I have problem with ehcache i am getting an error "Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.ehcache.org/v3]" - spring-boot

Question

I am trying to config to cache in spring boot with ehcache but i am getting an error
"org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.ehcache.org/v3]"
I have a config file named ehcache.xml in resources folder and i add it to main class as
#SpringBootApplication
#ImportResource("classpath:ehcache.xml")
public class AirsoftwebApplication {
public static void main(String[] args) {
SpringApplication.run(AirsoftwebApplication.class, args);
}
}
my config
<config xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
xmlns='http://www.ehcache.org/v3'
xsi:schemaLocation='http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core.xsd'>
<cache alias="users">
<key-type>java.lang.Long</key-type>
<value-type>com.perunsmillstone.model.entities.User</value-type>
<expiry>
<ttl>10</ttl>
</expiry>
<resources>
<offheap unit="MB">150</offheap>
</resources>
</cache>
</config>
Cache config java class
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Configuration;
#Configuration
#EnableCaching
public class CachingConfig {
}
my pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.0.M5</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.perun.smillstone</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>airsoftweb</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>12</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.4.4.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>6.0.17.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-jpamodelgen</artifactId>
<version>5.3.7.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator-cdi</artifactId>
<version>6.0.17.Final</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-amqp</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-hateoas</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jersey</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-cache</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-mail</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.9.3</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-cache</artifactId>
<version>2.2.0.RELEASE</version></dependency>
<dependency>
<groupId>javax.cache</groupId>
<artifactId>cache-api</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>org.ehcache</groupId>
<artifactId>ehcache</artifactId>
<version>3.8.1</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
<exclusion>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>io.projectreactor</groupId>
<artifactId>reactor-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
</pluginRepository>
</pluginRepositories>
</project>
Whole error
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-11-03 13:02:33.854 ERROR 11172 --- [ restartedMain] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://www.ehcache.org/v3]
Offending resource: class path resource [applicationContext.xml]
at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:72) ~[spring-beans-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:119) ~[spring-beans-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:111) ~[spring-beans-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.error(BeanDefinitionParserDelegate.java:281) ~[spring-beans-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1388) ~[spring-beans-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1371) ~[spring-beans-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:185) ~[spring-beans-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:149) ~[spring-beans-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:96) ~[spring-beans-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:513) ~[spring-beans-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:393) ~[spring-beans-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:336) ~[spring-beans-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:304) ~[spring-beans-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:188) ~[spring-beans-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:224) ~[spring-beans-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:195) ~[spring-beans-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.lambda$loadBeanDefinitionsFromImportedResources$0(ConfigurationClassBeanDefinitionReader.java:379) ~[spring-context-5.2.0.RC1.jar:5.2.0.RC1]
at java.base/java.util.LinkedHashMap.forEach(LinkedHashMap.java:684) ~[na:na]
at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsFromImportedResources(ConfigurationClassBeanDefinitionReader.java:346) ~[spring-context-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClassBeanDefinitionReader.java:147) ~[spring-context-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(ConfigurationClassBeanDefinitionReader.java:120) ~[spring-context-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:337) ~[spring-context-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:242) ~[spring-context-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:275) ~[spring-context-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:95) ~[spring-context-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:705) ~[spring-context-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:531) ~[spring-context-5.2.0.RC1.jar:5.2.0.RC1]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.0.M5.jar:2.2.0.M5]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:746) ~[spring-boot-2.2.0.M5.jar:2.2.0.M5]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:396) ~[spring-boot-2.2.0.M5.jar:2.2.0.M5]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.2.0.M5.jar:2.2.0.M5]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1225) ~[spring-boot-2.2.0.M5.jar:2.2.0.M5]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1214) ~[spring-boot-2.2.0.M5.jar:2.2.0.M5]
at com.perunsmillstone.AirsoftwebApplication.main(AirsoftwebApplication.java:17) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:567) ~[na:na]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.2.0.M5.jar:2.2.0.M5]

Answer 1

The usual way for setting up EHcache in Spring Boot is to use this property in the application.xml:
spring.cache.jcache.config=classpath:ehcache.xml
Source: https://docs.spring.io/spring-boot/docs/2.1.7.RELEASE/reference/htmlsingle/#boot-features-caching-provider-jcache
I have used it in several projects and have never configured it by importing the configuration file as a resource.