310-065 exam Dumps Source : Sun Certified Programmer for the Java 2 Platform.SE 6.0
Test Code : 310-065
Test cognomen : Sun Certified Programmer for the Java 2 Platform.SE 6.0
Vendor cognomen : SUN
: 305 actual Questions
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KYOTO, Japan, Feb. 6, 2019 /PRNewswire/ -- wireless contraptions equipped with the novel international wireless communication specification Wi-solar FAN (field enviornment network) for the information superhighway of issues developed collectively via the research community of Professor Hiroshi Harada of the Graduate school of Informatics, Kyoto school (hereinafter Kyoto college), Nissin techniques Co., Ltd. (hereinafter Nissin systems), and ROHM Co., Ltd. (hereinafter ROHM) grew to subsist one of the most world's first options to obtain Wi-solar FAN certification.
BackgroundIn order to recognize outdoor communique networks such as sensible cities and judicious grids, notable, lengthy-distance and cozy community expertise is required. Wi-sun FAN is a brand novel specification of Wi-solar, a global radio communications project that's the optimum usurp to the development of IoTs. it is an interoperable communications networking manner for electrical energy, gas, and water metering, as well as for sensible cities and judicious grids in a lot of purposes corresponding to infrastructure and bright transport programs.
This Wi-sun FAN is an interoperable low-power IoT instant verbal exchange technology that utilizes low-energy instant transmission technology in line with the IEEE 802.15.4g accustomed and multistage routing technology in line with IPv6. On might furthermore 16, 2016, the Wi-sun Alliance, which certifies wireless conversation requisites for IoTs, technical compatibility, and interconnectivity, theme typical standards, and on November eleven, 2016, the three parties introduced that they succeeded in basic radio traits usurp with Wi-sun FAN. The Wi-sun Alliance then announced its Wi-sun FAN certification application on October three, 2018.
This achievementBased on the results of the fundamental structure of Wi-solar FAN, the three parties developed a radio suitable with Wi-sun FAN technical specifications and certification software, and handed an IP-primarily based certification verify the usage of multi-hop, frequency-hopping, and advanced certification security by using a plurality of part radios from distinctive corporations. This radio has privilege here features as described within the Wi-sun FAN Technical requisites.
p>With the IEEE802.15.4/4g/4e technologies in a position to capable transmission over 1km under the japanese legislation, this radio is fitted with a global universal for web access, which has been added in Wi-Fi (TM) techniques, and a multi-hop international accustomed that realizes multi-stage relay between radios in accordance with IP. This makes it effortless to connect sensors, meters, and displays that bear up smart cities and sensible metering to the cyber web.
This fulfillment become carried out within the Impulsing Paradigm exchange via Disruptive technologies software (affect) led by the Council for Science, expertise and Innovation, the cabinet workplace. This application became fashioned via a joint industry-academia consortium called the subsequent-generation Wi-solar Joint analysis Consortium, Kyoto. The three parties, primarily based in Kyoto, are Kyoto school, which occupy a song checklist of standardization and development of IEEE 802.15.4/4g/4e, Nissin programs, which commercializes Wi-solar-appropriate verbal exchange middleware, and ROHM, which develops conversation modules compatible with the average.
define of certification acquisition:Date and time of certification acquisition: January 30, 2019Certification authority: Wi-sun AllianceCertified checking out laboratory: Allion Labs, Inc.Certification number: WSA 0171
Future developmentIn the longer term, the three parties will participate in an interoperability specification verification event sponsored by means of the Wi-solar Alliance to bear contributions to testing for technical conformity and interoperability of the Wi-solar FAN commonplace, and to advertise extra construction as trade-academia cooperation tasks in Kyoto with a purpose to implement this radio in society. The outcomes had been furthermore displayed on the Wi-solar Alliance sales space in DistribuTECH 2019, the greatest vigour business-related adventure within the u.s., which become held in novel Orleans on February 5.
further particulars are available at:http://www.dco.cce.i.kyoto-u.ac.jp/en/PL/PL_2019_01.html
View common content material:http://www.prnewswire.com/information-releases/kyoto-institution-teaming-with-2-jap-businesses-acquires-world-first-certification-for-wireless-communication-specification-wi-solar-fan-300790447.html
supply Kyoto tuition; Nissin systems Co., Ltd.; ROHM Co., Ltd.
Copyright (C) 2019 PR Newswire. total rights reserved
ATLANTA, Oct. 1, 2018 /PRNewswire/ -- Landis+Gyr (SWISS: LAND.SW) introduced its assuage for the Wi-solar FAN Certification program launched by the Wi-solar Alliance previous nowadays. As a Promoter Member of the Wi-solar Alliance that holds a Board of administrators position, Landis+Gyr joins different member groups in advertising the implementation of open, necessities-based box belt network (FAN) and the web of things (IoT).
Utilities occupy utilized container enviornment networks to supply coverage for communicating assets akin to smart meters, sensors and automation gadgets throughout their carrier territory. With the increase in sensible city functions, habitual requirements for FAN connectivity will increase the choices accessible for purposes and gadgets in a position to subsist a portion of the community.
Wi-solar's FAN Certification program will give compliance testing of community accessories and contraptions to a communications profile developed from relevant open standards and certify the product's capacity to interoperate.
"Landis+Gyr strongly supports this certification endeavor for the future cost it is going to add for utility grid modernization and IoT programs," mentioned Marius Chilom, Senior vice chairman and Chief technology Officer of solutions for Landis+Gyr. "The enhanced the interoperability, the greater valuable these networks will subsist for the subsequent wave of sensible grid and judicious city applications."
"Certification ensures interoperability, which is vital to the boom of IoT innovation," pointed out Phil Beecher, President and CEO, Wi-sun Alliance. "we are blissful to formally launch the FAN Certification program and are excited for the first wave of FAN-certified products to subsist deployed into the market beginning Q1 2019."
The certification application will subsist confident utilities, cities and service suppliers occupy access to adaptable, multi-carrier networks that allows you to assuage subsist confident interoperability into the long run. other key merits for community operators include:
All Wi-solar certified products are fastidiously established by means of a Wi-sun appointed third-birthday party examine lab to ensure the contraptions toil collectively without hardship and securely for swift time to market. licensed instruments consist of a digital certificates to authenticate entry to a Wi-sun FAN, enormously decreasing vulnerability to cyber security threats. beneath a part settlement, Wi-sun Alliance has appointed GlobalSign because the third-birthday party service provider of digital certificates for the Wi-sun FAN certification software.
About Landis+GyrLandis+Gyr is the leading world company of built-in power management options for the utility sector. offering one of the crucial broadest portfolios of products and capabilities to tackle complicated trade challenges, the commerce grants finished solutions for the groundwork of a better grid, together with sensible metering, distribution network sensing and automation equipment, load handle, analytics and energy storage. Landis+Gyr operates in over 30 nations throughout five continents. With sales of approximately USD 1.7 billion, the commerce employs c. 6,000 individuals with the only mission of helping the world manage power more desirable. more assistance is purchasable at www.landisgyr.com.
about the Wi-sun AllianceThe Wi-sun Alliance is a global non-earnings member-based association made of industry leading agencies. Its mission is to drive the global proliferation of interoperable wireless options to subsist used in sensible cities, smart grids and other internet of things (IoT) purposes using open global requisites from organizations, similar to IEEE802, IETF, TIA, TTC and ETSI. With greater than a hundred and eighty participants global, membership of the Wi-sun Alliance is open to total commerce stakeholders and comprises silicon carriers, product companies, functions providers, utilities, universities, agencies and municipalities and endemic executive organizations.For greater counsel, tickle discuss with: www.wi-sun.org.
Wi-solar Alliance and the Wi-solar Alliance brand are trademarks of the Wi-sun Alliance.
View customary content:https://www.prnewswire.com/news-releases/landisgyr-helps-lead-wi-sun-alliances-fan-certification-application-for-significant-scale-iot-conversation-networks-300721548.html
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GlassFish, and its associated Technology Compatibility Kit (TCK) code, has been fully migrated to Eclipse Foundation stewardship. The novel release, Eclipse GlassFish 5.1.0, is now fully Java EE 8 certified, which represents a key step to ensuring backward compatibility of Jakarta EE.
GlassFish is the reference implementation of Java EE, in other words, the standard from which total other implementations and corresponding customizations are derived. GlassFish was initially created by Sun Microsystems for the Java EE platform and is now sponsored by Oracle, who occupy a supported version called Oracle GlassFish Server.
GlassFish supports Enterprise JavaBeans, JPA, JavaServer Faces, JMS, RMI, JavaServer Pages, and Servlets, meaning that developers can employ it to create enterprise applications that are portable and scalable, and that integrate with legacy technologies.
The conception of transferring Java EE sources to the Eclipse Foundation was announced at the 2017 Oracle JavaOne conference
The novel release, GlassFish 5.1, has been fully tested under both the open source TCK and proprietary Oracle Java EE 8 TCK. The Eclipse Foundation says that the completion of the novel version was a key accomplishment in allowing toil to inaugurate on the release of Jakarta EE 8. The Eclipse Foundation aims to occupy Eclipse GlassFish 5.2 subsist a Jakarta EE 8 compatible implementation, and the Foundation has gained the champion of total of the major vendors who occupy Java EE 8 compatible versions of their commercial products. The companies occupy total committed to ensuring their products are Jakarta EE 8 compatible as well.
The migration has been described as "an tremendous engineering and legal challenge". Java EE TCKs are open-sourced and hosted at the Eclipse Foundation. In addition, the Eclipse GlassFish code base was re-licensed from CDDL+GPL and Classpath to Eclipse Public License 2.0 plus GPL with the Classpath Exception.
The developers dispute this has been a massive amount of work. The Java EE source-code contains over 5.5 million lines of code and over 2.2 million lines of comments in more than 61,000 files. For comparison, it’s around the very as the server side of World of Warcraft and the Linux Kernel 2.6.0. The CTS/TCK contains over 4.6 million lines of code and over 1.1 million lines of comments in more than 34,000 files. It’s comparable with the codebase of Windows NT 3.1 and Photoshop CS6.
Java EE Is Renamed Jakarta EE
Java Guardians To The Rescue Of Java EE
Java EE 7 and Glassfish 4.0 at JavaOne
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A pair of patterns that could reason Java heap exhaustion were identified from years of research at IBM. One arresting scenario was observed when Java applications generated an excessive amount of finalizable objects whose classes had non-trivial Java finalizers.
What Is a Java Finalizer?A Java finalizer performs finalization tasks for an object. It's the opposite of a Java constructor, which creates and initializes an instance of a Java class. A Java finalizer can subsist used to effect postmortem cleanup tasks on an instance of a class or to release system resources such as file descriptors or network socket connections when an object is no longer needed and those resources occupy to subsist released for other objects. You don't requisite any argument or any recrudesce value for a finalizer. Unfortunately the current Java language specification does not define any finalizers for a Java class or interface when a class or interface is unloaded. Let's raise a closer study at finalize() manner of java.lang.Object that provides an instance method, finalize() for finalization:
protected void finalize() throws Throwable
When a Java object is no longer needed, the space occupied by the object is reputed to subsist recycled automatically by the Java garbage collector. This is one of the significant differences in Java and is not institute in most structural programming languages fancy C. If an instance of a class implements the finalize() method, its space cannot subsist recycled by the garbage collector in a timely fashion. Worst case, it may not subsist recycled at all.
Any instances of classes that implement the finalize() manner are often called finalizable objects. They will not subsist immediately reclaimed by the Java garbage collector when they are no longer referenced. Instead, the Java garbage collector appends the objects to a special queue for the finalization process. Usually it's performed by a special thread called a "Reference Handler" on some Java Virtual Machines. During this finalization process, the "Finalizer" thread will execute each finalize() manner of the objects. Only after successful completion of the finalize() manner will an object subsist handed over for Java garbage collection to glean its space reclaimed by "future" garbage collection. I did not dispute "current," which means at least two garbage collection cycles are required to reclaim the finalizable object. Sounds fancy it has some overhead? You got it. They requisite several shots to glean the space recycled.
Finalizer threads are not given maximum priorities on systems. If a "Finalizer" thread cannot sustain up with the rate at which higher priority threads reason finalizable objects to subsist queued, the finalizer queue will sustain growing and reason the Java heap to fill up. Eventually the Java heap will glean exhausted and a java.lang.OutOfMemoryError will subsist thrown.
A Java Virtual Machine will never invoke the finalize() manner more than once for any object. If there's any exception thrown by the finalize() method, the finalization of the object is halted.
You are free to finish virtually anything in the finalize() manner of your class. When you finish that, tickle finish not await the remembrance space occupied by each and every object to subsist reclaimed by the Java garbage collector when the object is no longer referenced or no longer needed. Why? It is not guaranteed that the finalize() manner will complete the execution in timely manner. Worst case, it may not subsist even invoked even when there are no more references to the object. That means it's not guaranteed that any objects that occupy a finalize() manner are garbage collected. That's a potential hazard from a remembrance management perspective and, needless to say, there is considerable overhead for queuing, dequeuing, running the finalize() method, and rescanning the object in the next garbage collection cycle.
If you want to hasten cleanup tasks on objects, admiration finalizers as a final swirl and implement your own cleanup method, which will subsist more predictable. It's very risky to reckon on finalizers for postmortem cleanup tasks, especially if your finalizable objects occupy references to endemic resources.
Hands-on undergo with Java FinalizerWe can easily simulate this scenario with a pair of test applications and raise a study at dumps and traces to observe what's happening inside of the Java heap and threads for hands-on experience.
Let's build a pair of Java classes to recreate typical scenarios.
In ObjectWYieldFinalizer, they can implement the manner finalize() with Thread.yield() so that finalize() cannot complete its execution (see Listing 1) (Listings 1-7 can subsist downloaded here.)
The Thread.yield() manner prevents the currently executing thread from running and allows other threads to execute. If the Finalizer thread calls this finalize() method, it will respite its execution.
In ObjectWExceptionFinalizer, the finalizer() manner immediately throws a java.lang.IndexOutOfBoundsException. If the Finalizer thread calls this finalize() method, the object finalization won't subsist completed because of the exception and there's no second casual to hasten the finalize() manner (see Listing 2).
In ObjectWEmptyFinalizer, they don't implement any code in the finalize() manner (see Listing 3). ObjectWOFinalizer doesn't occupy any finalize() manner (see Listing 4).
Let's hasten each of the classes to observe what happens. Sun's Java Virtual Machine (JVM) can subsist used with the following options for the class TestObjectWYieldFinalizer.
/sun1.6.0_10/bin/java -Xmx50m -verbosegc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC -XX:+HeapDumpOnOutOfMemoryError TestObjectWYieldFinalizer > verbosegc.txt
It looks very complicated. Why finish they requisite those command-line options? Well, without those options, they only glean a runt information about Java garbage collection activities fancy this:
[Full GC 50815K->45644K(50816K), 0.2276940 secs][Full GC 48780K->46415K(50816K), 0.2233279 secs][Full GC 49551K->49551K(50816K), 0.2396315 secs][Full GC 50815K->50815K(50816K), 0.1886312 secs][Full GC 50815K->49219K(50816K), 0.1964926 secs][Full GC 50815K->50815K(50816K), 0.1865343 secs][Full GC 50815K->50815K(50816K), 0.1836961 secs]
We only glean a character of garbage collection (Full GC), total Java heap usage before garbage collection (50,815K), total Java heap usage after garbage collection (45,644K), a tall watermark of total Java heap (50,816K), and time spent in the garbage collection (0.2276940 secs).
High watermark is the size of the current Java heap. The Java heap can expand its size up to a maximum size or condense to manage Java heap effectively.
The -XX:+PrintGCDetails option lets the JVM provide information on each generation in the Java heap.
We can observe Java heap usage and the time (in seconds) spent in Java garbage collection of each novel generation, tenured generation, and permanent generation with the -XX:+PrintGCDetails option in the following example:
[GC [DefNew: 3520K->3520K(3520K), 0.0001143 secs][Tenured: 43897K->47295K(47296K), 0.2110999 secs] 47417K->47415K(50816K), [Perm : 17K->17K(12288K)], 0.2115593 secs][Times: user=0.22 sys=0.00, real=0.22 secs]
In tenured generation, Java heap usage was 43,897KB before this Java garbage collection. Java heap usage reached 47,295KB after Java garbage collection; 47296K is the size of the tall watermark of the tenured generation; 0.2110999 second was spent to collect the tenured generation. Unfortunately they finish not observe the maximum size of each generation with the -XX:+PrintGCDetails option alone.
With -XX:+PrintGCTimeStamps, they can glean a timestamp for each garbage collection fancy this:
1.393: [GC 1002K->106K(5056K), 0.0001036 secs]
This garbage collection started 1.393 seconds after the JVM started.
The -XX:+PrintHeapAtGC option provides extensive information about each Java garbage collection (see Listing 5).
We can even observe the address scope of each generation. Unfortunately there's no timestamp for each garbage collection with -XX:+PrintHeapAtGC option alone.
The final option, -XX:-HeapDumpOnOutOfMemoryError allows the JVM to dump the Java heap to a file when an allocation from the Java heap cannot subsist satisfied or a java.lang.OutOfMemoryError is thrown. This option was introduced in Sun Java 1.4.2 update 12 and Sun Java 5.0 update 7.
If you want to experiment with IBM's Java Virtual Machine, total you requisite is a -verbosegc command-line option. You finish not requisite any of these: -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC, or -XX:+HeapDumpOnOutOfMemoryError.
Let's raise a study at what happened to the class while they talked about Sun JVM's command-line option. We've got java.lang.OutOfMemoryError from TestObjectWYieldFinalizer:
Exception in the thread "main" java.lang.OutOfMemoryError: Java heap spaceat java.lang.ref.Finalizer.register(Finalizer.java:72)at java.lang.Object.<init>(Object.java:20)at ObjectWYieldFinalizer.<init>(ObjectWYieldFinalizer.java:2)at TestObjectWYieldFinalizer.main(TestObjectWYieldFinalizer.java:11)
"java.lang.OutOfMemoryError: Java heap space." That means they got Java heap space exhaustion. The JVM could not allocate any more Java heap while running the manner java.lang.ref.Finalizer.register(), which is on line 72 of Finalizer.java. Finalizer.java? Of course, they did not write Finalizer.java. That's a portion of the JVM. They can furthermore check verbosegc.txt to which they redirected the garbage collection trail (see Listing 6).
About 3.711 seconds after the JVM started, they got java.lang.OutOfMemoryError. The Java heap dump is written to pid124.hprof.
Analysis of Java Garbage Collection TracesWe can employ a implement to resolve this trace. The IBM Pattern Modeling and Analysis implement for Java Garbage Collector (PMAT) is one of top five technologies at alphaWorks. I occupy implemented patented algorithms to forecast future failures related to Java heap exhaustion in this tool. tickle refer to United States Patent No. 7,475,214 if you are interested in the algorithms. Although they don't requisite these algorithms to investigate simple problem fancy this, you might subsist able to find situations where you could glean some insight from fortune tellers. They can glean a copy of the implement here.
PMAT parses verbose garbage collection (GC) trace, analyzes Java heap usage, and recommends possible solutions based on pattern modeling of Java heap usage.
The following features are included:
The implement can furthermore parse Sun's Java garbage collector traces, including the following:
We can start version 3.2 of the implement with a jar file in the download package. (V3.2 was the latest version when this article was written.)
# /usr/java5/bin/java -Xmx200m -jar ga32.jar
The implement provides a headless mode but let's bring up the graphical user interface mode for facile demonstration. They can click on the "N" icon to open Sun's trail file. They can click on "I" for IBM's trail file as seen in device 1.
We can observe in device 2 the analysis result and recommendation virtually instantly.
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Main Features:- Over 200 attribute Java 2 Platform.SE6.0 questions, covers total the SCJP exam topics- 'Mock Test' module, raise simulation tests as many times as you want, the size of each test can subsist adjusted- A running timer and visual progress bar assuage to monitor your test progress- capacity to reclaim any simulation test as you want and restore it entirely, resume exactly from where you left- capacity to expose the status of total the test records, worthy passage to expose your learning progress- capacity to delete a test record- Powerful test report. When you finish a test, the test report report will not only expose your score but enable you to review each question individually or review total the incorrect questions together- 'Self Study' module, free to pick any number of questions to study, you can practice questions and review answers at your own pace- In 'Self Study' module, study progress can subsist saved and resumed anytime anywhere you want- In 'Self Study' module, total incorrect answered questions are automatically selected for your later review- 'My frail Area' module is designed to assuage sustain track of questions that you find difficult so that you can target your frail areas. You can bookmark any question to 'My frail Area' module or remove it as you want.- capacity to generate randomly ordered test or study
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