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RESTEasy is installed and configured in different ways depending on which environment you are running in. If you are running in JBoss AS 6-M4 (milestone 4) or higher, resteasy is already bundled and integrated completely so there is very little you have to do. If you are running in a different distribution, there is some manual installation and configuration you will have to do.
If you are using resteasy outside of JBoss AS 6, you will need to do a few manual steps to install and configure resteasy. RESTeasy is deployed as a WAR archive and thus depends on a Servlet container. We strongly suggest that you use Maven to build your WAR files as RESTEasy is split into a bunch of different modules. You can see an example Maven project in one of the examples in the examples/ directory
Also, when you download RESTeasy and unzip it you will see a lib/ directory that contains the libraries needed by resteasy. Copy these into your /WEB-INF/lib directory. Place your JAX-RS annotated class resources and providers within one or more jars within /WEB-INF/lib or your raw class files within /WEB-INF/classes.
RESTeasy is implemented as a Servlet and deployed within a WAR file. If you open up the WEB-INF/web.xml in one of the example projects of your RESTeasy download you will see this:
<web-app> <display-name>Archetype Created Web Application</display-name> <servlet> <servlet-name>Resteasy</servlet-name> <servlet-class> org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher </servlet-class> <init-param> <param-name>javax.ws.rs.Application</param-name> <param-value>com.restfully.shop.services.ShoppingApplication</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>Resteasy</servlet-name> <url-pattern>/*</url-pattern> </servlet-mapping> </web-app>
The Resteasy servlet is responsible for initializing some basic components of RESTeasy.
Resteasy receives configuration options from <context-param> elements.
Table 3.1.
Option Name | Default Value | Description |
---|---|---|
resteasy.servlet.mapping.prefix | no default | If the url-pattern for the Resteasy servlet-mapping is not /* |
resteasy.scan | false | Automatically scan WEB-INF/lib jars and WEB-INF/classes directory for both @Provider and JAX-RS resource classes (@Path, @GET, @POST etc..) and register them |
resteasy.scan.providers | false | Scan for @Provider classes and register them |
resteasy.scan.resources | false | Scan for JAX-RS resource classes |
resteasy.providers | no default | A comma delimited list of fully qualified @Provider class names you want to register |
resteasy.use.builtin.providers | true | Whether or not to register default, built-in @Provider classes. (Only available in 1.0-beta-5 and later) |
resteasy.resources | no default | A comma delimited list of fully qualified JAX-RS resource class names you want to register |
resteasy.jndi.resources | no default | A comma delimited list of JNDI names which reference objects you want to register as JAX-RS resources |
javax.ws.rs.Application | no default | Fully qualified name of Application class to bootstrap in a spec portable way |
resteasy.media.type.mappings | no default | Replaces the need for an Accept header by mapping file name extensions (like .xml or .txt) to a media type. Used when the client is unable to use a Accept header to choose a representation (i.e. a browser). See JAX-RS Content Negotiation chapter for more details. |
resteasy.language.mappings | no default | Replaces the need for an Accept-Language header by mapping file name extensions (like .en or .fr) to a language. Used when the client is unable to use a Accept-Language header to choose a language (i.e. a browser). See JAX-RS Content Negotiation chapter for more details |
The resteasy.servlet.mapping.prefix <context param> variable must be set if your servlet-mapping for the Resteasy servlet has a url-pattern other than /*. For example, if the url-pattern is
<servlet-mapping> <servlet-name>Resteasy</servlet-name> <url-pattern>/restful-services/*</url-pattern> </servlet-mapping>
Then the value of resteasy-servlet.mapping.prefix must be:
<context-param> <param-name>resteasy.servlet.mapping.prefix</param-name> <param-value>/restful-services</param-value> </context-param>
The javax.ws.rs.core.Application class is a standard JAX-RS class that you may implement to provide information on your deployment. It is simply a class the lists all JAX-RS root resources and providers.
/** * Defines the components of a JAX-RS application and supplies additional * metadata. A JAX-RS application or implementation supplies a concrete * subclass of this abstract class. */ public abstract class Application { private static final Set<Object> emptySet = Collections.emptySet(); /** * Get a set of root resource and provider classes. The default lifecycle * for resource class instances is per-request. The default lifecycle for * providers is singleton. * <p/> * <p>Implementations should warn about and ignore classes that do not * conform to the requirements of root resource or provider classes. * Implementations should warn about and ignore classes for which * {@link #getSingletons()} returns an instance. Implementations MUST * NOT modify the returned set.</p> * * @return a set of root resource and provider classes. Returning null * is equivalent to returning an empty set. */ public abstract Set<Class<?>> getClasses(); /** * Get a set of root resource and provider instances. Fields and properties * of returned instances are injected with their declared dependencies * (see {@link Context}) by the runtime prior to use. * <p/> * <p>Implementations should warn about and ignore classes that do not * conform to the requirements of root resource or provider classes. * Implementations should flag an error if the returned set includes * more than one instance of the same class. Implementations MUST * NOT modify the returned set.</p> * <p/> * <p>The default implementation returns an empty set.</p> * * @return a set of root resource and provider instances. Returning null * is equivalent to returning an empty set. */ public Set<Object> getSingletons() { return emptySet; } }
To use Application you must set a servlet init-param, javax.ws.rs.Application with a fully qualified class that implements Application. For example:
<servlet> <servlet-name>Resteasy</servlet-name> <servlet-class> org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher </servlet-class> <init-param> <param-name>javax.ws.rs.Application</param-name> <param-value>com.restfully.shop.services.ShoppingApplication</param-value> </init-param> </servlet>
If you have this set, you should probably turn off automatic scanning as this will probably result in duplicate classes being registered.
The initialization of RESTEasy can be performed within a ServletContextListener instead of within the Servlet. You may need this if you are writing custom Listeners that need to interact with RESTEasy at boot time. An example of this is the RESTEasy Spring integration that requires a Spring ServletContextListener. The org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap class is a ServletContextListener that configures an instance of an ResteasyProviderFactory and Registry. You can obtain instances of a ResteasyProviderFactory and Registry from the ServletContext attributes org.jboss.resteasy.spi.ResteasyProviderFactory and org.jboss.resteasy.spi.Registry. From these instances you can programmatically interact with RESTEasy registration interfaces.
<web-app> <listener> <listener-class> org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap </listener-class> </listener> <!-- ** INSERT YOUR LISTENERS HERE!!!! --> <servlet> <servlet-name>Resteasy</servlet-name> <servlet-class> org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher </servlet-class> </servlet> <servlet-mapping> <servlet-name>Resteasy</servlet-name> <url-pattern>/resteasy/*</url-pattern> </servlet-mapping> </web-app>
The downside of running Resteasy as a Servlet is that you cannot have static resources like .html and .jpeg files in the same path as your JAX-RS services. Resteasy allows you to run as a Filter instead. If a JAX-RS resource is not found under the URL requested, Resteasy will delegate back to the base servlet container to resolve URLs.
<web-app> <filter> <filter-name>Resteasy</filter-name> <filter-class> org.jboss.resteasy.plugins.server.servlet.FilterDispatcher </filter-class> <init-param> <param-name>javax.ws.rs.Application</param-name> <param-value>com.restfully.shop.services.ShoppingApplication</param-value> </init-param> </filter> <filter-mapping> <filter-name>Resteasy</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
RESTEasy is preconfigured and completely integrated with JBoss 6-M4 and higher. You can use it with EJB and CDI and you can rely completely on JBoss for scanning for your JAX-RS services and deploying them. All you have to provide is your JAX-RS service classes packaged within a WAR either as POJOs, CDI beans, or EJBs and provide an empty web.xml file as follows:
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> </web-app>
RESTEasy supports logging via java.util.logging, Log4j, or Slf4j. How it picks which framework to delegate to is expressed in the following algorithm:
If log4j is in the application's classpath, log4j will be used
If slf4j is in the application's classpath, slf4j will be used
java.util.logging is the default if neither log4j or slf4j is in the classpath
If the servlet context param resteasy.logger.type is set to JUL, LOG4J, or SLF4J will override this default behavior
The logging categories are still a work in progress, but the initial set should make it easier to trouleshoot issues. Currently, the framework has defined the following log categories:
Table 3.2.
Category | Function |
---|---|
org.jboss.resteasy.core | Logs all activity by the core RESTEasy implementation |
org.jboss.resteasy.plugins.providers | Logs all activity by RESTEasy entity providers |
org.jboss.resteasy.plugins.server | Logs all activity by the RESTEasy server implementation. |
org.jboss.resteasy.specimpl | Logs all activity by JAX-RS implementing classes |
org.jboss.resteasy.mock | Logs all activity by the RESTEasy mock framework |