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Tag Archives: Java
Database schema creation in JPA using SQL scripts
Recent versions of JPA provide a feature to automatically create the database objects (like tables, sequences or indexes), load initial data into database on application deployment; and also remove them after the application is undeployed. All that is needed is … Continue reading
Reading text file line by line in Java
Reading text files from hard disk is quite common task in software development practice. Usually we are interested in processing it line by line. In this article I would like to present few popular ways how to do it easily … Continue reading
Iterating through Java list backwards
The most natural method of iterating through a list in Java is to start from the first element of the list and then move forward until the last one is reached. While this is the most common, it is sometimes … Continue reading
Usage of serialVersionUID in Java serialization
Java run-time associates with each serializable class a special version number known as serialVersionUID. This number is later used during deserialization process to verify if the application which performed the serialization and the application which is doing the deserialization have … Continue reading
Creating executable jar file with Maven
Building an executable jar file with maven-jar-plugin is fairly easy. However, it has one disadvantage that the Maven dependencies are not packaged together inside the resulting jar file but have to be stored separately on the file system and added … Continue reading
Primary key generation in JPA
Generation of primary key values is a very important functionality of relational database management systems. The main idea is to let RDBMS automatically calculate and assign primary key value to the row being inserted into the database table. This not … Continue reading
Charts with jqPlot, Spring REST, AJAX and JQuery
One of the most notable features of HTML5 is Canvas API which provides a rectangular region for custom drawing. There are several uses of it like: building games, image compositions, animations but this time we will see how to use … Continue reading
Adding external/custom jars into Maven project
One of the strongest points of Maven is that it automatically manages project dependencies. The developer just needs to specify which dependencies and in which version are needed and the Maven takes care of the rest including downloading and storing … Continue reading
Integrating Hibernate with Spring
When building a web application, we will sooner or later need to somehow store data entered by users and retrieve it later. In most cases the best place to keep such data is a database because it additionally provides many … Continue reading
Repeating annotations in Java 8
In Java 7 and before attaching more than one annotation of the same type to the same part of the code (e.g. a class or a method) was forbidden. Therefore, the developers had to group them together into single container … Continue reading
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