Can IntelliJ Run Java Programs Using Its Embedded JDK or JRE?

IntelliJ IDEA, like many Integrated Development Environments (IDEs), has the capability to run Java programs using its embedded Java Development Kit (JDK) or Java Runtime Environment (JRE). This feature allows developers to compile and run Java applications without the need for a separate Java installation on the system. However, it's important to understand the distinction between the embedded JRE and JDK, as well as the flexibility to use an external JDK if necessary.

IntelliJ IDEA and Embedded JDK/JRE

When you create a new project or open an existing one in IntelliJ IDEA, it can utilize its embedded JDK for compiling and running Java applications. This embedded environment provides a pre-configured development environment that includes all necessary tools and libraries required for Java development. However, this inherently means that the JDK is used, not the JRE which is primarily for runtime purposes. The majority of JetBrains IDEs, including IntelliJ IDEA, come with a JRE embedded for runtime purposes, but not for development tasks like compilation.

Flexibility in Java Environment Configuration

While IntelliJ IDEA can run Java programs using its embedded JRE, developers may have specific requirements, such as using a different version of the JDK or an external JDK from another vendor. This flexibility is crucial for developers who need to:

Test compatibility: With different versions of the JDK to ensure that the application runs smoothly and resolves any version-specific issues. Select JDK versions: Based on the latest security patches and updates, which may not be included in the embedded JRE. Vendor independence: To avoid dependencies on proprietary JDK libraries or tools.

To configure a different JDK for your project in IntelliJ IDEA, follow these steps:

Navigate to File Project Structure. Select Project from the left-hand panel. Under the Project SDK section, click on ... to choose a different JDK. Select the desired JDK installation. Click OK to apply the changes.

Security and Regular Updates

The purpose of embedding a JRE in IntelliJ IDEA or any commercial Java application is that the application was developed and tested for that specific JRE. Additionally, the Java Virtual Machine (JVM) regularly receives updates, particularly for security patches. Regular updates are crucial for ensuring the application remains secure and bug-free.

Developers are recommended to update the JRE regularly to maintain the security and performance of their applications. This is especially important when dealing with sensitive data or critical systems where downtime or security vulnerabilities can have significant consequences.

Summary

In summary, while IntelliJ IDEA can run Java programs using its embedded JRE, developers have the flexibility to use an external JDK if they have specific needs. The embedded JRE is sufficient for running Java applications, but developers should always ensure they have the latest security patches and updates from the official JDK provider.