1. Architecture: JBoss is a full-featured Java application server that offers a complete set of services and features. It follows a multi-tiered architecture with components like web containers, EJB containers, and messaging services. On the other hand, Jetty is a lightweight web server and servlet container that focuses solely on serving HTTP requests and handling servlets. It does not provide all the additional services and features like JBoss.

2. Scalability: JBoss is known for its scalability and high-performance capabilities. It can handle large workloads and distribute the workload across multiple servers using clustering techniques. Jetty, although capable of handling moderate workloads, may struggle with scaling to handle large traffic volumes and may require additional components or configurations for achieving scalability.

3. Configuration: JBoss uses a configuration-based approach, often requiring XML files to define the server and application configurations. It offers various tools and APIs to manage and configure the server. On the other hand, Jetty uses a code-based approach, where the configuration is programmatically defined using Java code or annotations. This can provide more flexibility and control over the server configuration.

4. Ease of Use: Jetty is often considered easier to use compared to JBoss. Its lightweight nature and simple setup make it suitable for development and testing environments. JBoss, being a full-featured application server, may have a steeper learning curve and require more in-depth knowledge of its various components and features.

5. Community Support: JBoss has a large and active community with comprehensive documentation, forums, and user groups. It is widely adopted and supported by Red Hat, which provides commercial support and services. Jetty also has a supportive community, but it may not be as extensive as the JBoss community. However, Jetty benefits from being part of the Eclipse Foundation, which ensures long-term support and development.

6. Industry Adoption: JBoss has been widely adopted in enterprise environments for running Java applications, particularly in large-scale deployments. It is well-suited for complex, mission-critical applications that require extensive features and robustness. On the other hand, Jetty is often chosen for lightweight web applications, embedded systems, and mobile applications where low resource usage and fast startup time are crucial.

In summary, JBoss is a comprehensive and scalable Java application server with extensive features and support, whereas Jetty is a lightweight web server and servlet container that offers simplicity and speed. The choice between the two depends on the specific requirements of the application and the scale at which it needs to operate.