Why does mapping Jersey\'s URL pattern to /* cause 404 errors for static resources in Jersey 2.0?

Jersey /* Servlet Mapping Triggering 404 Errors for Static Resources

If Jersey's URL pattern is mapped to /* in Jersey version 2.0, it can lead to 404 errors for all static resources like index.html. Here's the web.xml configuration causing this issue:

<code class="xml"><servlet>
  <servlet-name>JerseyApp</servlet-name>
  <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
  <init-param>
    <param-name>javax.ws.rs.Application</param-name>
    <param-value>org.frog.jump.JerseyApp</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
  <servlet-name>JerseyApp</servlet-name>
  <url-pattern>/*</url-pattern>
</servlet-mapping></code>

Solution for Jersey 1.x

In Jersey 1.x, you can switch from the Jersey servlet to the filter to enable serving static content:

<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>

Solution for Jersey 2.x

In Jersey 2.x, use the following filter configuration:

<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>

Ensure your POM includes:

<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>

Customize the regular expression in the init-param if serving different static file types (e.g., CSS, JSP).

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