HCL

Hi friends, this is arun..after seeing my previous post lot of people called me and asked me how to crack interview as experienced java developer. few tips note down it, tell about yourself with start your name and end with your roles and responsibility in previous project which you have worked in previous company. exmy self a arun kumar basically i am from odisha, i have completed bca in 2013,after completion of my studies i started my carrier by working in infogrid technology that is there in banglore. in this organization i am working as a java developer. i have been working in this organisation since 3.4 years in one project named as AGD. AGD stands for all goods details .its a erp domain project and our client for this project from Europe. the main objective of this project is a user can interact with suppliers through online. user can get the status through online by mail about transpored product and availability. user check and view about historical data and user can generate his own reports.this application is acts as a mediator between user and suplliers. to implement this project we have been following agile mathodology.we are developing code and transfer to tester. afer completion of testing we deploy into live environment then another sprint wil be released by our scrum master. again we follow same. each sprint we takes around 15 to 20 days.and we conduct daily one meeting roughly around 15 minutes about. in this duration we talk about what we have done yesterday what problem we faced and what we are going to do next. in this project my roles and responsibilities are implementing dao by using hibernate developing modules by following spring mvc. testing web serviece by using saop ui. generate wsdl, creat wsdl. debug the code and fixing bugs. adding jars in pom.xml. to make application to get better performation developing code by following several design pattern like singleton, factory pattern, templet, abstarct factory pattern etc. implementing bussiness logics,analys bussiness requirement. these are my roles and responsibilities in this projects then the interviewer will start asking queations from core java to frameworks. important topics in core java 1 strings 2oops 3collections include concurrent collections 4multi threading 5 several logical programs like, reversing, sorting, etc hibernate 1 difference between get and load 3 difference between merge and saveOrUpate 4 caching 5 mappings one to many,many to one many to many 5 why sessionfactory is threadsafe spring 1 why dependency injection came into the picture 2 what is ioc 3 what are the scopes 4 what is defference between beanfactory container and application container 5 flow of spring mvc 6 what are the view resolver

7 what is aop 8 what are the autowire modes 9 how to integrate with hibernate with spring, some times they ask you to write down xml file web services what is rest what is deffernce between soap and rest, what are annotations in rest and their works what is advantage from soap and disadvantage of soap . friends these are commonly asked questions in regular interview. instead of by chosing these question it is far better to learn in depth. but i am sure no quetions can come out of nataraz sir's meterial. and one.more thing when your going to interview dont go with heavy make up. just go how your going daily to class just go in cool mind. if you dont know any answer at all. say in positively i dont know but if you give me a chance i will learn. but sure when your going to attend intervie make sure that remember nataraz sir classes. and go in cool mind. ALL THE BEST GUYS Today's CTS interview question Technical Round:= = = = = = = = = = = = = *Core-java ************ 1 .Tell me the internal flow of Set implementation class with one example ans:-Set Internally use Map so it doesn't allow duplicate Map m=new HashMap(); so whatever object u passed in set.add() method it will place in Map as a key as per above. 2 . In HashMap if hashing collision occure then how to resolve it. ans:-Hashing collision means if in collection if multiple object having same hashCode() then it will definatly placed in same bucket so to resolve this one we need to override equlas() method it will check content wise if object are content wise same then override the value.else just place in same bucket 3 . can we add duplicate in set and map if yes why write one code ans: yes, we can add if u don't override equlas() and hashCode() then duplicate will be allow in set and map also coz there is no element for comparing thats the reason duplicate are allow.. class Employee{ int id; String name; public Employee(int id,String name){ this.id=id; this.name=name; } @Override //toString() method here public static void main(String[] args){ Set s=new Set(); s.add(new Employee(10,"Basant")); s.add(new Employee(10,"Basant")); sop(s); } }

4 . Read data from file find the duplicate word and count them and sort them in desending order public class ReadFileAndCount { Map wordMap = null; String line = null; public Map counter(String fileName) throws IOException { wordMap = new HashMap(); try (BufferedReader br = new BufferedReader(new FileReader(new File( fileName)))) { while ((line = br.readLine()) != null) { String[] data = line.split(" "); for (String word : data) { if (wordMap.containsKey(word)) { wordMap.put(word, (wordMap.get(word) + 1)); } else { wordMap.put(word, 1); } } } } return wordMap; } {

public List sortByValue(Map wordMap) // convert map to set Set mapSet = wordMap.entrySet(); // add set to list List mapList = new ArrayList(mapSet); // use utility method Collections.sort(mapList, new Comparator()

{

});

@Override public int compare(Entry o1, Entry o2) { return o2.getValue().compareTo(o1.getValue()); }

return mapList; } public static void main(String[] args) throws IOException { ReadFileAndCount rfc = new ReadFileAndCount(); Map value = rfc.counter("info.txt"); List data = rfc.sortByValue(value); for (Map.Entry getData : data) { sop(getData.getKey() + "=>" + getData.getValue()); }

} } 5 . where to use Comparable and where to use Comparator did you ever used in ur project ans: actually we are not using that interface in our project to sorting data..but i have idea on it that we have to use Comparable if u want to sort the object in collection in simple sorting order like assending or desending if u want custom sorting then better to choose Comparator. 6 . what is bubble sort can you write one programme. .? public class ArraySort { public static void main(String[] args) { int[] arr = new int[] { 6, 8, 7, 4, 312, 78, 54, 9, 12, 100, 89, 74 };

}

for (int i = 0; i < arr.length; i++) { for (int j = i + 1; j < arr.length; j++) { int tmp = 0; if (arr[i] > arr[j]) { tmp = arr[i]; arr[i] = arr[j]; arr[j] = tmp; } } System.out.print(arr[i] + ","); }

} 7 . can I write try block single means without using try-catch or try-finally ans: yes we can write .in java 1.7 there is one features try-with-resources by which ur resourse stream will be closed automatically 8 . what is Executor framework ans:Executor Framework is interduced in Concurrent package normaly if we want use thread pool to achive reusability then we have to choose this one 9 . how many way we can create thread and which one best approach and why ans:There are 4 way 1 . extends Thread 2 . implements Runnable 3. implements Cloneable 4 . using AnonymousThread Preferable is 3rd one coz if you implements from Callable then see below class MyThread implements Callable { public Object call (){ return obj; } Here after execution my thread return something based on requirements u have to choose 2 nd approach also good In both cases we can achive fully abstraction and runtime polymorphism nd multiple inheritance so 2 nd 3 r best approach 10 . jdk version u r using in ur project and why (be care on that question coz they indirectly ask u the advantages of version or latest features added in New

version ) We are using jdk 7 Then tell all the advantages Like 1 . try with resources 2 . multi catch Exp Handler 3 . String Switch case 4 . Diamond Operator 6 . simple way to declare long variable *Jdbc:********** 1 . difference between Statement and PreparedStatement ans:Statement are use if we want to pass static querry or hardcoded value if we uant to pass positional parameter/Runtime value then better to use PreparedStatement and in Simple Statement there may be a chance to get SQL Injection which we can be Resolve by PreparedStatement 2.they give one db schema and ask me to retrieve data from DB by passing id table:===== id name ============= 101 Basant 104 Santosh final String SQL_QRY_FOR_GET_NAME_BY_ID="SELECT NAME FROM EMPLOYEE WHERE ID=?"; 1.class.forName() 2.Connection con=DriverManager.getConnection(); 3.PreparedStatement ps=con.preparedStatement(SQL_QRY_FOR_GET_NAME_BY_ID); 4.ps.setParameter(1,101) 5.ResultSet rs=ps.executeQuerry(); 6.Itterate *Spring :********** 1.What is RowMapper when we have to use it write sample code not completely just give sm hints with flow? ans:See basically if we want to iterate complete entity from db then we have to use RowMapper which are Provided by Spring-Framework by which it can easily featch the data from db and it follow call back Mechanisim so it gives us Resultse as method parameter that we can simple get the data by RS 2.what is ResultSet Extractor where exactly we have to use ? ans: ResultsetExtractor is used if we want to iterate data from db with some specific range or partial ,ya i used it in my project for pagination by assuming display pageNo and size as per SRC 3.if in my Spring bean configuration file I configure same bean with same id 2 times then what is the problem and how to resolve it (contender) ans:we have to use one atribute in Spring-beans configuration file actualy i am not able to remebere that word properly coz we are using eclips id so but it like something Contender ... 4 . Spring Mvc Flow as per your Project = = = = = = = = = = = = = = = = = = =

To make webapp ===================================== ??1 .First From browser u forward request to servlet (Dispatcher Servlet) to handel it.. ??2.Dispatcher Servlet here act as a controller. Who only manage the request processing. ..so it rcv the request and then forward request to HandlerMapping ??3.Handler mapping is framework provide class..Normally in mvc there r several controller Bean so HandlerMapping helps to search appropriate controller Bean based on request url to perform business operation ??4.and 5 After finding controller Bean it process some operation and return MAV object ..to Dispatcher Servlet M:-model A:-and V:-view ??6 . Now after processing business operation response will be generated and it should be display on browser otherwise how enduser know about response. ..so to find appropriate view representer..Dispatcher Servlet call again ViewResolver. .which helps to find appropriate jsp to display view ??7 . Then Dispatcher Servlet render data nd call that jsp which is identify by ViewResolver to view response on browser. .. ??8. Finally Response will be receive by End user. .. 5.Spring transaction, why nd how to work on it ans: we are using Annotation Approach @Transactional(readonly="false",isolation="Read-Commit",propagation="Required") 6. How u handle Exception in ur Project just give some brief idea on it with annotation ans: ya to handle the exception we are creating separate Controller class annotatted with @AdviceController and here we are writting one method by passing the exception as parameter and annotated with method @ExceptionHandler then from my controller i have to pass same logical name which i already return from my adviceController class *Webservices :************** 1 . WSDL ,what are the elements and just explain the role of each section verbally ans: WSDL(Web service Description Language) actually it act as contract betwwen provider and consumer and basically contain 5 section 1)Defination 2)types 3)Message 4)PortType 5)Binding 6)Service Defination:-it act as a root element in XML it just specify the name types:-it talks about each indivisual required input and output to my webservice method message:-it talks about exactly what my web-service method takes a parameter in single unit portType:-it talks about exact structure of your SEI(Service endPoint Interface) Binding: talks about what is the protocol it used and which Message Exchanging format it follows service: it talks about address 2.what is Rest,

ans: Rest is a new architectureal style of develope the webservice or we can say this one is the easyst way to our complex business logic over the network with distrubuted technology with interorporable manner 3 . difference between Soap and Rest ? ans:Both are used to develope webservices only but the basic difference 1.In sopa base web-service we need to depends on Sopa protocol it act as a transport protocol who support only Xml for transfer but in rest it is support not xml it supports XML,JSON,PLAIN_TEXT also 2.Sopa development is complicated in comparision Rest coz we need to depends on Multiple 3rd party vender and procudure is varry from one implementation to anothe implementation 3.Sopa is not Message-Represention-Oriented but rest is M-R-O 4.for security and transaction Soap is Preferable.. 4.Write one Resource method using Http method Post 5.which Response u provide to presentation layer and how to bind Json Response ? ans: We are providing JSON Responce and it will bind through Angular js in UI. 6.Difference between @QuerryParm and @PathPatm which one best and where to use. .. ans: QuerryParm is not mandatory to pass but if u want data is mandatory then PathParm is Best Core-Java----1 st round =================== 1.Interface & abstract class ? ans:Interface is a special type of class through which we can achive fully abstraction runtime polymorphisim and multiple inheritance which makes our code completely loose coupled but in abstract class also we can achive abstraction and R.P but partially..coz it contains both abstract method as well as concret method but in abstract class u can't get multiple inheritance 2.How can u achive Abstraction With Real Time Example(Project) ? ans: As per my project what we people are developed that will be hidden from user so for them it is abstraction otherwise explain Hari sir Bank Atm example 3.In your Project Where u are using oops concept..? ans: Ya we implement all the concept in our project and Encapsulation we used in Business Object or Model class Inheritance and Polymorphisim we implement in Dao and Service Layer to make it loosly coupled 4.Encapsulation u are using in ur project in which layer. ? ans: Ya we are using In Model layer (BO,DTO,FORM) 5.To override all the method from super which keyword we have to use.and why ans: implements keyword coz class+interface== always implements 6.Why abstract class achive less abstraction why not interface.?

ans: Cause Abstract class contain boh concrete and abstract method but it's not mandatory that My subclass always override supperclass method so there is no guarentee to achive fully abstraction 7.Write 5 classes which u r develope in your project with fully qualified name ? Just mention as below 1.MODULE_NAME_DAO---------com.productOwnersortname.module.layer 2.MODULE_NAME_SERVICE 3.MODULE_NAME_CONTROLLER 4.MODULE_NAME_BO 5.MODULE_NAME_DTO 6.MODULE_NAME_MAPPER .MODULE_NAME_UTIL 8.What are the exception u face in ur project development and how u resolve them explain ? ans: 1.NullPointerException:-Resolve by Remote Debugging 2.DataAccessException:-Enter the Column name properly this exception from DAO 3.ClassCastException:-Mentain Typecast or Generics properly 9.Why u are using Spring-jdbc why not hibernate ? ans:Coz my project is Intranet Application and it handles huge amount of data for persist and retrive thats why we are using Spring-Jdbc 10.Which security u are using..? ans:Simple Authentication by using Spring 11.Level of log(Which one u use in your project) ans: DEBUG,ERROR,WARN Second-Round(CoreJava+Spring) =========================== 1.What is abstraction ans:Hide the implementation Provide only Functionality is called abstraction 2.How to create own immutable class write code public class MyImmutable { int no; public MyImmutable(int no) { super(); this.no = no; } public MyImmutable modify(int no) { if (this.no == no) { return this; } else { return new MyImmutable(no); } } } 3.What is singletone ,In your project did u use singletone ,Where write code ? ans:Singleton is object creation design pattern by which we can instantiate only one instance

per one class per one jvm. In my project i didn't use coz we are using Spring so every bean scope is singleton so we no need to make explicitly singleton. 4.Why List allow duplicate why not Set with internal ? ans: Coz List internally follw Array Concept so no there is no restriction in array to allow duplicate but in case of Set it internally follow Map which object u add in set it will be placed as key in That internal Map so duplicate not allowed in Set Just explain the flow of Map ok if he ask more..... 5.What is Dependency Injection ? ans:Dependency Injection is a process of inject dependency in Dependant class automatically we no need create object and no need to map with object .it internally follow Strategy design pattern 6.Which type of Injection u are using in ur project and why.. ans: We are using both setter and constructor injection both coz some fields we need to compolsory inject and some fields are optional for our project 7.What is autoware,Type explain with sample code ans:Autowire is auto enable dependency Inject it is 3 type:1)byName 2)byType 3)Constructor 8.Which version Spring u used.. ? ans:4.x 9.What are the annotation u are using in ur project ? ans:@Componet,@Service,@Controller,@Autowire,@Transactional,@Scope,@ControllerAdvice,@E xceptionHandler @RequestParm,@PathVariable,@ModelAttribute,@PropertyResource 10.Write Spring-transaction configuration ans: 11.Spring-Transaction annotation details with attribute why ? ans: @Transactional(read-only="false",Isolation="ReadCommit",Propagation="Required") 12.@Qualifier annotation use with example ? ans:@Qualifier annotation used to avoid ambiguity error

ex: here class is same but id is different so here my IOC Container confuse due to same class found multiple time so here bean id u want mention in @Qualifier("a1") then IOc will instantiate that bean only 13.@RequestParm and @ModelAttribute where we have to use.. ans:If from form page or from UI page u want to get more 2 to 3 element then use @RequestParm ex:just assume from login page how many element u will get 2 username and pwd use @RequestParm if incoming data will be more then bind them in one object by using @ModelAttribute ex:Suppose u book a ticket then lot of data u have to pass as input like movieName,Time,Location,Nearest hall...etc then choose @ModelAttribute 14.What is ur daily activity in ur working environment ans:Sensiourly working in service and dao based on user story code testing and write junit test case and test it 2 to 3 times participate in daily-Scrum Interview Questions Asked In HCL(Telephonic Round) 1.how to put class in hash map? 2.custom exceptions?(how u will write) 3.XML(total details?) 4.how to iterate database values? 5. what is jndi and explain? 6.weblogic(how u will deploy application in weblogic? Hiebrnate 1.hibernate interfaces? 2.hql queries? 3.how u will change oracle to mysql ? 4.hql to eliminate duplicate values? spring 1. spring ioc? 2.autowiring? how u implementd? 3.setter and constructor injection ?what u implemented in u r project? 4.how to load optional beans? 5.scopes of beans? General 1. static where u used in ur projects? 2.in hash map can u take key as object? 3.hash map(can hash map key allow duplicates)? 4.collections used in u r project? 5.what are the packages u used in ur projects? 6.hash set? 7.how u will eliminate duplicate values from a table? 8.prototype and singleton difference? 9.load on start up? 10.auto boxing and unboxing?

how to manage exception in project which is being developed in spring.. Multiple way is there, but it's quite easy to implement with spring mvc. Normally we are developing Spring based application so in Spring to handle exception multiple predefined class is there .so simply in my project we are

throwing custom exception from service layer and when my controller call service it will catch that exception by using Spring-Aop , We have to create a class which should be annoted as @ControllerAdvice and we have to take one method whose return type is Model And View and method should be annoted as @ExceptionHandler so in this method we have to write the logic for map the exception. And return the same view which is return by controller class at the time of exception raise. And we have to return some user understandable message by view page. Note: Both return logical view should be same

Plz explain Diff between GET and Load in hibernate . just highlight the point When ever u have requirement that deleting row u dont need to get the comple object just load proxy object with id u calln delete it Deleting object from db By get Select * from emp and Delete from emp where id=123 Load Delete from emp where id =123 In load is best when deltion opration When ever u have requirement that update / select row then get is best chioce... need to get the comple object and then update with new values By get Get complete object Update Set new values Load Select .... If set the value it ill load each seeting a new proxy sl it ill degrade performance... In interview they r asking wat kind of design document u r prepared Pls suggest the answer deployement doc ,srs doc ,secnario doc ,uml doc use case doc why main() has less priority than static{} and static() main() is static method..according to execution priority order at class loading time memory first allocated to static variables then static blocks wil be executed,then static methods... how can we deploye application in server in realtime? ChangeManDs ... U need to upload your war/ear each devloper will take updated code by the svn and they make war/ ear have to upload in change man and u i can acess the site direct like normal site... Suppose im a dev shahid some other dev ravi is there i have done my changes at the same time ravi also has done his changes then i can ask to ravi whether his devlopment completed or not if he said completed i ask hin to update in svn and ill merge code and ill war /ear in change man and agter that has to promote dev enviroment ...if it giving expected results for me then ill raise request to aq people to test if it working fine then they ill pomote iat and then finally production. .... There y asked ravi to sync code is if i uploaded ear it ill 30 mins to avail in

server so it is better to synchronize with team...after i update again ravi updated means 1 hr wast right. .. The ur for in dev which i have tested is Www.bhpa.com/dev1/.....etc Www.bhpa.com/qa2/... Www.bhpa.com/iat Hi friends any one knows ofbiz in j2ee technology ofbiz framework Can anyone explain me the meaning of term "Inversion of Control" in spring? The question is "What sort of control are they inverting"?? I just want to dig dipper into this term ??...Thanks in advance IOC is a principle. IOC will collaborate the object. Collaborate means manage the object by injecting one object into another. IOC will manage the life cycle of the object. Since spring container can also collaborate the object and manage the life cycle of the object so it is called as IOC container. There are two ways using which we can collaborate objects. IOC is of two types, again each type is classified into two more types as follows1. Dependency Lookup a) Dependency Pull b) Contextual Dependency lookup 2. Dependency Injection a) Setter Injection b) Constructor Injection Dependency LookupIt is very old technic which is something exists already and most of the J2EE applications use. In this technic if a class need another dependent object, it will write the code for getting the dependency. Again it has two variants as said above. a) Dependency Pull If we take J2EE web application as example, we retrieve and store data from database for displaying the web pages. So, to display the data our code requires connection object as dependent, generally the connection object will be retrieved from a connection pool. Connection pool are created and managed by application server. Below diagram shows the sameOur component will look up for the connection from the pool by performing a JNDI lookup. it means we are writing the code for getting the connection indirectly we are pulling the connection from the pool. So, it is called dependency pull. pseudo code Context ctx=new InitialContext(); DataSource ds=ctx.lookup("jndi name of cp"); Connection con=ds.getConnection(); //pulling the connection? b) Contextual Dependency Lookup In this technic our computer and our environment/server will agree upon a contract/context, through which the dependent object will be injected into our code. For exampleIf we our servlet has to access environment specific information (init params or to get context) it needs ServletConfig object, But the servletContainer will create the ServletConfig

object. So in order to access ServletConfig object in our servlet, our servlet has to implement servlet interface and override init (ServletConfig) as parameter. See the below diagramServletConfig will be injected into servlet by the container. Now the container will pushes the config object by calling the init method of the servlet. Until our code implements from servlet interface,container will not pushes the congig object, this indicates servlet interface acts as a contract between we and our servlet . that�s why it is called Contextual dependency lookup. Dependency Injection The new way of acquiring the dependent object is using setter injection or constructor injection 1.Setter Injection In setter injection if an object depends on another object then the dependent object will be injected into the target class through the setter method that has been exposed on the target classes as shown belowpackage com.si.bean; class Car { private Engine engine; public void setEngine(Engine engine) { this.engine=engine; } public void start() { engine.start(); } } } package com.si.bean; class Engine { private int engNo; public void setEngNo(int engNo) { this.engNo=engNo; } public void engStart() { System.out.println("Engine starts"); } } In above application �Car� needs the object of �Engine� it means �Car� is the target class in which the dependent object of �Engine� will be injected by calling the exposed setter method.If we want our class to be managed by spring then we have to declare our classes as spring beans in spring bean configuration file as followsapplication-context.xml

2.Constructor Injection In this technic instead of exposing a setter, your target class will expose a constructor, which will take the parameter as our dependent object. As our dependent object gets injected by calling the target class constructor, hence it is called constructor injection as shown belowpackage com.si.bean; class Car { private Engine engine; public Car(Engine engine) { this.engine=engine; } public void start() { engine.start(); } } package com.si.bean; class Engine { private int engNo; public void setEngNo(int engNo) { this.engNo=engNo; } public void engStart() { System.out.println("Engine starts"); } } In target class �Car� we have declared constructor in which attribute �engine� is of dependent type �Engine� is declared as parameter in it. Now to tell the spring to manage the dependency again we have to declare �car� and �Engine� as bean in Spring bean configuration file like followingapplication-context.xml Now create the IOC container and test the application as belowpackage com.si.bean; class CarTest { public static void main(String[] args) { BeanFactory factory=new XmlBeanFactory(new ClassPathResource("applicationcontext.xml")); Car c=(Car) factory.getBean("car"); c.start(); } }

O/P Engine starts In both setter injection and constructor injection we are asking the �Car� object from IOC container it will give us by injecting �Engine� class object. So, when we call star() method of car class it will goes there and call EngStart() method of Engine class. Hence, we see that we have not created the Engine class object it is created by spring and injected into the Car class object either by setter or constructor. Usually we will create the object and place it in the container and use it. So here you have the control over objects. In case of spring, the task of creating the objects, and supplying it where ever necessary is taken over by Container. As the control is inversed ( reversed ) , we call it as "inversion of control" how should i start explain about project architecture. means , what kind of thing i have to tell.should i mention the technologies which i have used in my project .can anyone tell me the best way to explain about project architecture? Project Architecture means to be straight it depends on your project IG, For Example I am giving any health care project OK. So first u should tell 1.Project name 2.Client 3.Technolgy used 4. What are the modules and sub modules. 5.which module u worked Then starts from your UI things Draw a project UI then pull one by one concept. Means explain this is the scenario where I used soap web service or rest This is the case where I used JMS. Collection, And always explain him like assume I have user online appointment page OK. So tell their we have one registration page after fill data there is register button, by clicking on that request goes to controller--service - - server Validation - - - Dao It stores on our local DB nd mapped with multiple Sub Resource DB. Like this u have to explain. This is the sample I explained. Based on ur project flow, follow the same approach.

Can anyone post a example on how to create a simple maven multi module project using spring MVC with service and dao with one working example ?

Yes I already did the same thing also I copied child module groupid, archetypeId and version copied and attached in parent as a dependency , but where I need to place our service and dao classes, when we run the parent project automatically all child modules also get executed and display the output. How I will do it , can u send me in sample and derive that process also. Create a parrent folder and create pom for that. and then add code as per below. And create separate folder for each module and they have their own pom again pom logging-module scheduler-module customer-module sales-module how many ways we can send data to resource in restful services..? Header in (@Headersparam) , cookies-(@cookiesParam) uri-(@QyeryParm TemplateParm Matrix parm @ pathparam ) via body(.XML 2.JSON 3.Simple Raw ) why we cannot apply j2ee security for web service security.why we should go for wssecurity? We can add simple J2ee security also np. But it's is very less secure. Nd internally ws policy or interceptor internally follow Web security only with different mechanism like token, bit size increase security will not work in all situations. There can come a time when the client can talk to multiple servers. An example given below shows a client talking to both a database and a web server at a time. In such cases, not all information can pass through the https protocol This is where SOAP comes in action to overcome such obstacles by having the WS-Security specification in place. With this specification, all security related data is defined in the SOAP header element. Hii everyone... After completing the project architecture generally interviewed ask where u used customer exception,multithreading,encapsulation,abstraction,and singleton bean... in your peoject.... can any one explain all topic Encapsulation :we used in our Entity/Model/pojo class Custom Exception :Normally we are using it from dao and service layer like suppose m searching user from db based on id. If it is not found in db. Then from service we need to throw out custom exception and in controller we need to use try catch to handle this.. Nd wrapping the failure response in in catch itself. Singleton :depends on which framework u r using. If u r using Spring then u can say by default every bean scope is singleton so we are not writing it manually. Else tell like u r making singleton where u r getting SessionFactory instance and Invoked class means which called other services. Multithreading :no used as of now We have custom exception for our project ,in that for a porject there is one base exception,after that for module spearte exception is extended from base exception,then for a layer exception and for operation one exception all those are

hierarchical difference b/w homogenous and heterogeneous objects....? A container that contains or holds objects of a single type is said to be homogenous. On the other hand, A container that contains objects (derived from a common base class) of a variety of types is termed heterogeneous. EX LIKE Array contains student type of data if we insert employee data then it will throw exception. Heterogeneous means like collection ,in collection we can take different type of object at a time . Hi, in the scorecard, every second automatically refreshes and displays present score how it works and implementing by using java? I mean not using java only. Create an object scoreboard which gets updated on every time a record being insert or update into db. In ui use meta refresh as 5 to make your data update in every 5 seconds or else use ajax. bro absolutely R8. For this we need to use any in memory container to update and fetch. M providing static code using multithreading. package com.sjgm.question;

public class ScoreBoard {

public synchronized void displayScore(String teamName, int over) { for (int i = 0; i