How to Serve Static Content with Jersey\'s Universal URL Mapping While Avoiding 404 Errors?

Serving Static Content with Jersey's Universal URL Mapping

Jersey's widespread use of the /* URL pattern in its mapping can sometimes cause 404 errors when accessing static resources like HTML files. This issue stems from the fact that the mapping conflicts with the default handling of static content in the web container.

Resolving the Conflict in Jersey 1.x

To serve static content while utilizing the /* mapping in Jersey 1.x, it's recommended to switch from the Jersey servlet to a filter. This can be achieved by updating the web.xml configuration as follows:

<code class="xml"><filter>
  <filter-name>Jersey Filter</filter-name>
  <filter-class>com.sun.jersey.spi.container.servlet.ServletContainer</filter-class>
  <init-param>
    <param-name>javax.ws.rs.Application</param-name>
    <param-value>org.frog.jump.JerseyApp</param-value>
  </init-param>
  <init-param>
    <param-name>com.sun.jersey.config.property.WebPageContentRegex</param-name>
    <param-value>/.*html</param-value>
  </init-param>
</filter> 
<filter-mapping>
  <filter-name>Jersey Filter</filter-name>
  <url-pattern>/*</url-pattern> 
</filter-mapping></code>

This configuration will allow Jersey to filter requests based on the WebPageContentRegex pattern (/.*html in this case), enabling static resources to be served as intended.

Resolving the Conflict in Jersey 2.x

The solution for Jersey 2.x is similar to that of 1.x, with slight modifications due to changes in property names. The following web.xml configuration should resolve the issue:

<code class="xml"><filter>
  <filter-name>Jersey Filter</filter-name>
  <filter-class>org.glassfish.jersey.servlet.ServletContainer</filter-class>
  <init-param>
    <param-name>jersey.config.server.provider.packages</param-name>
    <param-value>org.example</param-value>
  </init-param>
  <init-param>
    <param-name>jersey.config.servlet.filter.staticContentRegex</param-name>
    <param-value>/.*html</param-value>
  </init-param>
</filter> 
<filter-mapping>
  <filter-name>Jersey Filter</filter-name>
  <url-pattern>/*</url-pattern> 
</filter-mapping></code>

Additionally, the POM file must include the following dependencies:

<code class="xml"><dependency>
  <groupId>org.glassfish.jersey.core</groupId>
  <artifactId>jersey-server</artifactId>
  <version>${jersey2.version}</version>
  <type>jar</type>
  <scope>compile</scope>
</dependency>

<dependency>
  <groupId>org.glassfish.jersey.containers</groupId>
  <artifactId>jersey-container-servlet-core</artifactId>
  <version>${jersey2.version}</version>
  <type>jar</type>
  <scope>compile</scope>
</dependency></code>

The staticContentRegex parameter can be customized to match different file extensions as needed.

As an alternative to using a filter, another approach is to define a versioned path for services, such as "/v1/*", allowing static content to be served without requiring a filter.

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