Examples of javax.servlet.UnavailableException

javax.servlet.UnavailableException
Thrown if a servlet is permanently or temporarily unavailable @author Rick Knowles @version $Id: UnavailableException.java,v 1.2 2006/02/28 07:32:47 rickknowles Exp $

    protected void doGet(HttpServletRequest req, HttpServletResponse res)
        throws ServletException, IOException {


        // Verify that we were not accessed using the invoker servlet
        if (req.getAttribute(Globals.INVOKED_ATTR) != null)
            throw new UnavailableException
                ("Cannot invoke CGIServlet through the invoker");


        CGIEnvironment cgiEnv = new CGIEnvironment(req, getServletContext());


        if (cgiEnv.isValid()) {

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                throw new ServletException("No resources", e);
            }
        }


        if (resources == null) {
            throw new UnavailableException("No resources");
        }


    }

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                throw new ServletException("No resources", e);
            }
        }


        if (resources == null) {
            throw new UnavailableException("No resources");
        }


    }

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        // Load the MD5 helper used to calculate signatures.
        try {
            md5Helper = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            throw new UnavailableException("No MD5");
        }


    }

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                _resourceBase=Resource.newResource(_context.getResource(URIUtil.SLASH)).addPath(rrb);
            }
            catch (Exception e) 
            {
                Log.warn(Log.EXCEPTION,e);
                throw new UnavailableException(e.toString()); 
            }
        }
        
        String rb=getInitParameter("resourceBase");
        if (rrb != null && rb != null)
            throw new  UnavailableException("resourceBase & relativeResourceBase");    
        
        if (rb!=null)
        {
            try{_resourceBase=Resource.newResource(rb);}
            catch (Exception e) 
            {
                Log.warn(Log.EXCEPTION,e);
                throw new UnavailableException(e.toString()); 
            }
        }
        
        String t=getInitParameter("cacheControl");
        if (t!=null)
            _cacheControl=new ByteArrayBuffer(t);
        
        try
        {
            if (_resourceBase==null)
                _resourceBase=Resource.newResource(_context.getResource(URIUtil.SLASH));


            String cache_type =getInitParameter("cacheType");
            int max_cache_size=getInitInt("maxCacheSize", -2);
            int max_cached_file_size=getInitInt("maxCachedFileSize", -2);
            int max_cached_files=getInitInt("maxCachedFiles", -2);


            if (cache_type==null || "nio".equals(cache_type)|| "both".equals(cache_type))
            {
                if (max_cache_size==-2 || max_cache_size>0)
                {
                    _nioCache=new NIOResourceCache(_mimeTypes);
                    if (max_cache_size>0)
                        _nioCache.setMaxCacheSize(max_cache_size);    
                    if (max_cached_file_size>=-1)
                        _nioCache.setMaxCachedFileSize(max_cached_file_size);    
                    if (max_cached_files>=-1)
                        _nioCache.setMaxCachedFiles(max_cached_files);
                    _nioCache.start();
                }
            }
            if ("bio".equals(cache_type)|| "both".equals(cache_type))
            {
                if (max_cache_size==-2 || max_cache_size>0)
                {
                    _bioCache=new ResourceCache(_mimeTypes);
                    if (max_cache_size>0)
                        _bioCache.setMaxCacheSize(max_cache_size);    
                    if (max_cached_file_size>=-1)
                        _bioCache.setMaxCachedFileSize(max_cached_file_size);    
                    if (max_cached_files>=-1)
                        _bioCache.setMaxCachedFiles(max_cached_files);
                    _bioCache.start();
                }
            }
            if (_nioCache==null)
                _bioCache=null;
           
        }
        catch (Exception e) 
        {
            Log.warn(Log.EXCEPTION,e);
            throw new UnavailableException(e.toString()); 
        }
        
        if (Log.isDebugEnabled()) Log.debug("resource base = "+_resourceBase);
    }

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            {
                request.setAttribute(ServletHandler.__J_S_ERROR_EXCEPTION_TYPE,th.getClass());
                request.setAttribute(ServletHandler.__J_S_ERROR_EXCEPTION,th);
                if (th instanceof UnavailableException)
                {
                    UnavailableException ue = (UnavailableException)th;
                    if (ue.isPermanent())
                        response.sendError(HttpServletResponse.SC_NOT_FOUND,th.getMessage());
                    else
                        response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,th.getMessage());
                }
                else

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                    try {holder.start();}
                    catch (Exception e)
                    {
                        Log.debug(e);
                        throw new UnavailableException(e.toString());
                    }
                    
                    // Check it is from an allowable classloader
                    if (!_nonContextServlets)
                    {
                        Object s=holder.getServlet();
                        
                        if (_contextHandler.getClassLoader()!=
                            s.getClass().getClassLoader())
                        {
                            try 
                            {
                                holder.stop();
                            } 
                            catch (Exception e) 
                            {
                                Log.ignore(e);
                            }
                            
                            Log.warn("Dynamic servlet "+s+
                                         " not loaded from context "+
                                         request.getContextPath());
                            throw new UnavailableException("Not in context");
                        }
                    }


                    if (_verbose)
                        Log.debug("Dynamic load '"+servlet+"' at "+path);

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    public void checkServletType ()
        throws UnavailableException
    {
        if (!javax.servlet.Servlet.class.isAssignableFrom(_class))
        {
            throw new UnavailableException("Servlet "+_class+" is not a javax.servlet.Servlet");
        }
    }

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        throws ServletException,
               UnavailableException,
               IOException
    {
        if (_class==null)
            throw new UnavailableException("Servlet Not Initialized");
        
        Servlet servlet=_servlet;
        synchronized(this)
        {
            if (_unavailable!=0 || !_initOnStartup)
            servlet=getServlet();
            if (servlet==null)
                throw new UnavailableException("Could not instantiate "+_class);
        }
        
        // Service the request
        boolean servlet_error=true;
        Principal user=null;

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     */
    public void init() throws ServletException {


        // Ensure that our ContainerServlet properties have been set
        if ((wrapper == null) || (context == null))
            throw new UnavailableException
                (sm.getString("invokerServlet.noWrapper"));


        // Set our properties from the initialization parameters
        String value = null;
        try {

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