Example usage for javax.servlet UnavailableException UnavailableException

Introduction

In this page you can find the example usage for javax.servlet UnavailableException UnavailableException.

Prototype

public UnavailableException(String msg) 

Source Link

Document

Constructs a new exception with a descriptive message indicating that the servlet is permanently unavailable.

Usage

From source file:org.apache.struts.action.RegistryServlet.java

/**
 * Perform a graceful startup of this servlet instance.
 *
 * @exception ServletException if we cannot process the activity
 *  definition file for this activity/*ww  w.  ja  va2s. co  m*/
 */
public void init() throws ServletException {

    // Record the debugging detail level settings
    String debug = getServletConfig().getInitParameter("debug");
    if (debug != null) {
        try {
            this.debug = Integer.parseInt(debug);
        } catch (NumberFormatException e) {
            throw new UnavailableException("Debug initialization parameter must be an integer");
        }
    }

    // Record the attribute name for our current Context
    String contextKey = getServletConfig().getInitParameter("context-key");
    if (contextKey != null)
        setContextKey(contextKey);

    // Record the attribute name for our current Context
    String registryKey = getServletConfig().getInitParameter("registry-key");
    if (registryKey != null)
        setRegistryKey(registryKey);

    // Parse the activity definition file for our Activity
    String registryPath = getServletConfig().getInitParameter("registry");
    if (registryPath != null)
        this.registryPath = registryPath;
    parse(this.registryPath);

    // Check result of parse
    if (activity == null)
        throw new UnavailableException("No registry defined in resource " + registryPath);

}

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From source file:org.apache.struts.action.RegistryServlet.java

/**
 * Parse the specified activity definition file for this instance.
 *
 * @param path Context-relative resource path of the activity
 *  definition file// w  w  w.j  a  v a 2  s.c  om
 *
 * @exception ServletException on any processing error in parsing
 */
private void parse(String path) throws ServletException {

    // Get an input source for the specified path
    InputStream is = getServletContext().getResourceAsStream(path);
    if (is == null)
        throw new UnavailableException("Cannot access resource " + path);

    // Configure a Digester instance to parse our definition file
    Digester digester = new Digester();
    digester.setNamespaceAware(true);
    digester.setValidating(false);
    digester.push(this);

    // Add rules to recognize the built-in steps that we know about
    BaseRuleSet brs = new BaseRuleSet();
    digester.addRuleSet(brs);
    digester.addRuleSet(new CoreRuleSet());
    digester.addRuleSet(new IoRuleSet());
    digester.addRuleSet(new WebRuleSet());

    // Add a rule to register the Activity being created
    digester.setRuleNamespaceURI(brs.getNamespaceURI());
    digester.addSetNext("activity", "setActivity", "org.apache.commons.workflow.Activity");

    // Parse the activity definition file
    try {
        digester.parse(is);
    } catch (Throwable t) {
        log("Cannot parse resource " + path, t);
        throw new UnavailableException("Cannot parse resource " + path);
    } finally {
        try {
            is.close();
        } catch (Throwable u) {
            ;
        }
    }

}

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From source file:org.apache.struts.chain.ComposableRequestProcessor.java

/**
 * <p>Make sure that the specified <code>className</code> identfies a
 * class which can be found and which implements the
 * <code>ActionContext</code> interface.</p>
 *
 * @param className Fully qualified name of
 * @throws ServletException     If an error occurs during initialization
 * @throws UnavailableException if class does not implement ActionContext
 *                              or is not found
 *//* ww w  . j  a v  a  2  s . c  o m*/
private void setActionContextClassName(String className) throws ServletException {
    if ((className != null) && (className.trim().length() > 0)) {
        if (LOG.isDebugEnabled()) {
            LOG.debug("setActionContextClassName: requested context class: " + className);
        }

        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");
        }

        this.setActionContextClass(null);
    }
}

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From source file:org.apache.struts.service.factory.FactoryService.java

/**
* Initialize our internal MessageResources bundle.
*
* @exception ServletException if we cannot initialize these resources
*//*from   w  w w. java2  s  .com*/
protected void initInternal() throws Exception {

    try {
        internal = MessageResources.getMessageResources(internalName);
    } catch (MissingResourceException e) {
        log("Cannot load internal resources from '" + internalName + "'", e);
        throw new UnavailableException("Cannot load internal resources from '" + internalName + "'");
    }
}

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From source file:org.apache.struts.tiles.TilesPlugin.java

/**
 * Create FactoryConfig and initialize it from web.xml and struts-config.xml.
 *
 * @param servlet ActionServlet that is managing all the modules
 *  in this web application./*w ww .j  a  v a  2 s.  com*/
 * @param config ModuleConfig for the module with which
 *  this plugin is associated.
 * @exception ServletException if this <code>PlugIn</code> cannot
 *  be successfully initialized.
 */
protected DefinitionsFactoryConfig readFactoryConfig(ActionServlet servlet, ModuleConfig config)
        throws ServletException {

    // Create tiles definitions config object
    DefinitionsFactoryConfig factoryConfig = new DefinitionsFactoryConfig();
    // Get init parameters from web.xml files
    try {
        DefinitionsUtil.populateDefinitionsFactoryConfig(factoryConfig, servlet.getServletConfig());

    } catch (Exception ex) {
        if (log.isDebugEnabled()) {
            log.debug("", ex);
        }
        ex.printStackTrace();
        throw new UnavailableException(
                "Can't populate DefinitionsFactoryConfig class from 'web.xml': " + ex.getMessage());
    }

    // Get init parameters from struts-config.xml
    try {
        Map strutsProperties = findStrutsPlugInConfigProperties(servlet, config);
        factoryConfig.populate(strutsProperties);

    } catch (Exception ex) {
        if (log.isDebugEnabled()) {
            log.debug("", ex);
        }

        throw new UnavailableException("Can't populate DefinitionsFactoryConfig class from '"
                + config.getPrefix() + "/struts-config.xml':" + ex.getMessage());
    }

    return factoryConfig;
}

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From source file:org.apache.struts.validator.ValidatorPlugIn.java

/**
 * Initialize and load our resources.//  w w w.  j  a  v a 2 s .c o  m
 *
 * @param servlet The ActionServlet for our application
 * @param config  The ModuleConfig for our owning module
 * @throws ServletException if we cannot configure ourselves correctly
 */
public void init(ActionServlet servlet, ModuleConfig config) throws ServletException {
    // Remember our associated configuration and servlet
    this.config = config;
    this.servlet = servlet;

    // Load our database from persistent storage
    try {
        this.initResources();

        servlet.getServletContext().setAttribute(VALIDATOR_KEY + config.getPrefix(), resources);

        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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From source file:org.apache.webapp.admin.ApplicationServlet.java

/**
 * Validate the existence of the Registry that should have been
 * provided to us by an instance of/*www. j a v a  2 s  .  c o  m*/
 * <code>org.apache.catalina.mbean.ServerLifecycleListener</code>
 * enabled at startup time.
 *
 * @exception ServletException if we cannot find the Registry
 */
protected void initRegistry() throws ServletException {

    registry = Registry.getRegistry();
    //(Registry) getServletContext().getAttribute
    //    ("org.apache.catalina.Registry");
    if (registry == null)
        throw new UnavailableException("Registry is not available");

}

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From source file:org.apache.webapp.admin.ApplicationServlet.java

/**
 * Validate the existence of the MBeanServer that should have been
 * provided to us by an instance of// www. ja  v  a  2s  .  co m
 * <code>org.apache.catalina.mbean.ServerLifecycleListener</code>
 * enabled at startup time.
 *
 * @exception ServletException if we cannot find the MBeanServer
 */
protected void initServer() throws ServletException {

    server = Registry.getRegistry().getMBeanServer();
    //(MBeanServer) getServletContext().getAttribute
    //    ("org.apache.catalina.MBeanServer");
    if (server == null)
        throw new UnavailableException("MBeanServer is not available");

}

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From source file:org.gss_project.gss.server.rest.Webdav.java

@Override
public void init() throws ServletException {
    if (getServletConfig().getInitParameter("input") != null)
        input = Integer.parseInt(getServletConfig().getInitParameter("input"));

    if (getServletConfig().getInitParameter("output") != null)
        output = Integer.parseInt(getServletConfig().getInitParameter("output"));

    fileEncoding = getServletConfig().getInitParameter("fileEncoding");

    // Sanity check on the specified buffer sizes
    if (input < 256)
        input = 256;/*from w w  w  .j a  v a2 s  . c o  m*/
    if (output < 256)
        output = 256;
    if (logger.isDebugEnabled())
        logger.debug("Input buffer size=" + input + ", output buffer size=" + output);

    if (getServletConfig().getInitParameter("secret") != null)
        secret = getServletConfig().getInitParameter("secret");

    // 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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From source file:org.mobicents.servlet.sip.pbx.PbxServlet.java

@Override
public void init(ServletConfig config) throws ServletException {
    super.init(config);

    SipFactory sipFactory = (SipFactory) getServletContext().getAttribute(SIP_FACTORY);
    LocationService locationService = (LocationService) getServletContext()
            .getAttribute(Constants.LOCATION_SERVICE);

    if (locationService == null) {
        logger.error("No location service in context");
        throw new UnavailableException("no location service");
    }// w  w  w .j a va 2  s  . c o m

    registrar = new RegistrarService();
    registrar.setLocationService(locationService);
    registrar.setSipFactory(sipFactory);

    proxy = new ProxyService();
    proxy.setLocationService(locationService);
    proxy.setSipFactory(sipFactory);

    logger.info("PbxServlet initialized");
}

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