#vulnerable code 
                                public void release(final boolean reportMemoryLeaks) {
        if (isReleased()) {
            return;
        }
        checkThread();
        try {
            notifyReleaseHandlers(this);
        } finally {
            releaseResources();
            shutdownExecutors(forceTerminateExecutors);
            if (executors != null) {
                executors.clear();
            }
            releaseNativeMethodDescriptors();
            synchronized (lock) {
                runtimeCounter--;
            }
            _releaseRuntime(v8RuntimePtr);
            v8RuntimePtr = 0L;
            released = true;
            if (reportMemoryLeaks && (getObjectReferenceCount() > 0)) {
                throw new IllegalStateException(objectReferences + " Object(s) still exist in runtime");
            }
        }
    } 
                            #location 22 
                            #vulnerability type THREAD_SAFETY_VIOLATION
#fixed code
                                public void release(final boolean reportMemoryLeaks) {
        if (isReleased()) {
            return;
        }
        checkThread();
        try {
            notifyReleaseHandlers(this);
        } finally {
            releaseResources();
            shutdownExecutors(forceTerminateExecutors);
            if (executors != null) {
                executors.clear();
            }
            releaseNativeMethodDescriptors();
            synchronized (lock) {
                runtimeCounter--;
            }
            _releaseRuntime(v8RuntimePtr);
            v8RuntimePtr = 0L;
            released = true;
            if (reportMemoryLeaks && (getObjectReferenceCount() > 0)) {
                throw new IllegalStateException(getObjectReferenceCount() + " Object(s) still exist in runtime");
            }
        }
    }