I have just submitted the following ticket as a Mac installer defect:
Installing Mac OS X 10.9 (Mavericks) removes JRE 6. From the terminal, "java -version" returns a pop-up with a link to the Oracle JRE/JDK 7 install page. After this is done, "java -version" confirms that JRE 1.7 is installed. Then, running the JOSM launcher demands a JRE 6 install. If instead, "java -jar josm-tested.jar" is run, JOSM works just fine, including no longer warning about an out-of-date JRE.
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