Query Regarding Java FAQ

Hello friends,
Please refer me the java FAQ book which is latest and its writer also so that I can prepare interview questions as per industry standards....!
Your help can make my career better.....
Have a nice day.
Thanks and regards.....
Satyanand Verma
Noida, India.

Hai,
Check the below link.....
Re: Installation Requirements for WAS - Java Stack
Regards,
Yoganand.V

Similar Messages

Query regarding Java 640 installation

Hi All,
My team has to Install the Java 6.40 SP 19 WAS and have no clue how to do that. In market place what should be the point of start, we dont have much Idea.
I request you to kindly answer few of my questions. They are as follows.
1) We are using windows XP professional, in that case,from market place what should be components that we need to download for installing Java 6.40 SP 19.
2) What should be the steps that the team should take to install the WAS.
3) Once the WAS is installed we need to also install the Portal component for the same. In that case what should be the steps followed.
Please let me know if you need any additional information.
Regards
DK

Hai,
Check the below link.....
Re: Installation Requirements for WAS - Java Stack
Regards,
Yoganand.V

Query regarding java embedding activity in Oracle SOA Suite 11g

Hi,
Recently I've come across a scenario in my project. I've got a BPEL process with a java embedding activity. Now that java embedding activity calls a java class similar to the code below :-
>ArrayList<MyData> data=MSExcelParser.getData();
Now, after getting this data inside the java embedding, I need to populate a BPEL variable. The BPEL variable is based on an XSD element "BPELVariable" which looks something like the below snippet :-
><xsd:element name="BPELVariable" type="BPELVariableType"/>
> <xsd:complexType name="BPELVariableType">
> <xsd:sequence>
> <xsd:element name="MyData" type="MyDataType" maxouccurs="unbounded"/>
> </xsd:sequence>
></xsd:complexType>
So the BPEL variable that I want to populate can contain multiple "MyData" tags. Now my question is how can I populate the variable from my java embedding activity once I've got the list. Is it possible?
Thanks,
Rahul

I think we can exchange only data types, i dont see any data type which can hold the object types.
If you find anything better let us know.
Constructing string xml and converting to xml is best option i can think of.
Thanks,
Vijay

Eclipse query regarding Java Projects.

hi
sorry about this query regd eclipe 3.3.1
i have a folder on my c:\ called xips which contains 2 folders called xip1,xip2 which are project files.
I need to import the above 2 projects in my eclipse under a new project called A20
I create a new project in eclipse 3.3 called A20,then
Create project from existing source
Browse
Go to xips\xip1
Click ok
And eclipse goes to work.Now,how do I now import the project xip2 under A20
Is there a way I can create a project called A20,then import both the project xip1 and xip2 together
Please guide and apologies for asking thie query here

Just add it to the project's classpath (build path) or use project references.
In the future, use the mailinglist over there at Eclipse.org. Or just read its documentation/tutorials.

Query regarding updation thru a Procedure

Hi,I have a query regarding updation.
1.I invoke a procedure in Oracle called submit thru my Java application.
The submit procedure saves the XML data in the database
and displays this data in a Front End GUI.
2. Now,I make a change in my Java application by adding new elements to the same row.This row now contains additional XML elements.
I would like to display the new row with the new elements in the GUI.
What is a better option for doing the above?
1.Delete the row being shown,save the new row with the changes in the database,and re display it?
2.Or,Update the row dynamically and refresh?
Any suggestions
Thanks,

Hi,I have a query regarding updation.
1.I invoke a procedure in Oracle called submit thru
my Java application.
The submit procedure saves the XML data in the
database
and displays this data in a Front End GUI.
2. Now,I make a change in my Java application by
adding new elements to the same row.This row now
contains additional XML elements.
I would like to display the new row with the new
elements in the GUI.
What is a better option for doing the above?
1.Delete the row being shown,save the new row with
the changes in the database,and re display it?
2.Or,Update the row dynamically and refresh?
Any suggestions
Thanks,If you delete (it seems to me yours this process is regular and frequent) and re insert the new updated one record then High water mark will cause to scan yours table which may cause to degrade the performance.AFAIK you should go with update.But hold down dont implement it as i suggested lets see what are others solution here which may be more precious then mine.
Khurram

A query regarding synchronised functions, using shared object

Hi all.
I have this little query, regarding the functions that are synchronised, based on accessing the lock to the object, which is being used for synchronizing.
Ok, I will clear myself with the following example :
class First
int a;
static int b;
public void func_one()
synchronized((Integer) a)
{ // function logic
} // End of func_one
public void func_two()
synchronized((Integer) b)
{ / function logic
} // End of func_two
public static void func_three()
synchronized((Integer) a)
{ // function logic
} // End of func_three, WHICH IS ACTUALLY NOT ALLOWED,
// just written here for completeness.
public static void func_four()
synchronized((Integer) b)
{ / function logic
} // End of func_four
First obj1 = new First();
First obj2 = new First();
Note that the four functions are different on the following criteria :
a) Whether the function is static or non-static.
b) Whether the object on which synchronization is based is a static, or a non-static member of the class.
Now, first my-thoughts; kindly correct me if I am wrong :
a) In case 1, we have a non-static function, synchronized on a non-static object. Thus, effectively, there is no-synchronisation, since in case obj1 and obj2 happen to call the func_one at the same time, obj1 will obtain lock for obj1.a; and obj2 will obtain lock to obj2.a; and both can go inside the supposed-to-be-synchronized-function-but-actually-is-not merrily.
Kindly correct me I am wrong anywhere in the above.
b) In case 2, we have a non-static function, synchronized on a static object. Here, again if obj1, and obj2 happen to call the function at the same time, obj1 will try to obtain lock for obj1.a; while obj2 will try to obtain lock for obj2.a. However, since obj1.a and obj2.a are the same, thus we will indeed obtain sychronisation.
Kindly correct me I am wrong anywhere in the above.
c) In case 3, we have a static function , synchronized on a non-static object. However, Java does not allow functions of this type, so we may safely move forward.
d) In case 4, we have a static function, synchronized on a static object.
Here, again if obj1, and obj2 happen to call the function at the same time, obj1 will try to obtain lock for obj1.a; while obj2 will try to obtain lock for obj2.a. However, since obj1.a and obj2.a are the same, thus we will indeed obtain sychronisation. But we are only partly done for this case.
First, Kindly correct me I am wrong anywhere in the above.
Now, I have a query : what happens if the call is made in a classically static manner, i.e. using the statement "First.func_four;".
Another query : so far we have been assuming that the only objects contending for the synchronized function are obj1, and obj2, in a single thread. Now, consider this, suppose we have the same reference obj1, in two threads, and the call "obj1.func_four;" happens to occur at the same time from each of these threads. Thus, we have obj1 rying to obtain lock for obj1.a; and again obj1 trying to obtain lock for obj1.a, which are the same locks. So, if obj1.a of the first thread obtains the lock, then it will enter the function no-doubt, but the call from the second thread will also succeed. Thus, effectively, our synchronisation is broken.
Or am I being dumb ?
Looking forward to replies..
Ashutosh

a) In case 1, we have a non-static function, synchronized on a non-static object. Thus, effectively, there is no-synchronisationThere is no synchronization between distinct First objects, but that's what you specified. Apart from the coding bug noted below, there would be synchronization between different threads using the same instance of First.
b) In case 2, we have a non-static function, synchronized on a static object. Here, again if obj1, and obj2 happen to call the function at the same time, obj1 will try to obtain lock for obj1.a; while obj2 will try to obtain lock for obj2.a.obj1/2 don't call methods or try to obtain locks. The two different threads do that. And you mean First.b, not obj1.b and obj2.b, but see also below.
d) In case 4, we have a static function, synchronized on a static object. Here, again if obj1, and obj2 happen to call the function at the same time, obj1 will try to obtain lock for obj1.a; while obj2 will try to obtain lock for obj2.a.Again, obj1/2 don't call methods or try to obtain locks. The two different threads do that. And again, you mean First.b. obj1.b and obj2.b are the same as First.b. Does that make it clearer?
Now, I have a query : what happens if the call is made in a classically static manner, i.e. using the statement "First.func_four;".That's what happens in any case whether you write obj1.func_four(), obj2.func)four(), or First.func_four(). All these are identical when func_four(0 is static.
Now, consider this, suppose we have the same reference obj1, in two threads, and the call "obj1.func_four;" happens to occur at the same time from each of these threads. Thus, we have obj1 rying to obtain lock for obj1.aNo we don't, we have a thread trying to obtain the lock on First.b.
and again obj1 trying to obtain lock for obj1.aYou mean obj2 and First.b, but obj2 doesn't obtain the lock, the thread does.
which are the same locks. So, if obj1.a of the first thread obtains the lock, then it will enter the function no-doubt, but the call from the second thread will also succeed.Of course it won't. Your reasoning here makes zero sense..Once First.b is locked it is locked. End of story.
Thus, effectively, our synchronisation is broken.No it isn't. The second thread will wait on the same First.b object that the first thread has locked.
However in any case you have a much bigger problem here. You're autoboxing your local 'int' variable to a possibly brand-new Integer object every call, so there may be no synchronization at all.
You need:
Object a = new Object();
static Object b = new Object();

Error occurred while sending query result: 'java.lang.NullPointerException'

I am doing end to end scenario from SQL server to File
JDBC --XI -- File
I am getting the following Error while monitoring the sender CC in RWB
"Error occurred while sending query result: 'java.lang.NullPointerException'
Please Help !!

Hi,
To see the Adapter Error log, try:
http://<XiServerHostName>:<J2EE-Port>/MessagingSystem
Try viewing the Audit Log for each message (Newspaper Icon)
Regards,
Amitabha

Query regarding using JNI in linux

Hi
I have a query regarding JNI.We have a situation in which
we have some c programmes and we want to call that c programme method in my java code. The problem is that in JNI the native code signature should match the signature of the method of the header file generated by javah. We donot want to change the signature of the native code since it is hard to debug.So please suggest me a way out that i can call the native method without changing the signature of the native code.Please if u could give me some few simple example
Thanking u

So please suggest me a way out that i can call the native method without changing the signature of the native code.You write a wrapper. Your java JNI class has methods. Those methods are written in C by you. Those methods are new code. Those methods call your existing C methods.
Please if u could give me some few simple example.http://java.sun.com/docs/books/tutorial/native1.1/index.html

BEx Query from Java

Hi
Can I call a BEx Query from Java . If yes, in what format data will be returned? We just need data, we want to structure it in Java for display in a Flex UI.
Please note that I have very limited knowledge of both Java and BI.
Thanks in advance for your help.
Best Regards
Saurabh

Hi,
Yes you can. It will be contained in a web template.
Please read through the link below and the related links contained within.
http://help.sap.com/saphelp_nw70ehp1/helpdata/en/0d/af12403dbedd5fe10000000a155106/frameset.htm
Thanks,
Michael
Edited by: Michael Devine on May 25, 2010 3:40 PM

Query regarding updating rows in JTable

Query regarding updating rows in JTable
Hello,
I have a JTable with 6 columns and 1000s of rows (which are data read from flat files)
I can select 1 or more rows and change the values of the
columns. each time I do this I need to update the values
in the flat file.
Currently I assign the updated Jtable values to a vector
Vector rowVector = (Vector)defaultModel.getDataVector();
then I iterate over the vector and compare the values with the (old) data
in the JTable.
            for(int rowCount = 0; rowCount<rowVector.size(); rowCount++){
                Vector v = (Vector)rowVector.elementAt(rowCount);
                    //smsList is the Vector that contains the old JTable values
                    for(int i=0; i<smsList.size(); i++){
                            //If colums values have been changed; add that
                            //vector value to another vector
                            selectedsmsList.add(smsList.get(i));
            for(int i=0; i<selectedsmsList.size(); i++){
                     //Update the values in the flat file
            }This works fine except that it takes ages to iterate over the updated vecor and un-updated,old vector; is there any way to directly get the list of rows that were updated in the jtable; so that I can directly do an I/O operation to update the jtablke values?

Just a suggestion.
You could add a listener and use a vector of booleans to keep track of the rows that have been changed. You could then iterate through this boolean vector and update the changed rows.
See
http://java.sun.com/docs/books/tutorial/uiswing/components/table.html#modelchange
Don't know whether this will be helpful.
Regards, Darryl

Query regarding the Node manager configuration(WLS and OAM Managed server)

Query regarding the Node manager configuration(WLS and OAM Managed server):
1) In the nodemanager.properties I have added the ListenAddress:myMachineName and ListenPort: 5556
My setup : One physical Linux machine(myMachineName) has : WLS admin server, managed server(OAM 11G) and nodemanager.No clustered environment.
2) nodemanager.log has the following exception when I start the oam_server1 using EM(Enterprise Manager11g):
Mar 23 2012 1:39:55 AM> <SEVERE> <Fatal error in node manager server>
java.net.BindException: Address already in use
at java.net.PlainSocketImpl.socketBind(Native Method)
at java.net.AbstractPlainSocketImpl.bind(AbstractPlainSocketImpl.java:336)
at java.net.ServerSocket.bind(ServerSocket.java:336)
at javax.net.ssl.impl.SSLServerSocketImpl.bind(Unknown Source)
at java.net.ServerSocket.<init>(ServerSocket.java:202)
at javax.net.ssl.SSLServerSocket.<init>(SSLServerSocket.java:125)
at javax.net.ssl.impl.SSLServerSocketImpl.<init>(Unknown Source)
at javax.net.ssl.impl.SSLServerSocketFactoryImpl.createServerSocket(Unknown Source)
Default port on which node manager listen for requests is localhost:5556.I have changed it to point to my machine. The port should be of WLS admin server or it should be the managed server port?
3) I have started the NodeManager using the startNodeManager.sh script.
4) The admin server port is 7001 and the oam managed server port is 14100.
Any inputs on what might be wrong in the setup will be helpful.Thanks !

By using netstat -anp|grep 5556 you can check which process on your machine is using the 5556 port.

A Query regarding 'Events' published and 'Event' subscribed

I have a query regarding 'Events' and 'EventHandling' in Java Swing.
Swing in an EVENT based application whereby 'events' are generated
by interacting with the components.
Eg: Clicking on a Button generates an 'ActionEvent' and every event
generated has an associated 'EventListener'.
Now,my question is:
a)When an event is generated,(let's say by clicking a button),
an 'event' is published,right?
That means that there is an 'Event Publisher'.
In the above case,the Button is the 'Publisher' of the event,right?
b) Who are the subscribers for the events generated?
Where do we specify the 'subscibers' to the events generated?(and once
the subscribers get the Event,the subscriber will call the methods
of the event object)
We just say
   addButton.addActionListener(new ButtonHandler);
   private class ButtonHandler implements ActionListener {
        public void actionPerformed(ActionEvent e){
In the above code :
a) Who is the Event Publisher?
b) Who is the Event Subscriber?
No offence meant for the question.

The 'event publisher' for the mouse click is the ToolKit implementation (translates the OS mouse event to a Java mouse event).
The 'event subscriber' for the mouse click on a button is typically a ButtonUI (you can add a mouse listener directly though).
The 'event publisher' for the action event is the ButtonModel (notified by the ButtonUI when the button is unpressed, etc).
The 'event subscriber' for the action event are the action listeners.

How to use sql query in java ?

i don't know how to use sql query in java code.
who can give me some advice?
thanks

http://java.sun.com/developer/onlineTraining/Database/JDBC20Intro/

Query regarding the conversion of DME file in MT940 format.

Hello Experts,
I have a query regarding the generation of MT940 file after generating the payment file from other DME tree.
After completion of payment run, my payment file is generated in the DME format which is according to the DME tree.
I want to convert the DME file (which is generated via F110) from existing format to the standard MT940 format.
Is there any standard program which converts the DME file to MT940. If so, please inform me as early.
I have tried to upload the DME file in FF.5 transaction, but it is not allowing me to convert the file in MT940 structure.
Or please inform the steps how i can convert the file .
Awaiting for your inputs.
Thanks in advance

Hi Zareena.
I would like to suggest,
SX_OBJECT_CONVERT_RAW_TXT.
Hope that's usefull.
Good Luck & Regards.
Harsh Dave

Query regarding the data type for fetcing records from multiple ODS tables

hey guys;
i have a query regarding the data type for fetcing records from multiple ODS tables.
if i have 2 table with a same column name then in the datatype under parent row node i cant add 2 nodes with the same name.
can any one help with some suggestion.

Hi Mudit,
One option would be to go as mentioned by Padamja , prefxing the table name to the column name or another would be to use the AS keyoword in your SQL statement.
AS is used to rename the column name when data is being selected from your DB.
So, the query Select ename as empname from emptable will return the data with column name as empname.
Regards,
Bhavesh

Query Regarding Java FAQ

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