How-to articles, tricks, and solutions about JAVA
Why do I get an UnsupportedOperationException when trying to remove an element from a List?
The java.lang.UnsupportedOperationException is thrown when an operation is not supported by a class.
What's the difference between JPA and Hibernate?
Java Persistence API (JPA) is a specification for object-relational mapping (ORM) in Java.
How do I set environment variables from Java?
To set an environment variable from Java, you can use the System.setProperty() method.
How to check if my string is equal to null?
To check if a string is equal to null in Java, you can use the == operator.
I need to convert an int variable to double
To convert an int to a double, you can use the doubleValue() method of the Integer class.
How do you return a JSON object from a Java Servlet
To return a JSON object from a Java Servlet, you can use the following steps: