Welcome!

Java IoT Authors: Elizabeth White, Yeshim Deniz, Liz McMillan, Zakia Bouachraoui, Pat Romanski

Blog Feed Post

Log-alize Java: Monitoring Java Application Logs

It has been talked about many, many times, so now it is naturally widely-known that any application, especially one that’s in production, must be monitored. When monitoring, it is important not only to evaluate the current status of the application, but, even more importantly, to predict future potential error situations. It is already standard practice that application programs write log files. These usually contain various information from many different points in the application. Therefore it is very important to process the log files in a way that provides an understanding of what’s going on when things go awry. Unfortunately, as might be expected, the files are usually far from ideally-designed and often contain too many details and too much noise.  As a result, it is actually very difficult to glean much useful information from them. Faced with such a situation, you may often prefer just to select pieces of important information from your logs and see these in real time. In this article, the simple but effective solution for selective monitoring of your Java application logs, in real time, is presented.
You may ask – why Java? The answer is simple – because Java has a powerful log engine, called Log4J. Besides that, the Log4J engine has been ported to other popular programming languages (log4php, log4net, log4cxx, log4js, etc.), so perhaps this same approach can be used with those as well.
Log4j provides many extensions and one of these provides for creating custom appenders. Log4J also has a filtering facility that can be used in custom appenders. Thus, the idea is to create a custom appender with filtering which will selectively get information from your log file and send that information to Monitis. There, it can be shown in tabular and graphical form in order to notify the user if something is starting to go wrong.

We have created the generic custom appender with filtering which receives information from Log4J, filters it according to a user pattern (RegExp) and then sends it to Monitis using the Monitis Open API. The custom appender is wrapped in a Jar file and therefore you shouldn’t make any changes in your application. You can use it as is, without any problem.
All that needs to be done is the following:

  • include the log_mon.jar (generic custom appender) in your list of application libraries
  • Using the settings shown below as an example, modify your Log4J configuration file to specify the settings for the Monitis Appender


<appender name="monitisAppender">

       <param name="monitisApiKey" value="2PE0HVI4DHP34JACKCAE37IOD4" />

 

       <param name="monitisSecretKey" value="7OI90FU3C3DA8ENLNJ0JGGOGO0" />

 

       <param name="monitisMonitorName" value="Log_files_monitor" />

 

       <param name="monitisMonitorTag" value="Custom_logger_monitor" />

 

       <param name="monitisSendInterval" value="60000" />

 

       <layout>

 

           <param name="ConversionPattern" value="%d{ISO8601} %-5p [%t]: %m%n" />

 

       </layout>

 

       <filter>

 

           <param name="filterPattern" value="(Error|Fatal|Warn*|Attention)" />

 

           <param name="minAllowedLevel" value="WARN" />

 

       </filter>

 

</appender>

where:

  • monitisApiKey is user personal API key that can be obtained from Monitis user account
  • monitisSecretKey is user personal secret key that can be obtained from Monitis user account
  • monitisMonitorName is user monitor name (any unique name can be chosen)
  • monitisMonitorTag is tag value for user monitors
  • monitisSendInterval is time interval [ms] between sending monitored info to Monitis
  • ConversationPattern is the pattern that will be used by MonitisAppender to format records
  • filterPattern is a pattern-string for selection of log records that you want to monitor

This should be composed as a Java RegEx and correspond to Java Pattern.matches requirements.

(default is no pattern – so all records will be sent to Log Monitor)


  • minAllowedLevel is the log4j records level (ERROR, WARN, DEBUG, etc.) that you want to monitor (default value is WARN)


Notes:

  • the Log4J configuration should be prepared in XML format because Log4J filter supports XML only
  • this approach doesn’t affect your application  performance because Log4J appenders work in separate threads asynchronously
  • it can take more memory to run your application because an additional custom appender works in the same JVM bounds
  • in comparison to other approaches this approach seems much simpler and doesn’t require additional tools. It’s very close to The Cure for Monitoring Java Logs technique, and simplifies it


The sources and more details can be found in the GitHub.

Share Now:del.icio.usDiggFacebookLinkedInBlinkListDZoneGoogle BookmarksRedditStumbleUponTwitterRSS

Read the original blog entry...

More Stories By Hovhannes Avoyan

Hovhannes Avoyan is the CEO of PicsArt, Inc.,

IoT & Smart Cities Stories
Founded in 2000, Chetu Inc. is a global provider of customized software development solutions and IT staff augmentation services for software technology providers. By providing clients with unparalleled niche technology expertise and industry experience, Chetu has become the premiere long-term, back-end software development partner for start-ups, SMBs, and Fortune 500 companies. Chetu is headquartered in Plantation, Florida, with thirteen offices throughout the U.S. and abroad.
The standardization of container runtimes and images has sparked the creation of an almost overwhelming number of new open source projects that build on and otherwise work with these specifications. Of course, there's Kubernetes, which orchestrates and manages collections of containers. It was one of the first and best-known examples of projects that make containers truly useful for production use. However, more recently, the container ecosystem has truly exploded. A service mesh like Istio addr...
SYS-CON Events announced today that DatacenterDynamics has been named “Media Sponsor” of SYS-CON's 18th International Cloud Expo, which will take place on June 7–9, 2016, at the Javits Center in New York City, NY. DatacenterDynamics is a brand of DCD Group, a global B2B media and publishing company that develops products to help senior professionals in the world's most ICT dependent organizations make risk-based infrastructure and capacity decisions.
Nicolas Fierro is CEO of MIMIR Blockchain Solutions. He is a programmer, technologist, and operations dev who has worked with Ethereum and blockchain since 2014. His knowledge in blockchain dates to when he performed dev ops services to the Ethereum Foundation as one the privileged few developers to work with the original core team in Switzerland.
Cloud-enabled transformation has evolved from cost saving measure to business innovation strategy -- one that combines the cloud with cognitive capabilities to drive market disruption. Learn how you can achieve the insight and agility you need to gain a competitive advantage. Industry-acclaimed CTO and cloud expert, Shankar Kalyana presents. Only the most exceptional IBMers are appointed with the rare distinction of IBM Fellow, the highest technical honor in the company. Shankar has also receive...
Headquartered in Plainsboro, NJ, Synametrics Technologies has provided IT professionals and computer systems developers since 1997. Based on the success of their initial product offerings (WinSQL and DeltaCopy), the company continues to create and hone innovative products that help its customers get more from their computer applications, databases and infrastructure. To date, over one million users around the world have chosen Synametrics solutions to help power their accelerated business or per...
DXWorldEXPO LLC announced today that ICOHOLDER named "Media Sponsor" of Miami Blockchain Event by FinTechEXPO. ICOHOLDER gives detailed information and help the community to invest in the trusty projects. Miami Blockchain Event by FinTechEXPO has opened its Call for Papers. The two-day event will present 20 top Blockchain experts. All speaking inquiries which covers the following information can be submitted by email to [email protected] Miami Blockchain Event by FinTechEXPOalso offers sp...
Digital Transformation is much more than a buzzword. The radical shift to digital mechanisms for almost every process is evident across all industries and verticals. This is often especially true in financial services, where the legacy environment is many times unable to keep up with the rapidly shifting demands of the consumer. The constant pressure to provide complete, omnichannel delivery of customer-facing solutions to meet both regulatory and customer demands is putting enormous pressure on...
@DevOpsSummit at Cloud Expo, taking place November 12-13 in New York City, NY, is co-located with 22nd international CloudEXPO | first international DXWorldEXPO and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is no time t...
When talking IoT we often focus on the devices, the sensors, the hardware itself. The new smart appliances, the new smart or self-driving cars (which are amalgamations of many ‘things'). When we are looking at the world of IoT, we should take a step back, look at the big picture. What value are these devices providing. IoT is not about the devices, its about the data consumed and generated. The devices are tools, mechanisms, conduits. This paper discusses the considerations when dealing with the...