Blog: software cave

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Unexpected NullPointerException (NPE) in ternary conditional operator in Java Sometimes I come across Java code that unexpectedly throws NullPointerException in ternary operator. It is especially surprising if this par... 4 07-10-2021 07:56:24 software cave Beginners

Create text file in Java with contents Creating a text file (with given contents) is pretty straightforward task in Java. Recent Java versions and popular libraries like Apache Co... 0 05-10-2021 19:27:25 software cave Beginners

Immutable objects Most of the objects in Java are mutable. It means that their state/fields can be changed after the object was created. The examples of those... 9 15-04-2018 18:23:16 software cave Beginners

Delete directory with contents in Java Removing empty directory in Java is as simple as calling File.delete() (standard IO) or Files.delete() (NIO) method. However, if the folder ... 7 24-03-2018 10:34:47 software cave Beginners

How to delete file in Java File management (good old CRUD: create, read, update, delete) is quite common operation in software development. In this short post I would ... 6 05-03-2018 16:13:06 software cave Beginners

Mapping a map of simple types in JPA using @ElementCollection In the previous post I have shown how to easily map a collection (e.g. Set or List) of simple types in JPA. Today I would like to present ho... 4 05-03-2018 10:03:05 software cave Beginners

Mapping collection of simple type in JPA using @ElementCollection JPA framework provides good support for mapping collections of value types. The value types can be either simple types like Integer or Strin... 6 11-02-2018 13:12:42 software cave Beginners

Importing WSDL with Java and Maven SOAP web services are often used in commercial software. If we plan to use existing SOAP web service, we should receive a WSDL file which de... 6 18-02-2017 16:26:39 software cave Beginners

Objects utility class in Java Today I would like to quickly mention java.util.Objects class. The JavaDoc documentation for this class says: This class consists of static ... 7 15-02-2017 16:45:22 software cave Beginners

Default and static methods in interfaces in Java 8 Before Java 8 interfaces could only contain static fields (usually simple constants) and abstract methods. Java 8 provided the ability to de... 4 13-02-2017 16:34:58 software cave Beginners

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