![]() Also, startup time will decrease: c.b.springStart.SpringStartApplication : Started SpringStartApplication in 3.193 seconds (JVM running for 3.686) We'll get a warning from JVM that this option is deprecated. This option disables the verifier completely and will reduce startup time significantly. This setup will have a significant negative performance impact on startups. -Xverify:all enables verification of all classes.-Xverify is the default value and enables verification on all non-bootloader classes.There are a couple of options for this flag: Bytecode verification provides whether classes are properly formated and within JVM specification constraints. Spring will use it automatically during startup: During compile-time, Spring will create an additional file in META-INF\ponents. Spring doesn't require any additional configuration. We need to add a dependency to the spring-context-indexer to generate the index. We can improve startup time by creating a static index when we have a large codebase. Spring classpath scanning is fast action. The following minor improvement can be in the classpath scan. To switch to Undertow, we need to change pom.xml: It requires less memory and has a better average response time. In tests, Undertow from JBoss performs better than Tomcat or Jetty. While Tomcat is good enough in most cases, other servlet containers can be more performant. Spring Boot comes with an embedded servlet container. This can result in ClassNotFoundException during runtime. Because Spring needs time to initialize the required beans, another disadvantage is that we can miss some errors on startup. The most significant disadvantage is that the application will serve the first request slower. However, lazy initialization has a few drawbacks. An increased number of restarts with lazy initialization will enable JVM to optimize the code better. The reduction depends on the dependency graph of our application.Īlso, lazy initialization has benefits during development while using DevTools hot restart functionality. Lazy InitializationĪfter building a new jar file and starting it as in the previous example, the new startup time is slightly better: c.b.springStart.SpringStartApplication : Started SpringStartApplication in 2.95 seconds (JVM running for 3.497)ĭepending on the size of our codebase, lazy initialization can result in a significant amount of startup time reduction. We'll use this time as a reference for future tweaks. ![]() We run our jar file with the standard java -jar command and monitor the start time of our application: c.b.springStart.SpringStartApplication : Started SpringStartApplication in 3.403 seconds (JVM running for 3.961)Īs we can see, our application starts at approximately 3.4 seconds. In pom.xml, we'll add spring-boot-maven-plugin with configuration to pack our application in a jar file: Ĭom. We'll use Spring Boot version 2.5.4 with Spring Web, Spring Actuator, and Spring Security as dependencies. Before we start, let's set up a test application. ![]()
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