CentOS : Maven install Script(.sh)

#download maven tar
wget http://mirror.cc.columbia.edu/pub/software/apache/maven/maven-3/3.0.5/binaries/apache-maven-3.0.5-bin.tar.gz
#untar
tar xzf apache-maven-3.0.5-bin.tar.gz -C /usr/local/
#delete unnecessary back-up
rm -f apache-maven-3.0.5-bin.tar.gz
#install
cd /usr/local
#create symlink
ln -s apache-maven-3.0.5 maven
#create environment vars
export M2_HOME=/usr/local/maven
export PATH=${M2_HOME}/bin:${PATH}
#check installation
mvn -version

Download CentOS Maven Install Script(.sh) from Here.

Getting started with PhoneGap/Cordova with CentOS, First Helloworld android app using PhoneGap/Cordova

Install Cordova:

On Linux/CentOS:

To install Cordova you will first need to install the npm utility of  Node.js.

1. yum install nodejs
2. yum install npm

Then install cordova:

1. npm install -g cordova

Install Android-SDK:
If you haven't yet installed Android SDK do the following:

Install prequisite libs:

1. yum install glibc.i686 glibc-devel.i686 libstdc++.i686 zlib-devel.i686 ncurses-devel.i686 libX11-devel.i686 libXrender.i686 libXrandr.i686

Download android-sdk from http://developer.android.com/sdk/index.html

(For CentOS 32bit:

http://dl.google.com/android/adt/22.6.2/adt-bundle-linux-x86-20140321.zip)

Unzip it to a directory.It will be a good idea to rename it.(e.g. /usr/local/android/).Run the following commands:

1. cd /usr/local/
2. wget http://dl.google.com/android/adt/22.6.2/adt-bundle-linux-x86-20140321.zip
3. unzip adt-bundle-linux-x86-20140321.zip
4. #backup can be deleted now, your choice
5. rm adt-bundle-linux-x86-20140321.zip
6. mv adt-bundle-linux-x86-20140321/ android/

Browse it and make sure that the following directories exist and contain all files:
/usr/local/android/sdk/platforms
/usr/local/android/sdk/platform-tools
/usr/local/android/sdk/tools
Now add path variables to environment:

1. echo "export PATH=$PATH:/usr/local/android/sdk/platforms" >> ~/.profile
2. echo "export PATH=$PATH:/usr/local/android/sdk/platform-tools" >> ~/.profile
3. echo "export PATH=$PATH:/usr/local/android/sdk/tools" >> ~/.profile

Now load them for using in current session:

1. source ~/.profile

Now install Ant. Ant version 1.8+ is needed for this purpose.


Uninstall previous old ant version:

1. #uninstall if already old versions are there
2. yum remove ant

Run the script from here to install ant 1.9:
http://mohiplanet.blogspot.com/2014/06/centos-ant-19-install-scriptsh.html

You will also need ant apache regex utility.Install it by running :

1. yum install ant-apache-regexp

Create Helloworld Cordova Project:
cd to a convenient directory and run:

1. cordova create hello com.example.hello HelloWorld

This should create a hello directory in current location.Navigate to hello directory where the config.xml file is located:

1. cd hello/ && ls

You will see something like:
config.xml  hooks  merges  platforms  plugins  www

Run the following command to prepare the helloworld project for android platform:

1. cordova platform add android

This will generate required files for helloworld project to run in android.
Run the follwing command to see what platforms are already added in the project:

1. cordova platforms ls

You will see something like this:
Installed platforms: android 3.5.0
Available platforms: amazon-fireos, blackberry10, firefoxos, ubuntu
Build the project:
Build the project by following command:

1. cordova build

Run the project:
Run the following command to run the app on android emulator:

1. cordova emulate android

Now what you just see is the html page located at:
YOUR_PROJECT_ROOT_DIR/www/index.html
You can edit the file and run 'cordova emulate android' again to see the changes.
Debugging the application (Seeing logs):
You can run:

1. adb logcat

on a seperate window to see android logs.This will produce huge logs, so I would recommend using:

1. adb logcat|grep Cordova

This will produce logs created by only Cordova.Sample cordova logs:
 adb logcat|grep Cordova
- waiting for device -
I/CordovaLog(  958): Changing log level to DEBUG(3)
I/CordovaLog(  958): Found start page location: index.html
D/CordovaActivity(  958): CordovaActivity.onCreate()
D/CordovaWebView(  958): CordovaWebView is running on device made by: unknown
D/CordovaActivity(  958): CordovaActivity.init()
D/CordovaWebView(  958): >>> loadUrl(file:///android_asset/www/index.html)
W/System.err(  958):  at org.apache.cordova.CordovaWebView.loadUrlIntoView(CordovaWebView.java:457)
W/System.err(  958):  at org.apache.cordova.CordovaWebView.loadUrlIntoView(CordovaWebView.java:444)
W/System.err(  958):  at org.apache.cordova.CordovaWebView.loadUrl(CordovaWebView.java:414)
W/System.err(  958):  at org.apache.cordova.CordovaActivity.loadUrl(CordovaActivity.java:395)
D/CordovaWebView(  958): >>> loadUrlNow()

Distributing your app(Generating .apk):

When you run:

1. cordova build

A distributable .apk is genarated at  YOUR_PROJECT_ROOT_DIR/platforms/android/ant-build/
In this example the auto-generated .apk will  be YOUR_PROJECT_ROOT_DIR/platforms/android/ant-build/HelloWorld-debug.apk
But this a debug version.To build release version simply do:

1. cordova build --release

This will generate an unsigned release version of your app like YOUR_PROJECT_ROOT_DIR/platforms/android/ant-build/HelloWorld-release-unsigned.apk 

To sign your app with your company profile please visit:

http://developer.android.com/tools/publishing/app-signing.html

References:-
http://cordova.apache.org/docs/en/3.0.0/guide_cli_index.md.html
https://wiki.echocat.org/display/ECHOCAT/2012/08/17/Configure+Android+SDK+on+CentOS+6+x86_64

Linux/CentOS : Ant 1.8 / 1.9 / install script(.sh)

Because yum will always download old versions.Let's download Ant 1.9 with .sh script.This will do the work:

1. #make sure opt directory exists
2. cd /opt/
3. #download
4. wget http://mirrors.ispros.com.bd/apache//ant/binaries/apache-ant-1.9.4-bin.zip
5. #unzip and remove zip(you choice)
6. unzip apache-ant-1.9.4-bin.zip && rm apache-ant-1.9.4-bin.zip
7. cd apache-ant-1.9.4/
8. #create symlinks
9. ln -s /opt/apache-ant-1.9.4 /opt/ant
10. ln -s /opt/ant/bin/ant /usr/bin/ant
11. #add environment variable
12. echo 'ANT_HOME=/opt/ant' >> /etc/environment
13. #apply changes on current session
14. source /etc/environment

Be sure to download wget before running the script

Download script Install Ant 1.9.sh

Google App Engine(GAE) : Rolling back previous incomplete deployment(running appcfg roolback)

While deploying Google App Engine web app you may face:
"GAE appcfg rollback not working: 409 Conflict Another transaction by user is already in progress for app".
To fix this got to APP_ENGINE_SDK_DIRECTORY/bin where the appcfg.sh is located:
Run this command there:
sh appcfg.sh rollback GAE_APP_DIR/
where GAE_APP_DIR: your project directory where the WEB_INF foler is located example:
sh appcfg.sh rollback GAE_APP_DIR/web/

Spring MVC + JSON : fixing error 406 (Not Acceptable)

This may happen while using Spring controllers like this:

1. 
   
2. @RequestMapping(value = "/getbirds", method = RequestMethod.GET, produces = "application/json")
3.     public @ResponseBody
4.     List<Bird> getBirds(@RequestParam("term") String term) {
5. List<Bird> lst;
6. //..........
7. return lst;
8. }



@ResponseBody annotations don't use normal view resolvers, they use their own.Put this in your dispatcher-servlet:

1. <bean id="jacksonMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"></bean>
2. <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
3. <property name="messageConverters">
4. <list>
5. <ref bean="jacksonMessageConverter"/>
6. </list>
7. </property>
8. </bean>

You may need to put this dependency in your pom.xml:

1. <dependency>
2.             <groupId>org.codehaus.jackson</groupId>
3.             <artifactId>jackson-mapper-asl</artifactId>
4.             <version>1.8.0</version>
5.         </dependency>

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