3.0 Not responding (MAC)

[anchardo]

Describe the bug
I have the same bug as described by @whanley in #1671 so I'll just copy paste the first paragraphs:

To Reproduce
Steps to reproduce the behavior:

1. Open v 3.0 from https://github.com/OpenRefine/OpenRefine/releases/download/3.0/openrefine-mac-3.0.dmg
2. Drag to applications
3. Open the program
4. See error

Current Results
Icon bounces in tray for some seconds, then stops bouncing. No error message, except in browser.

Expected behavior
The program should open.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Desktop :
OS: OS X El Capitan
Browser: Chrome
Version: 70.0

OpenRefine :
OpenRefine 3.0

After reading related issues, I have clicked on 'replace' (the version 2.8) during the installation process, deleted the former rdf-extension, modified the extension folder as suggested by @janruehling, nothing changed.

If I run Openrefine by launching a command in the Terminal, here is what I got in the console (I don't know which specific part is relevant...):

Raphaels-MBP:MacOS researcher$ ./JavaAppLauncher
21:32:58.454 [            refine_server] Starting Server bound to '127.0.0.1:3333' (0ms)
21:32:58.466 [            refine_server] Initializing context: '/' from '/Applications/OpenRefine.app/Contents/Resource/webapp' (12ms)
21:32:58.922 [                   refine] Starting OpenRefine 3.0 [TRUNK]... (456ms)
21:32:58.922 [                   refine] initializing FileProjectManager with dir (0ms)
21:32:58.922 [                   refine] /Users/researcher/Library/Application Support/OpenRefine (0ms)
Exception in thread "main" java.lang.NoClassDefFoundError: com/google/refine/ProjectMetadata
	at java.lang.Class.getDeclaredMethods0(Native Method)
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
	at java.lang.Class.privateGetPublicMethods(Class.java:2902)
	at java.lang.Class.getMethods(Class.java:1615)
	at org.mozilla.javascript.JavaMembers.discoverAccessibleMethods(JavaMembers.java:380)
	at org.mozilla.javascript.JavaMembers.discoverAccessibleMethods(JavaMembers.java:335)
	at org.mozilla.javascript.JavaMembers.reflect(JavaMembers.java:450)
	at org.mozilla.javascript.JavaMembers.<init>(JavaMembers.java:76)
	at org.mozilla.javascript.JavaMembers.lookupClass(JavaMembers.java:838)
	at org.mozilla.javascript.NativeJavaClass.initMembers(NativeJavaClass.java:84)
	at org.mozilla.javascript.NativeJavaClass.<init>(NativeJavaClass.java:78)
	at org.mozilla.javascript.NativeJavaPackage.getPkgProperty(NativeJavaPackage.java:164)
	at org.mozilla.javascript.NativeJavaPackage.get(NativeJavaPackage.java:114)
	at org.mozilla.javascript.ScriptableObject.getProperty(ScriptableObject.java:1617)
	at org.mozilla.javascript.ScriptRuntime.getObjectProp(ScriptRuntime.java:1437)
	at org.mozilla.javascript.ScriptRuntime.getObjectProp(ScriptRuntime.java:1423)
	at org.mozilla.javascript.gen.c8._c1(file:/Users/researcher/Library/Application%20Support/OpenRefine/extensions/pc-axis/module/MOD-INF/controller.js:39)
	at org.mozilla.javascript.gen.c8.call(file:/Users/researcher/Library/Application%20Support/OpenRefine/extensions/pc-axis/module/MOD-INF/controller.js)
	at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:398)
	at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3065)
	at org.mozilla.javascript.gen.c8.call(file:/Users/researcher/Library/Application%20Support/OpenRefine/extensions/pc-axis/module/MOD-INF/controller.js)
	at edu.mit.simile.butterfly.ButterflyModuleImpl.scriptInit(ButterflyModuleImpl.java:636)
	at edu.mit.simile.butterfly.ButterflyModuleImpl.init(ButterflyModuleImpl.java:94)
	at edu.mit.simile.butterfly.Butterfly.initializeModule(Butterfly.java:476)
	at edu.mit.simile.butterfly.Butterfly.configure(Butterfly.java:451)
	at edu.mit.simile.butterfly.Butterfly.init(Butterfly.java:308)
	at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:440)
	at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:263)
	at com.google.refine.RefineServer.configure(Refine.java:296)
	at com.google.refine.RefineServer.init(Refine.java:208)
	at com.google.refine.Refine.init(Refine.java:114)
	at com.google.refine.Refine.main(Refine.java:108)
Caused by: java.lang.ClassNotFoundException: com.google.refine.ProjectMetadata
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at edu.mit.simile.butterfly.ButterflyClassLoader.loadClass(ButterflyClassLoader.java:65)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 32 more

[ettorerizza]

Any idea what the problem is, everyone?

[wetneb]

That seems to be caused by an extension that was compiled for a previous version - the com.google.refine.ProjectMetadata class has been renamed to com.google.refine.model.metadata.ProjectMetadata in the data package PR.

[anchardo]

Thank you for your help @ettorerizza and @wetneb. I have completely removed my extension folder (I'll reinstall only the last version of the ones I actually use) and the 3rd version is finally working on my computer, thank you very much!