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Jetty
Eclipse Jetty® - Web Container & Clients - supports HTTP/3, HTTP/2, HTTP/1, websocket, servlets, and more
Multiple applications in the same JVM? Wildfly, Tomcat, Jetty.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Cryptography? Use Java Cryptography Extensions and Java Secure Socket Extensions with Bouncy Castle
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Weld
Weld, including integrations for Servlet containers and Java SE, examples and documentation (by weld)
Need only Dependency injection? Perhaps JBoss Weld, a reference CDI implementation, might interest you.
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Multiple applications in the same JVM? Wildfly, Tomcat, Jetty.
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Oh boy, if that's really what you're going for, you're talking low microseconds, anything slower and you'll be losing money. Also, you have to make sure the GC never triggers. Maybe look at something like Aeron
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I'm using straight up Jetty with a tiny wrapper on servlets https://github.com/bowbahdoe/rosie
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You might like Dropwizard then.