activemq and the java.io.EOFException: Chunk stream does not exist at page: 0

If you start activemq and get an error like that

INFO | Scheduler using directory: activemq-data/localhost/scheduler
ERROR | Failed to start ActiveMQ JMS Message Broker. Reason: java.io.EOFException: Chunk stream does not exist at page: 0
java.io.EOFException: Chunk stream does not exist at page: 0

It means that there is something wrong with the scheduler.

If you don't use the built in persisten scheduler you can easily turn it off by changing the activemq.xml config file (/opt/local/share/java/activemq/conf/activemq.xml)

<broker xmlns="http://activemq.apache.org/schema/core" ....
to
<broker xmlns="http://activemq.apache.org/schema/core" schedulerSupport="false">

Open a new tab with AppleScript in Chrome

tell application "Google Chrome"
 set myTab to make new tab at end of tabs of window 1
 set URL of myTab to "http://google.com"
end tell

more AppleScript Chrome goodies at http://laclefyoshi.blogspot.com/2010/10/google-chrome-ver.html

Get user id on a remote server

you have to use SSH public/private key pairs to make this work.

#!/bin/bash
uid=`ssh <your.server> 'id -u'
echo $uid

more stuff here http://bashcurescancer.com/run_remote_commands_with_ssh.html

Google App Engine Development Console from command line

When you develop on localhost the interactive console that Google provides is not convenient.
In my project I had to run few scripts in the console quite often, so instead of going to the interactive console all the time I could do it from command line.

This example executes the 'gen_pilot_data.py' script on the interactive console.

curl --data-urlencode "code=`cat src/gen_pilot_data.py`" http://localhost:8079/_ah/admin/interactive/execute

Please notice that you may have to the change the port number.

Latitude and longitude of cities

http://www.getlatlon.com

 cities = [
  { 'name': 'Tokyo', 'lat': 35.6894875, 'lon': 139.6917064 },
  { 'name': 'Seoul', 'lat': 37.566535, 'lon': 126.9779692 },
  { 'name': 'Beijing', 'lat': 39.904214, 'lon': 116.407413 },
  { 'name': 'New Delhi', 'lat': 28.635308, 'lon': 77.22496 },
  { 'name': 'Moscow', 'lat': 55.755786, 'lon': 37.617633 },
  { 'name': 'Kiev', 'lat': 50.45, 'lon': 30.5233333 },
  { 'name': 'Budapest', 'lat': 47.4984056, 'lon': 19.0407578 },
  { 'name': 'Berlin', 'lat': 52.5234051, 'lon': 13.4113999 },

  { 'name': 'Paris', 'lat': 48.8566667, 'lon': 2.3509871 },
  { 'name': 'Madrid', 'lat': 40.4166909, 'lon': -3.7003454 },
  { 'name': 'New York', 'lat': 40.7143528, 'lon': -74.0059731 },

  { 'name': 'Mexico City', 'lat': 19.4270499, 'lon': -99.1275711 },
  { 'name': 'Honolulu', 'lat': 21.3069444, 'lon': -157.8583333 },

  { 'name': 'Sydney', 'lat': -33.8599722, 'lon': 151.2111111 },
  { 'name': 'Taipei', 'lat': 25.091075, 'lon': 121.5598345 }
 ]

Zoom to fit all markers with Google Maps V3

// creating the map
var map = new google.maps.Map(document.getElementById("map_canvas"), {
  mapTypeId: google.maps.MapTypeId.ROADMAP
});

// latitude, longitude values
var latLons = [ { lat: 35.6453962, lon: 139.7117893 }, 
                           { lat: 35.645076, lon: 139.709183 }  ];

// this is the bounding box container
var bounds = new google.maps.LatLngBounds();

// iterating through the points
latLons.forEach( function (element, index, array) {

  var point = new google.maps.LatLng(element.lat,element.lon);
  
  // extending the bounding box
  bounds.extend(point);

  // creating the marker on the map
  var marker = new google.maps.Marker({
        position: point,
        map: map
    });
});

// zooming on the map
map.fitBounds(bounds);

Reload the browser with AppleScript

This post is obsoleted, here is the new simplified version.

AppleScript is a weird language but you still can do cool things with it.

tell application "Google Chrome"
        activate
end tell

tell application "System Events"
 tell process "Google Chrome"
  keystroke "r" using {command down}
 end tell
end tell

Please feel free to replace "Google Chrome" with your choice.

https://github.com/yikulju/MacGyver/blob/master/reload-browser.applescript