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What is MongoDB In this post you will see how to install and running MongoDB database server on Windows 7. What is MongoDB? MongoDB is a NoSQL database. MongoDB is a non-relational JSON document store, a document oriented database. Non-relational means that it does not support the relational algebra that most often expressed in SQL […]
Using Spring Expression Language (SpEL) we can filter a collection based on some criteria. We can also create a projection of a collection by collecting only a particular property from the collection objects. Now you know that you have two good features of SpEL that are really powerful to use when working with collection objects […]
In this example you will learn how to create a projection of a collection object. Using projection we can create a new collection with only a specific property from the original collection. As an example, instead of returning a collection of Book objects we would like only to have the titles of the books. To […]
In previous examples you have seen that we use the square-braces [] operator to select items from collection. In this post you will learn how to filter members of a collection with a certain criteria using the Spring EL. To do this Spring EL give you another special operator, the filter operator which can be […]
Previously you have seen that we can load properties file and read a value from it in this example: How do I read a value from properties file using Spring EL?. In this example you will learn how to read a special properties available to Spring EL. These properties include the systemEnvironment and systemProperties. The […]
In the previous two examples you have seen how to access member of a collection and access a map element using the square-braces [] operator in Spring EL. In this example you will see how to use the [] operator to read a value from a properties file or java.util.Properties. Let’s say we have a […]
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