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Java App Servers

Java application servers that support the Java EE platform and features include JOnAS from Object Web, WildFly (formerly JBoss AS) from JBoss, Geronimo from Apache, TomEE from Apache, Resin Java Application Server from Caucho Technology, Blazix from Desiderata Software, Enhydra Server from Enhydra.org, and GlassFish from Oracle. Commercial Java app servers include WebLogic by Oracle, WebSphere from IBM and the open source JBoss Enterprise Application Platform (JBoss EAP) by Red Hat.

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It seems like an entropy daemon like "haveged" (http://www.issihosts.com/haveged/) can significantly reduce Tomcat start up times.  Java uses /dev/random by default to initialize seed generators.  Problem is, if the entropy pool on a machine is depleted, /dev/random will block until enough environment noise has been gathered to generate sufficient entropy. haveged helps keeps the entropy pool filled up.
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by:Brandon Lyon
This is another example of why backends can be hard to get right and are more difficult than they seem. There are so many important minor details.
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Java App Servers

Java application servers that support the Java EE platform and features include JOnAS from Object Web, WildFly (formerly JBoss AS) from JBoss, Geronimo from Apache, TomEE from Apache, Resin Java Application Server from Caucho Technology, Blazix from Desiderata Software, Enhydra Server from Enhydra.org, and GlassFish from Oracle. Commercial Java app servers include WebLogic by Oracle, WebSphere from IBM and the open source JBoss Enterprise Application Platform (JBoss EAP) by Red Hat.

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