No available plugins - Jenkins

Question

I have installed a fresh jenkins on my amazon ec2 micro instance but when I access the plugin manager, I don't have any plugin available. What's wrong?

I used this guide to install https://wiki.jenkins-ci.org/display/JENKINS/Installing+Jenkins+on+Ubuntu

I'm running ubuntu 11.04 64 bits and jenkins-war:1.450

Looking my log file I see

"windmill": {"buildDate": "Feb 06, 2010", "dependencies": [], "developers": [{"developerId": "admc", "name": "Adam Christian"}], "excerpt": "This plugin allows you to configure and run <a href='http://www.getwindmill.com/'>Windmill</a> functional tests.", "labels": ["external"], "name": "windmill", "previousTimestamp": "2009-06-25T20:40:46.00Z", "previousVersion": "1.4", "releaseTimestamp": "2010-02-06T13:59:22.00Z", "requiredCore": "1.319", "scm": "svn.dev.java.net", "sha1": "npNnBKCCpnFCi+Tsw/QA1mQyyyI=", "title": "Windmill Plugin", "url": "http://updates.jenkins-ci.org/download/plugins/windmill/1.5/windmill.hpi", "version": "1.5", "wiki": "https://wiki.jenkins-ci.org/display/JENKINS/Windmill+Plugin"}, "ws-cleanup": {"buildDate": "Dec 07, 2011", "dependencies": [], "developers": [{"developerId": "
    at net.sf.json.util.JSONTokener.syntaxError(JSONTokener.java:512)
    at net.sf.json.util.JSONTokener.nextString(JSONTokener.java:244)
    at net.sf.json.util.JSONTokener.nextValue(JSONTokener.java:352)
    at net.sf.json.JSONObject._fromJSONTokener(JSONObject.java:875)
    at net.sf.json.JSONObject.fromObject(JSONObject.java:170)
    at net.sf.json.util.JSONTokener.nextValue(JSONTokener.java:355)
    at net.sf.json.JSONArray._fromJSONTokener(JSONArray.java:917)
    at net.sf.json.JSONArray.fromObject(JSONArray.java:139)
    at net.sf.json.util.JSONTokener.nextValue(JSONTokener.java:358)
    at net.sf.json.JSONObject._fromJSONTokener(JSONObject.java:875)
    at net.sf.json.JSONObject.fromObject(JSONObject.java:170)
    at net.sf.json.util.JSONTokener.nextValue(JSONTokener.java:355)
    at net.sf.json.JSONObject._fromJSONTokener(JSONObject.java:875)
    at net.sf.json.JSONObject.fromObject(JSONObject.java:170)
    at net.sf.json.util.JSONTokener.nextValue(JSONTokener.java:355)
    at net.sf.json.JSONObject._fromJSONTokener(JSONObject.java:875)
    at net.sf.json.JSONObject._fromString(JSONObject.java:1064)
    at net.sf.json.JSONObject.fromObject(JSONObject.java:176)
    at net.sf.json.JSONObject.fromObject(JSONObject.java:147)
    at hudson.model.UpdateSite.doPostBack(UpdateSite.java:150)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:282)
    at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:149)
    at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:88)
    at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:111)
    at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
    at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:563)
    ... 34 more
Jan 31, 2012 12:13:52 PM hudson.model.UpdateSite doPostBack
INFO: Obtained the latest update center data file for UpdateSource default

Answer 1

It looks like perhaps the Update Center JSON file which describes the available plugins was temporarily corrupt, or didn't get downloaded correctly.

I just tried downloading and parsing this file just now and it looks ok, so I would try triggering an update check manually.

Go to: Manage Jenkins → Manage Plugins → Advanced, then click Check now in the bottom right-hand corner.

Answer 2

The entry http://updates.jenkins-ci.org/update-center.json in the Manage-Plugins->Advanced->Update Site is missing on some Linux - Flavours and if so, obviously you won't see any available plugins.