About using SessionContext in EJB

Hi ,
I am new to EJB . I am going through the topic of SessionContext .
I found this
Where as SessionContext is an EJBContext object that is provided by the EJB container to a SessionBean in order for the SessionBean to access the information and/or services or the container.
Can anybody please tell me what type of information or services would be obtained from a SessionContext .

The session context allows access to the User Transaction, EJB home interfaces and security aspects. Check out the mehtods available to this class in the API docs.
m

Similar Messages

Do i have to use JNDI with EJBS?

Hi
I want to use JNDI to lookup a system which i will send messages to using JMS. I would like to have some java classes on Tomcat to do the job. But...whenever i hear about JNDI it is always in relation to EJBs. Can i only use JNDI with EJBS?
If i can use JNDI is there anything important i need to know about.
Thanks in advance!
San H.

You can definitely use JNDI outside of EJB's - in particular, it's a great interface for dealing with LDAP servers, even securely, and can also be used for DNS interfacing, COS, RMI registries, etc.
While JNDI was chosen as the method by which J2EE components can locate other components in a distributed environment, it's by no means limited to that task :) It's a wonderful API, and in terms of things you need to know, most everything is covered fairly well at the JNDI tutorial in the various trails that are mapped out there.
http://java.sun.com/products/jndi/tutorial/
Good luck!
James
James Manning | Principal Engineer
Porivo Technologies, Inc.
919.806.0566 | [email protected]
http://www.porivo.com/
Measuring end-to-end Web performance.
Register for a FREE Performance appraisal:
http://www.porivo.com/peerReview/eval.html

Do i have to use JMS with EJBS?

Hi
I want to use JMS as a messaging system (a queue) between my system and someone elses. I would like to have some java classes on Tomcat to do the job. But...whenever i hear about JMS i always hear it in relation to EJBs. Can i only use JMS with EJBS?
If i can use JMS is there anything important i need to know about.
Thanks in advance!
San H.

As far as I understand you are use JNDI and JMS is not bound with EJB's. These are java API's which are independent. Like JDBC you can use with Servlets, Applets, standalone applications, EJB, JMS etc etc.......
In the same way you can use JNDI and JMS with diferent API. And the important feature of Java is that all java API interact with each other when these are independent. I would appricate comments of everyone......................Thanks

Which of the following are true about abstract methods in EJB 2.0

Hi guys I'm beginner to EJB and i got some unanswered questions.
Can any one of you please.. give answers?
Thanks if you do...
Which of the following are true about abstract methods in EJB 2.0
CMP?
Choose all correct answers:
1. Abstract accessor methods should not be exposed in the EJB
component's interface
2.Abstract accessor/mutator methods are used to access and modify
persistent state and relationship information for entity objects
3.Abstract Accessor/Mutator methods do not throw exceptions
4.The EJB developer must implement the Accessor/Mutator methods
5.Abstract accessor methods may or may not be exposed in the EJB
component's interface
2.Which ONE of the following is true?
Choose the best answer:
1.Local interfaces cannot have a relationship with other Entity
components
2.Local interfaces cannot be used for Stateless Session EJB
3.Local interfaces can be a part of Object's persistent state
4.Local interfaces have the same functionality as that of a
stateless Session EJB
3.Which of the following describe the <cmr-field> in a EJB 2.0
descriptor?
Choose all correct answers:
1.A Local interface/Entity can be a value of a <cmr-field>
2.There is no <cmr-field> in EJB 2.0 descriptor
3.It is used to represent one meaningful association between any
pair of Entity EJBs, based on the business logic of the Application
4.It provides a particular mapping from an object model to a
relational database schema
5.It allows the Local Entity interfaces to participate in
relationships
4.Which of the following are the advantages of using Local interfaces
instead of dependent value classes?
Choose all correct answers:
1.Local Entity Interfaces can participate in Relationships
2.The life cycle of Local Entity Interfaces is managed by EJB
container, intelligently
3.Local Entity Interfaces can be used in EJB QL Queries
4.Local Entity Interfaces can be a part of the <cmp-field> but not
<cmr-field>
5.Which of the following are true about Local interfaces
1.A local interface must be located in the same JVM to which the EJB
component is deployed
2.Local calls involve pass-by-reference.
3.The objects that are passed as parameters in local interface
method calls must be serializable.
4.In general, the references that are passed across the local
interface cannot be used outside of the immediate call chain and must
never be stored as part of the state of another enterprise bean.
6.Which of the following specifies the correct way for a client
to access a Message driven Bean?
Choose the best answer:
1. via a Remote interface
2. via Home interface
3. Message driven bean can be accessed directly by the client
4. both 1 & 2
5. none of the above
------------------------------------------------------------------------7.Which of the following statements are true about message-driven
bean Clients?
------------------------------------------------------------------------Choose all correct answers:
They can create Queue and QueueConnectionFactory objects
They can create Topic and TopicConnectionFactory objects
They can lookup the JNDI server and obtain the references for
Queue and Topic and their connection Factories
Only 1 and 2 above

Hi guys I'm beginner to EJB and i got some unanswered
questions.
Can any one of you please.. give answers?
Thanks if you do...
Which of the following are true about abstract methods
in EJB 2.0
CMP?
Choose all correct answers:
1. Abstract accessor methods should not be exposed
d in the EJB
component's interfacefalse
2.Abstract accessor/mutator methods are used to
access and modify
persistent state and relationship information for
entity objectstrue
>
3.Abstract Accessor/Mutator methods do not throw
exceptionstrue
>
4.The EJB developer must implement the
Accessor/Mutator methodsfalse
5.Abstract accessor methods may or may not be exposed
in the EJB
component's interfacetrue
2.Which ONE of the following is true?
Choose the best answer:
1.Local interfaces cannot have a relationship with
other Entity
componentsfalse
2.Local interfaces cannot be used for Stateless
Session EJBfalse
3.Local interfaces can be a part of Object's
persistent statefalse
4.Local interfaces have the same functionality as
that of a
stateless Session EJBtrue
3.Which of the following describe the <cmr-field> in a
EJB 2.0
descriptor?
Choose all correct answers:
1.A Local interface/Entity can be a value of a
<cmr-field>true
2.There is no <cmr-field> in EJB 2.0 descriptorfalse
3.It is used to represent one meaningful association
between any
pair of Entity EJBs, based on the business logic of
the Applicationtrue
4.It provides a particular mapping from an object
model to a
relational database schematrue
5.It allows the Local Entity interfaces to
participate in
relationshipstrue
4.Which of the following are the advantages of using
Local interfaces
instead of dependent value classes?
Choose all correct answers:
1.Local Entity Interfaces can participate in
Relationshipsis
2.The life cycle of Local Entity Interfaces is
managed by EJB
container, intelligentlyis
3.Local Entity Interfaces can be used in EJB QL
Queriesnot
4.Local Entity Interfaces can be a part of the
<cmp-field> but not
<cmr-field>not
>
>
5.Which of the following are true about Local
interfaces
1.A local interface must be located in the same JVM
M to which the EJB
component is deployedtrue
2.Local calls involve pass-by-reference.true
3.The objects that are passed as parameters in local
l interface
method calls must be serializable.false
4.In general, the references that are passed across
s the local
interface cannot be used outside of the immediate
e call chain and must
never be stored as part of the state of another
r enterprise bean.true
>
6.Which of the following specifies the correct way for
a client
to access a Message driven Bean?
Choose the best answer:
1. via a Remote interfacefalse
2. via Home interfacefalse
3. Message driven bean can be accessed directly by
the clientfalse
4. both 1 & 2false
5. none of the abovetrue.
>
----------------7.Which of the following statements
are true about message-driven
bean Clients?
----------------Choose all correct answers:
They can create Queue and QueueConnectionFactory
objectsthe container can, dunno bout clients
>
They can create Topic and TopicConnectionFactory
objectsthe container can, dunno bout clients
>
They can lookup the JNDI server and obtain the
references for
Queue and Topic and their connection Factories
true
Only 1 and 2 abovefalse
somebody correct me if i'm wrong

When to Use Servlet only, EJB only and, both Servlet And EJB???

I have a question, If I want to build a Web application. Sometime i found that there is no need to use EJB as Servlet already provide that functionality.
Can anyone tell me when do I use Pure Servlet? When do I use Pure EJB and, When do I use Both EJB and Servlet???
I am very interesting in it.
Thanks.
Jack

EJB and servlets are two different things. Trying to compare them doesn't really make sense. A web application is always going to need some way to process Http requests and this in Java is done accomplished through Servlets (or jsp pages which in turn also use servlets).
EJBs are the basis of distributed cross-platform objects. They are handled through name services and stored in databases. An Entity Bean can be "brought back to life" as long as it's info is stored in a database. Regardless of a server being restarted. All this database support behind an Entity Bean (transactions, queries etc.) are very transparent to the programmer. They are provided by the EJB vendor.
The class properties of a Servlet (or class-level member variables) are shared among all requests (running thread instances of the service method). That's why they should be used with a lot of caution. This feature can be very useful but if used improperly can also be very vulnerable to security and synchronization issues.
I'm not an EJB expert but this explanation should give you some idea of what EJBs are all about.

Question about using Runtime.getRuntime();

hi all
i have a question about using Runtime.getRuntime(). if i use this to get a runtime reference to run an external program, is it considered as starting a new thread inside the thread that starts it?
is it safe to do it in the Session EJB? if not, what can you recommand to do it? thanks

hi all
i have a question about using Runtime.getRuntime().
if i use this to get a runtime reference to run an
external program, is it considered as starting a new
thread inside the thread that starts it? No. Starting a process, starts a process. Threads have nothing to do with it.
is it safe to do it in the Session EJB? if not, what
can you recommand to do it? thanksSo what? Run another process? If you want to run another process in java then your choices are to use Runtime.exec() or use JNI. And using JNI will probably end up doing exactly the same thing as Runtime.exec().
"Safe" is harder. Typically to correctly use Runtime.exec() you must use threads. And as noted threads ideally should not be used. You can use them but if you do you had better understand why they didn't want you using them in the first place. You had also better be sure that you really want to wait for it to complete.
Other than that Runtime.exec() is safe because it can't crash the VM like other interfaces can (like JNI.)

What strategy do you use for development EJB-JSP ?

Hi all,
I'd like to share opinion about development phase.
In particular what is the best strategy for development
of JSP-EJB applications?
1. You keep JSP files unpacked under your Context and copy EJB interfaces in the /classes directory
Pro: quick web development, no packing/unpacking of files
Contros: proliferation of EJB interfaces both on Web side and on the EJB side
2. keep JSP files and EJB interfaces into an .ear file and drop the ear file in the deploy directory for every modification.
Pro: compact distribution of application, no need to keep duplicate copies of EJB interfaces
Contros: packing/unpacking of ear/war files needed for every single modification of jsp/ejb
What do you think?
Thanks
Francesco

I certainly package the stuff in an EAR file - this EAR file contains the WAR file with my JSP/Servlet/Struts code & the required EJB interfaces. As well as the WAR file, the EAR file contains a JAR for the bean implementation. I want to correctly split this up in case I end up using a seperate EJB and Servlet container - my current seperation doesn't really allow for this at the moment. I guess this would involve building:
1.) app-common.jar - Bean interfaces, utils, data transfer classes etc
2.) webapp.war - Front end client code including JSP's, Servlets, Struts code etc
3.) ejb.jar - The bean implementation
Many containers only support deployment using an EAR file - supporting deployment of unpacked structures is not a requirement in the J2EE spec and so it will depend on whether or not. JBoss 3.0 hot deployment is fairly good so getting ant to stick my EAR file in the deploy directory after each build is normally not much bother (only the occasional full restart)

Questions about Using APIs to import Bills and Routings - AND COSTS

Hi Forum - the following is a back-and-forth with a customer about use of APIs - Inventory developer suggested I post the question here. Note the 2nd question - and thanks for any assistance.
SR# 7332152.994 ALCOA
Instructions given to ct:
Q1 - Can I load the bill header and components at the same time?
You should be able to load the bill header and components at the same time. Customer loads bill and component data inserting enough "other" data for each so that the bill sequence id will be derived. For the component record, the assembly item, org and alternate_bom_designator values will be used by BMCOIN to derive the bill_sequence_id.
Example:
INSERT INTO BOM_BILL_OF_MTLS_INTERFACE
ORGANIZATION_CODE,
ITEM_NUMBER,
ALTERNATE_BOM_DESIGNATOR,
PROCESS_FLAG,
TRANSACTION_TYPE
VALUES
'M1',
'&PARENT_ITEM',
NULL,
'1',
'CREATE'
INSERT INTO BOM_INVENTORY_COMPS_INTERFACE b
ORGANIZATION_CODE,
ASSEMBLY_ITEM_NUMBER,
ALTERNATE_BOM_DESIGNATOR,
COMPONENT_ITEM_NUMBER,
OPERATION_SEQ_NUM,
COMPONENT_QUANTITY,
EFFECTIVITY_DATE,
PROCESS_FLAG,
TRANSACTION_TYPE
VALUES
'M1',
'&PARENT_ITEM',
NULL,
'&COMPONENT_ITEM',
1,
1,
trunc(SYSDATE),
1,
'CREATE'
Hi Aruna, some additional information that may be useful:
We can load/create the bill header and components at the same time using the scripts given (as above)
Required Data for Creating a Routing : assembly_item_id,
organization_id, routing_type, transaction_type, process_flag
And following scripts can be used to load routing header and operations equences.
INSERT INTO BOM_OP_ROUTINGS_INTERFACE
(assembly_item_id,
organization_id,
routing_type,
transaction_type,
process_flag)
VALUES (2255800,207,1,'Create',1);
INSERT INTO BOM_OP_SEQUENCES_INTERFACE
(assembly_item_id,
organization_id,
operation_seq_num,
Department_code,
effectivity_date,
transaction_type,
process_flag,
operation_description)
VALUES
(2255800,207,100,'ASSEMBLY',
to_date('24-FEB-2009'),'Create',1,
'Paint Wagon');
Q2: One more question, can an expense item can be added to the bill and can contribute the cost.
As there is a confusion of what I asked, below I am rephrasing my question
By an Expense Inventory Item, I mean an item that is just tracked for quantity only i.e.,Checking the attributes - Inventory Item, Stockable, Transactable under Inventory Tab and not checking the attribute - 'Inventory Asset Value'.
My question here is, For these Expense Inventory Items, What is the difference between having the 'Costing enabled' attribute turned ON as opposed to having it UNCHECKED
*Q3 I have tried to load the items and I could only load 1st level of components but could not load second level of bom at the same time.
While inserting I have inserted plan level too.
Please let me know if I have to do anything different to load second level.*
Thanks
James

You may want to look at using the more4apps bill of materials wizard, an excel based solution for uploading assemblies and their components.

Advice on which Mac laptop to buy / Advice about using WIndows on it.

I'd appreciate some advice on which replacement laptop to get for someone in my family who just needs e-mail, the Internet, and iPhoto--something simple, small, and portable, like the iBook or the MacBook Combo. However, he has just complicated matters by saying that he'd like to be able to use Windows on his new computer (yech).
I don't know anything about using Windows on a Mac, not even whether this feature is now built into all Macs or not. A recent post I found on virtualization (February, 2006) quotes Microsoft as saying that Virtual PC won't run on an Intel-based Mac (MacBook), though it will on the iBook and the Powerbook.
Here are the questions I'm trying to answer: (a) Is running Windows on the MacBook Combo an issue? If Microsoft doesn't make virtualization for the MacBook, are there other companies who do? (b) Are there features/lack of features on a MacBook that mean it makes more sense to get the least-expensive iBook instead or vice-versa? Again, simplicity and ease of use are the goal here, not state-of-the-art technology. (c) Can you even buy a new iBook or Powerbook any more, since the Apple website seems to feature only the MacBook?
Thanks in advance for suggestions about any of this!
Powerbook G4 Mac OS X (10.3.9) 15"

For what your
family member want to do the 1.83GHz MacBook will be
just fine. Just be aware that if they want to write
DVDs at any time they will have to purchase an
external DVD writer.
As for Windows, there are two options for running
Windows on a …
1) Use Apple's software, Boot Camp…
http://www.apple.com/macosx/bootcamp/
… which provides the ability to use you MacBook as a
Windows computer. Please note that a restart will be
required and only one OS will be available at any one
time. Additionally it is suggested that at least a
20GB larger drive be purchased to accomodate the
Windows partition.
2) Use Parallels…
http://www.parallels.com/
… which uses Virtualisation Technology. This allows
Windows to be used under Mac OS X just like Virtual
PC did with the PowerPC Macs. While this is far more
convenient it's performance does not match that of
Boot Camp although it is still rather snappy for more
requirements. It does vost money where Boot Camp is
free. Again, a larger drive is recommended.
For both Parallels and Boot Camp Windows will operate
at native PC speeds so do not consider an iBook or
PowerBook.
Thanks, that's helpful. One more question, now that I've looked at the MacBook more carefully: We use dial-up for e-mail and the Internet; this works very well for us and we have no immediate plans to change. Since the MacBook has no internal modem, would you or anyone else reading this say the Apple USB external modem works as advertised?
I see that the Apple USB modem gets very mixed reviews--some people say it's fine, others seem to find it slower than the internal version, and several think it's a piece of junk.
Would you (or anyone else reading this) have any experience using the Apple USB modem for dial-up connection? [That's not meant to be an insult. :-)] Would we now have to expect our dial-up connections to be slower than before? Or do we just have to be sure we have the right settings, compatible server, etc.? Or is the problem Apple's product, and would a 3rd-party product work better?
Powerbook G4 Mac OS X (10.3.9) 15"

There is a lot of talk aout there about using a 27" iMac as a display with the mini displayport to displayport cable. It is so exciting! I am trying to connect a PC laptop with a VGA port to a 27" Dell Latitude D620?

In 2010 there was a question about using a 27" iMac as a display with a Dell laptop.
I am trying to connect a work Dell laptop Running Windows XP via a VGA cable to my personal iMac 27"
running iMac 27", Mac OS X (10.6)
Has anyone tried this or know if imac 27" Mini port with a VGA adapter can work?
I apologize if I missed this discussion already
Kind Regards
Gilly

Hi Gilly,
I have no proof, but I think it will not work with an adapter, only Mini Display Port or Thunderbolt.

Needs help.....Please about using different classes

I don't know how to use differenet classes.
Please tell me how to write class to suit Start. This stuff me up. Please .... help me
<<My program>>
//Start
public class Start
{ private Artist[] Artists;
private Record[] records;
private Person[] Manager;
private TextMenu makeMenu = new TextMenu();
public static void main(String[] args)
     Start studio = new Start();
studio.menu();
public Start()
{ //Person.Manager(ManagerName,HouseNumber,StreetNumber,PhoneNumber)
     Manager = new Person[1];
     Manager[0] = new Person("Yangfan",88,"Young ST",11118888);
     //Artist(GroupID,ArtistName,HouseNumber,StreetNumber,PhoneNumber)
     Artists = new Artist[5];
Artists[0] = new Artist(1,"Backstreet Boys",58,"Music ST",99998888);
Artists[1] = new Artist(2,"Santana",68,"Music ST",99998899);
Artists[2] = new Artist(3,"Macy Gray",78,"Music ST",55558888);
Artists[3] = new Artist(4,"Ricky Martin",88,"Music AVE",77778888);
Artists[4] = new Artist(5,"Did Rock",55,"Music Road",66667777);
//Record(RecordingID,RecordName,Artist,StartTime,FinishTime,RecordingDate,GuestArtist1,GuestArtist2)
records = new Record[6];
records[0] = new Record(1,"I want it that way",Artists[0],11,12,"05/08/2001",Artists[1],Artists[3]);
records[1] = new Record(2,"Smooth",Artists[1],11,12,"05/08/2001",Artists[1],"");
records[2] = new Record(3,"Do something",Artists[2],11,"05/08/2001",Artists[3],"");
records[3] = new Record(4,"Livin La Vida Loca",Artists[3],11,12,"05/08/2001",Artists[1],Artists[3]);
records[4] = new Record(5,"Bawitdaba",Artists[4],11,13,"05/08/2001",Artists[1],"");
records[5] = new Record(6,"The one",Artists[0],11,14,"05/08/2001",Artists[1],"");
public void menu()
{ String[] choices = {">>>List Manager Details",">>>List All Artist Names",">>>List An Artist Telephone-Number",">>>Show Details For One Recording",">>>Add A New Recording",">>>List The Recording Costs For All Artists",">>>List Artist's Reocording",">>>Exit Program"};
while (true)
{ switch (makeMenu.getChoice(choices))
{ case 1: showAllArtists();
break;
case 2: showAllRecords();
break;
case 3: System.exit(0);
break;
case 4: System.exit(0);
break;
case 5: System.exit(0);
break;
case 6: System.exit(0);
break;
case 7: System.exit(0);
break;
case 8: System.exit(0);
break;
default:
public void showAllArtists()
{ int numArtists = Artists.length;
for(int i = 0; i < numArtists; i++)
{ Artists[i].displayArtistDetails();
public void showAllRecords()
{ for (int i = 0; i < records.length; i++)
{ System.out.println();
records.printRecordDetails();
<<Assignment>>
Due - midnight, Wednesday August 22nd
This assignment will test your knowledge of Java programming using classes, encapsulation and javadoc.
The base requirements
Write a complete Java class to manage a Digital Recording Studio. The studio wants to keep a list of all Artists that use the studio and also wishes to keep track of all Recordings that have been made. An important function of the program is to calculate the time spent making a recording and charge the Artist for the time used.
You must create at least the following classes, Start, Studio, Person, Artist, Recording, Address. You may create other classes if needed as well
Start will contain main(), create one instance of a Studio and execute a Menu of commands to test your code. Studio should contain a studio name, an array of Artist and an array of Recording plus the studio manager (a Person). Each Artist should contain the name of the group and an Address. Each Person will have a name and a home address. Each recording will have a Title (usually song title), an Artist (only one), and a list of guestArtist (they are Artist�s but will not receive royalties) the number of the CD the recording is stored on (numbers are numerical and recordings are saved on CD-R), plus the recording start and finish times for the recording session (suggest you use Java Date class � refer to the API). An Address will contain, house number (integers only), a street name and a telephone number. There is no need to store city and country.
To enter a set of data for testing your program � main() should call a method in the Start class that will fill in a set of values by creating objects and filling in values by calling methods in each class. This is the ONLY method allowed to be longer than 1 page long � normally we would read the data from a file but there are no O-O principles that can be learnt with simply filling in data values. It is suggested to create say at least 4 Artist�s and 6 Recordings (at least one with 1 guest Artist and one with 2 guestArtist�s)
A menu for testing your program should be provided (it is suggested to put the Menu into a separate class as you need at least 3 menus). While other commands are possible, only the following ones will receive marks.
Menu commands needed are
List the Managers name, address and telephone number
List all Artist Names
List an Artist telephone number (a sub menu showing valid Artist�s is required)
Show all details for one Recording ( sub menu of valid Recordings will be needed and remember there can be more than one guestArtist)
Add a new Recording, user will need to be prompted for all details.
List the recording costs for all Artists � show each Artist on a separate line with their name and total amount, charge for using the studio is $1000 per hour or part thereof, example for a 1 hour and 10 minute recording the Artist will be billed for 2 hours.
List all the Recording�s one Artist has worked on (sub menu of Artists needed), the list should show whether they were the Artist or a guestArtist
Exit program
Use fixed sizes for arrays, suggest 20 is suitable for all arrays. Java can handle dynamic data structures (where the number of elements can grow or shrink), but that is beyond a first assignment.
Do NOT make ANY methods static - this defeats the Object Oriented approach and will result in ZERO marks for the entire assignment.
Data MUST be encapsulated, this means that all the data relating to an object are to be stored INSIDE an object. None of the data detail is to be globally available within your program - hence do not store Artist names in either Studio or Recordings � just store a reference instead. Do NOT create ID numbers for Artists, you should use References instead � for many students this will be the hardest part as you have to use Objects, not program in a C style to solve the problem. Note that if there are any non-private data in classes then zero will given for marks for encapsulation.
Good programming style is expected (see web page or lecture notes). In particular, you must use javadoc to generate a set of html pages for your classes. Make sure you use the special javadoc style comments in your source code. Marks will be granted for both using javadoc and also for including sensible javadoc comments on each class and each public method.
What to Hand In
Read the turnin page, basically the .java files, a readme.txt to tell the marker which file the program starts from plus the javadoc (html) files. Do NOT send .class files (if you do send these we will delete them and recompile your program), do NOT compress with gtar, tar, zip or use any other tool on your files. Turnin automatically compresses all your files into a single archive for us to mark.
The simplest way to turnin all your files is to place all files in one directory then just use the *.* wildcard to turn in all files within that one directory.
You must turnin all files that are not part of Java 1.3. In particular, you are allowed (actually encouraged) to use EasyIn or SavitchIn but should include the one you use in the files you submit. It is STRONGLY suggested that you copy all the files into another directory, test it works there by compiling and executing then turnin files from that directory. A common problem is students adding comments at the last minute then not testing if it still compiles. The assignment will be marked as submitted � no asking later for leniency because you added comments at the last minute and failed to check if it still worked.
If the tutors are unable to compile your submission, they will mark the source code but you will lose all the execution marks. Sorry, but it is your responsibility to test then hand in all files.
Comments
For CS807 students, this program should be fairly easy if it was to be programmed in C (you would use several struct). The real art here is to change over to programming objects. Data is contained in an object and is not global. This idea is essential to using Java effectively and is termed encapsulation. Instead of using function(data), you use objectName.method( ). Effectively you switch the data and functions around, the data has a method (function) attached to it, not the other way around as in C (where you have a function and send data to it).
While there will be some marks for execution, the majority of the marks will be given for how well you write your code (including comments and documentation) and for how well you used O-O principles. Programs written in a C style with most of the code in one class or using static will receive ZERO marks regardless of how well they work.
You are responsible for checking your turnin by reading the messages turnin responds with. Failure to read these messages will not be an acceptable excuse for submitting an incorrect assignment. About 2% of assignments sent to turnin are unreadable (usually empty) and obtain 0.
Late submissions
Late submissions will only be accepted with valid reasons for being late. All requests for assignment extensions must be made via email to the lecturer. Replies for acceptance or refusal will made by email. Instant replies are unrealistic (there is usually a flood of queries into my mail box around assignment due dates) and the best advice is to ask at least 4 days in advance so that you will have a reasonable chance of getting a timely reply and allow yourself enough time to submit something on time if the extension is not granted.
ALL late submissions will be marked LAST and will NOT be sent to tutors for marking until all other assignments have been marked. As an example, if you submit late and your assignment is not yet marked by the time assignment 2 is due then it will be pushed to the end of the marking pile as the assignments that were submitted on time for assignment 2 will take priority.
If you make a second submission after the submission date, only the first submission will be marked. We will not mark assignments twice! You can update your submission BEFORE the submission date if you need to - this will just overwrite the first submission. The latest time for a late submission is 5pm on the Wednesday after the due date. This is because, either a solution will be handed out at that lecture or details of the assignment will be discussed at the lecture. I cannot accept any assignment submissions after that time for any reason at all including medical or other valid reasons. For those who are given permission to be later than the maximum submission time � a different assignment will be handed out. Remember, if you decide to submit late you are VERY UNLIKELY to receive feedback on your assignments during semester.
Assignments will be removed from turnin and archived elsewhere then forwarded to tutors for marking on the morning after the assignment is due. A different tutor will mark each of your assignments � do not expect the tutor you see at the tutorials to be your marker.
Marks will be returned via email to your computer science yallara account � ideally within 2 weeks. I will send marks out when I receive them so do not send email asking where your marks are just because a friend has theirs. If you want your email forwarded to an external account, then place a valid .forward file into your yallara account. The Help Desk on level 10 can assist you in setting this up if you do not know how to do it.

I have seen other people who have blatantly asked for
other people to do their homework for them, but you
are the first person I've seen to actually cut and
paste the entire assignment as it was handed to you.
Amazing.
Well, unlike some of the people you're talking about, it seems like zyangfan did at least take a stab at it himself, and does have a question that is somewhat more sepcific that "please do this homework for me."
Zyangfan,
marendoj is right, though. Posting the entire assignment is kind of tacky. If you want to post some of it to show us what you're trying to do, please trim it down to the essential points. We don't need to see all the instructor's policies and such.
Anyway, let me see if I understand what you're asking. You said that you know how to write the code, but only by putting it all in one class, is that right? What part about using separate classes do you not understand? Do you not know how to make code in one class aware that the other class exists? Do you not know how code in class A can call a method in class B?
Please be a bit more specifice about what you don't understand. And at least try using multiple classes, then when you can't figure out why something doesn't work, explain what you did, and what you think should have happened, and what did happen instead.
To get you started on the basics (and this should have been covered in your course), you write the code for two classes just like for one class. That is, for class A, you create a file A.java and compile it to A.class. For class B, you create a file B.java and compile it to B.class. Given how rudimentary you question is, we'll skip packages for now. Just put all your class files in the same directory, and don't declare packages in the .java files.
To call a method in class B from code that's in class A, you'll need an object of class B. You instantiate a B, and then call its methods.
public class B {
int count;
public B() { // constructor
public void increment() {
    count++;
public class A {
public static void main(String args[]) {
    B b = new B();
    b.increment();
}Is this what you were asking?

Insert data into table from JSP page using Entity Beans(EJB 3.0)

I want to insert data into a database table from JSP page using Entity Beans(EJB 3.0).
1. I have a table 'FRIENDS', (in Oracle 10g database).
2. It has two columns, 'NAME' and 'CITY'. Both have datatype strings(varchar2).
3. Now from a JSP page, having two textfields, 'NAME' and 'CITY', I want to insert data into table 'FRIENDS'.
4. In between JSP and database is a Entity Bean(EJB 3.0) and a stateless session bean.
5. I am using JDev as editor.
Please provide me code ASAP or link with similar example.
Thank you.
Anurag

Hi,
I am also trying that scenario. So u can
Post the jsp form data to a Servlet which will act as a Controller.
In the servlet invoke the business method.
Similar kind of app is in www.roseindia.net
Hope this would help u.
Meanwhile if u get any optimal solution, pls post it.
Thanks,
Happy Java Coding.

After updating my iPad recently, I can no longer use it to present PPTs using a TV monitor that always previously worked. The display mentions something about using AirPlay which I am not using or trying to. Suggestions please?

After updating my iPad recently, I can no longer use it to present PPTs using a TV monitor that always previously worked. The display mentions something about using AirPlay which I am not using or trying to. Suggestions please? I am currently using iOs 7.0 on this iPad and I never had a lick of trouble until aetr this update. Anything would help. Thanks.

I'm adding screen shots taken from this afternoon showing connection that varied from non-existent to 1X.

How am I able to use an injected EJB in a Managed Bean Constructor?

JSF 1.2
EJB 3.0
Glassfish v1
Summary:
Managed bean injected EJB is null when referencing EJB var in constructor.
Details:
In my managed bean, I have a constructor that tries to reference an injected EJB, such as:
public class CustomerBean implements Serializable {
@EJB private CustomerSessionRemote customerSessionRemote;
public CustomerBean() {
List<CustomerRow> results = customerSessionRemote.getCustomerList();
}The call within the constructor to customerSessionRemote is null - I've double checked this in Netbeans 5.5.
How am I able to use an injected EJB in a Managed Bean Constructor?
Thanks,
--Todd

OK, I was reading the article Web Tier to Go With Java EE 5: A Look at Resource Injection and I understand your statement too.
Is there any way possible to Inject the EJB prior to the bean instance creation at all?
Maybe, I need to approach it with the old fashion Java EE 1.4 route and using JNDI in the PostConstruct annotated method to reference the EJB in the managed bean.
This had to been thought out before, I don't understand why a manged bean's life cycle places any injections at the end of the bean creation.
Also, now that I understand that the @PostConstruct annotated method will be called by the container after the bean has been constructed and before any business methods of the bean are executed.
I am trying to reference my EJB as part of the creation of the managed bean.
What happens: the JSF page loads the managed bean and I need to populate a listbox component with data from an EJB.
When I try to make the call to the EJB in the listbox setter method, the EJB reference is null.
Now, I'm not for sure if the @PostConstruct annotation is going to work... hmmmm.
** Figured it out. ** I just needed to move the EJB logic that was still in the setter of the component I wanted to populate into the annotated PostConstruct method.

Advice about using the laptop with closed lid while connected to external display

Hello all HP forum members!
I have an ENVY 17 with Win8.1 64bit, a great laptop, but I need an advice about using it while connected via HDMI cable to an external display (TV).
When I play heavy 3D games, the computer produces more heat than usual (of course this is normal), but doing so with closed lid, could this harm the display in some way, as a result of the heat?
Thanks!

Hi @VVel ,
Thank you for visiting the HP Support Forums and Welcome. It is a great site for information and questions. I have looked into your issue about your HP ENVY 17 Notebook and issue with keeping the Notebook on while closing the lid. Here is a document on changing the Power option.
Control Panel - Power Options - upper left - Choose what closing the lid does.
Change Plan Settings and also check Advanced Settings. Make sure you do this for both battery and power.
Hope this helps.
Thanks.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

About using SessionContext in EJB

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