Quick Note

1.   p7zip is the Unix port for 7-zip. So use "sudo port install p7zip" to install

Configure Datanucleus Plugin

1. The MANIFEST.MF must have correct content in MANIFEST.MF tag

3. persistence.xml must have all persistencable classes' correct full class names.

2. For datanucleus enhancer running every time you build, right click on project name, go to properties, Maven-> Lifecycle Mapping, change the two lifecycle to process-test-classes

ZooKeeper-Coprocessor-QuickNote

1. In Coprocessor-start, a call on env.getTable will lead to connection refused error.
To solve this, using HTable constructor HTable(configuration, tableName) instead, configuration is necessary since zookeeper port number is not consistant always.
Remember to call htable.close() after operation to salve resource.

2. look for the thread using port 60010
lsof | grep 60010
Then kill the thread

mvn quick review

1. Get dependency source: mvn dependency:sources

2. Sometime, better remove the whole thing and install for multiple version updating 

rm -Rf ~/.m2/repository/

In Eclipse, maven build... + insall + skip tests

3. An workaround for "Internal error when enable maven dependence management", check in with svn, them import --> import existing maven project, select local projects as a whole.


4. Switch maven version :
$ cd /usr/share/java
$ ls -q1 | grep maven #check if your desired maven version is there
apache-maven-2.0.9
maven-2.2.0
maven-2.2.1
maven-3.0.2
$ cd .. #go up
$ ls -l | grep maven #check what current version is
maven -> java/maven-3.0.2$ sudo rm maven #remove unwanted symlink
Password:
$ sudo ln -s java/maven-2.2.1 maven #set it to maven 2.2.1

5. mvn update version

mvn versions:set -DnewVersion=2.50.1-SNAPSHOT

It will adjust all pom versions, parent versions and dependency versions in a multi-module project.

update child module version

mvn versions:update-child-modules

If you made a mistake, do

mvn versions:revert

afterwards, or

mvn versions:commit

OpenSuse install Chrome

1. Download Chrome frome google.com
2. At terminal: sudo zypper in ~/Downloads/[package name]

Kubuntu Missing Virtical Scoll Bar

sudo modprobe -r psmouse
sudo modprobe psmouse proto=imps

This enables scrolling for your current session - test and make sure it works. If so, you can make it permanent by:

sudo gedit /etc/modprobe.d/options

and adding the line:

options psmouse proto=imps

Then close and reboot.

OSX and Mac Quick Note

Add environment variable: apply commands in bash style in ~/.profile,
ex.
ACE_ROOT=~/Documents/ACE_wrappers; export ACE_ROOT
LD_LIBRARY_PATH=$ACE_ROOT/lib; export LD_LIBRARY_PATH




Install wget in OSX


curl -O http://ftp.gnu.org/gnu/wget/wget-1.13.4.tar.gz tar -xzvf wget-1.13.4.tar.gz cd wget-1.13.4 ./configure --with-ssl=openssl make sudo make install which wget #Should output: /usr/local/bin/wget