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Git Hub Codespace setup

jdk version update

sdk install java 21.0.3-tem

If SDK Not available curl -s "https://get.sdkman.io" | bash source "$HOME/.sdkman/bin/sdkman-init.sh" sdk install java 21.0.3-tem

Install These Extensions Extension Pack for Java Spring Boot Extension Pack

Ctrl+Shift+P -> command Pallete Opening. search spring init...

creating maven project

1. Essential Extensions

Before you start, you need the Extension Pack for Java by Microsoft. This is a bundle that includes:

  • Language Support for Java™ (by Red Hat)
  • Debugger for Java
  • Maven for Java (This is the one that does the heavy lifting)

2. Creating the Project

  1. Open VS Code and press Ctrl + Shift + P (to open the Command Palette).
  2. Type "Java: Create Java Project" and select it.
  3. Choose "Maven" from the list of build tools.
  4. Select a "maven-archetype-quickstart".
    • Tip: This is the most basic template for a console-based Java application.
  5. Select the version (usually 1.4 or the latest available).
  6. Input Group Id: Use something professional like com.bank.
  7. Input Artifact Id: Name your project (e.g., banking-system).
  8. Choose a folder on your computer where the project will live.

3. The "Terminal" Interaction

Once you select the folder, a terminal will open at the bottom. Maven might ask you to confirm the properties:

  • It will show the groupId, artifactId, and version.
  • Press Enter to confirm or type Y if prompted.

4. Project Structure

VS Code will then generate the standard Maven structure for you:

  • src/main/java: Your source code.
  • src/test/java: Where your unit tests go.
  • pom.xml: Your configuration file where you will add your PostgreSQL and other dependencies.

Pro-Tips for your Banking Project:

  • Adding Dependencies: To add the JDBC driver for Postgres, you don't need to download a .jar manually. Just open your pom.xml, and inside the <dependencies> tag, add the Postgres dependency. VS Code will detect the change and ask to synchronize the project.
  • Running the App: You can just click the "Run" or "Debug" text that appears floating above your public static void main method.

This is a very common issue when using the default Maven template (archetype). It defaults to Java 7, but modern environments (like your workspace) require at least Java 8 or higher.

The fix is simple. You just need to tell Maven to use a newer version of Java in your pom.xml.

The Fix

  1. Open your pom.xml file.
  2. Look for the <properties> section. It usually looks like this: 
    <properties>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <maven.compiler.source>1.7</maven.compiler.source>
  <maven.compiler.target>1.7</maven.compiler.target>
</properties>
  3. Change the 1.7 to 1.8 (or 11 or 17 if you prefer, but 1.8 is the standard for most learning projects).

Update it to look like this:

<properties>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <maven.compiler.source>1.8</maven.compiler.source>
  <maven.compiler.target>1.8</maven.compiler.target>
</properties>

What to do next:

  1. Save the pom.xml.
  2. Run the command again: 
    mvn clean install

Since you are using VS Code, it usually detects changes in the pom.xml and asks to synchronize. However, it is a great habit to run a manual build to ensure the dependency is actually downloaded and recognized by your local repository.

1. Build and Download

In your VS Code terminal, run:

mvn clean install
  • clean: Removes the target folder (old compiled files).
  • install: Downloads the PostgreSQL driver from the internet and puts it in your local .m2 folder.

If you see BUILD SUCCESS, your Java code is now officially "aware" of the PostgreSQL classes.