[mkgmap-dev] osm combiner error

Tue Mar 22 16:14:45 GMT 2016

> What does Unsupported major.minor version 51.0 mean?

This happens when you try to run with Java 6 or lower. I realise that he says he on the latest version of Java and the previous version of osm combiner was running OK, so there may be more to it. The last version of mkgmap that worked with Java 6 was a long time ago.

.. Steve

On 22 March 2016 15:37:28 GMT+00:00, Minko <ligfietser at online.nl> wrote:
>Hi,
>On the osm forum someone reported this error with OSM combiner
>(http://www.openfietsmap.nl/news/osmcombiner) (mkgmap r.3654)
>http://forum.openstreetmap.org/viewtopic.php?id=30632
>
>What does Unsupported major.minor version 51.0 mean?
>
>------------------
>
>Unfortunately the new OSM Combiner 1.8 did not solve the problem for
>me.
>I dowloaded a fresh set of osm_generic_tiles.zip files for the
>Netherlands, Belgium and France and tried to combine them with OSM
>combiner 1.8 but consistently get an error message (see below). All
>steps up to "Start" work, the final step fails and gives the error
>message.
>I use MacOS 10.11.3 with the latest Java installed and allocated 5gb of
>memory to Java, disk space is plenty.
>
>What am I doing wrong?
>
>Thank you!
>
>--- Error message:
>
>Exception in thread "main" java.lang.UnsupportedClassVersionError:
>uk/me/parabola/mkgmap/main/Main : Unsupported major.minor version 51.0
>    at java.lang.ClassLoader.defineClass1(Native Method)
>    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637)
>    at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
>at
>java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
>    at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
>    at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
>    at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
>    at java.security.AccessController.doPrivileged(Native Method)
>    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
>    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
>    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
>    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
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