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Presentation — 60 minutes Description
Apache Tomcat 7.0 is a Servlet container for the Servlet 3.0 specification. One of the more exiciting features in this new specification is the standard support for asynchronous servlet processing. In this session we will take a look at the asynchronous servlet API, the reasoning behind, its benefits and short falls. We will also take a look at the extensions and different methods Apache Tomcat 7 provides to meet some of these short falls.

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Here are the not-selected (by the planners) sessions that could go in the tomcat track:
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 mod_proxy versus mod_jk. Clustering with HTTP Server as front-end.   \[acus2009 440\] by Jean-Frederic Clere

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Presentation — 60 minutes Description
Browsers and web servers are standards and the need for instantaneous data exchange has grown. AJAX for example allows web clients to communicate "asynchronously" withremote web servers. Comet is a Tomcat 6 feature that goes beyond AJAX and allow real asynchronous unidirectional and bi-directional connections between client and server using the HTTPprotocol and Servlets. Servlet 3.0 SPEC's are also providing asynchronous calls see what is possible do with them. Tomcat-Native is a Tomcat sub-project that provides a non-blocking and very efficient SSL connections. Tomcat-Native relies on the APR (Apache Portable Runtime) for Socket input/output and use OpenSSL to make the cryptographic layers. Comparison of the performance of Tomcat, Tomcat + APR and httpd.

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 Solutions & Troubleshooting methodologies - For most commonly occurring issues of Apache & Tomcat   \[acus2009 511\] by Ravi Saraswathi

Presentation — 60 minutes Description
The session describes trouble shooting methods and solutions of several commonly occurring issues of web applications deployed on Apache and Tomcat. The session focuses on common causes and step-by-step instructions to resolve the problems. Some of the issues that are included in the presentation are: Application Server Hang & Core Dump, Java Virtual Machine and Memory issues (JVM Crash with no Core Dump, Out of Memory/Memory Leak), Too Many Open Files, JDBC-Database connectivity and Drivers issues, Load Balancing Issues(Apache & Tomcat connectivity with multiple hosts), SSL Trouble Shooting, High/Low CPU utilization, Slow application response, Server Core Dump, Irrecoverable Stack overflow and HTTP Session and Replication Failure. The troubleshooting methodology and solutions described in presentation will help system administrators and programmers to reduce the time spent on diagnosing problems to get to the root cause and to correct the issue. The presentation focuses on support patterns to resolve the most common problems, system behaviors, and issues. Instructions on how to resolve the issues will also be included in the presentation. The last part of the session focuses on best ways to monitor Java applications by using Open Source tools to get pre-notifications for some of the above issues. Presenter Bio Ravi is an Architect and with more than 15 years of global, professional experience. Prior to his current assignment at AOL-Time Warner, Ravi was a senior business consultant with BEA Systems. Ravi worked at BEA Systems on WebLogic and AquaLogic product line Ravi also worked with several Java webserver and application containers. His interests include Open source containers, Java, infrastructure architecture, trouble shooting methodologies and software design. Ravi has spoken number of WebLogic conferences and Java user group meetings

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Advanced Reverse Proxy Load Balancing in Apache HTTP Server 2.2 \[acus2009 418\] by Jim Jagielski Panel,Developer,Experienced,NONE,Apache HTTP Server

Presentation — 60 minutes Description
One of the main new features in Apache 2.2 is the enhancement of the proxy module, allowing Apache to proxy not only HTTP as before, but also AJP. Coupled with the dynamic load balancing capability also new in 2.2, see why Apache is now an even more capable reverse proxy, and see why mod_jk may no longer be required. Included are helpful real-world hints in configuration for high-availability failover environments. Presenter Bio Jim's been active on the 'Net since the early 80's, starting as editor of the A/UX FAQ. He worked on the NCSA server and joined the Apache Group (as it was called back then) at a very early stage. He actively contributes on HTTPD, APR and Tomcat, but also hacks on other projects (ASF and others) as well in addition to mentoring many ASF incubator podlings. In addition to being a charter and core member of the ASF Jim serves as Director and Chairman for the foundation. His real job is as Chief Architect and Principal Software Engineer for the Covalent Products Division of SpringSource. Previously, Jim served at CTO for Covalent Technologies, which was acquired by SpringSource in early 2008.

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 Improving mod_proxy : Example of an "home made" balancer: Mod_cluster   \[acus2009 439\] by Jean-Frederic Clere

Presentation — 60 minutes Description

• Summary: When using Mod_proxy + Mod_proxy_balancer Apache httpd only 2 balancer modes and reduced management support is possible. Anyway it is possible to write custom balancers to support different type of clusters. A Complete example of a balancer to front-end a dynamic cluster of Tomcat's will presented.Mod_proxy allows to * Abstract: The goal of the presentation is to demonstrate how easy it is to improve mod_proxy interaction with a cluster of Tomcats. There are different session replications mode in clusters. Full replication, Buddy replication, passive nodes for High Availability. Load balancing and failure recovery should be based on a dynamic view of the cluster not on a static description in a configuration file. Recent improvements in Mod_proxy allows the standard Mod_proxy to front-end a cluster of servers but actual ASF mod_proxy_balancer offers only 3 balancer modes (byrequest, bytraffic and bybusyness) and reduced managing support (via mod_status). What is needed to have a completely dynamic cluster: On Tomcat side a Listener to collect and transmit node informations to the balancer module and on Httpd side a balancer module able to use those informations to route incoming requests according to different loadbalancing and failure recovery policies. How it is done: A quick overview of the Tomcat listener of the example and an overview of the balancer module. Explanation the features of mod_proxy that are available to write a balancer. The mod_cluster solution: Protocol, Logic and Tomcat integration. * Expertise level: technical, intermediate * Format and duration: general presentation