On Thu, May 8, 2025 at 08:15 PM, Tracy Reynolds wrote:
Why two?? In some places 11 is recommended (the popup window when DecoderPro won't open) and the JMRI website says to use Java 17.? I uninstalled both.? They were JRE versions (Java Runtime Environment).? JDK is Java Development Kit.? I thought all I needed was a runtime environment since I'm not developing a Java program.? Once I installed a JDK version of Java 11 everything works.
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Tracy
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All you need is the JRE.? I've never installed a JDK in my 22+ years of using JMRI. But the JDK is fine, you just have extra "stuff" that JMRI doesn't need.
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If it didn't work (as evidenced by your "No Java runtime present, requesting install."), then you didn't have it installed properly.
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As for the Java 11 vs Java 17 confusion, 11 is the minimum required for JMRI 5.0 or later, and Java 17 is recommended for JMRI 5.9.1 and newer.
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It's all spelled out , including where to get the recommended downloads.
