Inversion of control(IOC) and Dependency Injection(DI) in Spring Framework

In this tutorial, we will learn the basic concept of Inversion of control and Dependency Injection. The core of the spring framework is based on the IOC principle. IOC and DI are closely related concepts. They describe the different aspects of how the spring manages the objects and their interaction. Let's look into each concept. Inversion of Control(IOC) IOC is a design principle where the control...

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Caused by java.io.IOException: CreateProcess error=206, The filename or extension is too long

While working on Java gradle project sometimes we might get the following error in Windows system: Caused by: java.io.IOException: CreateProcess error=206, The filename or extension is too long This is due to when classpath for a Gradle JavaExec or Test task is long, Windows command executions give an error because of the limitation to command line length greater than 32K With a number of classpath...

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Mail Sending Issue in Java Application

Sometimes while sending the mail in the Java application we might get the following issue. org.springframework.mail.MailSendException: Mail server connection failed; nested exception is com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.gmail.com, 465; timeout -1; nested...

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Convert Date to Pretty Time in Grails and Groovy

In this tutorial, we will learn how to convert Java Date to pretty time like moments ago, 1 hour ago, 1 week ago, 1 month ago, 1 year ago, and so on in grails application. For this, we are using the prettytime plugin in our project. Load PrettyTime in Grails Gradle project: Add the following inside dependencies in the build.gradle file. dependencies { //other dependencies compile 'org.grails.plugins:grails-pretty-time:4.0.0' } PrettyTime...

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Convert Java Date to Pretty Time in Java

In this tutorial, we will learn how to convert Java Date to pretty time like moments ago, 1 hour ago, 1 week ago, 1 month ago, 1 year ago, and so on. For this, we are using the prettytime dependency in our project. If we are using a jar file download the desired jar file from the Maven repository and load the jar file in the application. Please follow How to add external jar or library on IntelliJ...

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Java format date string to date and vice versa

This is a quick tutorial on formatting date in the string to java Date and Date to a date in string. Let's create a sample Java class called DateTimeUtils.java. Parse Date String to Date: Let's look into the example that we want to parse the date string 2022-08-22 or 2022-08-22 04:22:100 to Date. import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; public class...

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Setup Http client for API using OkHttp in Java

In this tutorial, we will learn how to use OkHttp for HTTP requests while consuming APIs. OkHttp is an HTTP client which will do HTTP efficiently by loading faster and saving bandwidth. Using OkHttp is easy. Its request/response API is designed with fluent builders and immutability. It supports both synchronous blocking calls and async calls with callbacks. Setup the OkHttp dependency: If we are using...

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Java round double to decimal places with up and down rounding

This is a quick tutorial on how we can round the double or float value to x decimal places Here we are using DecimalFormat class to do so. Let's look at the example. Here we are creating DecimalFormatter.java class Round to x decimal places: import java.text.DecimalFormat; public class DecimalFormatter { public static void main(String[] args) { // normal format System.out.println("Normal...

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Setup and run Appium for Android with Java client on Linux

How to set up and run Appium for android apps with Java client with Emulator setup. Table Of Contents 1. Introduction 2. Prerequisites 3. Download and run Appium 4. Setup android Emulator 5. Download...

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Tomcat Invalid character found in the request target

While running an application in the tomcat server, sometimes we might get the following error. org.apache.coyote.http11.Http11Processor.service Error parsing HTTP request header Note: further occurrences of HTTP request parsing errors will be logged at DEBUG level. java.lang.IllegalArgumentException:...

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Install OpenCv in Linux/Ubuntu for Java Application.

Table Of Contents - Introduction - Download OpenCV - Build OpenCV - Run Sample Example 1. Introduction: In this blog post, we are going to install and set...

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Read Dicom file meatadata using dcm4che in Java

How to read Dicom file metadata using dcm4che in Java. dcm4che is a collection of open-source applications and utilities for the healthcare enterprise application for processing, manipulating, and analysis of medical images. Please follow the tutorial for setting the dcm4che in our java application. Let's create a java class DicomMetadataReader.java to read the available metadata in the given Dicom...

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Read the Dicom header information using dcm4che in Java

In this tutorial, we are going to learn how to get the Dicom file header information using dcm4che. DICOM (Digital Imaging and Communications in Medicine) is the ubiquitous standard in the radiology and cardiology imaging industry for the exchange and management of images and image-related information.For Dicom standard information please visit Dicom Library. Before start writing code we need to use...

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Read the files inside directory(folder) and subdirectory(sub folder) using Java 8+

In this tutorial, we are going to learn how we can read all the files and specific files inside the directory and subdirectory. Let's create a sample class FileReader.java Read all the directory subdirectory and files: public static void main(String[] args) { String directoryPath = "path_to_directory"; try { List<String> allFiles = listFiles(directoryPath); ...

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How to unzip the zip file and zip the folder in Java

In this tutorial, we are going to learn how to zip the given folder and unzip the zip file using Java. Zip the folder or directory: Let's create a java class ZipUnzip.java and create the main method. public static void main(String[] args) { String folderInputPath = "path/of/folder/to/zip"; String outputPath = "output/path/compressed.zip"; try { zip(folderInputPath,...

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Read Dicom Image metadata using PixelMed in Java

In this tutorial, we are going to learn how to get Dicom image metadata using PixelMed toolkit using Java. DICOM (Digital Imaging and Communications in Medicine) is the ubiquitous standard in the radiology and cardiology imaging industry for the exchange and management of images and image-related information. DICOM is also used in other images related medical fields, such as pathology, endoscopy,...

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Update the Dicom image metadata using Java

In this tutorial, we are going to learn how we can update the Dicom image metadata for the Dicom file. We are using the SimpleITK library for this. SimpleITK library is very handy while working on medical image manipulation, processing, and analysis. Please follow our previous tutorial before starting this tutorial. Simple Itk Installation for Java Application.Read the Dicom Image metadata using Java Let's...

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How to convert byte arrays to other data type and vice versa in Java

In this tutorial, we are going to learn how we can convert byte arrays to other data types like int, float, double, and vice versa. This conversion is the best practice for data transfer between different channels, I/O operations. By doing so, we can serialize and deserialize without changing the underlying data. If we want to create the binary files of different data types then first convert...

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