Java – The Best Career Option For You

Java is one of the best things to have happened to the IT after the C++ programming language. It is the foundation of many websites, server-based and web-based applications and programs and is a great career option for the programming sector. Speaking of career development, you have an excellent scope in Java programming as it combines technical knowledge with creative thinking to create a product that could change the face of the Programming Language. However, what are the other aspects that make Java a fantastic career option for our future programmers? Read on to find the answer to this question.

Java jobs

   1. What is Java all about?

In simple terms, Java can be described as an object-oriented programming that simplifies coding and develops applications for software developers. Apart from being free of cost, it is user-friendly, highly secure and can be worked using reusable codes. It works on independent multiple platforms, and can automate memory management. It comes with reliable features such as frameworks, developmental equipment, APIs, IDEs and libraries. Java also allows embedded computing which helps in advancing personalised big data solutions.

   2. New developments in Java

Java has recently made a few changes in its features, which are some of the reasons which is so well-known in IT sectors.

a) Java has been recommended by Google for Android App Designing.
b) A feature known as Lambda Expressions of Java helps in functioning programming style coding.
c) The Interface with a Static and Default approach redesigns the system to help with present interface without execution.
d) Java has replaced the PermGen Space with a Metaspace for JVM Metadata storage.
e) Though not officially a default feature, you do get a Garbage collection option in Java.
f) You can work on I/O in Java using the Java.nio library.
g) You are assured of data security, thanks to its multiple security features.
h) Works with simple software development, and comes with a set of APIs.

  3. What are the career options for Java?

Java programmers can work with top software companies in a variety of fields such as web developers, application developers, app developers, software developers, web programmer and EJB programmer. Senior programmers can go on to work as Project Managers and Senior Managers in IT industries. Software industries always look for Java programmers to develop online web-based and server-based applications, firm applications and software industries – which generate a great income.

Candidates can even try for career options in Java Programming, Application Development along with EJB, Operating System Fundamentals, Programming, Software Engineering, Servelets and JSP Programming, Object Oriented Concept, Java for Android and Web Development, to name a few. The salary of a beginner-level Java programmer can range from Rs. 2 lakh to Rs. 5 lakh per annum. However, as in any job sector, your salary and perks also greatly depend on your qualifications and certificate courses, if any.

  4. The search for a good Java Institute

It is important to pursue Java Programming from a good institute to reap its career benefits. Therefore, you should look for premier institutes that offer the availability of various career options, regular online assistance, laboratory and practical facilities, live projects and lastly, the promise of a good income. Only such high-quality certification or training courses from good institutes would add value to your resume.

Java jobs Rajkot is thus one of the most preferred career options for the tech-savvy generation. Not only does it offer excellent pay, you would also be assured of complete job satisfaction and be able to present a successful corporate image of yourself within a short time.

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Why Java Developers Need Java Messaging System?

This post shares info on Java Messaging System. Java developers are using it in their practice for several reasons. You can read the post and find the reasons.

Why messaging system?

In the electronics world, data is the actual term used for all information. For which data, “Message” term can be used? Let’s take simple scenario, if you are registering your details in the web portal, it takes all your information and store entire data in relational database which will be called as a Data. Once you registered successfully, an email functionality triggers and send an email to you saying that account is successfully created. This email event is called as messaging.

In traditional system, both registering new user and sending email are tightly coupled i.e. both are in same application. This design is extremely responsible for the system’s performance. Imagine 100s of user registering in 15 minutes, the same application should focus creating new user and sending email. This process is too costly. To avoid this issue, messaging systems are come into picture.

 It runs independently and just looks up for the message and doesn’t care about where messages are coming from. If the message arrives, it consumes the message and sends it to destination. This is called as loosely coupled and both applications run independently.

The responsibility of Web Portal is to create new user and to send email to user is messaging system’s responsibility. Messaging system is not only used for sending email. There are many scenarios where we need Messaging system such as notification, news feed etc.

There are many messaging system in the market. Rabbit MQ is one of such popular messaging systems in Java, which includes three roles – publisher, subscriber and queue.

Publisher is the one who sends the message. The sent message will store in temporally in a buffer called queue. Subscriber is the one who receives the message. The Rabbit MQ is having all these players that are required for messaging service.

Why we need Apache Kafka?

Since there are more matured messaging systems available in the world, why we need Apache Kafka? That’s a question that triggers developer’s mind.

The other messaging systems handle only low volume data. But Rabbit MQ handles 20K messages per second. Apache kafka handle 100K messages per second. Kafka provides easy way to create many kafka clusters which is called as broker. This is for maintaining load balance. If one broker gets down, the other automatically takes care.

Apache kafka persists the messages in hard disk and java developers can set life time of message.

Following players are included in the Apache Kafka in messaging system-

  • Topics
  • Producer
  • Brokers
  • Consumer

Topics

Topics hold the stream of messages. For example Topic “A” can hold the message “Hello World”. If we create a topic, kafka creates by default one partition. Partition contains sequence of index in which messages are get stored. Based on our requirement we can create many partitions in Topics as in the diagram.

Topic “A”

Partition 1
0
1
2
3
4
5
Partition 2
0
1
2
Partition 3
0
1

Producer

Producer uses the topics to send the messages to broker.

Consumer

Consumer receives the messages from broker.

Broker

Broker acts like a middleware component for producer and consumer. If producer sends messages, those messages are maintained in broker. Consumers consume messages from broker.

Using kafka cluster we can create multiple brokers which maintain the messages and load balance. The beauty of Kafka broker is that it can handle many read/writes manipulation without any performance tuning.

The entire Kafka cluster runs in Zookeeper.

What is zookeeper?

Zookeeper is an environment that maintains all Kafka broker and its state. If any Kafka broker is down or not available, Zookeeper is liable to notify Consumer/Producer, so Consumer/Producer will start looking into another available Broker.

System diagram for Kafka messaging system:

Kafka messaging system environment

Kafka messaging system environment

Who are Leaders and Followers?

I have already told that we can create many Kafka brokers in which one Kafka broker is primary broker that handles all manipulation between Producer and Consumer. This Kafka is called as Leader and other Kafka brokers are called as followers. Due to some situation the leader Kafka is down or shut down for any reason, zookeeper selects a new leader from available follower, and notifies to Consumer/Producer about the new Kafka leader. Consumer/Producer starts looking into correct Kafka broker.

Kafka messaging system setup

Download zookeeper from following Apache link

http://www.apache.org/dyn/closer.cgi/zookeeper/

After download go to download folder and open conf folder

zookeeper-3.4.6\conf

You can see zoo_sample.cfg

Copy the this file as zoo.cfg

Open zoo.cfg

Change following property with correct path.

Data Dir=<Your path>

Zookeeper store all data in this path

You have done with Zookeeper configuration and this is a time start zookeeper server.

3

Double click highlighted file(zkServer) to start the zookeeper. You can see following console after starting the Zookeeper successfully.

4

Now we have configured Zookeeper for your Kafka server.

Download Kafka from following apache link

https://www.apache.org/dyn/closer.cgi?path=/kafka/0.9.0.0/kafka_2.11-0.9.0.0.tgz

Extract the Kafka download folder as in below screenshot.

5

Go to bin folder and apply following command to start Kafka server.

kafka-server-start F:\Work\kafka\kafka\kafka_2.11-0.9.0.0\config\server.properties

This command starts your Kafka server.

If you want to stop kafka server, go to kafka_2.11-0.9.0.0\bin\windows and click kafka-server-stop

If you are using Linux, go to kafka_2.11-0.9.0.0\bin\

Now we have kafka server that is ready to start. Once you started the kafka server, you can see following console

6

Kafka Producer

publicclass MyProducer

{

                publicstaticvoid main(String[] args) throws Exception{

                                Properties props = new Properties();

                                props.put("bootstrap.servers", "localhost:9092");

                                props.put("acks", "all");

                                props.put("retries", 0);

                                props.put("batch.size", 16384);

                                props.put("buffer.memory", 33554432);

                                props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");

                                props.put("value.serializer", "org.apache.kafka.common.serialization.StringSerializer");

                                 Producer<String, String>producer = new KafkaProducer(props);

                                for(inti = 0; i< 5; i++) {

                                                producer.send(new ProducerRecord<String, String>("test-topic", "Test-Key " + (i+1) ,"Test-Value" + (i+1)));

                                                }

                                producer.close();

    }

}

The above code sets necessary configuration for Kafka producer and creates a new topic called “test-topic” which carries the five different messages. This topic message is sent by producer using producer.send method.

Kafka Consumer

publicstaticvoid main(String[] args) {

                //Kafka Consumer configuration

 Properties props = new Properties();

 props.put("bootstrap.servers", "localhost:9092");

 props.put("group.id", "test");

 props.put("enable.auto.commit", "true");

 props.put("auto.commit.interval.ms", "1000");

 props.put("session.timeout.ms", "30000");

 props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");

                props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");

                      KafkaConsumer<String, String>consumer = new KafkaConsumer(props);

                consumer.subscribe(Arrays.asList("test-topic"));

while(true){

         ConsumerRecords<String, String>records = consumer.poll(100);

                                for (ConsumerRecord<String, String>record : records)

                                                  System.out.println("Partition Offset = " + record.offset() + " Key = " +  record.key() + " Value = " + record.value());

                                  }

}

In the above code sets, the necessary configuration for kafka Consumer and receiving messages from a producer. The Producer carries the messages via topic called “test-topic”.

Boostrap.servers

It will start up all available brokers in the kafka

Group.id

We can set group name for multiple consumer. In our case our consumer belongs to test group.

enable.auto.commit

It will commit the offset value based on auto.commit.interval.ms

session.timeout.ms

Using this timeout we can find out any failures in Kafka server.

Key.deserializer and value.deserializer

This is for internal string serialization process for message data.

Acks

This property is having three possible value which are 0, 1 and all. If set 0, producer doesn’t wait for acknowledgement. If set 1, producer accepts ack from leader, if set all, producer accepts ack from all replica i.e. if your kafka server is having more than 1 broker, it accepts the ack from all (Both leader and follower).

Retries

Number of try for sending messages to Consumer

batch.size

Buffer size for batch size. Let say producer is sending multiple messages to a partition, he will use the batch.size.

buffer.memory

The buffer.memory used by producer for sending messages.

Hope you have understood what Java Messaging System is and why java developers use it. If you have any question, ask from experts and get answered.

How To Protect Your Intellectual Property While Outsourcing Java Development Projects

Intellectual assets or property of a person or a company hold many intangible things that are usually not visible through eyes, but valuable to someone. It includes trade secrets, designs, artistic work, trademarks, copyrights, concepts, company’s data, etc.

Companies encounter heavy competition and thus, they all need to protect their secret data from competitors and other third parties. This is why it is crucial to protect all your intellectual property while planning for outsourcing development project.

The requirement for outsourcing web development is rising with time and especially .net, PHP, and java development outsourcing have emerged as the significant and often outsourced web technologies. Protecting intellectual property is the concern for companies and businesses.

Many times businesses have caught unethical companies that have been misusing the technologies and intellectual property of clients. How the enterprises can protect their secret data and keep it safe forever?

Intellectual property

Here Are Few Tips That Will Help You Out

  • Well documented information security management policy

You must enquire about the information security management policy of a vendor prior providing your project details to them. There is a specific set of rules and regulations that every professional and vendor follows while handling the secret data of their clients. In case you find that the service provider is not taking the policy seriously or there is no policy, then you must look for another IT development firm.

Genuine vendor will provide project development policy and almost every vendor has a system in which every member of the company needs to sign a confidential agreement. You can search such vendor for your project.

  • Never explain the whole project, provide them required information only

This is one of the best ways to lower the risk of confidential property theft. You can set a limit on information you share with company regarding your project.

  • Source code and software ownership

It is important to clarify the ownership of the source code before they start with the project. There are companies and developers who agree to provide complete ownership of the source code and software, but then there are vendors exploit situations where clients don’t make first move towards discussion for the topic.

It hardly matters if your requirement is large or small; you should understand that safety of your data is critical thing that should not be compromised. When you think of hiring java development outsourcing vendor, you should select the one who meets all your requirements and above tips.

“Hire Java Developers, Superheroes In Their Profession”

Corporate segments these days are plagiarizing themselves in extracting hidden talent even more. Whether you are trying to construct anything, if I talk about apps, websites and many other functions, every requirement has a code.

java superheroOnce an engineer stated that ‘We believe in constructing codes through brilliant minds’, so all I can say is that coding has now become the part and parcel of our lives. Today software engineers can write series of programs and generate heavy salaries per month. This is what has inspired them to live create innovation in the way coding is done. Yes, although it requires talents to generate codes, but I will say that ‘Now coding has given a sip of coffee to drink’. Least you can go through the online job portals you’ll surely find 10 openings only for the Java developers as compared to any other job postings.

Well, these days, hiring Java developers has become a prime requirement of every leading organization because they require talents to give desired outcomes. And engineers too are technological savvy because all they do think is that they pick challenging jobs to settle abroad and live a technologically-oriented luxurious life. There are several rules that need to be considered while hiring Java developers and they are as follows:

  • Hire the top graded candidates: Yes, this rule states that you can hire the well experienced professionals who are passionate about creating codes in particular format.
  • Java developers are superheroes in their profession: Yes, Java developers are the superheroes of their programming firms. They can create a team of superheroes that would again help in gaining results from the extremely talented minds.
  • Hire only talented individuals: Java professionals seeking interviews should hire only talented individuals who are passionate about coding. Well, with the growing population of engineers in India, a half of the job postings will be reserved only for the Java developers as compared to any other job openings.
  • Be your own small organization: You can seek advantage of this, because large Multinational organizations seek to outsource work to the small firms who have a passion to create codes and who have talented professionals who can be multitaskers too.
  • It’s more on work: Anything that you do requires passion and the abilities to stand firmly on your toes. Yes, it’s a bit difficult but your only passion for your work can lead you to create rainbows.
  • Open source platform invites opportunities: Yes, open source platform invites new talents and also draws new opportunities and also you get overwhelming responses from the applicants. Once, you start posting your job requirements, this is the stage when you start receiving pool of applications from the interested peers. Well, this is also an opportunity for you to be recognized and also to be known by all.

There are many places in which individuals can apply for their passionate jobs. But, this field of hiring Java developers occupies a very special position in the heart of all the passed out engineers.

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Essential Frameworks For Trailblazing Java Web Development Solutions

The enterprises using java apps and java web development frameworks are increasing every day. But the problem is that few enterprises are still using conventional web frameworks and they are not pretty much sure about the best web development framework. Even experts are not sure about best framework as there are plenty of choices available and all of them have some unique and interesting features.

In brief we can say web arena is facing a broad change due to technology advancements, market trends, and experts’ choice. This is the reason after deep research and expensive hands-on experience in Java; we have concluded 10 most popular web development frameworks that will help you in making the right decision.

Let us discuss on all of these frameworks for trailblazing web development solutions one by one :

  1. Struts 2

The robust web development framework has been designed to build enterprise web apps from sourcing to deployments. The framework is result for combined efforts of Strut community and WebWork. The best part is that it can create dynamic responses.

“Struts 2” is an improved version of previous one that assures clean code for web apps. It uses AJAX tags to create flexibility and making web apps more interactive. The Java developers who wants to play with open source code, struts 2 is recommended option.

  1. JSF

JSF is used to prepare server side interfaces for web applications. JSF is based on component oriented approach not on object oriented that makes java web development easy and more robust. it can be integrated with other Java frameworks on request.

Advantages

  • Enterprise app development is easy and robust
  • JSF is considered fast as compared to server side interfaces
  • There is plenty of component libraries to help you
  1. Spring MVC

Spring MVC is works on presentation layer and applicable on wide product range. When working with Spring MVC, you can use objects everywhere, there is need to implement any base class. It also allows flexible data binding. it is taken as strategic and flexible web platform for Java web apps.

  1. Wicket

Wicket is a light weight component for designing robust java apps. It is suitable for apps that require high end GUI interface. It quickly distinguish business and application layer for eat template editing. this is a component based mode where component has its own state and model. if developers wanted to make most of their resources then Wicket can be consider best web development framework available so far.

  1. Stripes

This framework allows interaction between complex data objects. it support data binding, data validation, and data conversion. It is generally used to manage large volume of data that is highly complex in nature and difficult to manage by experts. Once you have registered for this web framework then it does not need for any external configuration. We can say stripes offer easy and efficient solution of complex problems in a web tier. This is a compact web framework with few dependencies.

  1. Tapestry

This is an open source and object oriented framework for designing powerful Java apps. It is based on MVC i.e. Model – View – Controller method and allows quick implantation of apps. The framework is much focused on methods, queries and functions instead of queries and URLs. It is based on modular approach for web development where UI on web pages are combined with their corresponding Java classes.

  1. RIFE

In this framework, each small is focused and approached carefully. A single app is divided into different modules; each developer has its own task so that it can be completed successfully. Whenever it is needed, one module can be effortlessly integrated with other one that is called seamless integration of modules. In this way, it is easy for developers to manage code, code replication and redundancies can also be reduced significantly.

  1. SEAM

This is an open source web framework suitable for designing internet rich applications. It integrates different technologies together like AJAX, Business Process Management (BPM), JSF, Java beans etc. it also deals with contexts basics. Web development is easy with JBOSS tools and design issues are also eliminated to a large extent. Some of highlights of SEAM include – Emailing, PDF creation, graph designing, worksheet formation etc.

  1. Google Web toolkit

GWT is a web development framework that allows developers to maintain and build Java apps. it would be easy for you to implement Google maps and Gmail with Google web toolkit. There are plenty of tools that make web development easy for developers. There is also AJAX assistance that allows them to write applications quicker. You can also test, share or edit AJAZ apps whenever necessary.

  1. OpenXava

This is a web development framework for designing AJAX apps at enterprise level. It helps developer in designing full – fledged Java apps that ready to market. It allows easy report generation and module generation. This is much faster as compared to MVC, Ruby etc.

Can Outsourcing Java Services Be An Answer To Technology Concerning Doubts Of People?

81a9d241-8159-42aa-a67d-ca285372005f.jpgStop-pick-go – life can be so easy if one receives guidance for every right thing. Most business people expect the same from their analysts and experts who help them in making several important decisions. But somewhere in the technology world, companies are afraid of innovative solutions – why? May be they did not get the right partner to outsource solution. Outsourcing java can be an answer to their technology concerning doubts. Java is top level development platform that helps in creating innovative apps and keep you one step ahead.

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Java And Javascripts – Two Different Programming Languages For Developers

In case you met a novice java developer, you may find him struggling with a confusion that Java and JavaScripts are same- but we know the truth; that is both are programming languages used by developers for creating different applications.

java-vs-javascript

Java, a product of Sun Microsystems, is generally used by developers to program applications. Java code is executed within a virtual machine, which means a java app can be distributed without any worry about distinct architectures and OS on which app might run.

JavaScript, on another hand, is used as a scripting language. Developers use JavaScript only inside of web pages. It depends on the code how your web page will look and operate. For instance, if you use JavaScript for creating a drop down menu, it will expand when you move the cursor on it.

Both the languages, i.e. Java and JavaScript have different libraries. Java offers large standard library that is been standardized in the java standard. This empowers java developers to leverage widest range of tools while code writing. However, JavaScript’s library is pretty smaller and usually related to performing with HTML code inside the web page.

What’s next that create confusion about these two programming languages- the fact that developers can use Java in a web page as a java applet. It is a tiny part of the web page where you run java code and is showcase in the browser window. Java Developers generally use java applets for building highly advanced features in the browser, for instance a game. Whereas this can’t be expected from JavaScript as it is not powerful enough to intend a complex design for a game and thus, Java makes a clear win. The Java code will run the same regardless of browser type you use until you remove the Java plug-in from web browser. You can’t do the same with JavaScript as it is often implemented differently in the distinct web browsers and require several compatibility hacks.

Both Java and Javascript can be used as web languages, yet it is important for aspiring programmers to learn JavaScript. Due to slow speed, java is not used often by developers on the web. In short, Java and JavaScript are two different programming languages having different uses, but you cannot interchange them with each other. This must be clear as many java software development companies ask interviewees about Java and Javascript. If you want to join any of the companies as a java developer, do remember all the points we have discussed in this article.

Don’t forget to feedback this story! Comeback again for more java development related articles.

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How to use AWS Cloud watch? Explain the concept to make java application development process simpler

Aegis Java application development team is sharing this post with global developers and java development community to let them know about the concept of Cloud Watch and AWS. Experts have also discussed Architecture of Amazon Cloud Watch. To know further, read this article.

What is Cloudwatch?

Cloud was basically invented to separate the content from the device and storing it in central trusted servers thus enabling the users to access their data from any where and everywhere from any device. The Amazon Cloud (AWS) takes a leap further than just storing the data. As the concept of a Cloud evolved, things started drifting from just storing the data to storing entire application, to even sharing of computer resources like memory, hard disk, database. And hence came to birth the concept of Platform as a Service (PaaS), Application as a Service (AaaS) and SaaS (Software as a Service). This truly defines the cloud in the modern days. Hence in a layman language, the Cloud is watching you. But then who watches the Cloud?

The answer to this is CloudWatch. CloudWatch is another awesome service provided by AWS that helps to monitor the entire cloud for its different parameters such as memory usage, database usage, cpu utilization, etc. This helps the developer to analyze and monitor the performance of their application and the servers, the performance of the database and hence fine tune it in any way manner possible that will reduce the costs to run the application in the cloud. And also its just not about costs, sometimes the application needs to determine the performance of different services of AWS that it is using to draw out analytics and important conclusions from it. Cloudwatch can be accessed using many programming languages, the most prominent being Java. Java development being the strong part, the article will mainly focus on accessing cloudwatch using Java.

AWS and Cloudwatch?

Amazon Web Services (AWS) is a Cloud Service and it is one of the largest Cloud providers amongst all those who are available. AWS comes with a bunch of services, all of them catering to the cloud model, that allows any application to use the powerful advantages that the Cloud model suggests. Starting from sharing of the processing power, to the database, to the security system, to the sharing of computer hardware, it is one-stop-shop for any cloud requiring application. One of the most famous and widely used service is that of Cloudwatch: A cloud monitoring system.

The operations on Cloudwatch can either be performed using the AWS UI, AWS CLI (Command Line Interface), or the AWS SDK. The SDK comes for a variety of languages enabling a wide variety of developers to code the applications performing operations on the service. We shall be discussing the Java approach to the system, because the Java team in the company has had a long experience developing the applications using Cloudwatch to monitor the system. The per-requisites for operating in Java would be a JAVA SDK and Maven installed on the machine.

Some of the advantages of using Cloudwatch are as follows:

  • Monitor EC2 – Helps monitor the EC2 instances for its memory usage, network bandwidth usage, disk usage activity etc. Consists of Basi
  • Monitor Other AWS Resources – Monitor metrics on Amazon DynamoDB tables, Amazon EBS volumes, Amazon RDS DB instances and many of other services
  • Monitor Custom Metrics – It is possible to create custom metrics from our application or via the UI and have Cloudwatch monitor them for custom purposes
  • Monitor and Store Logs – It is possible to store the logs generated by cloudwatch and then monitor to analyze the performance of the application and its different components. This can help understand the system better and improve the deficiencies of the same.
  • Set Alarms – Cloudwatch provides a services to set alarms on the different metrics, such that when they are triggered, a notification is sent which helps in taking automated actions.
  • View Graphs and Statistics – The AWS UI can be used to view graphs and statistics of the different alarms and keep a check on how are they performing.

 How to use Amazon CloudWatch?

To use AWS Cloudwatch, or as a matter of fact, any of AWS Services, one must download the awssdk to use its features. In case of Maven usage, the following snippets of code are used to download the sdk. If Maven is not present, one can manually download the aws-java-sdk from the Internet.1 The versions can be changed to suit the needs.

Amazon CloudWatch Architecture

Before proceeding further it would be nice to understand some technical jargon associated with Cloudwatch. The architecture of Amazon Cloudwatch is as follows:

2

Amazon Cloudwacth is basically a repository for metrics. AWS resources adds metrics into the repository and the cloudwatch service provides statistics based on those metrics as depicted in the above figure.

  1. Metrics – A metric is the base concept of cloudwatch. It represents a set of data points ordered by time. The data points, either from other services in AWS or the custom ones, are meant to serve as a means of information when statistics are down about these data points. Metrics are region dependent i.e., a metric in one region is not available for another region.
  2. Namespaces – A container for a metric are namespaces. The namespaces are isolated from one other, which in turns means metrics in different namespaces from different applications are not mistakenly integrated into the same statistics.
  3. Dimensions – A metric is characterized by a set of specific characteristics and dimensions can be thought of categories for those characteristics. In specific terms, a Dimension is a key/value pair that helps uniquely identify a dimension.
  4. Time Stamps – Each metric has to be associated with a timestamp in cloudwatch. The range for the timestamp is up to 2 weeks in the past and up to 2 hours in the future. If the timestamp is not provided, the service creates a timestamp based on the time the data was received.
  5. Units – It represents the statistical unit of measure. Some of the common units supported by the service include Seconds, Bytes, Bits/second, Count/second.
  6. Statistics – Statistics represent the kind of information that one intends to receive from Cloudwatch. Some of the examples include Minimum, Maximum, Average, etc.
  7. Periods – A period is the duration associated with each Statistic. Although periods are expressed in seconds, the minimum granularity for a period is one minute. Accordingly, you specify period values as multiples of 60. For eg, minimum for a period of 360 seconds, maximum for a period of 60 seconds, etc.

Cloudwatch API:

Following are the most important Cloudwatch API calls that are used very frequently and are the ones that we have been using in our projects.

1. PutMetricAlarm: This is the API call that is used to create an alarm in an aws account in a particular region.

3The alarm created above is for Kinesis stream. It says, if more than 0 (Threshold) records are being put (Metric Name) into Kinesis (Namespace) stream (Dimension) for more (Comparison Operator) for more than 60 (Period x Evaluation Period) seconds, then trigger the Alarm.

One has to specify the region when creating the stream. AWS, with all of its services, is distributed in many different regions around the globe. The region is specified as follows:

4

The endpoint can be one of the many values as defined below:

5

  1. DescribeAlarms: This is the API call used to describe any/all of the alarms of Cloudwatch. It is used to describe the alarm in terms of what state the alarm is in, its last modified timestamp and so on.

6amazonCloudWatchClient is a variable that has been initialized as an establishment to AWS Cloudwatch

  1. DeleteAlarms: This is the API call used to delete the Alarms from the Cloudwatch

7amazonCloudWatchClient is a variable that has been initialized as an establishment to AWS Cloudwatch

8

  1. SetAlarmState: This is the API call used to set the state of the Alarm, for any reason, programmatically.

Aegis Java website application development team has shared the above post in order to acknowledge global java development community about Amazon CloudWatch and its architecture and use. You can leave your comments regarding this article and share your reviews with experts.

Reference Links:

http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/WhatIsCloudWatch.html

How To Benefit Out Of Mobile Responsive Java Application Development And Make It Big?

Java, one of the richly chained and powerful programming languages for software development in the enterprise level, can make reap you benefits when added with mobile responsive strategy and really make your business flourish.

With the world’s inmates watching their outer space through the fascinating smartphones, the need to fit into their space has doubled for websites in order to grab the attention of good amount of users.

Though the desktop-compatible web designs are cheaper, the need of the hour is to create more user-reachable designs which is only possible by creating mobile responsive applications so as to meet the requirements of 60% of web users.

The technology advancement is as challenging as its sophistication. Yes! It is of course pretty challenging to meet the requirements of people who make it to the web every now and then from their quirky smart devices. However, since java is a write it once and run it anywhere application, it can be easy play with it until it reaps success.mobile responsiveEspecially when it comes to websites that showcase a company’s services through online means to global clientele, the reaching out is extremely important as business boosters are the no of hits the website gets.

Write a java code and its performance is surprising. This is an undeniable fact. Java has already proven its consistency, reliability and efficiency in the software arena and now the only space it needs to be put in is in par with the mobile responsive means.

Benefits of combining java and the mobile responsive strategies is that java is as it is very much easy to develop, one time coding and promptly delivery application. Blending it with mobile responsive strategy will help website players to grab more visibility and relatively increased sales resulting in boost in the business.

With its exclusive security mapping and impressive delivery, java can make it big for companies, for java plus mobile friendly algorithm is a sure shot way to success. All you need to do is get an able developer. Java is an application that needs right hands to do right coding for perfect delivery. Once for all coding with best inputs will produce miraculous results.

Therefore, for java application development to make big for you, push it in with the mobile responsive strategy and your business will simply flourish.

How to Use Spring Batch and Connect It to Database in Java Development?

Implementing a batch process for managing gigabytes of data is no doubt a hectic job; however, Spring Batch assistance makes the job easier for Java developers and programmers. Spring Batch is a renowned module that has been intended to manage batch processing details for all kinds of files. You can start with Spring Batch by developing a simple importing job, which will import the products from CSV file and send them to the MySQL database and later explore the batch processing capabilities using one or multiple processors and helpful tasklets. At the end, you can have a quick overview of the resiliency tools in Spring Batch for retrying records, skipping records, and restarting batch jobs.

A batch processing system has to manage huge amounts of data, handle the individual records failure without breaking down the entire process, and manage pauses and restarts without re-doing of already done tasks.

Spring batch

Job of the Spring Batch system

The core processing of Spring Batch involves distinct steps-

  1. Reading
  2. Processing
  3. Writing

How to connect Spring Batch to a database?

spring batch connect to databaseSpring Batch maintains a tables set that is used to record the present or ongoing state of jobs and the processed records. In case a job needs to be restarted, with Spring Batch, it can continue from where it was paused.

Spring Batch can be connected to any database of your choice; however, we are using MYSQL. You can download the community version for free as it will meet your requirements. Once the set up is installed, you will need to develop a database and a user that has permissions to communicate with that database. You need to launch mysql from the command line, from MySQL’s bin directory and implement the following code-

create database spring_batch_example;
create user 'sbe'@'localhost' identified by 'sbe';
grant all on spring_batch_example.* to 'sbe'@'localhost';

The starting line develops a new database – spring_batch_example, this database will maintain your products. The second code line will develop a user- sbe with the password sbe. The end line allows sbe user to access spring_batch_example database.