Tag Archives: java developer career

Java Metering by Dropwizard Metrics

We saw how we can do the relaxing Java Metering using Shirt occasion audience in one of our previously content.

Here we are going to see how to use Dropwizard Analytics structure to do the metering of our relaxing source techniques. Dropwizard Analytics is using Shirt activities audience internal to accomplish this. They have offered awesome wrapper and plenty of plug-in to collect the efficiency of each source techniques without much attempt.

There are 3 actions engaged in-order to accomplish this.

Analytics reliance in Expert pom
Sign-up ‘MetricRegistry’ and ‘ConsoleReporter’ in our source configuration
Offer @Timed or @Metered annotation for source methods

Since we are going to use Analytics structure within Shirt (restful Java) structure, the second reliance is needed. If your relax support execution is NOT using Shirt structure, then you can neglect the ‘metrics-jersey2’ reliance. This will bring the essential collections in our program after the synchronize function.

Register ‘MetricRegistry’ and ‘ConsoleReporter’:

Both MetricRegistry and ConsoleReporter implementations are arriving from Analytics structure. They actually deliver the chance to catch the efficiency of our source techniques and release the aggregated lead to system as a study.

public class RestSkolApplication extends ResourceConfig {
private static final Logger logger = LogManager.getLogger(RestSkolApplication.class);
private Set<Class<?>> classes = new HashSet<Class<?>>();
public RestSkolApplication() {
private void initializeApplication() {
registerListeners(); // Register listeners
private void registerListeners() {
final MetricRegistry metricRegistry = new MetricRegistry();
register(new InstrumentedResourceMethodApplicationListener(metricRegistry));
.start(1, TimeUnit.MINUTES);
logger.info(“Console reporter is enabled successfully!”);

The system review will review the efficiency metrics for every moment. This period can be configurable. So modify the period centered on your need.

@Timed or @Metered annotation:

The last phase is to add either @Timed or @Metered annotation in the REST source techniques like below:

public class BookResource {
public Response getAllBooks() {
System.out.println(“Get all books resource is called”);
final List<Book> books = BookDataStore.getInstance().getBooks();
return Response.ok()
public Response getBook(@PathParam(“id”) String id) {
final Book book = BookDataStore.getInstance().getBook(id);
return Response.ok() // (Response code)
.entity(book) // (response value)

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Performance of Java vs C explained over here

Java is the formal development language of Android operating system and it is the foundation for many elements of the OS itself, plus it is found at the main of Android’s SDK. Java has a couple of exciting qualities that make it different to other development ‘languages’ like C.

First of all Java doesn’t (generally) gather to local device system code. Instead it gathers to medium difficulty terminology known as Java bytecode, the training set of the Java Virtual Machine (JVM). When the app is run on Android operating system it is implemented via the JVM which consequently operates the system code on the local CPU (ARM, MIPS, Intel).

Secondly, Java uses computerized storage control and as such utilizes a Garbage Collection (GC). The idea is that developers don’t need to bother with which storage needs to be released as the JVM will keep a record of what is required and once a area of storage is no longer being used the rubbish enthusiast will 100 % free it. The key advantage is enterprise run time storage leaking.

The C development terminology is the complete reverse to Java in these two aspects. First, C system code is collected to local device system code and doesn’t require the use of an online device for presentation. Second, it uses guide storage control and doesn’t have a rubbish enthusiast. In C, the developer is required to keep a record of the things that have been assigned and 100 % free them as and when necessary.

There are other variations between the two ‘languages’, however they have less of a positive change of the specific stages of efficiency. For example, Java is a product focused language, C is not. C is intensely dependent on suggestion mathematics, Java does not. And so on.


So while there are philosophical style variations between Java and C, there are also efficiency variations. The use of an online device contributes an additional part to Java that isn’t required for C. Although using an online device has its benefits such as high mobility (i.e. the same Java based Android operating system app can run on ARM and Apple gadgets without modification), Java system code operates more slowly than C system code because it has to go through the additional presentation level. There are technological innovation which have decreased this expense to the barest lowest (and we will look at those in a moment), however since Java applications aren’t collected to the local device system code of a device’s CPU then they will always be more slowly.

The other big aspect is the garbage collection. The problem is that rubbish selection needs time, plus it can run whenever you want. This means that a Java system which makes lots of short-term things (note that some types of Sequence functions can be bad for this) will often induce the rubbish enthusiast, which consequently will reduce the system

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Java’s risk got fixed within in one and a half year

In July 2013, protection company Security Research found a security risk in Java 7u25 by which an enemy could completely evade the Java sand pit. Oracle launched a spot in upgrade 7u40, but as Security Research declared a few months ago, the spot only resolved the evidence of idea, and a simple rule adjustment still reveals the risk. Moreover, following research has exposed that the weeknesses is even more serious than originally exposed. After the problem became public, Oracle launched a spot as part of 8u77.

The risk can be seen in the new representation collection, available since Java 7, and more specifically in the new MethodHandle classification used for dynamically obtaining and invoking methods. It is related to the way sessions packed by different ClassLoaders are handled. Understanding of the problem needs some basic knowledge ofthe way Java ClassLoaders work; since classification running is one of the least recognized elements of Java, we will start working on give an intro to this idea prior to describing the problem itself.

Java ClassLoaders

Java has the capacity to fill rule dynamically at playback from a variety of resources. The actual through a special type of sessions called ClassLoaders. A standard Java execution might offer several ClassLoaders to fill sessions from data system, a URL, or a zipped computer file, among others, but also provides designers the capability to create their own customized ClassLoaders to handle customized specifications. The regular way to have interaction with a ClassLoader is by contacting its loadClass(String) method, which will agree to the name of a classification, and either return the associated Class item if found, or toss a ClassNotFoundException otherwise. Every classification in a Java application is packed this way by one ClassLoader or another.

Different ClassLoaders can be linked to each other to form a structure by giving a father or mother ClassLoader. If no mother or father is allocated, parents ClassLoader is late to the one that packed this particular ClassLoader (ClassLoaders are sessions themselves, and therefore need to be packed by some ClassLoader). When a father or mother ClassLoader is present, the standard behavior of a ClassLoader is to try to assign the running of the asked for classification to its parent; only if parents (or some grandparent) cannot fill the course, will this ClassLoader attempt to fill the asked for classification itself. However, makers of customized loaders are not required to apply this standard behavior, and they could choose to apply a different one.

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A big flaw found in Java Annotations

Annotations were presented in Java 6 in 2006, and we all got thrilled. Such a great device to create rule shorter! No more Hibernate/Spring XML settings files! Just annotations, right there in the rule where we need them. No more marking connections, just a runtime-retained reflection-discoverable annotation! I was thrilled too. Moreover, I’ve created few free collections which use annotations intensely. Take jcabi-aspects, for example. However, I’m not thrilled any more. Moreover, I believe that annotations are a big error in Java style.

Long tale brief, there is one big issue with annotations — they motivate us to apply item performance outside of a product, which is against the very concept of encapsulation. The item is not strong any more, since its actions is not described entirely by its own techniques — some of its performance remains elsewhere.

java annotations

The category Guides has no concept how and who will provide a clear case of category DB into it. This will occur under the surface and outside of its management. The hypodermic injection will do it. It may look practical, but this mind-set causes a lot of harm to the whole rule platform. The management is missing (not upside down, but lost!). The item is not in cost any more. It can’t be careful for what’s occurring to it.

This content describes why Reliance Injection packing containers are a incorrect concept in the first place: Reliance Injection Containers are Code Polluters. Annotations generally cause us to create the packing containers and use them. We shift performance outside of our things and put it into packing containers, or somewhere else. That’s because we don’t want to copy the same rule over and over again, right? That’s appropriate, replication is bad, but ripping a product apart is a whole lot more intense. Way more intense. The same holds real about ORM (JPA/Hibernate), where annotations are being definitely used. Examine this informative content, it describes what is incorrect about ORM: ORM Is an Unpleasant Anti-Pattern. Annotations by themselves are not the key inspiration, but they help us and motivate us by ripping things apart and maintaining areas somewhere else. They are packing containers, classes, supervisors, remotes, etc.

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Java and Red hat

Sometimes, the best objectives just don’t exercise.

Such is the situation with Red Hat-sponsored Nodyn, an free attempt meant to slot the Node.js server-side JavaScript system to the Java Exclusive Device, providing Java’s wealthy set of pedaling to Node. The venture is no more in effective growth due to a failure for making the well-known JavaScript additions, npm, perform together with it, said Mícheál Ó Foghlú, CTO of Red Hat Cellular.

We took as far as we could go,” he said, including that without npm, it was hard Nodyn to obtain grip, as the third-party segments are crucial. “The npm JS segments don’t actually all function in that JVM atmosphere. So it causes it to be a bit challenging to develop up the group and the grip.”

Node and Java still can stay well together and return details via such systems as RESTful API phone calls, said Ó Foghlú, but Nodyn was never created into any items. Everyone is still able to play a role to the venture, even though it has not been continuing to move ahead. ” free, it’s still there but we’re not placing so much power in it. We’re placing more power into Node itself.” Red Hat functions as system vendors of the Node.js Base, which manages growth of system.

Red Hat is, however, still fascinated in the free Vert.x venture, which provides a JavaScript-to-JVM link, Ó Foghlú said. An solution to Node, Vert.x provides a tool set for programs on the JVM. “What that does is it delivers the Node design to some other ‘languages’,” he said. The Node design would function Node’s light and portable, non-blocking IO structure. Languages presented in Vert.x consist of JavaScript, Java, Cool, Dark red and Ceylon. With rule operating in the JVM, Vert.x allows use of JVM pedaling, Ó Foghlú said.

Acknowledging the popularity of combined surroundings, Red Hat looks to link Node.js and Java.

The company is using the Node program administrator to create connections connecting Node.js to ActiveMQ, the Java texting service, said Wealthy Sharples, mature home for product control at the Red Hat app systems business team.

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The existence of Java vulnerabilities is proved

More Microsoft windows customers are setting up areas, but the Oracle Java and The apple company QuickTime issues are even more intense than they were last season, according to Secunia reviews on the 2010 first one fourth. Individuals may think their PCs are protected because they are working Microsoft company windows Upgrade, but most are still at threat because of risk in third-party applications.

Secunia’s figures are based on Microsoft windows PCs working its free Personal Application Examiner, so they only signify a part of the market. Because PSI encourages individuals update insecure software, most non-PSI customers are probably in a more intense place.

In the January-March one fourth, 93.9 % of UK customers had repaired their Microsoft windows based pc, and 96.2 % had repaired other Microsoft software, such as Microsoft Office (PDF). However, 11.9 % still had unpatched third-party software. The figures for the USA were a little bit worse: 93.5 % had repaired the OS, 96.1 % had repaired other Microsoft software, and 12.7 % had unpatched third-party software

The significant issues are Apple’s QuickTime and iTunes, Oracle Java JRE, and Adobe Audience.

In the UK, for example, unpatched Java set ups risen from 36 to 41 % in contrast to the first one fourth of last season, and unpatched QuickTime set ups improved from 55 to 61 %. Luckily, for most customers, both applications can be removed without a important charge. (Adobe Innovative Package customers may have a QuickTime issue.)

Java is a long-running issue, but things may enhance. Oracle has been pressured by the US FTC to apologise for misleading customers about its protection up-dates, and it has been required to weblink to something that uninstalls old editions.

Adobe Audience is another long-running problem: it had 121 weaknesses, which is almost as many as The apple company iTunes (130). Unfortunately, more than 50 percent the Adobe Audience set ups were unpatched.

QuickTime for Microsoft windows is a increasing issue because The apple company has lastly given up on it. Unfortunately, many customers may have skipped the protection signals, eg from US-CERT.

In its full review, available free on demand, Secunia mentioned at Microsoft company offered 67 % of the Top 50 programs running on PCs but third-party programs experienced 79 % of the weaknesses. (The table below reveals the 20 most-commonly set up programs.)

In the Top 50 programs, areas were already available for 84.6 % of the weaknesses found, and there were 23 zero-day weaknesses, in comparison to 20 in 2014.

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Java is ahead of everything else

Rod Johnson has came back to JAX after eight a very extensive period of lack. A lot has occurred since 2008 and most of his forecasts have come real, apart from one: that OSGi was going to be an essential technological innovation.

“Java is doing just fine”

The designer of the Springtime structure decided with the results of the TIOBE catalog, which indicators the reputation of development ‘languages’, and opined that not only is Java no.1 in conditions of terminology reputation, but it has handled to get before everything else. “The condition of Java is really, really healthier,” Brown gushed.

The good purpose why Java is doing well, Brown said, is because it has tailored and now performs particularly well with bins. It brings in key components for microservices such as support finding and routine breakers, but there’s also been a efficiency cutting-edge in Java in the situation of Springtime Start.

The increase of microservices

Some of the key changes since 2008 were that the web browser stopped to be the main way in which individuals absorbed programs, the speed of modify multiplied and developer-oriented solutions such as GitHub increased. However, the most essential change is still growth of microservices because different customers have different needs, which modify at different prices. There are at least two explanation why microservices perform many in the IT field nowadays: first, because more compact solutions fit on contemporary components and second, because microservices fit how individuals want to operate —hence Amazon’s two-pizza group concept, namely that a group should be sufficient to be fed with two chicken wings.

“We stay in an era of terminology fragmentation”

We’re going to see more Java, but also a lot more non Java, the CEO of Atomist declared in his keynote. One of the most essential training that we discovered from Rod Brown was that contemporary programs are going to include more ‘languages’. For those who are asking themselves about the next Java, that may as well be Java.

Still, it’s possible that the next Java won’t be as big as Java because the era of prominent ‘languages’ is gone now. Consequently, designers will have to understand at least one other terminology —other than Java—, especially if it’s Scala or Instant.

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Is Java stuck up with mobile devices?

Over the last a few several weeks, as part of my Smart cellphone Success Analyze as a dyed-in-the-wool iPhone and iOS customer, I’ve been submerging myself in the world of Android operating program — particularly, low-cost Android operating program devices made mostly in Chinese suppliers.

I’m not an extensive newbie when it comes to Android operating program. Actually I used Android operating program for several years before providing up on it this year. I am also competent in the essential techniques structure of the OS itself and how it operates on various ARM-derived rubber styles.

One of the goals of my Success Analyze is to see if a lower-cost Android operating program cellphone can, in reality, substitute my much more costly iPhone 6S. Three several weeks into quality, I am progressively of the viewpoint that the response is yes.

I still have my issues with Android operating program cellphone components and the OS itself, but they are not deal-breaker issues in any respect. All of these eventually are resolvable, and in time the OEMs, Search engines and the Android operating program designer group at large will find methods to them.

But fixing some issues will need hard options. One of those may be an extensive essential re-architecture of the Android operating program OS itself, in order to cope with what I consider to be an important flaw: considerably greater source usage in comparison to iOS.

Android’s Achilles high heel, aside from the “toxic hellstew” of protection areas and fragmentation which is outside the opportunity of this post and my Success Analyze sequence — is Java.

Java, beyond being an object-oriented development terminology with a C-like format, is the main efficiency atmosphere within Android operating program itself that operates many of the applications and user-land procedures in the cellular OS.

The execution/runtime atmosphere for applications coded in Java is a Java Exclusive Device, or JVM. A JVM can run on any processing system. That’s one of its best features. You can run Java applications on any program that operates a suitable JVM, and regardless of whether they have the same program structure.

The structure can be Apple or AMD x86, it can be IBM POWER, it can be Oracle’s UltraSPARC. Or it can be one of the many variations of ARM-derived processor chips.

So the program operating the JVM could be a mainframe, a big metal UNIX program, an x86 server, a PC, a Mac, a smartphone, a product, or even a smartwatch or a microcontroller in an included program.

Java’s mobility variety is impressive: It machines from the most important techniques with large levels of storage and CPU to the actual, low-power processor chips that are extremely resource-constrained.

The only thing they need in typical is a JVM, and the rule is basically convenient between methods with minimal variations.

There are different kinds of JVMs, such as server-side (J2EE), Java Conventional Edition on PCs and Mac pcs (J2SE) and Java Small Edition (J2ME) which was once used on foolish cellular mobile phones and the traditional BlackBerry.

Each of these sorts of JVMs have different efficiency and source usage information because they are focused towards different kinds of techniques.

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JDK Array Sort

In this article, we will discuss one of the JDK 8 feature called parallelSort. Before getting into the details of parallel sort, we will see sort method implementation.

The sort method will use the “merge” sort algorithm or Tim Peters’s list sort algorithm to sort the elements. “Merge” sort will use divide and conquer methods to sort the elements. The lager array will be divided into two parts and then each part of the elements will be divided further until there are no possible way to divide. The individual chunks will be sorted based on an “insertion” sort algorithm and then the results will be merged. To sort the larger array, it will have performance problems.

To avoid this, in JDK 8 we have a new feature called “ParallelSort“. This method will make use of “Fork/Join” framework. This will make use of all available processing power(On multicore processors) to increase the performance. Fork/Join framework will distributes the tasks to worker threads available in the thread pool. The framework will use “work stealing” algorithm. The worker threads which doesn’t have work will steal the work from the busy worker threads.

The Arrays#parallelSort method will decide whether to sort the array in parallel or in serial. If the array size is less than or equal to 8192 or the processor has only one core, then it will use Dual-Pivot Quicksort algorithm. Otherwise, it will use parallel sort.

static void parallelSort(char[] a) {
int n = a.length, p, g;
(p = ForkJoinPool.getCommonPoolParallelism()) == 1)
DualPivotQuicksort.sort(a, 0, n - 1, null, 0, 0);
new ArraysParallelSortHelpers.FJChar.Sorter
(null, a, new char[n], 0, n, 0,
((g = n / (p << 2)) <= MIN_ARRAY_SORT_GRAN) ?
MIN_ARRAY_SORT_GRAN : g).invoke();

The sample demo code is given below.

class SampleArrayDemo {
* @param args
public static void main(String[] args) {
double[] arr = new double[10000001];
for (int index = 0; index < 10000000; index++) {
arr[index]= Math.random();
System.out.println("The starting time" +
System.out.println("The end time" +
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New APIs and Python, Java and software development kits

Reasoning support agency iLand has released a new API along with new growth packages for Python, Java, and Google Golang. The aim is to give program designers an alternative choice when handling cloud applications.

The API, along with Python, Java, and Golang application growth packages (SDKs), can offer DevOps, IT functions, and handled companies, “another vector of customisability and adaptability to customer interface with cloud on their own terms”, the organization said.

Is this the end of the API economy?

Is this the end of the API economy?

Does the unexpected closing of well-known APIs mean the end of the API boom? Or is it time for a move to a old and maintainable future

iLand is expecting that the APIs will help in its cloud facilities promotions, which run on its Business Reasoning Services-Advanced Protection (ECS-AS) system. According to the organization, these incorporate security, conformity, catastrophe restoration, back-up, tracking, and resource management with the aim of assisting cloud adopting.

The ECS system is part of iLand’s free Apache Cassandra information factory, which is the after sales that is designed to give brilliant management, automated, and confirming abilities.

The organization also has a “cloud console” so that allows customers to handle performance from one web-based customer interface, the organization said. iLand’s CTO Bieber Giardina, the organization is trying to help designers enhance the visibility of what they are doing.”As a person you want to be able to see what you are doing and why,” he informed ZDNet.

“Users want only one lite of cup. They want all of these different components and, especially their VMs, all working through that individual lite of cup,” and to do that, a lot of products need to work through the same APIs, Giardina said.

Recently the market has seen a mindset modify towards API, he said. Several decades back, “people did not discuss about them very much but now they view the significance and they want the right ones and the best ones”.

Giardina confirms. “A couple of decades back nobody was referring to them, now everybody is and they want the best.”

He also believes other parts are suffering from a identical trend. “Every three to 5 years the market has to go through this,” he said. “There will be the best concept and individuals discuss about it and then also try this comes along and requires over. We can see this occurring with DevOps. It’s the best concept and now many more individuals and then everybody will be doing it.”

iLand said preliminary uses for the API consist of DevOps and processes automated to help designers and techniques technicians can quickly rotate up exclusive devices or set up techniques using their current implementation resources, while functions groups can accessibility and creatively incorporate cloud information together with their other tracking resources in only one show or system functions middle.

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