Eclipse Says No Java Found: How Do I Fix the 'No JRE/JDK Detected' Error?

Eclipse: No Java (JRE)/JDK Detected

Eclipse requires a Java Runtime Environment (JRE) or Java Development Kit (JDK) to function. However, users may encounter an error indicating that no Java virtual machine (JVM) was found during startup. This issue can arise even after installing both JDK and SDK.

Resolving this issue involves understanding the following:

• Installing a JRE/JDK merely involves extracting the files; multiple JVM versions can coexist.
• Eclipse typically launches using the default JVM defined in the PATH variable.
• The JVM used for launching Eclipse may differ from the one registered within Eclipse for project execution.

Solution:

There are three key steps to resolve the issue:

1. Locate the latest JRE: Determine the path to the most recent JRE version installed on your system.

2. Update Eclipse configuration:

   • Modify the eclipse.ini file in the Eclipse installation directory.

   • Add the following line:

     -vm
     <path-to-latest-JRE>\javaw.exe

     Copy after login

3. Register JDK in Eclipse (Optional):

   • Within Eclipse, navigate to Preferences > Java > _Installed JREs_.
   • Add the desired JDK to be used for project-related tasks.

Additional Notes:

• Ensure that the JRE/JDK paths are correct and reference the latest versions.
• For Windows 64-bit systems, verify that you have installed the 64-bit version of JRE and Eclipse.
• Editing the eclipse.ini file should be done carefully and only when necessary, as Eclipse will not utilize the PATH variable if a value is specified in this file.

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