Github user svenmeier commented on the issue:

    https://github.com/apache/wicket/pull/300
  
    I like to minimize the count of member variables:
    
    ```
    @Override
    public void destroy()
    {
        final Thread pageSavingThread = this.pageSavingThread;
        this.pageSavingThread = null;
        if (pageSavingThread.isAlive())
        {
                try
                {
                        pageSavingThread.join();
    
    @Override
    public void storePage(String sessionId, IManageablePage page)
    {
        if (pageSavingThread == null)
        {
                return;
        }
    ```
    
    Your boolean works fine too.


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