We extract handle value here to avoid further references to object in lambda which will prevent garbage
         collection.
        */
        long handle = reference.handle;
        referenceMonitor.track(reference, () -> releaseReference(runtimeHandle, handle));
    }

    static native void setFlags(String flags);

    private static native void releaseReference(long runtimeHandle, long referenceHandle);

    public native long createRuntime(Object referenceMonitor, Object functionsCache, Object typeGetterCache,
                                     Object equalityCheckerCache, Object externalCache);

    public native boolean releaseRuntime(long runtimeHandle);

    public native Object getReferenceType(long runtimeHandle, long referenceHandle);

    public native Object executeScript(long runtimeHandle, String fileName, String sourceCode,
                                       Object referenceTypeGetter, Object equalityChecker);

    public native Object globalObjectReference(long runtimeHandle, Object referenceTypeGetter, Object equalityChecker);

    public native Object newValue(long runtimeHandle, Object type, Object referenceTypeGetter, Object equalityChecker);

    public native boolean equalsValue(long runtimeHandle, long firstValueHandle, long secondValueHandle);

    public native void initUndefinedValue(long runtimeHandle, long valueHandle);

    public native void initNullValue(long runtimeHandle, long valueHandle);

    public native boolean getBooleanValue(long runtimeHandle, long valueHandle);

    public native void setBooleanValue(long runtimeHandle, long valueHandle, boolean value);

    public native void initBooleanValue(long runtimeHandle, long valueHandle);

    public native int getIntegerValue(long runtimeHandle, long valueHandle);

    public native void setIntegerValue(long runtimeHandle, long valueHandle, int value);

    public native void initIntegerValue(long runtimeHandle, long valueHandle);

    public native double getDoubleValue(long runtimeHandle, long valueHandle);

    public native void setDoubleValue(long runtimeHandle, long valueHandle, double value);

    public native void initDoubleValue(long runtimeHandle, long valueHandle);

    public native String getStringValue(long runtimeHandle, long valueHandle);

    public native void setStringValue(long runtimeHandle, long valueHandle, String value);

    public native void initStringValue(long runtimeHandle, long valueHandle);

    public native Object getExternalValue(long runtimeHandle, long valueHandle);

    public native void setExternalValue(long runtimeHandle, long valueHandle, Object value);

    public native void initExternalValue(long runtimeHandle, long valueHandle);

    public native Object getObjectProperty(long runtimeHandle, long objectHandle, String property,
                                           Object referenceTypeGetter, Object equalityChecker);

    public native void setObjectProperty(long runtimeHandle, long objectHandle, String property, long valueHandle);

    public native void initObjectValue(long runtimeHandle, long valueHandle);

    public native String getDateTimeString(long runtimeHandle, long objectHandle);

    public native void setDateTime(long runtimeHandle, long objectHandle, String dateTime);

    public native void initDateTimeValue(long runtimeHandle, long valueHandle);

    public native Object invokeFunction(long runtimeHandle, long functionHandle, long receiverHandle, long[] argHandles,
                                        Object referenceTypeGetter, Object equalityChecker);

    public native Object invokeConstructor(long runtimeHandle, long functionHandle, long[] argHandles,
                                           Object referenceTypeGetter, Object equalityChecker);

    public native void setFunctionHandler(long runtimeHandle, long functionHandle, Object handler,
                                          Object referenceTypeGetter, Object equalityChecker);

    public native void initFunctionValue(long runtimeHandle, long valueHandle);

    public native int getArraySize(long runtimeHandle, long arrayHandle);

    public native Object getElementByPosition(long runtimeHandle, long arrayHandle, int position,
                                              Object referenceTypeGetter, Object equalityChecker);

    public native void setElementByPosition(long runtimeHandle, long objectHandle, int position, long valueHandle);

    public native void initArrayValue(long runtimeHandle, long valueHandle);

    public native long initInspector(long runtimeHandle, Object messageHandler);

    public native void closeInspector(long inspectorHandle);

    public native void onInspectorMessage(long inspectorHandle, String message);
}