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.seasar.struts.hotdeploy.impl.ChainConfigLoaderImpl.java

protected List splitAndResolvePaths(String paths) throws ServletException {
    ClassLoader loader = Thread.currentThread().getContextClassLoader();

    if (loader == null) {
        loader = this.getClass().getClassLoader();
    }//from  w  ww. ja  v a 2 s .co m

    ArrayList resolvedUrls = new ArrayList();

    URL resource;
    String path = null;

    try {
        // Process each specified resource path
        while (paths.length() > 0) {
            resource = null;

            int comma = paths.indexOf(',');

            if (comma >= 0) {
                path = paths.substring(0, comma).trim();
                paths = paths.substring(comma + 1);
            } else {
                path = paths.trim();
                paths = "";
            }

            if (path.length() < 1) {
                break;
            }

            if (path.charAt(0) == '/') {
                resource = getServletContext().getResource(path);
            }

            if (resource == null) {
                if (log.isDebugEnabled()) {
                    log.debug("Unable to locate " + path + " in the servlet context, " + "trying classloader.");
                }

                Enumeration e = loader.getResources(path);

                if (!e.hasMoreElements()) {
                    String msg = getActionServlet().getInternal().getMessage("configMissing", path);

                    log.error(msg);
                    throw new UnavailableException(msg);
                } else {
                    while (e.hasMoreElements()) {
                        resolvedUrls.add(e.nextElement());
                    }
                }
            } else {
                resolvedUrls.add(resource);
            }
        }
    } catch (MalformedURLException e) {
        throw new ServletException(path, e);
    } catch (IOException e) {
        throw new ServletException(path, e);
    }

    return resolvedUrls;
}

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From source file:org.seasar.struts.hotdeploy.impl.ModuleConfigLoaderImpl.java

protected void parseModuleConfigFile(Digester digester, URL url) throws UnavailableException {
    InputStream input = null;/*  www.  j  a va 2 s .co m*/

    try {
        InputSource is = new InputSource(url.toExternalForm());
        URLConnection conn = url.openConnection();

        conn.setUseCaches(false);
        conn.connect();
        input = conn.getInputStream();
        is.setByteStream(input);
        digester.parse(is);
    } catch (IOException e) {
        handleConfigException(url.toString(), e);
    } catch (SAXException e) {
        handleConfigException(url.toString(), e);
    } finally {
        if (input != null) {
            try {
                input.close();
            } catch (IOException e) {
                throw new UnavailableException(e.getMessage());
            }
        }
    }
}

---

From source file:org.seasar.struts.hotdeploy.impl.ModuleConfigLoaderImpl.java

/**
 * <p>/*from  w w  w  .ja va2s . c  om*/
 * Simplifies exception handling in the parseModuleConfigFile method.
 * <p>
 * 
 * @param path
 *            The path to which the exception relates.
 * @param e
 *            The exception to be wrapped and thrown.
 * @throws UnavailableException
 *             as a wrapper around Exception
 */
private void handleConfigException(String path, Exception e) throws UnavailableException {
    String msg = getActionServlet().getInternal().getMessage("configParse", path);

    log.error(msg, e);
    throw new UnavailableException(msg);
}

---

From source file:org.seasar.struts.hotdeploy.impl.ModuleConfigLoaderImpl.java

/**
 * <p>/*  w w w  .j ava  2 s . c  om*/
 * Handle errors related to creating an instance of the specified class.
 * </p>
 * 
 * @param className
 *            The className that could not be instantiated.
 * @param e
 *            The exception that was caught.
 * @throws ServletException
 *             to communicate the error.
 */
private void handleCreationException(String className, Exception e) throws ServletException {
    String errorMessage = getActionServlet().getInternal().getMessage("configExtends.creation", className);

    log.error(errorMessage, e);
    throw new UnavailableException(errorMessage);
}

---

From source file:org.seasar.struts.hotdeploy.impl.ModuleConfigLoaderImpl.java

/**
 * <p>//w  w w  .j  a va2s .co  m
 * General handling for exceptions caught while inheriting config
 * information.
 * </p>
 * 
 * @param configType
 *            The type of configuration object of configName.
 * @param configName
 *            The name of the config that could not be extended.
 * @param e
 *            The exception that was caught.
 * @throws ServletException
 *             to communicate the error.
 */
private void handleGeneralExtensionException(String configType, String configName, Exception e)
        throws ServletException {
    String errorMessage = getActionServlet().getInternal().getMessage("configExtends", configType, configName);

    log.error(errorMessage, e);
    throw new UnavailableException(errorMessage);
}

---

From source file:org.seasar.struts.hotdeploy.impl.ModuleConfigLoaderImpl.java

/**
 * <p>/*from   www.j a  v  a2s  . com*/
 * Handle errors caused by required fields that were not specified.
 * </p>
 * 
 * @param field
 *            The name of the required field that was not found.
 * @param configType
 *            The type of configuration object of configName.
 * @param configName
 *            The name of the config that's missing the required value.
 * @throws ServletException
 *             to communicate the error.
 */
private void handleValueRequiredException(String field, String configType, String configName)
        throws ServletException {
    String errorMessage = getActionServlet().getInternal().getMessage("configFieldRequired", field, configType,
            configName);

    log.error(errorMessage);
    throw new UnavailableException(errorMessage);
}

---

From source file:org.seasar.struts.hotdeploy.impl.ModuleConfigLoaderImpl.java

protected List splitAndResolvePaths(String paths) throws ServletException {
    ClassLoader loader = Thread.currentThread().getContextClassLoader();

    if (loader == null) {
        loader = this.getClass().getClassLoader();
    }/*from  w  w  w .j  a  v  a  2 s.c o  m*/

    ArrayList resolvedUrls = new ArrayList();

    URL resource;
    String path = null;

    try {
        // Process each specified resource path
        while (paths.length() > 0) {
            resource = null;

            int comma = paths.indexOf(',');

            if (comma >= 0) {
                path = paths.substring(0, comma).trim();
                paths = paths.substring(comma + 1);
            } else {
                path = paths.trim();
                paths = "";
            }

            if (path.length() < 1) {
                break;
            }

            if (path.charAt(0) == '/') {
                resource = getServletContext().getResource(path);
            }

            if (resource == null) {
                if (log.isDebugEnabled()) {
                    log.debug("Unable to locate " + path + " in the servlet context, " + "trying classloader.");
                }

                Enumeration e = loader.getResources(path);

                if (!e.hasMoreElements()) {
                    String msg = getActionServlet().getInternal().getMessage("configMissing", path);

                    log.error(msg);
                    throw new UnavailableException(msg);
                } else {
                    while (e.hasMoreElements()) {
                        resolvedUrls.add(e.nextElement());
                    }
                }
            } else {
                resolvedUrls.add(resource);
            }
        }
    } catch (MalformedURLException e) {
        handleConfigException(path, e);
    } catch (IOException e) {
        handleConfigException(path, e);
    }

    return resolvedUrls;
}

---

From source file:org.seasar.struts.hotdeploy.impl.ModuleConfigLoaderImpl.java

/**
 * <p>/*from   w w  w  .  ja  v  a 2  s.  co m*/
 * Checks if the current forwardConfig is using the correct class based on
 * the class of its configuration ancestor.
 * </p>
 * 
 * @param forwardConfig
 *            The forward to check.
 * @param moduleConfig
 *            The config for the current module.
 * @return The forward config using the correct class as determined by the
 *         config's ancestor and its own overridden value.
 * @throws UnavailableException
 *             if an instance of the forward config class cannot be created.
 * @throws ServletException
 *             on class creation error
 */
protected ForwardConfig processForwardConfigClass(ForwardConfig forwardConfig, ModuleConfig moduleConfig)
        throws ServletException {
    String ancestor = forwardConfig.getExtends();

    if (ancestor == null) {
        // Nothing to do, then
        return forwardConfig;
    }

    // Make sure that this config is of the right class
    ForwardConfig baseConfig = moduleConfig.findForwardConfig(ancestor);

    if (baseConfig == null) {
        throw new UnavailableException("Unable to find " + "forward '" + ancestor + "' to extend.");
    }

    // Was our forwards's class overridden already?
    if (forwardConfig.getClass().equals(ActionForward.class)) {
        // Ensure that our forward is using the correct class
        if (!baseConfig.getClass().equals(forwardConfig.getClass())) {
            // Replace the config with an instance of the correct class
            ForwardConfig newForwardConfig = null;
            String baseConfigClassName = baseConfig.getClass().getName();

            try {
                newForwardConfig = (ForwardConfig) RequestUtils.applicationInstance(baseConfigClassName);

                // copy the values
                BeanUtils.copyProperties(newForwardConfig, forwardConfig);
            } catch (Exception e) {
                handleCreationException(baseConfigClassName, e);
            }

            // replace forwardConfig with newForwardConfig
            moduleConfig.removeForwardConfig(forwardConfig);
            moduleConfig.addForwardConfig(newForwardConfig);
            forwardConfig = newForwardConfig;
        }
    }

    return forwardConfig;
}

---

From source file:org.seasar.struts.hotdeploy.impl.ModuleConfigLoaderImpl.java

/**
 * <p>/*from   w w w. ja v a  2  s  .c  o m*/
 * Checks if the current exceptionConfig is using the correct class based on
 * the class of its configuration ancestor.
 * </p>
 * 
 * @param exceptionConfig
 *            The config to check.
 * @param moduleConfig
 *            The config for the current module.
 * @return The exception config using the correct class as determined by the
 *         config's ancestor and its own overridden value.
 * @throws ServletException
 *             if an instance of the exception config class cannot be
 *             created.
 */
protected ExceptionConfig processExceptionConfigClass(ExceptionConfig exceptionConfig,
        ModuleConfig moduleConfig) throws ServletException {
    String ancestor = exceptionConfig.getExtends();

    if (ancestor == null) {
        // Nothing to do, then
        return exceptionConfig;
    }

    // Make sure that this config is of the right class
    ExceptionConfig baseConfig = moduleConfig.findExceptionConfig(ancestor);

    if (baseConfig == null) {
        throw new UnavailableException("Unable to find " + "exception config '" + ancestor + "' to extend.");
    }

    // Was our config's class overridden already?
    if (exceptionConfig.getClass().equals(ExceptionConfig.class)) {
        // Ensure that our config is using the correct class
        if (!baseConfig.getClass().equals(exceptionConfig.getClass())) {
            // Replace the config with an instance of the correct class
            ExceptionConfig newExceptionConfig = null;
            String baseConfigClassName = baseConfig.getClass().getName();

            try {
                newExceptionConfig = (ExceptionConfig) RequestUtils.applicationInstance(baseConfigClassName);

                // copy the values
                BeanUtils.copyProperties(newExceptionConfig, exceptionConfig);
            } catch (Exception e) {
                handleCreationException(baseConfigClassName, e);
            }

            // replace exceptionConfig with newExceptionConfig
            moduleConfig.removeExceptionConfig(exceptionConfig);
            moduleConfig.addExceptionConfig(newExceptionConfig);
            exceptionConfig = newExceptionConfig;
        }
    }

    return exceptionConfig;
}

---

From source file:org.vfny.geoserver.config.MultipleActionServlet.java

/**
 * <p>Initialize this servlet.  Most of the processing has been factored into
 * support methods so that you can override particular functionality at a
 * fairly granular level.</p>//from w ww .j a v a 2s  .  c om
 *
 * @exception ServletException if we cannot configure ourselves correctly
 */
public void init() throws ServletException {
    // Wraps the entire initialization in a try/catch to better handle
    // unexpected exceptions and errors to provide better feedback
    // to the developer
    try {
        initInternal();
        initOther();
        initServlet();

        getServletContext().setAttribute(Globals.ACTION_SERVLET_KEY, this);
        initModuleConfigFactory();

        // Initialize modules as needed
        ModuleConfig moduleConfig = initModuleConfig("", config);
        initModuleMessageResources(moduleConfig);
        initModuleDataSources(moduleConfig);
        initModulePlugIns(moduleConfig);
        moduleConfig.freeze();

        Enumeration names = getServletConfig().getInitParameterNames();

        while (names.hasMoreElements()) {
            String name = (String) names.nextElement();

            if (!name.startsWith("config/")) {
                continue;
            }

            String prefix = name.substring(6);
            moduleConfig = initModuleConfig(prefix, getServletConfig().getInitParameter(name));
            initModuleMessageResources(moduleConfig);
            initModuleDataSources(moduleConfig);
            initModulePlugIns(moduleConfig);
            moduleConfig.freeze();
        }

        this.initModulePrefixes(this.getServletContext());

        this.destroyConfigDigester();
    } catch (UnavailableException ex) {
        throw ex;
    } catch (Throwable t) {
        // The follow error message is not retrieved from internal message
        // resources as they may not have been able to have been 
        // initialized
        log.error("Unable to initialize Struts ActionServlet due to an "
                + "unexpected exception or error thrown, so marking the "
                + "servlet as unavailable.  Most likely, this is due to an "
                + "incorrect or missing library dependency.", t);
        throw new UnavailableException(t.getMessage());
    }
}

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