Update Developing Plugins instructions

[naoliv]

It seems that wiki:DevelopersGuide/DevelopingPlugins needs some updates.

One thing is that core seems to have vanished from the paths (ie, instead cd josm/core now it's simply cd josm)

While trying to build the reverter plugin, for example:

$ ant
Buildfile: /arquivos/tmp/josm/plugins/reverter/build.xml

init:

pre-compile:

compile:
     [echo] compiling sources for /arquivos/tmp/josm/dist/reverter.jar ...

BUILD FAILED
/arquivos/tmp/josm/plugins/build-common.xml:79: Class not found: com.google.errorprone.ErrorProneAntCompilerAdapter

Total time: 0 seconds

Maybe some other instruction needs to be updated too?

[GerdP]

Maybe /josm isn't up to date? I don't see this problem here. Try

cd /arquivos/tmp/josm
svn up

[naoliv]

It seems that I need to pay more attention when doing things...
I was using the git mirror instead (and that is why I was not seeing core, for example, and failing at locating error-prone)
Thanks, Gerd!

[Don-vip]

The git mirror is unofficial. Always use SVN to have support from us ;)

[anonymous]

Cloning from ​https://github.com/openstreetmap/josm and ​https://github.com/openstreetmap/josm-plugins also brings same error!
Aren't Gits updated?