Ehcache implementation using Spring framework

The terms “buffer” and “cache” tend to be used interchangeably; note however they represent different things. A buffer is used traditionally as an intermediate temporary store for data between a fast and a slow entity. As one party would have to wait for the other affecting performance, the buffer alleviates this by allowing entire blocks of data to move at once rather then in small chunks. The data is written and read only once from the buffer. Furthermore, the buffers are visible to at least one party which is aware of it.

A cache on the other hand by definition is hidden and neither party is aware that caching occurs.It as well improves performance but does that by allowing the same data to be read multiple times in a fast fashion.
For more information please read

At its core, the abstraction applies caching to Java methods, reducing thus the number of executions based on the information available in the cache. That is, each time a targeted method is invoked, the abstraction will apply a caching behavior checking whether the method has been already executed for the given arguments. If it has, then the cached result is returned without having to execute the actual method; if it has not, then method is executed, the result cached and returned to the user so that, the next time the method is invoked, the cached result is returned. This way, expensive methods (whether CPU or IO bound) can be executed only once for a given set of parameters and the result reused without having to actually execute the method again. The caching logic is applied transparently without any interference to the invoker.

For this tutorial we will create a standalone maven project in Eclipse. If you already have an idea on how to create a maven project in Eclipse will be great otherwise I will tell you here how to create a maven project in Eclipse.


The following configurations are required in order to run the application

JDK 1.8
Have maven installed and configured
Spring dependencies in pom.xml

Now we will see the below steps how to create a maven based spring project in Eclipse

Step 1. Create a standalone maven project in Eclipse

Go to File -> New -> Other. On popup window under Maven select Maven Project. Then click on Next. Select the workspace location – either default or browse the location. Click on Next. Now in next window select the row as highlighted from the below list of archtypes and click on Next button.


Now enter the required fields (Group Id, Artifact Id) as shown below

Group Id : com.roytuts
Artifact Id : ehcache

Step 2. Modify the pom.xml file as shown below.

Step 3. If you see JRE System Library[J2SE-1.5] then change the version by below process

Do right-click on the project and go to Build -> Configure build path, under Libraries tab click on JRE System Library[J2SE-1.5], click on Edit button and select the appropriate jdk 1.8 from the next window. Click on Finish then Ok.

Step 4. Create src/main/resources folder for putting the resource files.

Do right-click on the project and go New -> Source Folder. Give Folder name: as src/main/resources and click on Finish button.

Step 5. Create an XML file under src/main/resources.

Do right-click on src/main/resources in the project and go New -> file. Create two files. Give File name: as ehcache.xml and spring-config.xml and click on Finish button.

ehcache.xml file contains below content

spring-config.xml file contains below content

Step 6. Create class with below source code

Step 7. Craete a test class for testing ehcache

Step 8. Now run the above test class, you will get the below output

So, how will we detect whether ehcache is working or not ?

Well, we see in the output that “getListOfEmployees is running…” and “findEmployeeByName is running…” are printed inside the methods only once for the same set of parameters and for the subsequent calls the System.out.println() has not been executed. It means for the first time only methods were invoked but for subsequent calls the values were retrieved from the cache.

Thanks for reading.


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