Voices that matter

in technology, of course!!!

Here is the great video from Josh Bloch on GWT.

Extremely useful blog entries that I used in recent days

Subversion, subclipse, JavaHL - http://blog.lv25.com/2009/04/build-subversion-16-on-ubuntu-810.html

Eclipse on Snow Leopard - http://ekkescorner.wordpress.com/2009/06/30/galileo-epp-for-cocoa-64-bit/

pic2shop

My brother just found a great application, something extremely useful to shoppers, actually cautious shoppers who want to make sure that they get the best price. The application is called as 'pic2shop'. You can just scan bar code using iPhone and then it tells you the price on best of the websites. You can go to amazon, bestbuy, buy.com from here to get more information.

Just cool :)

GWT on Snow Leopard

I was trying to run gwt module on Mac Snow Leopard. Snow Leopard does not come with java 1.5, so when I tried running gwt module after upgrading from Leopard, it did not work.

I tried following and it worked. Here is the page.

Henplus installation on Jaunty Jackalope

Henplus is one of the great tools where one can perform database operations. It is a great tool for developers who are working remotely on Linux or Mac machines. I had Henplus installed on Gutsy Gibbon for a long time and I successfully used it to code my jdbc calls and test it while being at home all through ssh tunneling.

Now it was time to move to Jaunty Jackalope but somehow the move was not so easy when it came to henplus. I tried installing henplus using just

sudo apt-get install henplus

This installation has a problem that it does not let you pass

userName@machineName:~$henplus

using GNU readline (Brian Fox, Chet Ramey), Java wrapper by Bernhard Bablok
henplus config at /home/oliver/.henplus


---------------------------------------------------------------------------


HenPlus II 0.9.7-1 Debian
 Copyright(C) 1997..2006 Henner Zeller 
 HenPlus is provided AS IS and comes with ABSOLUTELY NO WARRANTY
 This is free software, and you are welcome to redistribute it under the
 conditions of the GNU Public License


---------------------------------------------------------------------------


usage: henplus


-h,--help print this message


-J,--url JDBC URL to connect to

-P,--password Password to connect with


-U,--username Username to connect with

---

The problem is discussed here. The problem is still not fixed in Jaunty, so I decided to directly download it from henplus site.

1. Here is the link to download henplus.
2. You will also need libreadline-java, download it from following libreadline.
3. You will need to make for libreadline-java as followed userName@machineName:/opt/installs/libreadline-java-0.8.0$ make
4. You will see that there is new jar that is created libreadline-java.jar . Copy this jar to /usr/lib userName@machineName:/opt/installs/libreadline-java-0.8.0$ cp libreadline-java.jar /usr/lib/.
5. Now you will need to update the script of henplus as followed (at the end of this article) userName@machineName:/opt/installs/henplus/bin$sudo gedit henplus
6. Now final step you will need to compile the java files to classes. userName@machineName:/opt/installs/henplus$ ant -buildfile build.xml
7. You of course need to have JAVA_HOME set on your machine. Of course whatever jdbc driver that you are using, you will need to have that in CLASSPATH defined in your /etc/bash.bashrc.
8. You should be able to use henplus userName@machineName:/opt/installs/henplus/bin$ henplus ./.../../build/classes::/opt/installs/jdk1.6:/opt/installs/ant/bin:/opt/installs/ojdbc14.jar:/opt/installs/jmeter/bin:/opt/installs/jdk1.6/lib:./../lib/commons-cli-1.2.jar:./../lib/libreadline-java-0.8.0.jar ./../build/classes::/opt/installs/jdk1.6:/opt/installs/ant/bin:/opt/installs/ojdbc14.jar:/opt/installs/jmeter/bin:/opt/installs/jdk1.6/lib:./../lib/commons-cli-1.2.jar:./../lib/libreadline-java-0.8.0.jar:/usr/lib/libreadline-java.jar

using GNU readline (Brian Fox, Chet Ramey), Java wrapper by Bernhard Bablok

henplus config at /home/shilpa/.henplus

----------------------------------------------------------------------------

HenPlus II 0.9.8 "Yay Labor Day"

Copyright(C) 1997..2009 Henner Zeller

HenPlus is provided AS IS and comes with ABSOLUTELY NO WARRANTY

This is free software, and you are welcome to redistribute it under the

conditions of the GNU Public License

----------------------------------------------------------------------------

Hen*Plus>

Here is the updated henplus script

#!/bin/sh

# $Id: henplus,v 1.13 2006-03-19 22:41:56 hzeller Exp $

### additional flags you might want to pass to the java interpreter

# like -Dfile.encoding=ISO-8859-1

JAVA_FLAGS=

if [ -z "$JAVA_HOME" ] ; then

# try to use java in path

JAVA=java

else

JAVA=$JAVA_HOME/bin/java

fi

##------------------

THISDIR=`dirname $0`

# install layout is: script in /usr/bin/henplus and libs in /usr/share/henplus

HENPLUSDIR=$THISDIR/.. #WE HAVE UPDATED THIS

echo $HENPLUSDIR

# not yet installed ? Then look in the local build directory, we need to make sure that build/classes are added to the classpath.

#WE HAVE UPDATED FOLLOWING SECTION

if [ ! -d "$HENPLUSDIR" ] ; then

HENPLUSDIR=$THISDIR/..

fi

for f in $HENPLUSDIR/lib/*.jar ; do

CLASSPATH=$CLASSPATH:$f

done

CLASSPATH=$HENPLUSDIR/build/classes:$CLASSPATH

echo $CLASSPATH

# location of the readline lib.

# Modify this, if you installation stores this at a different

# position.

LD_LIBRARY_PATH=$THISDIR/../lib:/usr/lib/jni:$LD_LIBRARY_PATH

CLASSPATH=$CLASSPATH:/usr/lib/libreadline-java.jar #WE HAVE UPDATED THIS

# you may just throw your own jar files in this dir.

# (like additional JDBC-drivers, that are not in default

# classpath)

for f in $HENPLUSDIR/*.jar $HENPLUSDIR/*.zip ; do

if [ -r "$f" ] ; then

CLASSPATH=$CLASSPATH:$f

fi

done

echo $CLASSPATH

# starting at the current directory we look for additional

# JDBC-drivers in .henplus/lib-directories up the path.

# if no directory like that has been found the one in the

# home directory will be used

DIR=`pwd`

CUSTOM_HENPLUSDIR=""

while [ $DIR != "/" ] ; do

if [ -d $DIR"/.henplus/lib" ]; then

CUSTOM_HENPLUSDIR=$DIR"/.henplus/lib"

break

fi

DIR=`dirname $DIR`

done

if [ -z $CUSTOM_HENPLUSDIR ]; then

if [ -d "/.henplus/lib" ]; then

CUSTOM_HENPLUSDIR="/.henplus/lib"

else

CUSTOM_HENPLUSDIR=$HOME/.henplus/lib

fi

fi

for f in $CUSTOM_HENPLUSDIR/*.jar $CUSTOM_HENPLUSDIR/*.zip ; do

if [ -r "$f" ] ; then

CLASSPATH=$CLASSPATH:$f

fi

done

export CLASSPATH LD_LIBRARY_PATH

exec $JAVA $JAVA_FLAGS henplus.HenPlus "$@"

Some links of great presentations

Finally after a long postponement, I saw the presentation How to design an API by Joshua Bloch. I want to share a link where you can see the video and presentation. Just click here. Also while googling him, I found that he is one of the top 40 software people in the world. If you are interested, here is the list. 

InfoQ is a great site with exceptional presentation. One of the latest addition is Neal Gafter's presentation. I hope to see that soon.