Applet In Java - How It Helps In Programming?

Java Applet, a snippet code, is created by using the Java bytecode. This program is written in Java programming language. The bytecode is a kind of a programming that is exclusively utilized for Java programming. Whilst the Applet can run on a web browser with the help of tools like JVM or Java Virtual Machine, standalone ones, like, the Sun Applet viewer can also be employed to test this application. Although the Java programming language is generally used to write the applets but other languages can also be used for the purpose, such as, Jython. Once the program is completely compiled, it can easily run on most of the web browsers across various operating systems. So whether you use a Mac, Windows, UNIX or Linux systems, the applets will run hassle free.

Hibernate in Java and Its Features

As an open source persistence library, Hibernate Object Relational Mapping (ORM) is used widely by Java developers. The framework provided by Hibernate makes it easier for Java developers to map an object-oriented domain model to a traditional relational database. Thus, Hibernate in Java uses direct persistence-related database access to resolve problems related to object-relational impedance mismatch. It comes with high-level object handling functions to facilitate object-relational mapping.

Struts - In What Ways Does It Support Java Programming

Apache Software Foundation (ASF) has developers Struts as an open source web application development. The framework is being used widely by programmers to create Java EE internet applications. It enables web developers to create application by using model-view-controller (MVC) architecture by adopting and extending the Java Servlet API. The Java programmers also have option to use WebWork, a framework spun from Struts. Despite retaining the original architecture of Struts, WebWork comes with several enhancements and refinements. Thus, the Java programmers can rely on Struts to create large and complex enterprise application by keeping the model separate from view and controller.

Hibernate in Java - What Should Developers Know?

As the name suggests, Hibernate Object-Relational Mapping or ORM is an object-relational mapping library that is used in Java. The library provides a framework that helps in mapping object-oriented models of domains. The main objective of Hibernate is to solve the object-oriented impedance issues through the process of replacing the direct persistence-related accesses of database with functions that are involved in high-end object handling.

The primary feature that Hibernate comes up with is a unique mapping ability from various classes that are used in Java to the database tables and the same from Java data types to the SQL data types. The library also provides a string of retrieval facilities as well as a high end data query that facilitates handling the backend features. It also generates SQL calls, while making the lives of the developers easier, by automating set handling as well as object conversion. Besides, applications that use Hibernate also support SQL database with hardly any performance overhead.

What is the Future of Java Web Development?

As a concurrent and powerful programming language, Java enables developers to run their code on multiple platforms without recompilation. Java is currently reported to be used by over nine million developers to client-server web application development. While releasing Java 8 officially, Oracle called it as “the Most Significant Upgrade to the Java Programming Model Ever.” Oracle even delayed the release of the most anticipated version of the programming language to make it meet the ongoing and upcoming trends in web application development. The new features will definitely contribute towards increasing the increasing the popularity and market share of Java in the future.

Key Java 8 Features Web Developers were Looking for

Lambdas

Lambdas or closures are the most prominent feature of Java 8. The programmers can use lambdas to treat functionality as a method argument, treat code as data, and accomplish certain task by using concepts they are familiar with. Oracle has further designed lambdas after detailed discussion with the community of developers. Lambdas can be simply represented as a list of parameter separated using commas. However, developers have emerged the concept of functional interface by making existing functionality of the programming language lambda-friendly.

Extended Interface Declarations
The updates version of Java further uses default and static methods to extend the interface declarations. Despite making interfaces similar to traits, default method helps developers in accomplishing a different goal. They can use the method to add new methods to an existing interface without affecting the code’s binary compatibility with over versions of the interface. On the other hand, the abstract method can be user to accomplish these tasks without being implemented. As the default implementation needs to be provided by each interface, the implementers can inherit it by default.

StampedLocks
Often developers find it daunting to write multi-threaded code. They also have to use complex idioms to the core Java libraries to access the required resources by reducing the thread wait. Java 8 comes with StampedLock, a new and improved ReadWriteLock that works more quickly. However, the new ReadWriteLock is complex, and the programmers have to put some efforts to implement the concept properly.

Process Termination
When a web application has to launch an external process, its performance will be affected hugely when the process hangs, crashes or consumes 100% CPU. The developers have to debug the web application again to make it run smoothly. But Java 8 comes with the Process class that allows developers to manage these unruly processes smoothly by using the isAlive() and destroyForcibly() methods. The isAlive() method can be used to check if the external process is still alive, whereas the destroyForcibly() method will kill the timed-out process forcibly.

Controlling OS Processes
The JNI calls make it easier for developers to launch OS process from within the code. But there are always chances that the OS process may fetch unexpected results or affect the functionality of the internet application. Once a process is launched within the Java code, it tends to dangle. Java 8 enables developers to control the OS processes launched within the code efficiently by using three new methods. Along with checking if the process is alive and killing a process forcibly, the programmers can further use the method to specific amount of time they want the web application to wait for the process to be completed.

Repeating Annotations
Java 8 allows programmers to use annotation in any context. Now they have option to use annotations for almost everything in their code including generic types, local variables, super classes, interface implementation, parameter declaration, and declaration of method’s exceptions. The extended usage of annotation makes Java 8 friendlier for instrumentation tools and static analysis. However, the programmers have to decide when to use annotations according to the nature and needs of the code.

There are also a number of features that make Java 8 a powerful programming language for web application development. Some of these Java 8 features will further make it easier for developers to build large and complex internet applications within a stipulated time frame.

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Java Application Development For e-Commerce - A Good Option

An elegant looking well designed site is surely the mainstay of any online marketing business. If properly created, designed, and maintained, a website can very much turn into a digital storefront and a platform which can be used by customers as well as clients when it comes to directly communicating with each other.

More so, when we speak about development of eCommerce online shopping solutions, Java web application is the best. It has become an extremely popular fad as it makes this new type of shopping much easier, hassle-free as well as much quicker. You will find a lot of highly popular internet based shopping sites and all these platforms are astoundingly easy-to-use, functional, and at the same time, very much scalable irrespective of any environment. All these qualities make these sites so much popular to people of any age group. This popularity can very well be attributed to the most critical as well as essential parts played by Java App Development (JAD).

In fact, JAD is surely one of the most recent technologies that have entered the virtual world. This language is specifically designed to bring an altogether new as well as fresh perspective to the concept of online shopping. It is highly secure, flexible, accessible, usable, as well as portable. All these qualities have highly influenced the world of internet in more than a way, including giving the concept of online shopping a significant shot in its arms.

Thanks to JAD, a string of big transactions, involving even exorbitant amounts of money are now possible online. It also helps the online shopping sites to become strong, attractive, efficient and at the same time, competitive to survive the cut throat competition prevailing in the market.

The most significant feature of Java Application is that it gives the users the option of making online payment in an absolutely safe as well as secured way. The payment gateways are user-friendly and are encrypted in such a way that they are able to keep issues of forgery or unauthorized access to customer accounts at distant bay. This naturally boosts the confidence of the users by many folds. In fact, such has been the efficacy of Java that it has become a buzzword in the world of online transactions as well as eCommerce much due to its salient features and unique capabilities.

Thanks to the Java Virtual Machine or JVM, Java apps now have a remarkable and a prominent presence on the servers as well as on the client side, as it is installed in the most of the browsers by default. As it does not depend upon the platform that is being used, it is possible to run Java apps irrespective of the place and time. That means the users can go for internet based shopping from anywhere in the world, any time.

The mainstay of Java apps is its portability. The popularity that development of Java apps enjoys all over the world is due to the fact that it is basically a language that is highly object-oriented. This makes sure that the programmers have the option of creating its various modules, which can be used repeatedly. This in turn saves a lot of money along with time. Naturally, this is only increasing the importance of Java developers with every passing day.

Plenty of developers are being hired by various software developing companies all over the world in order to live up to the expectations of the clients and today, Java app development is indeed one of the most promising, lucrative and major options for aspiring software developers. This also indirectly helps in the creation of employment all over the world.

Through JAD or Java Apps Development, it is possible to explain strong and robust security, much due to the interpreter and the compiler that the language comes up with. These applications play a pivotal role in influencing businessmen; thereby using internet based shopping cart portals that come up with secured online payments along with transaction modes.

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Some of the biggest myths about Java

Java’s first version was launched in 1995 and since then several versions have been launched after fixing bugs as well as making improvements. Despite, being in the industry for such a long time, there are a lot of myths associated with Java since there are many people who will believe exactly what they want to believe, ignoring all better judgement. There have been much speculations, discussions as well as arguments related to various aspects of Java. This article aims to bust a few common myths that are associated with this language in the minds of people.

It is slow- A few people feel that this is slow in the start-up times, especially when compared with C++ or simple PHP applications. The applications may take some time for loading but the same can be said for .NET or other such big libraries. However, the latest Java update ensures that the loading time is much faster in comparison to the previous models. There is no point in comparing it to other programs as each has its own individual set of problems associated. C++ is the fastest but Java can be said to be faster than many other languages.

It is dead- This is said by a few since it has been in the industry for almost two decades and its last major release had been quite some time back. However, it is not fair to assume that it is dead just because of that since similar instances of no major releases can be found in C++ or Microsoft Windows. Other languages may evolve quite fast but you must remember that these languages are quite new, so they need much polishing to be done. Some people also cite that the language’s popularity is slipping through some indexes or statistics. But if investigated properly then it may be seen that these surveys are actually incomplete. They do not show the full truth, just investigate a few parameters.

Your hard drive may be read and files deleted by applets- The truth is that when applets attempt to access any local file, then a SecurityException will be thrown. The applets will crash if it is uncaught but without any file access occurring. Digitally signed applets that are granted with additional privileges, is the sole exception to this. A dialog box will be displayed by your browser to ask whether the applet author’s identity is accepted or not. If unsure it is best to choose no, to be safe.

Applets cannot be relied upon as differences in Internet Explorer and Netscape does not make writing stable applets a stable proposition- Different JVMs, various versions and kinds of browsers result in the varying behaviours of running applets. The users as well as developers may find the differences frustrating but the best solution for this is using single JVM to use across all browsers. This can be achieved by virtue of Java Plug-in which can bypass the JVM of browser to use its own, resulting in uniform performance.

Web browser is a must-have as Java cannot run without it- There are several forms of the code. Users are mostly familiar with applet running inside web browsers. But it is very simple to run Java application like normal programs. All you have to do is install JVM from some vendor to run the programs. A web server often runs Java servlets which may be termed as replacements for ASP or Active Server Pages as well CGI scripts. These are quite fast in fact and more efficient that CGI scripts.

Many people do not realize it, but there is a lot of potential in the language. There is more to the software than just applets. They are quite secure and hard drive will not be deleted. In case of any problem, installing plug-ins will help you solve them.

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Top Pros and Cons of Java development Platform

No one can deny the contribution of Java toward transforming the web. With thousands of websites and web application running on Java platform, it has remained popular over many years. But the popularity of Java is impacted by the emergence of new web application development platforms and tools. Despite offering loads of advantages, the platform also suffers from several limitations. But a developer still has several options to reap the rich features and benefits of the language by overcoming the lacunas.

According to a report related to annual largest Java developer conference posted on Ixonos.com, “Despite challenges Java still has a strong position as an enterprise software development platform. It has potential to grow as a viable ecosystem and technical platform also in the future. Oracle has been taking decisive steps to move the platform forward. But it’s not just Oracle’s Java: a lot of organizations and individuals have invested in the platform more collaboratively than before.”

As a new generation developer has options to choose from several application development frameworks, he can easily evaluate the pros and cons of each platform. It is also important to choose a development platform that completely complements the nature and requirements of the project. So a programmer can always compare the pros and cons of Java as a development platform to take the right decision.

Advantages of Java as a Development Platform

Open Source: Unlike other web application development platforms, Java is open source and free. So a company can easily use the technology without paying any licensing fees. With companies frequently exploring option to reduce project costs, Java has been popular among them for a long time. Also, many companies will continue to use Java as they have already invested in the technology.

Cross Browser Compatible: Developers often decide a web application development platform by keeping in mind the latest trends in technologies. Many companies opt for cross platform technologies to easily target users regardless of their choice of operating system and web browser. As a cross platform technology Java uses Java Virtual Machine (JVM) to translate the original code into byte codes, and then compile it to machine level languages based on the operating system. The feature makes it easier for programmers to build application to target major operating systems and browsers.

Easy to Develop Complex Applications: The frequent changes in user demands have made it essential for companies to launch applications that are both dynamic and powerful. Also, each application has to be complex to meet the varying needs of individual users. As an object oriented language, Java allows users to build complex applications without putting any extra time and effort. The stack and array classes help them in building rapid prototypes, whereas the garbage collection enable programmers to avoid using any interpreters. The features further make it easier to develop complex application without writing lengthy code.

Easy to Learn: The programmers familiar with any C based language can easily learn the Java syntax. Also, the beginners can learn Java from the scratch within a very short span of time. The large and standard class library provided by the platform is also well written. So a programmer can always refer to the documentation to use the Java class libraries.

Option to Reuse Code and Third-Party Libraries: Each developer wants to build a powerful application without writing longer lines of code. As Java web development is widely used by programmers across the world, one can easily access a large collection of code and third-party libraries. Further, the comprehensive documentation available on the web will help programmers in understanding how to use IDEs. Also, a developer can choose from several IDEs to meet the application’s specific requirements.

Limitation of Java as a Development Platform

Support for Limited Programming Languages: As a development platform, Java supports additional programming languages like JRuby and Groovy. But the platform does not users to avail the advantages of these languages to build innovative services. Most developers still use the programming language support extended by Java to create conventional services. Despite allowing developers to invent new programming languages, the underlying platform makes it difficult for them to implement the new language features.

Pre-Ajax User Interfaces: The use of AJAX has transformed the way web applications were being developed. But most Java frameworks are not designed with full AJAX support. For example, commonly used frameworks like JavaDX, Swing and JSF are not the best option to build AJAX user interfaces. So developers look for more innovative and advanced frameworks that allow them to seamlessly incorporate AJAX in the applications.

Complex Frameworks: A number of web application development platforms have made programming simpler and faster. Many developers are using tools like WaveMaker and Microsoft Lightswitch to easily develop enterprise applications. Also, as Java is based on C++, many programmers consider it to be too complex to build enterprise business applications.

Many developers are waiting for the commercial release of Java 8 to avail a number of advantages like lambda functions. The existing features and functionalities provided by Java as a development platform are considered old-fashioned by many programmers. So Oracle has to release Java 8 with more innovative features to make it popular among the new generation of web application developers.

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A Guide to Efficient and Faster Java debugging

Debugging is one skill that every java developer must possess. The reason behind such a crucial need is simple; the skill helps you to discover delicate bugs, which otherwise becomes invisible during the time of reviewing the code. The debugging skill becomes even more essential if your work tends to revolve around electronic trading system or high frequency project where the fixing time of a bug tends to be very low. Moreover, the bug tends to appear on production environment and be invisible in a machine featuring windows XP.

In some cases, it also helps understanding the flow of the java program. Now, when it comes to debugging, tools like Netbeans and Eclipse IDE come of great help. These tools are known to offer several breakpoints through the process and provide a great support to Java debugging. To start the complete process of debugging, all you need to do is configure the project in a modern IDE like Netbeans or Eclipse. Usually, Eclipse tends to offer better debugging opportunities as it allows an effortless integration with remote debugging.

Top Java Debugging Tips

Here is a quick look at some of the top and essential debugging tips using Eclipse that is sure to help you in java web development:

1. Make use of conditional breakpoint: Eclipse enables you to establish a conditional breakpoint, which allows you to debug a particular java program. The particular idea refers to a call for a breakpoint under condition wherein your thread will only discontinue at a particular line, provided the condition tends to match, as against stopping anywhere on that particular line due to line breakpoint. To establish the feature of conditional breakpoint, all you need to do is click twice on the particular line of breakpoint followed by a right click to properties and insertion of the condition. The program will only discontinue temporarily at the breakpoint without any hitch.

2. Make use of exception breakpoint: It is likely for you to experience bouts of frustration with the NullPointerException clueless about the source of origin. Exception breakpoint is precisely established to fight the odds of such situations. The setup can be easily done from the breakpoint window stopping your program. The Exception breakpoint can be established on exceptions of Java like ArrayIndexOutOfBoundException and NullPointerException.

3. Step Into, Step Over: These are referred to as wonderful options of debugging that are easily available in any kind of Java IDE. This particular approach comes useful in cases you need to debug multi-threaded application and direct a systematic navigation.

4. Incorporating watch point: This particular facility stops a program execution enabling a debug of the same, especially after a selected attribute has been modified or accessed. All you need to do is choose a variable in the Outline view and direct to the toggle Watchpoint from the context menu. This particular approach helps creating a watch point for the particular attribute listing it in Breakpoints view.

5. Make use of inspect and watch: These two options in the menu allow noting the expression value during the debugging process of the Java program. The process involves choosing the statement followed by a right click and navigating towards the inspect option to get the statement value during the time of debugging. You can also consider adding a watch to the process so as to make the value appear at the watch window.

6. Suspend and continue thread: You can suspend any thread and continue with the same again during the debugging process of a java program from the debug window. To make it work, you need to right click on any particular thread and select the choice of resume or suspend. This helps in cases like initiating a debug of multi-threaded program.

7. Make use of logical structure: The option of logical structure comes quite useful for monitoring contents within Java collection classes during the debug process. This help exhibiting the contents in key and hashmap value as against exhibiting complete hashmap details. This can be enabled from the variables window.

8. Incorporate Step filtering: The control of the program tends to transport from one class to the other class and finally end in classes of JDK like String or Sytem, especially when the Step Into is incorporated during the debugging process. Step filtering comes extremely helpful in cases when one needs to stay in an application without navigating into the classes of JDK system. This helps filtering out the class of JDK from Step into. This can be established from the preferences àJavaàDebugàStep filtering followed by easy disabling and enabling from the debug window.

9. Use Copy Stack option: If you wish to copy a particular stack of thread that had hit the breakpoint and has been suspended, the Copy Stack option comes of great help. The process involves right clicking on the particular thread on the window of debug and selecting the option of ‘copy stack’.

Some Important Shortcuts to Java Debugging

• F5 – The key to Step Into, which allows a move to next step.
• F6 – The key to Step Over, which allows a move of the control to the next line.
• F7 – The key to Step Return, which when executed from within a method allows a move of the control to the calling line from the place of origin of the current method.
• F8 – The key to move towards the next breakpoint.

Debugging a java program has become easier and efficient with the introduction of wonderful tools like Netbeans and Eclipse and is definitely worth a try.

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10 Critical Causes for Java EE Enterprise Performance Setbacks

During the design and implementation of technologies related to Java EE, performance problems tend to be one of the most crucial challenges. The most common problems faced while providing Java development services are usually faced while implementing large or lightweight IT environments, which generally incorporate a plethora of distributed systems from ordering applications and Web portals to ESB or Enterprise Service Bus, Mainframe storage systems and data warehouse. Let us discuss here the 10 most critical causes of performance problems related to Java EE and see how we can deal with them.

1. Improper capacity planning

Once a capacity planning process is properly implemented, it keeps track of the current IT production stability and capacity and also ensures deployment of new projects with minimal risk with the existing production environment. Capacity planning is often the most happening process problem leading to long and short term performance issues. Some problems that may arise are: post deployment, a new middleware system of Java EE fails to handle the expected volume or an application after deployment poses an overload for the current Native Heap or Java Heap space.

To avoid these problems, load and performance testing should be done effectively for determination of order volumes or number of concurrent users and exposure of the bottlenecks, thereby making room for corrective actions. Several existing technologies help in achieving these goals.

2. Lack of adequate middleware environment specifications for Java EE

Lack of proper decisions at the start of a new platform can cause stability problems leading to enhanced costs. Therefore, it is necessary to spend considerable time for brainstorming on necessary middleware specifications related to Java EE.

It is highly recommended that project team should spend quality time over the creation of a proper operation model catering to the Java EE production environment. Moreover, 64-bit JVM should be chosen over a 32-bit JVM as and when required, and the same should be combined with proper performance testing and capacity planning.

3. Unnecessary garbage collection for Java VM

When the JVM GC collectors perform an unnecessary number of minor or major collections in a short span of time, it leads to high pause time and degradation of performance. Possible causes might be small size of Java Heap, unsuitable JVM GC policy, amongst others.

Properly analyzing the JVM related data (CPU correlation, GC frequency, etc) enables one to determine whether there is a problem or not. It is also advisable to closely comprehend and monitor the JVM garbage collection process.

4. Poor or excessive synchronization with external systems

Java EE performance problems can also be due to greatly distributed systems, wherein a middleware domain usually delegates certain business processes like order management, customer profile and product qualification, to other middleware platforms of Java EE by means of diverse communication protocols and payload types. In such cases, it is significant to shield the middleware and applications through appropriate utilization of timeouts.

5. Improper database SQL capacity planning and tuning

Java EE enterprise systems are mostly dependable upon relational databases for a range of business processes from order provisioning systems to portal content management. A robust database environment ensures a scalable IT environment that renders effective support to the client’s growing needs. The most common problems are long-running, isolated SQLs, row or table level data lock and abrupt change in execution plan.

SQL level problems need to be identified and the database environment should be fine-tuned in order to ensure effective capacity planning involving performance and load testing.

6. Application oriented performance problems

The common problems in this category are inadequate communication API timeouts, thread safe code problems, issues related to relational, JDBC or I/O API resource management, excessive or improper data caching and excessive logging.

To overcome the application oriented problems, code reviews should be a significant component of the regular development lifecycle in addition to the release management process. This enables the pinpointing of primary implementation issues before the testing or implementation phases.

7. Tuning problems related to Java EE middleware

The specification of Java EE middleware might be sufficient but there may be absence of proper tuning. A large number of the Java EE containers available nowadays provide manifold tuning scopes depending on the business process and application needs.

Lack of proper tuning can set the Java EE container in a state that is non-optimal. Therefore it is advisable to go for vendor recommendation related to implementation of appropriate Java EE middleware.

8. Lack of sufficient proactive monitoring

Lack of monitoring can pose a hindrance in understanding the Java EE health situation and platform capacity. Ultimately the environment may tend towards a breakpoint, exposing several problems and gaps. Hence it is good to enhance the existing environment through end-to-end review and monitoring.

9. Hardware saturation on common infrastructure

This problem is mostly visible when deployment of a number of JVM processes and Java EE middleware environments are carried out on the existing hardware. It kills the application’s performance. A common solution is hardware virtualization which results in reduced data center size, fast implementation, reduced costs and so on.

10. Problems related to network latency

Major network problems like DNS server, switch and router failures may happen now and then but the mostly common ones originate from intermittent network latency. Tuning strategies like data caching, XML data compression and JDBC row data "prefetch" may reduce network latency.

It is indeed important for Java EE developers and IT architects to thoroughly comprehend their clients’ environments and make sure that the advised solutions cater to the growing needs of businesses as well as ensure a reliable, scalable and productive IT environment for a long time. The performance problems that disrupt client’s business should be minimized to prevent loss of revenue.

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