How to use setenv.sh or setenv.bat script in Apache Tomcat? Exporting environment variables using Tomcat’s setenv script
How to use setenv.sh or setenv.bat script in Apache Tomcat
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How to customize Spring Security’s AuthenticationFailureHandler in a Spring Boot application?
We handle successful authentications by implementing the onAuthenticationSuccess() method of Spring Security’s AuthenticationSuccessHandler Interface. We write our own code to handle the activities and flow for successfully logged in users. Similarly we can handle the authentication failures using Spring Security’s AuthenticationFailureHandler Interface. Spring handles authentication failures and redirect users to the login page by itself […]
Continue ReadingHow to use Hibernate’s @ColumnTransformer annotaion? How to format or modify a database column value using @ColumnTransformer?
Let me give you an introduction. If you want to skip and jump quickly into the implementation part then scroll down to the Examples section. First of all, what is an SQL Expression? It’s a combination of one or more values, operators and SQL functions that evaluates to a value. We usually use queries combined […]
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What is Java Call Stack?
To start with, what does an Exception mean? It is an event that disrupts the normal flow of a program’s execution. When an exception is thrown from inside a method, the Java Runtime System attempts to find an ordered list of methods that had been called to reach the method where the error occurred. This […]
Continue ReadingWhat is Thread Scheduling in Java?
Execution of multiple threads/tasks on a single processor is called Thread Scheduling. Scheduling can mainly be of two types. 1) Preemptive scheduling 2) Time-sliced scheduling In Preemptive scheduling, the thread with the highest priority runs first. it keeps running until it reaches wait or dead stage or a higher priority thread comes. In Time-sliced scheduling, […]
Continue ReadingerrorPage attribute of JSP Page directive
As you all know, errorPage attribute of JSP page directive is used to take the user to an error page (which may be common for all the pages) in case of any exceptions. Guess what will be the result if we try to load the following JPS files. 1) first.jsp it has the following statements […]
Continue ReadingPrimitive datatypes in java
8 primitive types in java are int, char, byte, float, double, boolean, short and long. Everything in java is not an object. Primitive datatypes are included in java for performance reasons. For primitive types, we don’t use the new keyword. Using new will place the objects in heap, which would be very costly for small […]
Continue ReadingConverting documents between different office formats in Java using JOD converter
Sometimes we will need our application to do a conversion between file formats. Out of these the most common is any format to PDF. Have a look @ this It is the JOD converter that can be used for this. It has a good number of input and output file format options. You can download […]
Continue ReadingVoice Recording and Playback in Java
You may need to integrate a voice recorder in to your application and play the recorded voice message later. Following is one of many options. Main java classes used to capture audio are, the following. AudioSystem AudioInputStream AudioFormat TargetDataLine DataLine.Info You will need to import javax.sound.sampled.* as these are included in javax.sound.sampled package. This package […]
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