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Comment: Add mention of containerSciFilter option of Context (Though I do not have time for a lengthy explanation now).

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In Tomcat 8 there are several options available. You can use a system property or configure a <JarScanFilter> element in the context file of your web application.

Disable WebSocket support

There exists an attribute on Context element, containerSciFilter. It can be used to disable container-provided features that are plugged into Tomcat via SCI API: WebSocket support (in Tomcat 7 and later), JSP support (in Tomcat 8 and later).

The class names to filter can be detected by looking into META-INF/services/javax.servlet.ServletContainerInitializer files in Tomcat JARs. For WebSocket support the name is org.apache.tomcat.websocket.server.WsSci, for JSP support the name is org.apache.jasper.servlet.JasperInitializer.

TODO: Configuration example

TODO: How much faster does it make it? In short: Delays due to annotation scanning caused by WebSocket have been already mentioned in another paragraphs on this page. This is an alternative to removing websocket JARs from Tomcat installation.

References: Bug 55855, Tomcat 8 Context documentation

Entropy Source

Tomcat 7+ heavily relies on SecureRandom class to provide random values for its session ids and in other places. Depending on your JRE it can cause delays during startup if entropy source that is used to initialize SecureRandom is short of entropy. You will see warning in the logs when this happens, e.g.:

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