#vulnerable code 
                                public void release(final boolean reportMemoryLeaks) {
        if (isReleased()) {
            return;
        }
        checkThread();
        if (debugEnabled) {
            disableDebugSupport();
        }
        releaseResources();
        shutdownExecutors(forceTerminateExecutors);
        if (executors != null) {
            executors.clear();
        }
        synchronized (lock) {
            runtimeCounter--;
        }
        _releaseRuntime(v8RuntimePtr);
        v8RuntimePtr = 0L;
        released = true;
        if (reportMemoryLeaks && (objectReferences > 0)) {
            throw new IllegalStateException(objectReferences + " Object(s) still exist in runtime");
        }
    } 
                            #location 7 
                            #vulnerability type THREAD_SAFETY_VIOLATION
#fixed code
                                public void release(final boolean reportMemoryLeaks) {
        if (isReleased()) {
            return;
        }
        checkThread();
        releaseResources();
        shutdownExecutors(forceTerminateExecutors);
        if (executors != null) {
            executors.clear();
        }
        synchronized (lock) {
            runtimeCounter--;
        }
        _releaseRuntime(v8RuntimePtr);
        v8RuntimePtr = 0L;
        released = true;
        if (reportMemoryLeaks && (objectReferences > 0)) {
            throw new IllegalStateException(objectReferences + " Object(s) still exist in runtime");
        }
    }