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Starting Tomcat 8.5.x without that native support logs the following error:

This error is not fatal, and the application still starts with HTTP/1.1 SSL support.

Running your application with Tomcat 9.0.x and JDK9 does not require any native library to be installed. To use Tomcat 9, you can override the tomcat.version build property with the version of your choice.

75.9Configure the Web Server

Generally, you should first consider using one of the many available configuration keys and customize your web server by adding new entries in your application.properties (or application.yml , or environment, etc. see “ Section74.8, “Discover Built-in Options for External Properties” ”). The server.* namespace is quite useful here, and it includes namespaces like server.tomcat.* , server.jetty.* and others, for server-specific features. See the list of AppendixA, Common application properties .

The previous sections covered already many common use cases, such as compression, SSL or HTTP/2. However, if a configuration key doesn’t exist for your use case, you should then look at WebServerFactoryCustomizer . You can declare such a component and get access to the server factory relevant to your choice: you should select the variant for the chosen Server (Tomcat, Jetty, Reactor Netty, Undertow) and the chosen web stack (Servlet or Reactive).

The example below is for Tomcat with the spring-boot-starter-web (Servlet stack):

In addition Spring Boot provides:

Once you’ve got access to a WebServerFactory , you can often add customizers to it to configure specific parts, like connectors, server resources, or the server itself - all using server-specific APIs.

As a last resort, you can also declare your own WebServerFactory component, which will override the one provided by Spring Boot. In this case, you can’t rely on configuration properties in the server namespace anymore.

75.10Add a Servlet, Filter, or Listener to a Application

In a servlet stack application, i.e. with the spring-boot-starter-web , there are two ways to add Servlet , Filter , ServletContextListener , and the other listeners supported by the Servlet API to your application:

75.10.1Add a Servlet, Filter, or Listener by Using a Spring Bean

To add a Servlet , Filter , or Servlet *Listener by using a Spring bean, you must provide a @Bean definition for it. Doing so can be very useful when you want to inject configuration or dependencies. However, you must be very careful that they do not cause eager initialization of too many other beans, because they have to be installed in the container very early in the application lifecycle. (For example, it is not a good idea to have them depend on your DataSource or JPA configuration.) You can work around such restrictions by initializing the beans lazily when first used instead of on initialization.

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Auto scaling is an old selling point for AWS and cloud services in general, but asurprising number of production applications don’t auto-scale. There are several legitimate reasons for this:

There are alsotoo many applications lying around that should have been auto-scaled and never have (cough, cough, NZ Sky GO, cough). It is best to design your application to handle auto-scaling from the start, which then gives us the option of using it when it becomes necessary. We don’t want to scare people away just because our web services are too slow, do we?

When we talk about building cloud applications we always mention auto-scaling and how all our applications should scale up and down as they need to. What we don’t really talk about are good practices to follow when we are building apps that need to scale. Here are some useful things to keep in mind when building applications for the cloud.

StatelessEverywhere

Keeping your applications stateless is a good practice to get into. It really helps when scaling out applications as connections can be routed to different servers which may not have the local state stored on them. Storing the state outside of the application (Memcache or Redis is a good location) allows important information to be loaded on the fly when an incoming connection gets routed to a new server.

When we select data storage locations for our application we must make sure that they can scale when our need to scale arises. The first step here is to assess all the datastores available to us and selecting one that scales well.Once we have selected our datastore we need to set it up properly from the beginning. This means setting them up with clustering enabled and being ready to increase the size of the cluster when we need to. This helps toprevent a migration headache that can be caused by needing to enable clustering on a database already in use.

One of the most underrated features required by scaling applications is monitoring. Proper monitoring of our systems allows developers to see where the services are performing the slowest and what resources those services are using the most. Building the capability for monitoring the system and alerting you to failures before using the system in used in anger is very important, even if you don’t build nice graphs or tidy reports from day one.

There are a number of key metrics we can use to scale up and down on-demand. Here are a few of the good ones to use as input for managing the scaling.

Number of active connections If you know your application performs poorly over a certain number of connections per server then the number of active connections is a good metric to start scaling up.

Number of active connections
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by Tim Gray | Mar 30, 2017 | CloudBI | 0 comments

Auto scaling is an old selling point for AWS and cloud services in general, but asurprising number of production applications don’t auto-scale. There are several legitimate reasons for this:

There are alsotoo many applications lying around that should have been auto-scaled and never have (cough, cough, NZ Sky GO, cough). It is best to design your application to handle auto-scaling from the start, which then gives us the option of using it when it becomes necessary. We don’t want to scare people away just because our web services are too slow, do we?

When we talk about building cloud applications we always mention auto-scaling and how all our applications should scale up and down as they need to. What we don’t really talk about are good practices to follow when we are building apps that need to scale. Here are some useful things to keep in mind when building applications for the cloud.

StatelessEverywhere

Keeping your applications stateless is a good practice to get into. It really helps when scaling out applications as connections can be routed to different servers which may not have the local state stored on them. Storing the state outside of the application (Memcache or Redis is a good location) allows important information to be loaded on the fly when an incoming connection gets routed to a new server.

When we select data storage locations for our application we must make sure that they can scale when our need to scale arises. The first step here is to assess all the datastores available to us and selecting one that scales well.Once we have selected our datastore we need to set it up properly from the beginning. This means setting them up with clustering enabled and being ready to increase the size of the cluster when we need to. This helps toprevent a migration headache that can be caused by needing to enable clustering on a database already in use.

One of the most underrated features required by scaling applications is monitoring. Proper monitoring of our systems allows developers to see where the services are performing the slowest and what resources those services are using the most. Building the capability for monitoring the system and alerting you to failures before using the system in used in anger is very important, even if you don’t build nice graphs or tidy reports from day one.

There are a number of key metrics we can use to scale up and down on-demand. Here are a few of the good ones to use as input for managing the scaling.

Number of active connections If you know your application performs poorly over a certain number of connections per server then the number of active connections is a good metric to start scaling up.

Number of active connections
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