java-ffmpeg-pipe-memcache

Just a cross link https://github.com/yev/java-ffmpeg-pipe for github repo with simple code example which demonstrates how to push snapshot grabbed by ffmpeg from a video stream to a memchache server without intermediate File System calls.


The schema describing the interactions between all components:

Actually, the RTMP stream can be replaced with a whatever source which can be read by ffmpeg.

Best java client for swift (OpenStack storage) - JOSS

Recently, I had a task to choose a java client for interacting with OpenStack Storage service aka Swift.

I recommend you JOSS

Actually, I found 3 open source projects on GitHub:

1. https://github.com/dkocher/java-openstack-swift
2. https://github.com/woorea/openstack-java-sdk
3. https://github.com/javaswift/joss

After testing and working for a bit with each library I ended up with the following conclusion - the best one is JOSS - http://joss.javaswift.org

So, now the list of advantages:

1. openstack-java-sdk is a huge library for almost all OpenStack services. I needed only swift driver so I wasn't interested to add useless dependencies. Always use KISS principle.
2. java-openstack-swift from dkocher - I didn't manage to make a connection to my swift proxy. Maybe this library is very good and written by smart people, but the documentation is poor. If a developer should dig into the code source to figure out how to make the basic simple step, this will increase the learning curve. One more little disadventage is absence of the project in maven central repo. 
3. And finally the winner - JOSS - https://github.com/javaswift/joss by Robert Bor. 

Why JOSS:

1. Very simple API. 
2. The principle of modern fluid API building is used. The API is readable and comprehensible.
3. Good documentation for each common task (authentication, uploading, downloading, etc)
4. Available at standard maven repo.
5. Excellent support organised by the project author - Robert Bor. He helped me within few hours to find an error in my configuration and pleased me with his reaction and quality of responses.

BuildNumber Component for Yii framework

Today I have committed the build number component for Yii framework.

This component is very simple but yet powerful and useful for industrial and enterprise-wide applications.

The project is hosted on GitHub - https://github.com/yev/yiiGitBuildNumber

Java 7 list of new features

I've just put the link here to find it quickly:

http://docs.oracle.com/javase/7/docs/webnotes/adoptionGuide/index.html

This is an adoption guide for java 7 with the list of all new features (from official Oracle site).

Crypt password with salt in Yii framework

Hello,

Today I will share my experience while learning PHP and Yii framework by using the standard PHP function crypt.

First of all, here you can find some basic theory about why do you need use salt to encrypt the passwords.

Let's discuss the parts of your Yii app you should modify in order to benefit the more robust security for password encryption:

1. You should create (or generate with vii) User model with userName, userPass and userSalt fields. 
2. While saving the new user in your Database, you should encrypt the user password with randomly generated salt. I do this in User Model class, by overriding the method beforeSave. Like this:

   protected function beforeSave()
       {
           if(parent::beforeSave())
           {
               if($this->isNewRecord)
               {
                   $this->user_salt=   utf8_encode( mcrypt_create_iv(30) );
                   $newPassword =  utf8_encode( crypt($this->user_pass, $this->user_salt) );
                   $this->user_pass = $newPassword;
               }
               return true;
           }
           else
               return false;
       }
   

   
   Code explanation:
   - use standard PHP 5.4 mcrypt_create_iv function to generate the salt (this function available only since version 5.4);
   - use standard crypt function with 2 parameters - first is the user password and the second one is the salt.
   - I'm using the standard PHP utf8_encode function for properly view the password and salt in the Database. It's not mandatory.
3. The last step is modifying the existing authentificate method from protected/components/UserIdentity.php to check the credentials against the Database with salted password:

   public function authenticate()
    {
   
           $record=User::model()->findByAttributes(array('user_name'=>$this->username));
           if($record===null)
               $this->errorCode=self::ERROR_USERNAME_INVALID;
           else if($record->user_pass !==  utf8_encode( crypt($this->password,$record->user_pass))){
               $this->errorCode=self::ERROR_PASSWORD_INVALID;
           }
           else
           {
               $this->username=$record->user_name;
               $this->errorCode=self::ERROR_NONE;
           }
   
           
           return !$this->errorCode;
    }
   

   The code is obvious except the line 7 while we are using the function crypt where the second parameter is the encrypted user password(not salt)! Eh, yes, as the documentation of crypt function says, you should always use the encrypted data as a salt. If you will pass the $record->user_salt, you will get the wrong string that will not match your encrypted password. This trick caused me to spend few hours on debugging the issue.

Liferay : how to fix NoSuchBeanDefinitionException while portlet deploying

I would like to share the fix for mysterious and annoying issue that I've encountered during the development and deploying of a portlet for Liferay 5.2.3.

The error that Liferay server (Tomact) listed in the logs was related to misconfigured Spring beans and the exception was org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'my.service.persistence.SynergieCategoryPersistence.impl' is defined 
The partial stacktrace is belows:

16:36:12,700 ERROR [PortalClassLoaderServletContextListener:92] org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'my.service.SynergieCategoryLocalService.impl': Injection of BeanReference fields failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'my.service.persistence.SynergieCategoryPersistence.impl' is defined
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'fr.smile.synergie.service.SynergieCategoryLocalService.impl': Injection of BeanReference fields failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'my.service.persistence.SynergieCategoryPersistence.impl' is defined
 at com.liferay.portal.spring.annotation.BeanReferenceAnnotationBeanPostProcessor.postProcessAfterInstantiation(BeanReferenceAnnotationBeanPostProcessor.java:67)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:959)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:472)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
 at java.security.AccessController.doPrivileged(Native Method)
 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:429)
 at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:728)
 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:380)
 at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:255)
 at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:199)
 at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:45)
 at com.liferay.portal.spring.context.PortletContextLoaderListener.contextInitialized(PortletContextLoaderListener.java:77)
 at com.liferay.portal.kernel.servlet.PortalClassLoaderServletContextListener.portalInit(PortalClassLoaderServletContextListener.java:89)
 at com.liferay.portal.kernel.util.PortalInitableUtil.init(PortalInitableUtil.java:47)
 at com.liferay.portal.kernel.servlet.PortalClassLoaderServletContextListener.contextInitialized(PortalClassLoaderServletContextListener.java:73)
 at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3843)
 at org.apache.catalina.core.StandardContext.start(StandardContext.java:4342)
 at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
 at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
 at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)
 at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:926)
 at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:889)
 at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)
 at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1217)
 at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:293)
 at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
 at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1337)
 at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)
 at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)
 at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)
 at java.lang.Thread.run(Thread.java:680)
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'my.service.persistence.SynergieCategoryPersistence.impl' is defined
 at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:387)
 at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:971)
 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:246)
 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
 at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:880)
 at com.liferay.portal.bean.BeanLocatorImpl.locate(BeanLocatorImpl.java:59)
 at com.liferay.portal.kernel.bean.PortalBeanLocatorUtil.locate(PortalBeanLocatorUtil.java:58)
 at com.liferay.portal.spring.annotation.BeanReferenceElement.getResourceToInject(BeanReferenceElement.java:70)
 at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:180)
 at org.springframework.beans.factory.annotation.InjectionMetadata.injectFields(InjectionMetadata.java:105)
 at com.liferay.portal.spring.annotation.BeanReferenceAnnotationBeanPostProcessor.postProcessAfterInstantiation(BeanReferenceAnnotationBeanPostProcessor.java:64)
 ... 36 more

The portlet classes have been generated by build-service and the same code worked fine during last 2 years. So I was pretty sure that my Spring config is OK and the problem resides in the other part of the system.

After few days spent in debug mode, I have found that while deploying the portlet, the folder WEB-INF/lib was missing the jar file util-java.jar.
Obviously, util-java.jar is needed by Liferay to make some stuff. And apparently, in my case, this jar have not been copied automatically by Liferay hot deployer.

I have copied the missing util-java.jar to WEB-INF/lib and portlet has been deployed without any error.

Software Industrialization presentation

Few days ago I had to make a presentation about the software industrialization approaches at Octetis (the international IT company for whom I'm currently working).

The result is here - one page PDF document:

The one thing to share is about very beautiful and complete Project Gallery from MS Word for Mac.

All styles, fonts, document structure, etc. were available out of the box. All the other stuff was created using PowerPoint for Mac as well.

Merci Microsoft & Apple.

Maven BuildNumber plugin - short revision id for Git

Today, I would like to explain the improvement for maven plugin - buildNumber, that I talked in my previous message - short revision id for Git SCM.

IMPORTANT : This feature is present in the maven-buildnumber-plugin 1.1 version.

You can specify the length for the Git revision. To enable this feature you have to specify the new tag

<shortRevisionLength>

in the

<configuration>

section. For exemple:

The associated maven output informs us about the detection of shortRevisionLength tag and print the length of the revision that will be used in buildNumber formatting:

Some implementation details

This feature uses internally the git rev-pasre --short (see associated git help section) command and the revision length is set to minimum 4 characters. So you can't have the revision id shorter then 4 characters. Even if you specify the length between 0 and 4, the plugin will inform you about this situation and the minimum value (4) will be used.

UPDATED: If your maven build can't find the dependency for maven-buildnumber-plugin 1.1 , try to force the dependency update  by adding option "-U" for your mvn command.

My first Open Source commitment - Git short revision

Today, my patches for 2 maven projects have been accepted by the maven-buildNumber-plugin's project lead Olivier Lamy.

One of the web Java project, I currently working on, is fully automated with Maven. One interesting and useful thing is to have the date & the revision number at the bottom of the web page. Like this:

It was done with excellent maven plugin buildNumber - http://mojo.codehaus.org/buildnumber-maven-plugin

The problem was that the project SCM migrated from the SVN to Git. And the revision ID in Git is too long. In fact it's SHA-1 sequence that should be unique across the world and all possible revisions... So the build id at the bottom of the page was so ugly for business users that I receive the task to make it shorter.

After asking the question about the git short revision id in StackOverflow.com and in the user's mailing lists of the maven, I understood that the buildNumber plugin does not support this feature. And the project Lead, Olivier Lamy, gracefully proposed to me to make a patch and pointed out the first java class I have to look at.

The code he sent me was very clear and I quickly figured out how to add the new feature that I called shortRevisionLength.
After one day of working I have sent the patch to Olivier and created 2 issues on the codehouse JIRA server:

1. http://jira.codehaus.org/browse/MBUILDNUM-86
2. http://jira.codehaus.org/browse/SCM-664

I added some test cases and the documentation patch as well.

The next day the patch has been approved and integrated in the SVN. So, the next version of buildNumber plugin 1.1 contains some peace of code from Ukraine :) Nice.

Install Pear on Windows 7

Just a little tips about installing PEAR for PHP on Windows 7.

I have spent 3 hours today to install PEAR on Windows. I had systematically the error, when I was trying to execute config-set auto_discover 1 in the CMD:

PEAR_Config::writeConfigFile fopen('C:/Windows/pear.ini', 'w') failed... permission denied

It was clear that the problem in the PEAR installation - the location of pear.ini file was wrong. It's important to note, that all installation and manipulation with pear I made with basic CMD.

If you have the same problems, you have to reinstall your PEAR with PowerShell.

With PowerShell the pear.ini is in the PHP folder and it will fixe all the problems