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

Eclipse Shortcuts

My Useful Shortcut

goto line start                         Command + left arrow

goto line end

select to line end                    Command +shift + right arrow

goto line                                 Command + L


delete a line                            Command + D

Edit

Content Assist                          Alt+/         In Dialogs and Windows

Context Information                   Alt+?                        In Windows

Context Information                   Shift+Alt+? In Windows

Context Information                   Shift+Ctrl+Space        In Windows

Copy                                        Alt+W       In Dialogs and Windows

Copy                                        Ctrl+C       In Dialogs and Windows

Copy                                        Ctrl+Insert In Dialogs and Windows

Copy                                        Esc W      In Dialogs and Windows

Cut                                          Ctrl+W      In Dialogs and Windows

Cut                                          Ctrl+X       In Dialogs and Windows

Cut                                          Shift+Del   In Dialogs and Windows

Delete                                      Delete                      In Windows

Find Previous                            Shift+Ctrl+K               Editing Text

Find and Replace                       Alt+R                        In Windows

Find and Replace                       Esc R                       In Windows

Incremental Find                        Ctrl+J                       Editing Text

Incremental Find                        Ctrl+S                       Editing Text

Incremental Find Reverse           Ctrl+R                      Editing Text

Incremental Find Reverse           Shift+Ctrl+J               Editing Text

Paste                                       Ctrl+Y       In Dialogs and Windows

Paste                                       Shift+Ins   In Dialogs and Windows

Quick Diff Toggle                       Shift+Ctrl+Q              Editing Text

Quick Fix                                  Ctrl+1                       In Windows

Redo                                        Ctrl+X R                   In Windows

Redo                                        F10                          In Windows

Redo                                        Shift+Ctrl++               In Windows

Restore Last Selection               Shift+Alt+Down          Editing Java Source

Select All                                  Ctrl+X H    In Dialogs and Windows

Select Enclosing Element            Shift+Alt+Up              Editing Java Source

Select Next Element                   Shift+Alt+Right           Editing Java Source

Select Previous Element             Shift+Alt+Left             Editing Java Source

Show Tooltip Description             F2                            Editing Java Source

Toggle Insert Mode                    Shift+Ctrl+Insert         Editing Text

Undo                                        Ctrl+X U                   In Windows

Undo                                        F9                            In Windows

Undo                                        Shift+Ctrl+-                In Windows

File

Close                                       Ctrl+F4                     In Windows

Close                                       Ctrl+X K                    In Windows

Close All                                   Ctrl+X Ctrl+C             In Windows

Close All                                   Shift+Ctrl+F4             In Windows

Close All                                   Shift+Ctrl+W              In Windows

New menu                                Shift+Alt+N                In Windows

Print                                         Alt+F9                      In Windows

Print                                         Esc F9                     In Windows

Properties                                 Alt+Enter                   In Windows

Refresh                                    F5                            In Windows

Rename                                   F2                            In Windows

Save                                        Ctrl+X Ctrl+S             In Windows

Save All                                    Ctrl+X S                    In Windows

Save All                                    Shift+Ctrl+S               In Windows

Navigate

Backward History                      Alt+Left                     In Windows

Forward History                         Alt+Right                   In Windows

Go to Line                                 Ctrl+L                       Editing Text

Go to Line                                 Ctrl+X G                   Editing Text

Go to Matching Bracket              Shift+Ctrl+P               Editing Java Source

Go to Next Member                   Shift+Ctrl+Down         Editing Java Source

Go to Previous Member              Shift+Ctrl+Up             Editing Java Source

Last Edit Location                      Ctrl+Q                      In Windows

Next                                        Ctrl+.                        In Windows

Open Call Hierarchy                   Ctrl+Alt+H                 In Windows

Open Declaration                       F3                            In Windows

Open External Javadoc               Shift+F2                    In Windows

Open Resource                         Shift+Ctrl+R              In Windows

Open Structure                          Ctrl+F3                     Editing Java Source

Open Type                                Shift+Ctrl+T               In Windows

Open Type Hierarchy                  F4                            In Windows

Open Type in Hierarchy              Shift+Ctrl+H              In Windows

Previous                                   Ctrl+                         In Windows

Quick Hierarchy                         Ctrl+T                       Editing Java Source

Quick Outline                            Ctrl+O                      Editing Java Source

Show In menu                           Shift+Alt+W               In Windows

Refactor - Java

Change Method Signature           Shift+Alt+C                In Windows

Convert Local Variable to Field    Shift+Alt+F                Editing Java Source

Extract Local Variable                 Shift+Alt+L In Windows

Extract Method                          Shift+Alt+M               In Windows

Inline                                        Shift+Alt+I                 In Windows

Move - Refactoring                    Shift+Alt+V                In Windows

Redo - Refactoring                     Shift+Alt+Y                In Windows

Rename - Refactoring                Shift+Alt+R                In Windows

Show Refactor Quick Menu         Shift+Alt+T In Windows

Undo - Refactoring                     Shift+Alt+Z                In Windows

Run/Debug

Debug Ant Build                         Shift+Alt+D Q            In Windows

Debug Eclipse Application           Shift+Alt+D E             In Windows

Debug JUnit Plug-in Test            Shift+Alt+D P             In Windows

Debug JUnit Test                       Shift+Alt+D T             In Windows

Debug Java Applet                     Shift+Alt+D A             In Windows

Debug Java Application              Shift+Alt+D J             In Windows

Debug Last Launched                 F11                          In Windows

Debug SWT Application              Shift+Alt+D S             In Windows

Display                                     Shift+Ctrl+D              In Dialogs&Windows

Display                                     Shift+Ctrl+V               In Dialogs&Windows

Execute                                    Ctrl+U                      In Windows

Inspect                                     Shift+Ctrl+I                In Dialogs&Windows

Resume                                   F8                            Debugging

Run Ant Build                            Shift+Alt+X Q             In Windows

Run Eclipse Application              Shift+Alt+X E             In Windows

Run JUnit Plug-in Test                Shift+Alt+X P             In Windows

Run JUnit Test                          Shift+Alt+X T             In Windows

Run Java Applet                        Shift+Alt+X A             In Windows

Run Java Application                  Shift+Alt+X J             In Windows

Run Last Launched                    Ctrl+F11                   In Windows

Run SWT Application                  Shift+Alt+X S             In Windows

Step Into                                  F5                            Debugging

Step Into Selection                     Ctrl+F5                     Debugging

Step Over                                 F6                            Debugging

Step Return                              F7                            Debugging

Toggle Line Breakpoint                Shift+Ctrl+B               In Windows

Toggle Step Filters                     Shift+F5                    In Windows

Search

Open Search Dialog                   Ctrl+H                      In Windows

References in Workspace           Shift+Ctrl+G              In Windows

Show Occurrences in File Quick Menu         Shift+Ctrl+U In Windows

Source

Add Block Comment                  Shift+Ctrl+/                Editing Java Source

Add Import                                               Shift+Ctrl+M              Editing Java Source

Add Javadoc Comment              Shift+Alt+J In Windows

Format                                     Esc Ctrl+F                Editing Java Source

Format                                     Shift+Ctrl+F               Editing Ant Buildfiles

Indent Line                                               Ctrl+I                        Editing Java Source

Open External Documentation     Shift+F2                    Editing Ant Buildfiles

Organize Imports                       Shift+Ctrl+O              In Windows

Quick Assist - Assign to field       Ctrl+2 F                    Editing Java Source

Quick Assist - Assign to local variable Ctrl+2 L              Editing Java Source

Quick Assist - Rename in file      Ctrl+2 R                    Editing Java Source

Remove Block Comment            Shift+Ctrl+\                Editing Java Source

Remove Occurrence Annotations Shift+Alt+U                Editing Java Source

Rename In File                          Shift+Alt+R                Editing Ant Buildfiles

Show Source Quick Menu           Shift+Alt+S                In Windows

Show Tooltip Description             F2                            Editing Ant Buildfiles

Toggle Ant Mark Occurrences      Shift+Alt+O                Editing Ant Buildfiles

Toggle Comment                       Ctrl+/                        Editing Java Source

Toggle Comment                       Ctrl+7                       Editing Java Source

Toggle Comment                       Esc Ctrl+C                Editing Java Source

Toggle Mark Occurrences           Shift+Alt+O                Editing Java Source

Text Editing

Clear Mark                                               Ctrl+G                      Editing Text

Collapse                                   Ctrl+Numpad_SubtractEditing Text

Copy Lines                                               Ctrl+Alt+Down           Editing Text

Cut to Beginning of Line              Alt+0 Ctrl+K               Editing Text

Cut to Beginning of Line              Esc 0 Ctrl+K              Editing Text

Cut to End of Line                      Ctrl+K                       Editing Text

Delete Next                              Ctrl+D                      Editing Text

Delete Next Word                      Alt+D                        Editing Text

Delete Next Word                      Ctrl+Delete                Editing Text

Delete Next Word                      Esc D                       Editing Text

Delete Previous Word                 Alt+Backspace           Editing Text

Delete Previous Word                 Ctrl+Backspace         Editing Text

Delete Previous Word                 Esc Backspace          Editing Text

Delete to End of Line                  Shift+Ctrl+Delete        Editing Text

Duplicate Lines                          Ctrl+Alt+Up               Editing Text

Expand                                     Ctrl+Numpad_Add      Editing Text

Expand All                                Ctrl+Numpad_Multiply Editing Text

Insert Line Above Current Line     Shift+Ctrl+Enter         Editing Text

Insert Line Below Current Line     Shift+Enter                Editing Text

Line Down                                Ctrl+N                      Editing Text

Line End                                   Ctrl+E                       Editing Text

Line Start                                  Ctrl+A                       Editing Text

Line Up                                    Ctrl+P                       Editing Text

Move Lines Down                      Alt+Down                  Editing Text

Move Lines Up                          Alt+Up                      Editing Text

Next Column                             Ctrl+F                       Editing Text

Next Word                                Alt+F                        Editing Text

Next Word                                Ctrl+Right                 Editing Text

Next Word                                Esc F                       Editing Text

Page Down                               Ctrl+V                       Editing Text

Page Up                                   Alt+V                        Editing Text

Page Up                                   Esc V                       Editing Text

Previous Column                       Ctrl+B                       Editing Text

Previous Word                           Alt+B                        Editing Text

Previous Word                           Ctrl+Left                   Editing Text

Previous Word                           Esc B                       Editing Text

Scroll Line Down                        Ctrl+Down                 Editing Text

Scroll Line Down                        Ctrl+Z                       Editing Text

Scroll Line Up                            Alt+Z                        Editing Text

Scroll Line Up                            Ctrl+Up                     Editing Text