Dependencies

Add the following to your pom

 		<dependency> 			<groupId>org.springframework.boot</groupId> 			<artifactId>spring-boot-starter-cache</artifactId> 		</dependency> 		<dependency> 		    <groupId>org.ehcache</groupId> 		    <artifactId>ehcache</artifactId> 		</dependency> 		<dependency> 		    <groupId>javax.cache</groupId> 		    <artifactId>cache-api</artifactId> 		</dependency>

Cache configuration

Keep the following ehcache.xml under src/main/resources

 <?xml version="1.0" encoding="UTF-8"?> <config xmlns='http://www.ehcache.org/v3'>  	<persistence directory="${java.io.tmpdir}" />  	<!-- Default cache template --> 	<cache-template name="default"> 		<expiry> 			<tti unit="hours">4</tti> 			<!-- <ttl unit="minutes">2</ttl> --> 		</expiry> 		<listeners> 			<listener> 				<class>com.org.lob.support.LoggingTaskCacheListener</class> 				<event-firing-mode>ASYNCHRONOUS</event-firing-mode> 				<event-ordering-mode>UNORDERED</event-ordering-mode> 				<events-to-fire-on>CREATED</events-to-fire-on> 				<events-to-fire-on>EXPIRED</events-to-fire-on> 				<events-to-fire-on>REMOVED</events-to-fire-on> 				<events-to-fire-on>UPDATED</events-to-fire-on> 			</listener> 		</listeners> 		<resources> 			<heap unit="MB">10</heap> 			<offheap unit="MB">50</offheap> 			<disk persistent="true" unit="GB">1</disk> 		</resources> 		<!--  		<heap-store-settings> 			<max-object-graph-size>2000</max-object-graph-size> 			<max-object-size unit="kB">5</max-object-size> 		</heap-store-settings> 		--> 	</cache-template>  	<!-- Cache configurations --> 	<cache alias="books" uses-template="default" > 		<key-type>java.lang.String</key-type> 		<value-type>com.org.lob.project.repository.entity.Book</value-type>		 	</cache>  	<cache alias="files" uses-template="default" > 		<key-type>java.lang.String</key-type> 		<value-type>java.lang.String</value-type>		 	</cache>  </config>

Spring Boot Config

Add the following to your application.properties

 # Cache spring.cache.jcache.config=classpath:ehcache.xml

Add the following spring boot config

 import org.springframework.cache.annotation.EnableCaching; import org.springframework.context.annotation.Configuration;  @Configuration @EnableCaching public class CacheConfig { 	 }

Start Caching

  @Component @CacheConfig(cacheNames = "books") public class SimpleBookRepository implements BookRepository { 	 	@Cacheable 	@Override 	public Book getByIsbn(String isbn) { 		simulateSlowService(); 		return new Book(isbn, "Some book"); 	}  	// Don't do this at home 	private void simulateSlowService() { 		try { 			long time = 3000L; 			Thread.sleep(time); 		} catch (InterruptedException e) { 			throw new IllegalStateException(e); 		} 	} } 
  @Component @CacheConfig(cacheNames = "files") public class SimpleFileRepository implements FileRepository {  	private static final Logger LOGGER = LoggerFactory.getLogger(SimpleFileRepository.class);  	@Override 	@Cacheable 	public String load(String project) { 		return asString(new FileSystemResource(project)); 	}  	@Override 	@CachePut 	public String reLoad(String project) { 		return asString(new FileSystemResource(project)); 	}  	private String asString(Resource resource) {         try (Reader reader = new InputStreamReader(resource.getInputStream(), UTF_8)) {             return FileCopyUtils.copyToString(reader);         } catch (IOException e) {         	LOGGER.error("Error Proessing ", e);             throw new UncheckedIOException(e);         }     } }
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