It’s hard to get good data from a profiler for startup because the JVM isn’t warm yet, and it’s such a brief process. Setting the CPU sample interval to 1ms helps, and remember always to switch off filters in the UI (they filter out Spring classes by default).
Includes actuator and MVC and uses Spring Boot 1.5.4. Startup time approx 1100ms without the profiler.
Nothing from Spring Boot makes it into the top 10 hostspots, but
Spring is there (ConfigurationClassPostProcessor and friends). The
first thing we see on the list from Spring Boot is the
BackgroundPreinitializer at number 13 which is designed to be a
performance hit but happens in a background thread. The most expensive
thing that actually happens in Spring Boot in a blocking thread is
condition evaluation (right down at number 36), accounting for about
7% of startup time. OnBeanCondition and OnPropertyCondition are
the top two if you follow down the call stack.
| Method | Time (ms) | Count | |
|---|---|---|---|
1 |
java.lang.ClassLoader.loadClass(String) ClassLoader.java |
2611 |
8008 |
2 |
sun.misc.Launcher$AppClassLoader.loadClass(String, boolean) Launcher.java |
2609 |
8006 |
3 |
java.lang.ClassLoader.loadClass(String, boolean) ClassLoader.java |
2598 |
10800 |
4 |
java.net.URLClassLoader.findClass(String) URLClassLoader.java |
2397 |
5013 |
5 |
java.net.URLClassLoader$1.run() URLClassLoader.java |
2359 |
5413 |
6 |
java.net.URLClassLoader$1.run() URLClassLoader.java |
2357 |
5413 |
7 |
org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(Collection, BeanDefinitionRegistry) PostProcessorRegistrationDelegate.java |
2241 |
2 |
8 |
org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(BeanDefinitionRegistry) ConfigurationClassPostProcessor.java |
2241 |
1 |
9 |
org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(BeanDefinitionRegistry) ConfigurationClassPostProcessor.java |
2241 |
1 |
10 |
java.lang.Thread.run() Thread.java |
2048 |
3 |
11 |
org.springframework.context.annotation.ConfigurationClassParser.parse(Set) ConfigurationClassParser.java |
1647 |
1 |
12 |
org.springframework.boot.autoconfigure.BackgroundPreinitializer$1.run() BackgroundPreinitializer.java |
1492 |
1 |
13 |
org.springframework.boot.autoconfigure.BackgroundPreinitializer$1.runSafely(Runnable) BackgroundPreinitializer.java |
1487 |
5 |
14 |
org.springframework.context.annotation.ConfigurationClassParser.processDeferredImportSelectors() ConfigurationClassParser.java |
1470 |
1 |
15 |
sun.misc.URLClassPath.getResource(String, boolean) URLClassPath.java |
1386 |
5710 |
16 |
java.net.URLClassLoader.defineClass(String, Resource) URLClassLoader.java |
1296 |
2412 |
17 |
java.security.SecureClassLoader.defineClass(String, byte[], int, int, CodeSource) SecureClassLoader.java |
1021 |
2412 |
18 |
java.lang.ClassLoader.defineClass(String, byte[], int, int, ProtectionDomain) ClassLoader.java |
1008 |
2447 |
19 |
org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClass) ConfigurationClassParser.java |
992 |
60 |
20 |
sun.misc.URLClassPath$JarLoader.getResource(String, boolean) URLClassPath.java |
924 |
100466 |
21 |
org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClass, ConfigurationClassParser$SourceClass) ConfigurationClassParser.java |
922 |
41 |
22 |
org.springframework.boot.autoconfigure.BackgroundPreinitializer$MBeanFactoryInitializer.run() BackgroundPreinitializer.java |
840 |
1 |
23 |
org.apache.catalina.mbeans.MBeanFactory.<clinit>() MBeanFactory.java |
838 |
2 |
24 |
org.springframework.context.annotation.ConfigurationClassParser.processImports(ConfigurationClass, ConfigurationClassParser$SourceClass, Collection, boolean) ConfigurationClassParser.java |
832 |
55 |
25 |
org.apache.catalina.mbeans.MBeanUtils.<clinit>() MBeanUtils.java |
824 |
2 |
26 |
org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(String) SimpleMetadataReaderFactory.java |
708 |
442 |
27 |
org.springframework.context.annotation.ConditionEvaluator.shouldSkip(AnnotatedTypeMetadata, ConfigurationCondition$ConfigurationPhase) ConditionEvaluator.java |
705 |
162 |
28 |
org.springframework.context.annotation.ConfigurationClassParser.asSourceClass(String) ConfigurationClassParser.java |
675 |
909 |
29 |
org.apache.catalina.mbeans.MBeanUtils.createRegistry() MBeanUtils.java |
650 |
2 |
30 |
org.apache.tomcat.util.modeler.Registry.loadDescriptors(String, ClassLoader) Registry.java |
647 |
15 |
31 |
org.apache.tomcat.util.modeler.Registry.load(String, Object, String) Registry.java |
638 |
13 |
32 |
org.apache.tomcat.util.modeler.modules.MbeansDescriptorsDigesterSource.execute() MbeansDescriptorsDigesterSource.java |
629 |
13 |
33 |
org.apache.tomcat.util.modeler.modules.MbeansDescriptorsDigesterSource.loadDescriptors(Registry, String, Object) MbeansDescriptorsDigesterSource.java |
629 |
13 |
34 |
org.apache.tomcat.util.digester.Digester.parse(InputStream) Digester.java |
608 |
13 |
35 |
org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(ConditionContext, AnnotatedTypeMetadata) SpringBootCondition.java |
571 |
144 |