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Maven and Cloud Foundry Integration

Cloud Fountry provides as easy integration plugins to move the build packages to its servers through Maven. Here is the sample configuration.

Add Servers to settings.xml

<settings> 
	...
	<servers>
		... 
		<server>
			<id>cloud-foundry-credentials</id>
			<username>cf_user_id_you_created</username>
			<password>cf_password_you_created</password>
		</server>
	</servers> 
</settings>

You can encrypt you password in MAVEN settings. Check out here on how to do it.

Add Dependency and Plugin settings in pom.xml

</project>
	...	
	<build>
		...
		<plugins>
				<groupId>org.cloudfoundry</groupId>
				<artifactId>cf-maven-plugin</artifactId>
				<version>1.1.3</version>
				<configuration>
					<server>cloud-foundry-credentials</server>
					<target>https://url.to.cloud.foundry.com</target>
					<memory>512</memory>
					<appname>application-name</appname>
					<org>ORG_NAME</org>
					<space>SPACE_NAME</space>
					<instances>1</instances>
				</configuration>
				<executions>
					<execution>
						<phase>package</phase>
						<goals>
							<goal>push</goal>
						</goals>
					</execution>
				</executions>
		</plugins>
	</build>
</project>

Thats it !!. Build you project using Maven and check if you application gets deployed into your Cloud Foundry server.

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Activiti REST in Weblogic

When trying to deploy the Activiti REST WAR in WebLogic servers, we found that the requests are reaching the server, but are filtered by the WebLogic server. To make sure your requests reach the Application bypassing the WebLogic filters, you must set the enforce-valid-basic-auth-credentials property in config.xml -> security-configuration to false

...
<enforce-valid-basic-auth-credentials>false</enforce-valid-basic-auth-credentials>
</security-configuration>

From WebLogic servers 9.2 and above, client requests that use the HTTP BASIC authentication must pass WebLogic Server authentication, even if access control is not enabled on the target resource.

The setting of the Security Configuration MBean flag enforce-valid-basic-auth-credentials determines this behavior. (The DomainMBean can return the new Security Configuration MBean for the domain.) It specifies whether or not the system should allow requests with invalid HTTP BASIC authentication credentials to access unsecured resources.

More info at “Understanding BASIC Authentication with Unsecured Resources“.

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Installing Oracle JDK in Amazon AWS EC2 Ubuntu

Lately I tried to install Oracle JDK in one of my Ubuntu servers on Amazon EC2 instance. Unfortunately the inbuilt installers support the installation of OpenJDK.

For some requirements, I was in need of installing a specific version of JDK and test my application, you could get the older version from Oracle Site. I used the following script from one of the blogs, hope it helps someone. 

#!/usr/bin/env bash
wget -O 'jdk-7u80-linux-x64.tar.gz' --no-cookies --no-check-certificate --header 'Cookie:gpw_e24=http://www.oracle.com; oraclelicense=accept-securebackup-cookie' 'http://download.oracle.com/otn-pub/java/jdk/7u80-b15/jdk-7u80-linux-x64.tar.gz'
tar -xvf jdk-7u80-linux-x64.tar.gz
sudo mkdir /usr/lib/jvm
sudo mv ./jdk1.7* /usr/lib/jvm/jdk1.7.0
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.7.0/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.7.0/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdk1.7.0/bin/javaws" 1
sudo chmod a+x /usr/bin/java
sudo chmod a+x /usr/bin/javac
sudo chmod a+x /usr/bin/javaws

The Key here is Oracle need you to accept the license terms before using the any version of Oracle JDK. You could do the same from the scripting by just adding --no-cookies --no-check-certificate --header 'Cookie:gpw_e24=http://www.oracle.com; oraclelicense=accept-securebackup-cookie' params to the WGET.

Alternative, you could download the installers/zip files from external CDNs, like REUCON, move it to EC2 instance through SFTP and install it.

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Adding Oracle Datasource to JBoss EAP server

To add a Oracle Datasource to the JBOSS server, follow the steps

1. In the standalone.xml or in standalone-full.xml

<subsystem xmlns="urn:jboss:domain:datasources:1.2">
		<datasources>
			<datasource jndi-name="java:jboss/datasources/ExampleDS" pool-name="ExampleDS" enabled="true" use-java-context="true">
				<connection-url>jdbc:h2:tcp://localhost/~/jbpm-db-new;MVCC=TRUE;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE</connection-url>
				<driver>h2</driver>
				<security>
					<user-name>sa</user-name>
					<password>sa</password>
				</security>
			</datasource>
			<datasource jndi-name="java:jboss/datasources/JbpmDS" pool-name="JbpmDS" enabled="true" use-java-context="true">
				<connection-url>jdbc:oracle:thin:@localhost:1521:XE</connection-url>
				<driver>oracle</driver>
				<security>
					<user-name>username</user-name>
					<password>password</password>
				</security>
			</datasource>
			<drivers>
				<driver name="h2" module="com.h2database.h2">
					<xa-datasource-class>org.h2.jdbcx.JdbcDataSource</xa-datasource-class>
				</driver>
				<driver name="oracle" module="com.oracle.jdbc">
					<driver-class>oracle.jdbc.driver.OracleDriver</driver-class>
					<xa-datasource-class>oracle.jdbc.xa.client.OracleXADataSource</xa-datasource-class>
				</driver>
			</drivers>
		</datasources>
</subsystem>

2. In $JBOSS_HOME/modules/com/oracle/jdbc/main I have copied the ojdbc6.jar and created the module.xml file.

<?xml version="1.0" encoding="UTF-8"?>
<module xmlns="urn:jboss:module:1.0" name="com.oracle.jdbc">
  <resources>
    <resource-root path="ojdbc6.jar"/>
  </resources>
  <dependencies>
    <module name="javax.api"/>
    <module name="javax.transaction.api"/>
  </dependencies>
</module>

3. Now you could use the JNDI “java:jboss/datasources/JbpmDS” in your application

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Android device showing offline with USB debugging

When I tried to run Android application in my mobile from Android Studio, I stuck with the error stating the application my Device was Offline.

When I run the command adb devices the error as follows

List of devices attached
00b445g34****** offline

To Enable the USB debugging option in Android device

1. Go to Settings, and select Applications > Development
2. Enable USB debugging
3. For Devices with Android KitKat and go to Settings > About devices > Tap 7 times on “Build Number”
4. Once Developer Option is enabled in the Settings, Enable USB debugging
5. Update the Android SDK Tools in Android SDK Manager
6. Traverse to \android-sdk\platform-tools and run adb devices
7. If still the problem exists restart the ADB server

adb kill-server
set ADB_TRACE=all
adb nodaemon server
adb devices

8. The ADB_TRACE will help you trace and resolving the issues like permission and others.
9. If still the problem exists kill the adb process killall adb in linuxoids and taskkill /IM adb.exe
10. Disconnect your mobile, Developer option > Revoke USB debugging authorizations (KitKat and above)
11. Restart your mobile and connect to PC. You will be asked to verify the RSA, do the same and add the device
12. Now try running adb devices, boom the device is online

List of devices attached
00b445g34****** device

The same scenario happened when I tried to run debug my AIR application in Flash developer, follow all the steps above in addition the next few steps too.

1. Copy the following files from \android-sdk\platform-tools aapt.exe, adb.exe, AdbWinApi.dll, AdbWinUsbApi.dll, dx.jar (dx.jar from lib folder)
2. Paste them into \lib\android\bin
3. Run the command adb version from the same folder in command prompt
4. Result should be as follows
Android Debug Bridge version 1.0.31
5. Version should be greater or equal to 1.0.31

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Errors running builder ‘JavaScript Validator’ on project

I got this annoying exception on every auto build of my Dynamic Web Project.

“Errors occurred during the build.
Errors running builder ‘JavaScript Validator’ on project ‘GenieAlert’.
java.lang.NullPointerException”

I was trying to stop the validation of Javascript in the Eclipse properties with the following options,

Windows -> Preferences -> Validation -> Client-side JavaScript Validator -> Checked Manual & Unchecked Build.

This option didn’t work out, then I realized that it happens only on the Build time. The following option came in handy to do that.

Project -> Properties -> Builders -> Unchecked ‘Javascript Validator’

Sometimes when you try to run the Web projects from eclipse on servers these JavaScript validation stops the deployment of the project on servers stating “JavaScript Validation Exception found”. I hope the above solutions will help in those situations too.

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Must have Android apps for developers (Non Android developers)

The below list of apps are note rated or ordered in any ways.

1. AndroIRC – An IRC client application
2. Chrome – Mobile browser
3. Mozilla Firefox – Mobile browser
4. SSH/SFTP Server – Exposing your mobile as a SSH/SFTP server
5. AndFTP – FTP client
6. JuiceSSH – SSH client
7. aLogcat/aLogrec – Logger apps to view or save Android logs
8. Network Info II – Shows info about the phone and the current network, Bluetooth, IPv6 and Cell connection
9. kWS – Android Web Server
10. Google Analytics – Mobile client for Google Analytics
11. WordPress – Mobile client for WordPress dashboard
12. Control Panel for cPanel – Mobile client for cPanel Dashboard
13. File Expert – All in one File manager supporting Windows Samba, FTP, SFTP, FTPS, Webdev, Bluetooth OBEX client

Note: The above app list is used by me and has nothing to do with the other users.

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Famous Short URL services

URL shortening is a technique used to make the URLs substantially shorter in length and still direct to the required page. This is achieved by using an HTTP Redirect on a domain name that is very short in length, which links to the web page that has a long URL.

URL shortening is also used for beautify a link, track the url activity, in some cases to used to disguise the underlying address for legitimate purposes.

Some of the famous URL shortening services are follows:

1. Adf.ly
2. Bit.ly
3. Goo.gl
4. Is.gd
5. Tinyurl.com
6. V.gd

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Bhuvan, The Earth browser – A Geoportal of Indian Space Research Organisation

Most of us would have used the mapping services like Google Maps, Nokia Maps, Bing maps, Wiki Mapia etc on the net. But how many of us knew that we in India have a dedicated Mapping system. Yes, all those PSLV family satellites, Remote sensing satellites from ISRO send us a lot of images; details etc daily and these details are available to the public’s view.

Bhuvan is a Geo-portal of Indian Space Research Organization Showcasing Indian Imaging Capabilities in Multi-sensor, Multi-platform and Multi-temporal domain. This Earth browser gives a gateway to explore and discover virtual earth in 3D space with specific emphasis on Indian Region. The other services provided by the Bhuvan are Land services, Ground water prospects, Weather services, Ocean services, Disaster services

The Mapping system provides both the 2D and 3D viewing capability and can see information that is otherwise dry and academic, in ways that are visually fascinating. It helps you capture large databases of satellite data, which can be transformed into 3D presentations that capture the imaginations of the rest of us. Users can experience the comprehensive globe with multi resolution imagery, thematic information, historical multi temporal imagery, and other points of interest. As a User we can explore and visualize the world in a 3D landscape along with all other wide ranging tools to explore Bhutan.

Bhuvan also provides a mobile version of its site and can be accessed from here.

As a feast for developers, Bhuvan also provides the API’s to embed a true 3D digital globe, into the web pages. Using the API you can draw markers and lines, drape images over the terrain, allowing you to build sophisticated 3D map applications.

Bhuvan Quick Tour:

If you are unable view the video, click Here to download.