Gradle Add Mysql-connector-java
Toni Jarels
Features allow a component to expose multiple related libraries, each of which can declare its own dependencies.These libraries are exposed as variants, similar to how the main library exposes variants for its API and runtime.
A typical component will only provide variants with the default capability.A Java library, for example, exposes two variants (API and runtime) which provide the same capability.As a consequence, it is an error to have both the API and runtime of a single component in a dependency graph.
However, imagine that you need the runtime and the test fixtures runtime of a component.Then it is allowed as long as the runtime and test fixtures runtime variant of the library declare different capabilities.
A feature should have a source set with the same name.Gradle will create a Jar task to bundle the classes built from the feature source set, using a classifier corresponding to the kebab-case name of the feature.
By convention, Gradle maps the feature name to a capability whose group and version are the same as the group and version of the main component, respectively, but whose name is the main component name followed by a - followed by the kebab-cased feature name.
This will automatically bring the mysql-connector-java dependency on the runtime classpath.If there were more than one dependency, all of them would be brought, meaning that a feature can be used to group dependencies which contribute to a feature together.
Using the Liquibase Gradle plugin helps to manage database scripts, build and automate your software processes. When Gradle applies the plugin to the target, it creates a Gradle task for each command supported by Liquibase. To see the list of those tasks, run the gradle tasks command.
Add the dependencies section to include files on which Liquibase will depend to run commands. The plugin needs to find Liquibase when it runs a task, and Liquibase needs to find database drivers, changelog parsers, and other files on the classpath. When adding liquibaseRuntime dependencies to the dependencies section in the build.gradle file, include the Liquibase value along with your database driver:
If you use Groovy scripts for database changes, the example code includes the Liquibase Groovy DSL dependency, which parses changelogs written in a Groovy DSL. You do not need to add org.liquibase:liquibase-groovy-dsl:2.1.1 if you do not use the Groovy changelog format. For more information, see Step 4.
Create a text file in your application directory and name it changelog.sql. Liquibase also supports the XML, YAML, and JSON changelog formats. Another way to use Liquibase and Gradle is with the changelog.groovy file.
To store other Liquibase parameters in a file instead of passing them at runtime, you can either specify the properties in the build.gradle file or create a new text file called liquibase.properties and set them there.
This guide walks you through the process of creating a Spring application connected to a MySQL Database (as opposed to an in-memory, embedded database, which most of the other guides and many sample applications use). It uses Spring Data JPA to access the database, but this is only one of many possible choices (for example, you could use plain Spring JDBC).
Before you can build your application, you first need to configure a MySQL database. This guide assumes that you use Spring Boot Docker Compose support. A prerequisite of this approach is that your development machine has a Docker environment, such as Docker Desktop, available. Add a dependency spring-boot-docker-compose that does the following:
To use Docker Compose support, you need only follow this guide. Based on the dependencies you pull in, Spring Boot finds the correct compose.yml file and start your Docker container when you run your application.
Spring Initializr creates a simple class for the application. The following listing shows the class that Initializr created for this example (in src/main/java/com/example/accessingdatamysql/AccessingDataMysqlApplication.java):
@ComponentScan: Tells Spring to look for other components, configurations, and services. If specific packages are not defined, recursive scanning begins with the package of the class that declares the annotation.
At this point, you can now run the application to see your code in action. You can run the main method through your IDE or from the command line. Note that, if you have cloned the project from the solution repository, your IDE may look in the wrong place for the compose.yaml file. You can configure your IDE to look in the correct place or you could use the command line to run the application. The ./gradlew bootRun and ./mvnw spring-boot:run commands launch the application and automatically find the compose.yaml file.
To package and run the application, we need to provide an external MySQL database rather than using Spring Boot Docker Compose Support. For this task, we can reuse the provided compose.yaml file with a few modifications: First, modify the ports entry in compose.yaml to be 3306:3306. Second, add a container_name of guide-mysql.
Third, we need to tell our application how to connect to the database. This step was previously handled automatically with Spring Boot Docker Compose support. To do so, modify the application.properties file so that it is now:
To run the application, you can package the application as an executable jar. The ./gradlew clean build command compiles the application to an executable jar. You can then run the jar with the java -jar build/libs/accessing-data-mysql-0.0.1-SNAPSHOT.jar command.
Alternatively, if you have a Docker environment available, you could create a Docker image directly from your Maven or Gradle plugin, using buildpacks. With Cloud Native Buildpacks, you can create Docker compatible images that you can run anywhere. Spring Boot includes buildpack support directly for both Maven and Gradle. This means you can type a single command and quickly get a sensible image into a locally running Docker daemon. To create a Docker image using Cloud Native Buildpacks, run the ./gradlew bootBuildImage command. With a Docker environment enabled, you can run the application with the docker run --network container:guide-mysql docker.io/library/accessing-data-mysql:0.0.1-SNAPSHOT command.
Spring Boot also supports compilation to a native image, provided you have a GraalVM distribution on your machine. To create a native image with Gradle using Native Build Tools, first make sure that your Gradle build contains a plugins block that includes org.graalvm.buildtools.native.
You can then run the ./gradlew nativeCompile command to generate a native image. When the build completes, you will be able to run the code with a near-instantaneous start up time by executing the build/native/nativeCompile/accessing-data-mysql command.
You can also create a Native Image using Buildpacks. You can generate a native image by running the ./gradlew bootBuildImage command. Once the build completes, you can start your application with the docker run --network container:guide-mysql docker.io/library/accessing-data-mysql:0.0.1-SNAPSHOT command.
If you ran the application using a Docker instruction above, a simple curl command from a terminal or command line will no longer work. This is because we are running our containers in a Docker network that is not accessible from the terminal or command line. To run curl commands, we can start a third container to run our curl commands and attach it to the same network.
When you are on a production environment, you may be exposed to SQL injection attacks. A hacker may inject DROP TABLE or any other destructive SQL commands. So, as a security practice, you should make some changes to your database before you expose the application to your users.
I tried finding a tutorial for how to set up Gradle in GitLab but to no avail. Would someone please be so kind and give me a step-by-step tutorial for how to set up an automatic test routine with Gradle, or maybe know of some resources that could be helpful? That would be very much appreciated! I guess I have to put a build.gradle file somewhere? I will study these things more thoroughly when I have time, but right now I just need to get it up and running before our sprint starts
Sure, first I created a Gradle project in Eclipse using the Buildship plugin. Then I pushed all of that to the repo. I tried different YAML-files that I found on the internet but only this one worked:
Gradle is an open-source build automation system that builds upon the concepts of Apache Ant and Apache Maven, and introduces a Groovy-based, domain-specific language (DSL), instead of the XML form used by Apache Maven to declare the project configuration. This post will cover how easy it is to use this tool, and how to migrate your Maven project to Gradle to run it on Platform.sh.
In the Maven project, we have the pom.xml file, where we define the library dependencies, plug-ins, and so on. In a Gradle project, we have the build.gradle file. The build file for Gradle is based on DSL. In this file, you can use a combination of declarative and imperative statements. And you can write Groovy or Kotlin code, whenever you need to. Tasks can also be created and extended dynamically at runtime.
You can download and install Gradle locally, or by using the Gradle Wrapper. The recommended way to execute any Gradle build is with the help of the Gradle Wrapper. The Wrapper is a script that invokes a declared version of Gradle, downloading it beforehand, if necessary. As a result, you can get up and running with a Gradle project quickly without having to follow manual installation processes, saving your company time and money.
Only the developer who creates the Gradle Wrapper must have Gradle installed locally. Once the Gradle is ready, no one on the team, even the developer who creates the Wrapper, requires the native Gradle:
Well done! Now we have a project migrated and ready to use in Gradle. As a matter of fact, Platform.sh has a template that runs both Gradle and Spring Boot to help you create and run a Gradle project faster.
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