/
Installation_Configuration.xml
1429 lines (1322 loc) · 62.8 KB
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Installation_Configuration.xml
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<chapter id="Installation_Configuration">
<title>Installation/Configuration</title>
<para>
RESTEasy is installed and configured in different ways depending on which environment you are running in.
If you are running in WildFly, RESTEasy is already bundled and integrated completely
so there is very little you have to do. If you are running in a different environment, there is some manual
installation and configuration you will have to do.
</para>
<section id="resteasy_modules_in_wildfly">
<title>RESTEasy modules in WildFly</title>
<para>
In WildFly, RESTEasy and the &REST-API; API are automatically loaded into your deployment's classpath
if and only if you are deploying a &REST-API; application (as determined by the presence
of &REST-API; annotations). However, only some RESTEasy features are automatically loaded. See Table 3.1.
If you need any of those libraries which are not loaded automatically, you'll have to bring them in
with a jboss-deployment-structure.xml file in the WEB-INF directory of your WAR file. Here's an example:
</para>
<programlisting><![CDATA[
<jboss-deployment-structure>
<deployment>
<dependencies>
<module name="org.jboss.resteasy.resteasy-jackson-provider" services="import"/>
</dependencies>
</deployment>
</jboss-deployment-structure>]]></programlisting>
<para>The <literal>services</literal> attribute must be set to "import" for modules that have default providers
in a META-INF/services/javax.ws.rs.ext.Providers file.
</para>
<para>
To get an idea of which RESTEasy modules are loaded by default when &REST-API; services are deployed, please
see the table below, which refers to a recent WildFly ditribution patched with the current RESTEasy
distribution. Clearly, future and unpatched WildFly distributions might differ a bit in terms of modules
enabled by default, as the container actually controls this too.
</para>
<para>
<table>
<tgroup cols="3" rowsep="1" colsep="1">
<thead>
<row>
<entry>
Module Name
</entry>
<entry>
Loaded by Default
</entry>
<entry>
Description
</entry>
</row>
</thead>
<tbody>
<row>
<entry>
org.jboss.resteasy.resteasy-atom-provider
</entry>
<entry>
yes
</entry>
<entry>
RESTEasy's atom library
</entry>
</row>
<row>
<entry>
org.jboss.resteasy.resteasy-cdi
</entry>
<entry>
yes
</entry>
<entry>
RESTEasy CDI integration
</entry>
</row>
<row>
<entry>
org.jboss.resteasy.resteasy-crypto
</entry>
<entry>
yes
</entry>
<entry>
S/MIME, DKIM, and support for other security formats.
</entry>
</row>
<row>
<entry>
org.jboss.resteasy.resteasy-jackson-provider
</entry>
<entry>
no
</entry>
<entry>
Integration with the JSON parser and object mapper Jackson (deprecated)
</entry>
</row>
<row>
<entry>
org.jboss.resteasy.resteasy-jackson2-provider
</entry>
<entry>
yes
</entry>
<entry>
Integration with the JSON parser and object mapper Jackson 2
</entry>
</row>
<row>
<entry>
org.jboss.resteasy.resteasy-jaxb-provider
</entry>
<entry>
yes
</entry>
<entry>
&XML-BIND-API; integration.
</entry>
</row>
<row>
<entry>
org.jboss.resteasy.resteasy-core
</entry>
<entry>
yes
</entry>
<entry>
Core RESTEasy libraries for server.
</entry>
</row>
<row>
<entry>
org.jboss.resteasy.resteasy-client
</entry>
<entry>
yes
</entry>
<entry>
Core RESTEasy libraries for client.
</entry>
</row>
<row>
<entry>
org.jboss.resteasy.jose-jwt
</entry>
<entry>
no
</entry>
<entry>
JSON Web Token support.
</entry>
</row>
<row>
<entry>
org.jboss.resteasy.resteasy-jsapi
</entry>
<entry>
yes
</entry>
<entry>
RESTEasy's Javascript API
</entry>
</row>
<row>
<entry>
org.jboss.resteasy.resteasy-json-p-provider
</entry>
<entry>
yes
</entry>
<entry>
JSON parsing API
</entry>
</row>
<row>
<entry>
org.jboss.resteasy.resteasy-json-binding-provider
</entry>
<entry>
yes
</entry>
<entry>
JSON binding API
</entry>
</row>
<row>
<entry>
javax.json.bind-api
</entry>
<entry>
yes
</entry>
<entry>
JSON binding API
</entry>
</row>
<row>
<entry>
org.eclipse.yasson
</entry>
<entry>
yes
</entry>
<entry>
RI implementation of JSON binding API
</entry>
</row>
<row>
<entry>
org.jboss.resteasy.resteasy-multipart-provider
</entry>
<entry>
yes
</entry>
<entry>
Support for multipart formats
</entry>
</row>
<row>
<entry>
org.jboss.resteasy.resteasy-spring
</entry>
<entry>
no
</entry>
<entry>
Spring provider
</entry>
</row>
<row>
<entry>
org.jboss.resteasy.resteasy-validator-provider
</entry>
<entry>
yes
</entry>
<entry>
RESTEasy's interface to Hibernate Bean Validation
</entry>
</row>
</tbody>
</tgroup>
</table>
</para>
<section id="other_resteasy_modules">
<title>Other RESTEasy modules</title>
<para>
Not all RESTEasy modules are bundled with WildFly. For example,
<code>resteasy-fastinfoset-provider</code> and <code>resteasy-wadl</code> are not included among the
modules listed in <xref linkend="resteasy_modules_in_wildfly"/>. If you want
to use them in your application, you can include them in your WAR as you would if you were
deploying outside of WildFly. See <xref linkend="standalone_resteasy"/> for more information.
</para>
</section>
<section id="upgrading-wildfly">
<title>Upgrading RESTEasy within WildFly</title>
<para>
RESTEasy is bundled with WildFly. However you may wish to upgrade to the latest version. With
<ulink url="https://docs.wildfly.org/24/Galleon_Guide.html">Galleon</ulink> this makes upgrading RESTEasy
in WildFly quite easy.
</para>
<para>
The first requirement is the WildFly installation is provisioned with Galleon. The simplest way to do
this for a local installation is with <ulink url="https://docs.wildfly.org/galleon/#_galleon_cli_tool">Galleon CLI</ulink>.
<programlisting><![CDATA[$ galleon.sh install wildfly:current]]></programlisting>
To install the RESTEasy upgrade on top of that you simply need to use the tool again with the Maven GAV:
<programlisting><![CDATA[$ galleon.sh install org.jboss.resteasy:galleon-feature-pack:5.0.0.Final]]></programlisting>
</para>
<para>
If you are using Maven to provision WildFly you can simply add the feature pack to your plugin configuration.
<programlisting><![CDATA[
<plugin>
<groupId>org.jboss.galleon</groupId>
<artifactId>galleon-maven-plugin</artifactId>
<configuration>
<install-dir>${jboss.home}</install-dir>
<record-state>true</record-state>
<log-time>true</log-time>
<offline>false</offline>
<feature-packs>
<feature-pack>
<groupId>org.jboss.resteasy</groupId>
<artifactId>galleon-feature-pack</artifactId>
<version>5.0.0.Final</version>
</feature-pack>
</feature-packs>
</configuration>
<executions>
<execution>
<id>server-provisioning</id>
<phase>generate-test-resources</phase>
<goals>
<goal>provision</goal>
</goals>
</execution>
</executions>
</plugin>]]>
</programlisting>
</para>
</section>
</section>
<section>
<title>Deploying a RESTEasy application to WildFly</title>
<para>
RESTEasy is bundled with WildFly and completely integrated as per the requirements of Jakarta EE.
You can use it with &ENTERPRISE-BEANS; and CDI and you can rely completely on WildFly to scan for and deploy your &REST-API; services and providers.
All you have to provide is your &REST-API; service and provider classes packaged
within a WAR either as POJOs, CDI beans, or &ENTERPRISE-BEANS;.
A simple way to configure an application is by simply providing an empty web.xml file.
You can of course deploy any custom servlet, filter
or security constraint you want to within your web.xml, but none of them are required:
</para>
<para>
<programlisting><![CDATA[
<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>]]></programlisting>
</para>
<para>
Also, web.xml can supply to RESTEasy init-params and context-params (see <xref linkend="configuration_switches"/>)
if you want to tweak or turn on/off any specific RESTEasy feature.
</para>
<para>
Since we're not using a <servlet-mapping> element, we must define a
<classname>javax.ws.rs.core.Application</classname> class (see <xref linkend="javax.ws.rs.core.Application"/>) that is annotated with
the <classname>javax.ws.rs.ApplicationPath</classname> annotation. If you return any empty set for classes and singletons,
which is the behavior inherited from <classname>Application</classname>, your WAR will
be scanned for resource and provider classes as indicated by the presence of &REST-API; annotations.
</para>
<programlisting>
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.core.Application;
@ApplicationPath("/root-path")
public class MyApplication extends Application
{
} </programlisting>
<para>
<emphasis role="bold">Note.</emphasis> Actually, if the application jar contains an
<classname>Application</classname> class (or a subclass thereof)
which is annotated with an <classname>ApplicationPath</classname> annotation, a web.xml file isn't even needed.
Of course, even in this case it can be used to specify additional information such as context parameters.
If there is an <classname>Application</classname> class but it doesn't have an
<classname>@ApplicationPath</classname> annotation, then a web.xml file with at least a
<servlet-mapping> element is required.
</para>
<para>
<emphasis role="bold">Note.</emphasis> As mentioned in <xref linkend="other_resteasy_modules"/>,
not all RESTEasy modules are bundled with WildFly. For example,
resteasy-fastinfoset-provider and resteasy-wadl are not included among the
modules listed in <xref linkend="resteasy_modules_in_wildfly"/>. If you want
to use them in your application, you can include them in your WAR as you would if you were
deploying outside of WildFly. See <xref linkend="standalone_resteasy"/> for more information.
</para>
</section>
<section id="standalone_resteasy">
<title>Deploying to other servlet containers</title>
<para>
If you are using RESTEasy outside of WildFly, in a standalone servlet container like Tomcat or Jetty, for example,
you will need to include the appropriate RESTEasy jars in your WAR file. You will need the core classes
in the resteasy-core and resteasy-client modules, and you may need additional facilities like the resteasy-jaxb-provider module.
We strongly suggest that you use Maven to build your WAR files as RESTEasy is split into
a bunch of different modules:
</para>
<programlisting><![CDATA[
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-core</artifactId>
<version>5.0.0.Final</version>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-client</artifactId>
<version>5.0.0.Final</version>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxb-provider</artifactId>
<version>5.0.0.Final</version>
</dependency>
]]></programlisting>
<para>
You can see sample Maven projects in
<ulink url="https://github.com/resteasy/resteasy-examples">https://github.com/resteasy/resteasy-examples</ulink>.
</para>
<para>
If you are not using Maven, you can include the necessary jars by hand. If you download
RESTEasy (from <ulink url="http://resteasy.jboss.org/downloads.html">http://resteasy.jboss.org/downloads.html</ulink>,
for example) you will get a file like resteasy-jaxrs-<version>-all.zip.
If you unzip it you will see a lib/ directory that contains the libraries needed by RESTEasy.
Copy these, as needed, into your /WEB-INF/lib directory. Place your &REST-API; annotated class resources and providers
within one or more jars within /WEB-INF/lib or your raw class files within /WEB-INF/classes.
</para>
<section>
<title>Servlet 3.0 containers</title>
<para>
RESTEasy provides an implementation of the Servlet 3.0 <literal>ServletContainerInitializer</literal>
integration interface for containers to use in initializing an application.
The container calls this interface during the application's startup phase.
The RESTEasy implementation performs automatic scanning for resources and providers,
and programmatic registration of a servlet.
RESTEasy's implementation is provided in maven artifact, <literal>resteasy-servlet-initializer</literal>.
Add this artifact dependency to your project's pom.xml file so the JAR file will be included
in your WAR file.
</para>
<programlisting><![CDATA[
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-servlet-initializer</artifactId>
<version>5.0.0.Final</version>
</dependency>
]]></programlisting>
</section>
<section>
<title>Older servlet containers</title>
<para>
The <literal>resteasy-servlet-initializer</literal> artifact will not work in Servlet versions older than
3.0. You'll then have to manually declare the RESTEasy servlet in your WEB-INF/web.xml file of your WAR project,
and you'll have to use an <classname>Application</classname> class (see <xref linkend="javax.ws.rs.core.Application"/>)
which explicitly lists resources and providers. For example:
</para>
<para>
<programlisting><![CDATA[
<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>]]></programlisting>
</para>
<para>
The RESTEasy servlet is responsible for initializing some basic components of RESTEasy.
</para>
<para>
<emphasis role="bold">Note.</emphasis> It is likely that support for pre-3.0 Servlet specifications
will be deprecated and eliminated eventually.
</para>
</section>
</section>
<section id="microprofile_config">
<title>Configuration</title>
<para>
RESTEasy has two mutually exclusive mechanisms for retrieving configuration parameters
(see <xref linkend="configuration_switches"/>).
The classic mechanism depends on context-params and init-params in a web.xml file.
Alternatively, the Eclipse MicroProfile Config project
(<ulink url="https://github.com/eclipse/microprofile-config">https://github.com/eclipse/microprofile-config</ulink>)
provides a flexible parameter retrieval mechanism that RESTEasy will use if the necessary
dependencies are available. See <xref linkend="configuring_mp_config"/> for more about that. If
they are not available, it will fall back to an extended form of the classic mechanism.
</para>
<section id="resteasy_microprofile_config">
<title>RESTEasy with MicroProfile Config</title>
<para>
In the presence of the Eclipse MicroProfile Config API jar and an implementation
of the API (see <xref linkend="configuring_mp_config"/>), RESTEasy will use the facilities
of MicroProfile Config for accessing configuration properties (see <xref linkend="configuration_switches"/>).
MicroProfile Config offers to both RESTEasy users and RESTEasy developers a great deal of
flexibility in controlling runtime configuration.
</para>
<para>
In MicroProfile Config, a <classname>ConfigSource</classname> represents a <classname>Map<String, String></classname>
of property names to values, and a <classname>Config</classname> represents a sequence of <classname>ConfigSource</classname>s,
ordered by priority. The priority of a <classname>ConfigSource</classname> is given by an ordinal (represented by an
<classname>int</classname>), with a higher value indicating a higher priority. For a given property name, the
<classname>ConfigSource</classname>s are searched in order until a value is found.
</para>
<para>
MicroProfile Config mandates the presence of the following <classname>ConfigSource</classname>s:
</para>
<orderedlist>
<listitem>a <classname>ConfigSource</classname> based on System.getProperties() (ordinal = 400)</listitem>
<listitem>a <classname>ConfigSource</classname> based on System.getenv() (ordinal = 300)</listitem>
<listitem>a <classname>ConfigSource</classname> for each META-INF/microprofile-config.properties file on the ClassPath,
separately configurable via a config_ordinal property inside each file (default ordinal = 100)</listitem>
</orderedlist>
<para>
Note that a property which is found among the System properties and which is also in the System environment will be assigned
the System property value because of the relative priorities of the <classname>ConfigSource</classname>s.
</para>
<para>
The set of <classname>ConfigSources</classname> is extensible. For example, smallrye-config
(<ulink url="https://github.com/smallrye/smallrye-config">https://github.com/smallrye/smallrye-config</ulink>),
the implementation of the MicroProfile Config specification currently used by RESTEasy, adds the following
kinds of <classname>ConfigSource</classname>s:
</para>
<orderedlist>
<listitem><classname>PropertiesConfigSource</classname> creates a <classname>ConfigSource</classname> from a
Java <classname>Properties</classname> object or a Map<String, String> object or a properties file
(referenced by its URL) (default ordinal = 100).</listitem>
<listitem><classname>DirConfigSource</classname> creates a <classname>ConfigSource</classname> that will look into a directory
where each file corresponds to a property (the file name is the property key and its textual content is the property value).
This <classname>ConfigSource</classname> can be used to read configuration from Kubernetes ConfigMap (default ordinal = 100).</listitem>
<listitem><classname>ZkMicroProfileConfig</classname> creates a <classname>ConfigSource</classname>ConfigSource that is backed by Apache Zookeeper
(ordinal = 150).</listitem>
</orderedlist>
<para>
These can be registered programmatically by using an instance of <classname>ConfigProviderResolver</classname>:
</para>
<programlisting>
Config config = new PropertiesConfigSource("file:/// ...");
ConfigProviderResolver.instance().registerConfig(config, getClass().getClassLoader());
</programlisting>
<para>where <classname>ConfigProviderResolver</classname> is part of the Eclipse API.</para>
<para>
If the application is running in Wildfly, then Wildfly provides another set of <classname>ConfigSource</classname>s,
as described in the "MicroProfile Config Subsystem Configuration" section of the WildFly Admin guide
(<ulink url="https://docs.wildfly.org/21/Admin_Guide.html#MicroProfile_Config_SmallRye">https://docs.wildfly.org/21/Admin_Guide.html#MicroProfile_Config_SmallRye</ulink>).
</para>
<para>
Finally, RESTEasy automatically provides three more <classname>ConfigSource</classname>s:
</para>
<itemizedlist>
<listitem><classname>org.jboss.resteasy.microprofile.config.ServletConfigSource</classname> represents
a servlet's <init-param>s from web.xml (ordinal = 60).</listitem>
<listitem><classname>org.jboss.resteasy.microprofile.config.FilterConfigSource</classname> represents
a filter's <init-param>s from web.xml (ordinal = 50). (See <xref linkend="filter"/> for more information.)
</listitem>
<listitem><classname>org.jboss.resteasy.microprofile.config.ServletContextConfigSource</classname> represents
<context-param>s from web.xml (ordinal = 40).</listitem>
</itemizedlist>
<para>
<emphasis role="bold">Note. </emphasis>As stated by the MicroProfile Config specification, a special property
<classname>config_ordinal</classname> can be set within any RESTEasy built-in <classname>ConfigSource</classname>s.
The default implementation of getOrdinal() will attempt to read this value. If found and a valid integer, the value
will be used. Otherwise the respective default value will be used.
</para>
</section>
<section>
<title>Using pure MicroProfile Config</title>
<para>
The MicroProfile Config API is very simple. A <classname>Config</classname> may be obtained either
programatically:
</para>
<programlisting>
Config config = ConfigProvider.getConfig();
</programlisting>
<para>
or, in the presence of CDI, by way of injection:
</para>
<programlisting>
@Inject Config config;
</programlisting>
<para>
Once a <classname>Config</classname> has been obtained, a property can be queried. For example,
</para>
<programlisting>
String s = config.getValue("prop_name", String.class);
</programlisting>
<para>
or
</para>
<programlisting>
String s = config.getOptionalValue("prop_name", String.class).orElse("d'oh");
</programlisting>
<para>
Now, consider a situation in which "prop_name" has been set by <code>System.setProperty("prop_name", "system")</code>
and also by
</para>
<programlisting>
<context-param>
<param-name>prop_name</param-name>
<param-value>context</param-value>
</context-param>
</programlisting>
<para>
Then, since the system parameter <classname>ConfigSource</classname> has precedence over (has a higher ordinal than)
<classname>ServletContextConfigSource</classname>, <code>config.getValue("prop_name", String.class)</code> will
return "system" rather than "context".
</para>
</section>
<section>
<title>Using RESTEasy's extension of MicroProfile Config</title>
<para>
RESTEasy offers a general purpose parameter retrieval mechanism which incorporates MicroProfile Config if the necessary
dependencies are available, and which falls back to an extended version of the classic RESTEasy mechanism
(see <xref linkend="classic_config"/>) otherwise.
</para>
<para>Calling</para>
<programlisting>
ConfigurationFactory.getInstance().getConfiguration()
</programlisting>
<para>
will return an instance of org.jboss.resteasy.spi.config.Configuration:
</para>
<programlisting>
public interface Configuration {
/**
* Returns the resolved value for the specified type of the named property.
*
* @param name the name of the parameter
* @param type the type to convert the value to
* @param <T> the property type
*
* @return the resolved optional value
*
* @throws IllegalArgumentException if the type is not supported
*/
<T> Optional<T> getOptionalValue(String name, Class<T> type);
/**
* Returns the resolved value for the specified type of the named property.
*
* @param name the name of the parameter
* @param type the type to convert the value to
* @param <T> the property type
*
* @return the resolved value
*
* @throws IllegalArgumentException if the type is not supported
* @throws java.util.NoSuchElementException if there is no property associated with the name
*/
<T> T getValue(String name, Class<T> type);
}
</programlisting>
<para>
For example,
</para>
<programlisting>
String value = ConfigurationFactory.getInstance().getConfiguration().getOptionalValue("prop_name", String.class).orElse("d'oh");
</programlisting>
<para>
If MicroProfile Config is available, that would be equivalent to
</para>
<programlisting>
String value = ConfigProvider.getConfig().getOptionalValue("prop_name", String.class).orElse("d'oh");
</programlisting>
<para>
If MicroProfile Config is not available, then an attempt is made to retrieve the parameter from
the following sources:
</para>
<orderedlist>
<listitem>system variables, followed by</listitem>
<listitem>environment variables, followed by</listitem>
<listitem>web.xml parameters, as described in <xref linkend="classic_config"/> </listitem>
</orderedlist>
</section>
<section id="configuring_mp_config">
<title>Configuring MicroProfile Config</title>
<para>
If an application is running inside Wildfly, then all of the dependencies are automatically available. Outside of
Wildfly, an application will need the Eclipse MicroProfile API at compile time. In maven, for example, use
</para>
<para>
As of RESTEasy 5.0 you will first need to add the RESTEasy MicroProfile Config dependency.
</para>
<programlisting>
<dependency>
<groupId>org.jboss.resteasy.microprofile</groupId>
<artifactId>microprofile-config</artifactId>
<scope>compile</scope>
</dependency>
</programlisting>
<para>
You will also need the MicroProfile Config API and an Implementation, in our case SmallRye.
</para>
<programlisting>
<dependency>
<groupId>org.eclipse.microprofile.config</groupId>
<artifactId>microprofile-config-api</artifactId>
<scope>compile</scope>
</dependency>
</programlisting>
<programlisting>
<dependency>
<groupId>io.smallrye</groupId>
<artifactId>smallrye-config</artifactId>
<scope>runtime</scope>
</dependency>
</programlisting>
</section>
<section id="classic_config">
<title>RESTEasy's classic configuration mechanism</title>
<para>
Prior to the incorporation of MicroProfile Config, nearly all of RESTEasy's parameters were retrieved from
servlet init-params and context-params. Which ones are available depends on how a web application invokes RESTEasy.
</para>
<para>
If RESTEasy is invoked as a servlet, as in
</para>
<programlisting>
<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">
<context-param>
<param-name>system</param-name>
<param-value>system-context</param-value>
</context-param>
<servlet>
<servlet-name>Resteasy</servlet-name>
<servlet-class>org.jboss.resteasy.plugins.server.servlet.HttpServlet30Dispatcher</servlet-class>
<init-param>
<param-name>system</param-name>
<param-value>system-init</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>Resteasy</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>
</programlisting>
<para>
then the servlet specific init-params and the general context-params are available,
with the former taking precedence over the latter. For example, the property "system" would
have the value "system-init".
</para>
<para>
If RESTEasy is invoked by way of a filter (see <xref linkend="filter"/>), as in
</para>
<programlisting>
<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">
<context-param>
<param-name>system</param-name>
<param-value>system-context</param-value>
</context-param>
<filter>
<filter-name>Resteasy</filter-name>
<filter-class>org.jboss.resteasy.plugins.server.servlet.FilterDispatcher</filter-class>
<init-param>
<param-name>system</param-name>
<param-value>system-filter</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>Resteasy</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
</programlisting>
<para>
then the filter specific init-params and the general context-params are available,
with the former taking precedence over the latter. For example, the property "system" would
have the value "system-filter".
</para>
<para>
Finally, if RESTEasy is invoked by way of a ServletContextListener (see <xref linkend="listener"/>), as in
</para>
<programlisting>
<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">
<listener>
<listener-class>
org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
</listener-class>
</listener>
<context-param>
<param-name>system</param-name>
<param-value>system-context</param-value>
</context-param>
</web-app>
</programlisting>
<para>
where <classname>ResteasyBootstrap</classname> is a <classname>ServletContextListener</classname>,
then the context-params are available.
</para>
</section>
<section id="overriding_config">
<title>Overriding RESTEasy's configuration mechanism</title>
<para>
Before adopting the default behavior, with or without MicroProfile Config, as described in
previous sections, RESTEasy will use service loading to look for one or more implementations of
the interface <classname>org.jboss.resteasy.spi.config.ConfigurationFactory</classname>, selecting one
with the highest priority as determined by the value returned by
<methodname>ConfigurationFactory.priority()</methodname>. Smaller numbers indicate higher priority.
The default <classname>ConfigurationFactory</classname> is
<classname>org.jboss.resteasy.core.config.DefaultConfigurationFactory</classname> with a priority of 500.
</para>
</section>
</section>
<section id="configuration_switches">
<title>Configuration switches</title>
<para>RESTEasy can receive the following configuration options from any <classname>ConfigSource</classname>s
that are available at runtime:
</para>
<para>
<table frame="topbot">
<tgroup cols="3" rowsep="1" colsep="1">
<thead>
<row>
<entry>
Option Name
</entry>
<entry>
Default Value
</entry>
<entry>
Description
</entry>
</row>
</thead>
<tbody>
<row>
<entry>
resteasy.servlet.mapping.prefix
</entry>
<entry>
no default
</entry>
<entry>
If the url-pattern for the RESTEasy servlet-mapping is not /*
</entry>
</row>
<row>
<entry>
resteasy.providers
</entry>
<entry>
no default
</entry>
<entry>
A comma delimited list of fully qualified @Provider class names you want to register
</entry>
</row>
<row>
<entry>
resteasy.use.builtin.providers
</entry>
<entry>
true
</entry>
<entry>
Whether or not to register default, built-in @Provider classes
</entry>
</row>
<row>
<entry>
resteasy.resources
</entry>
<entry>
no default
</entry>
<entry>
A comma delimited list of fully qualified &REST-API; resource class names you want to
register
</entry>
</row>
<row>
<entry>
resteasy.jndi.resources
</entry>
<entry>
no default
</entry>
<entry>
A comma delimited list of JNDI names which reference objects you want to register as
&REST-API; resources
</entry>
</row>
<row>
<entry>
javax.ws.rs.Application
</entry>
<entry>
no default
</entry>
<entry>
Fully qualified name of Application class to bootstrap in a spec portable way
</entry>
</row>
<row>
<entry>
resteasy.media.type.mappings
</entry>
<entry>
no default
</entry>
<entry>
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 an Accept header to choose a representation (i.e. a browser). See
<xref linkend="Jakarta_REST_Content_Negotiation"/> for more details.
</entry>
</row>
<row>
<entry>
resteasy.language.mappings
</entry>
<entry>
no default
</entry>
<entry>
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 an Accept-Language header to choose a language (i.e. a browser). See
<xref linkend="Jakarta_REST_Content_Negotiation"/> for more details.
</entry>
</row>
<row>
<entry>
resteasy.media.type.param.mapping
</entry>
<entry>
no default
</entry>
<entry>
Names a query parameter that can be set to an acceptable media type,
enabling content negotiation without an Accept header. See
<xref linkend="Jakarta_REST_Content_Negotiation"/> for more details.
</entry>
</row>
<row>
<entry>
resteasy.role.based.security
</entry>
<entry>
false
</entry>
<entry>
Enables role based security. See <xref linkend="Securing_Jakarta_REST_and_RESTeasy"/>
for more details.