Posts (page 104)
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10 min readTo deploy a Spring Boot application in Kubernetes, you need to follow a few steps:Containerize the Spring Boot application: Create a Dockerfile that includes the necessary dependencies and configurations for running your Spring Boot application. Build a Docker image of your application using tools like Docker CLI or Maven plugins. Container registry: You need to push your Docker image to a container registry like Docker Hub or a private registry accessible by your Kubernetes cluster.
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11 min readTo generate PDFs in Spring Boot, you can follow these steps:Add the necessary dependencies: Include the required dependencies in your Maven or Gradle build file. Typically, you need the spring-boot-starter-web and spring-boot-starter-thymeleaf dependencies. Create the PDF template: Design a Thymeleaf template for your PDF. You can define the layout, content, and styling of the PDF using HTML and CSS.
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11 min readTo upload files in Spring Boot, you need to follow these steps:Create a form in your front-end application to allow users to select a file to upload. The form should have an input field of type "file" and an HTML form tag. In your Spring Boot application, create a controller that handles the file upload request. Annotate the controller class with @RestController or @Controller annotation. Define a method inside the controller that maps to the HTTP POST request for uploading files.
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17 min readTo connect a Spring Boot backend with a React frontend, you need to follow these steps:Set up a Spring Boot backend: Create a new Spring Boot project with the desired dependencies using a build tool like Maven or Gradle. Configure your backend application by defining necessary RESTful endpoints and data models using annotations such as @RestController and @Entity.
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11 min readTesting a repository in Spring Boot involves setting up a test environment and implementing test cases to validate the functionality of the repository. Here is a general approach to test a repository in Spring Boot:Set up the test environment: Create a test class using a testing framework like JUnit or Mockito. Annotate the test class with the appropriate annotations, such as @RunWith and @DataJpaTest, to configure the test environment.
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9 min readTo configure Kafka in Spring Boot, follow these steps:Start by adding the required dependencies in your Spring Boot project's pom.xml file. These dependencies include 'spring-kafka' and 'kafka-clients'. Create a configuration class to configure the Kafka producer and consumer properties. You can use the '@Configuration' annotation to mark this class.
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12 min readTo host a Spring Boot application for free, there are a few options available. Here are some approaches you can consider:Heroku: Heroku is a popular cloud platform that offers a free tier for hosting web applications. You can create a Heroku account and deploy your Spring Boot application using their CLI tool or by connecting your application repository to Heroku. It supports various build tools like Maven or Gradle.
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8 min readTo stop a Spring Boot application from the command line, you need to perform the following steps:Identify the process ID (PID) of the running Spring Boot application. You can do this by using the jps command. Open the command prompt and type jps -l. Look for the process with the name of your Spring Boot application, typically the JAR file name. Once you have identified the PID, use the kill command with the PID to stop the Spring Boot application.
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10 min readTo send email in Spring Boot, you can follow these simple steps:Ensure that you have the necessary dependencies included in your project's pom.xml file. These dependencies usually include the 'spring-boot-starter-mail' and 'javax.activation' libraries. Configure the email settings in your application.properties or application.yml file. Include the SMTP server details such as host, port, username, and password. For example: spring.mail.host=smtp.example.com spring.mail.
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10 min readIn Spring Boot, you can set a default value for a field in an entity class by using the @Column annotation with the columnDefinition attribute.Here's an example of how you can set a default value for a field: import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; @Entity public class MyEntity { @Id @GeneratedValue(strategy = GenerationType.
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8 min readIn Spring Boot, you can execute SQL queries by leveraging the powerful Spring Data JPA framework. Here are the steps to execute SQL queries in Spring Boot:Define your database connection properties in the application.properties file, including the URL, username, and password. Create an entity class that represents your database table. Use annotations such as @Entity, @Table, and @Column to map the class attributes to the database table columns.
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9 min readIn Spring Boot, you can write native queries to directly interact with the underlying database using SQL statements. Native queries allow you to have more control and flexibility over the query execution.To write a native query in Spring Boot, you need to follow these steps:Create a repository interface that extends the JpaRepository or CrudRepository interface.Declare a method in the repository interface, and annotate it with the @Query annotation.