How Do I Fix the Eclipse 'No Java (JRE) / (JDK) ... No Virtual Machine' Error?

Eclipse "No Java (JRE) / (JDK) ... No Virtual Machine" Error

This issue arises when Eclipse attempts to launch without a Java Runtime Environment (JRE) or Java Development Kit (JDK). Specifically, Eclipse searches several locations for a Java virtual machine but fails to find one.

To resolve this issue, it is essential to understand that:

1. JRE/JDK Installation

Installing a JRE or JDK involves simply unzipping or copying it to a desired location. Multiple JVM versions can coexist on a system, installed anywhere.

2. Eclipse Launch JRE/JDK

By default, Eclipse attempts to launch using the "java.exe" specified in your PATH. However, it is recommended to configure Eclipse to use the latest JRE available. This can be done by:

• Referencing the exact JRE path in your "eclipse.ini" file.
• Copying the JRE to your "/jre" directory.

3. Eclipse Registered JDK

Within Eclipse, you should register a JDK for your projects. This JDK is used for Java source and debugging purposes, as well as compilation in some cases. Although the JDK registered in Eclipse is typically also used for launching Eclipse, this is not always the case. You may want to register an older SDK to run/debug your programs with a JRE similar to the one that will be used in production.

Windows-Specific Considerations

For Windows 7 64-bit users, ensure that you have the 64-bit JRE installed as Eclipse 64-bit requires it. Direct access to the manual install page can be difficult, so refer to "Java Downloads for All Operating Systems" to download the appropriate JRE.

eclipse.ini File Editing

In some cases, it may be necessary to edit your "eclipse.ini" file to specify the correct Java path. Eclipse ignores the PATH environment variable if a value is present in "eclipse.ini."

By following these guidelines, you should be able to resolve the "No Java (JRE) / (JDK) ... No Virtual Machine" error in Eclipse.

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