ClassNotFoundException: CandidateComponentsIndexLoader

Trouble Shooting

When I am using implementation 'org.springframework.boot:spring-boot-starter-data-jpa' library, and I get below error when project build.

Caused by: java.lang.NoClassDefFoundError: org/springframework/context/index/CandidateComponentsIndexLoader
	at org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager.setResourceLoader(DefaultPersistenceUnitManager.java:431)
	at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.setResourceLoader(LocalContainerEntityManagerFactoryBean.java:320)
	at org.springframework.context.support.ApplicationContextAwareProcessor.invokeAwareInterfaces(ApplicationContextAwareProcessor.java:112)
	at org.springframework.context.support.ApplicationContextAwareProcessor.postProcessBeforeInitialization(ApplicationContextAwareProcessor.java:97)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:416)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1691)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:573)
	... 63 more
Caused by: java.lang.ClassNotFoundException: org.springframework.context.index.CandidateComponentsIndexLoader
	at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 70 more

org/springframework/context/index/CandidateComponentsIndexLoader This class is not in project, so I searched this class and found this class is in latest spring-context library.

Here is document of this class, “docs.spring.io/CandidateComponentsIndexLoader”

upgrade spring-context version from 4.x.x to 5.x.x

dependency("org.springframework:spring-context:5.0.4.RELEASE")