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 $

     */
    public void init() throws ServletException {


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


        // Verify that we were not accessed using the invoker servlet
        String servletName = getServletConfig().getServletName();
        if (servletName == null)
            servletName = "";
        if (servletName.startsWith("org.apache.catalina.INVOKER."))
            throw new UnavailableException
                (sm.getString("managerServlet.cannotInvoke"));


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

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                // Failed : Not the right type
            }
        }


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


    }

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        // Verify that we were not accessed using the invoker servlet
        String servletName = getServletConfig().getServletName();
        if (servletName == null)
            servletName = "";
        if (servletName.startsWith("org.apache.catalina.INVOKER."))
            throw new UnavailableException
                ("Cannot invoke CGIServlet through the invoker");


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

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    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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            String msg = "error while initializing Click servlet; throwing "
                         + "javax.servlet.UnavailableException";


            log(msg, e);


            throw new UnavailableException(e.toString());
        }
    }

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        if (applicationContext == null) {
            String springPath = getInitParameter(SPRING_PATH);
            if (springPath == null) {
                String msg =
                    SPRING_PATH + " servlet init parameter not defined";
                throw new UnavailableException(msg);
            }


            applicationContext = new ClassPathXmlApplicationContext(springPath);
        }

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        // Verify that we were not accessed using the invoker servlet
        String servletName = getServletConfig().getServletName();
        if (servletName == null)
            servletName = "";
        if (servletName.startsWith("org.apache.catalina.INVOKER."))
            throw new UnavailableException
                ("Cannot invoke CGIServlet through the invoker");


        boolean passShellEnvironment = false;
        
        // Set our properties from the initialization parameters

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    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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            try {
                Class actionContextClass =
                    RequestUtils.applicationClass(className);


                if (!ActionContext.class.isAssignableFrom(actionContextClass)) {
                    throw new UnavailableException("ActionContextClass " + "["
                        + className + "]"
                        + " must implement ActionContext interface.");
                }


                this.setActionContextClass(actionContextClass);
            } catch (ClassNotFoundException e) {
                throw new UnavailableException("ActionContextClass "
                    + className + " not found.");
            }
        } else {
            if (LOG.isDebugEnabled()) {
                LOG.debug("setActionContextClassName: no className specified");

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            servlet.getServletContext().setAttribute(STOP_ON_ERROR_KEY + '.'
                + config.getPrefix(),
                (this.stopOnFirstError ? Boolean.TRUE : Boolean.FALSE));
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            throw new UnavailableException(
                "Cannot load a validator resource from '" + pathnames + "'");
        }
    }

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