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
Tracy Reynolds