Vector and session object...

Hi, I have a JSP that retrieves a resultset with 3000+ rows. I use that resultset to create a summary page of grouped data, so the resulting page is only a few lines. Each group is a link that can be double clicked to call a JSP that will display the detail line items.
From a developers viewpoint, this is how I'm doing it: On the first JSP, as I scan through the resultset creating the summary line items I add the detail data to a vector. After I'm done processing the resultset I add the vector to the session object. When the hyperlink on the first JSP is activated I call a second JSP that retreives the vector from the session object and display the results.
Is that a good idea or a bad idea? It seems to work ok, but I'm thinking it might be alot of data to be storing on a session object especially when you consider the number of users that could be on. Is there a way to compress the vector when I add it to the session object? Is there a better way to do this? Unfortunately, I can't re-retrieve the data because the SQL takes too long. Thanks!

Sure you could compress it... you could use the classes in java.util.zip, and use an ObjectOutputStream plus a ZipOutputStream plus a ByteArrayOutputStream (I think), using zip compression to convert your Vector into an array of bytes, and then do the reverse when you needed the data uncompressed. Chances are that would compress your data by about 80 or 90%.
Here you would be making the classic tradeoff between memory usage and processing time; I wouldn't do this compression thing until it was clear that it was necessary, though.

Similar Messages

Vector and my object??

hi all,
I am reading a binary file, then creating the object and adding that object in my vector. How can i get it back according to its id? let is say i added all the customers read from file and now i want to get customer 3?
int thisId=dis.readInt();
String thisName=dis.readUTF();
double thisBalance=dis.readDouble();
Customer cus=new Customer(thisName,thisId,thisBalance);
cusList.add(cus);
abdul

Best possible way is to use Hashtable and put customerid as key and Customer object
as value.
Modify your code with,
Customer cus=new Customer(thisName,thisId,thisBalance);
some-hashtable-object.put(thisId,cus);
now if you want to take particular Customer
use
Customer c = (Customer)some-hashtable-object.get(any customerid);
Now if you don't want to use Hashtable and continue with Vector then you have to iterate the,
Vector and whether object has id 3 .
like
for(int i=0;i<Vectorobject.size();i++){
Customer c = (Customer) Vectorobject.get(i);
id = c.getCustomerId() // or any method you have to get id;
// check it....
But i think Hashtable is the better way to use here.
I think you understand what i want to say .
Tarak.

How ServletContext and Session object differ in a Serlet

Both ServletContext and Session allows storing objects as a name value pair set and they can be accessed across several servlets/JSP's. How do they differ?

Hi
The Main difference is their visibility or rather the scope of the varibles differs depending on whether they are stored in the session or the Servlet Context.
When you say that an Object is stored in the session then it means that the Object is available to the application for duration of the particulars user's session i.e. as long as the user's session is active the Object is available though not for others who will have a different session and so will not be able to access this information.
Whereas, when you add the Object to Servlet Context you are setting up the object to be visible throughout the application for duration of the application itself and for any component that is art of the application
So if we have a list of Object storage/sharing mechanisms listed in descending order of object life span/visibility then we have:
Application - ServletContext
Session - HttpSession
Request - ServletRequest
Page
Keep me posted on your progress.
Good Luck!
Eshwar Rao
Developer Technical Support
Sun microsystems
http://www.sun.com/developers/support

Photoshop Vectors and Smart Objects Create Blurring

I have been supplied a Photoshop document that has Illustrator Vector files that have been placed in the PSD as Smart objects.
When I bring the PSD into InDesign and print it, all the PSD artwork is blurry.
How can I get the PSD file to print from InDesign at high quality.
The PSD file is at 300 dpi. I have tried bringing it into InDesign as PSD, TIFF, EPS & PDF, but it's the same issue every time.

Here is your screenshots

I created a vector and added objects, but the vector is empty

I created an object called a facility, it accepts 2 strings in the creator but stores the data as a string and a float. as you can see from the code below, i have tried to create a vector object to contain facilitys and named it entries. when i add objects to this vector, the vectors size does not change, and i cannot access elements of it via their index. but when i print the vector out i can see the elements? what is going on here. i am very confused. ps, if it helps i havent worked with vectors much before.
FacilitysTest.java
import java.util.*;
public class FacilitysTest {
     public static void main (String [] args) {
     Facilitys entries = new Facilitys();
     entries.add("Stage","3.56");
     entries.add("kitchen","5.00");
     entries.add("heating","2");
//     System.out.println(entries.firstElement() );
     System.out.println("printing out entries");
     System.out.println(entries);
     System.out.println();
     System.out.println("There are "+entries.size()+" entries");
     System.out.println();
     System.out.println("modifying entry 2");
     entries.setElementAt(new Facility("lighting","1.34"), 2);
     System.out.println(entries);
     System.out.println();
     System.out.println("deleting entry 1");
     entries.remove(1);
     System.out.println(entries);
}the following is what happens when i run this code.
the number (0,1,2) is taken from a unique number assigned to the facility and is not anything to do with the facilitys position in the vector.
printing out entries
Facility number: 0, Name: Stage , Cost/Hour: 3.56
Facility number: 1, Name: kitchen , Cost/Hour: 5.0
Facility number: 2, Name: heating , Cost/Hour: 2.0
There are 0 entries
modifying entry 2
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2 >= 0
at java.util.Vector.setElementAt(Vector.java:489)
at FacilitysTest.main(FacilitysTest.java:17)
Press any key to continue . . .
Facilitys.java
import java.util.*;
public class Facilitys extends Vector {
     private Vector entries;
     public Facilitys( ) {
             entries = new Vector();
    public void add( String name, String price ) {
         entries.add((new Facility( name, price) ));
    public Facility get(int index) {
          return ((Facility)entries.get(index));
     public float total() {
          float total = 0;
          for (int i = 0; i<entries.size();i++) {
               total = total + ( (Facility)entries.get(i) ).getPricePerHour();
          return total;
    public String toString( ) {
        StringBuffer temp = new StringBuffer();
        for (int i = 0; i < entries.size(); ++i) {
            temp.append( entries.get(i).toString() + "\n" );
        return temp.toString();
}

are you reffering to where i have public class
Facilitys extends Vector {
     private Vector entries;
     public Facilitys( ) {
             entries = new Vector();
That's correct. That's your problem.
i added the extends Vector, because without it i got
the following errors
C:\Documents and Settings\george\My
Documents\University\JavaCode\CM0112\FacilitysTest.jav
a:14: cannot find symbol
symbol : method size()
location: class Facilitys
System.out.println("There are "+entries.size()+"
" entries");That's because you haven't implemented a size method in your class.
^
C:\Documents and Settings\george\My
Documents\University\JavaCode\CM0112\FacilitysTest.jav
a:17: cannot find symbol
symbol : method setElementAt(Facility,int)
location: class Facilitys
entries.setElementAt(new
w Facility("lighting","1.34"), 2);That's because you haven't implemented setElementAt in your class.
C:\Documents and Settings\george\My
Documents\University\JavaCode\CM0112\FacilitysTest.jav
a:21: cannot find symbol
symbol : method remove(int)
location: class Facilitys
     entries.remove(1);
^That's because you haven't implemented remove in your class.
/Kaj

How to get Request/Session objects in a Webdynpro application

Hi
I am working in Enterprise Portal 7.0.
in one of the iViews which displays a JSP page, i have set a parameter in request and session objects.
How can i get it in my Webdynpro ABAP Application?
Thanks & Regards
Abhimanyu L

hi Abhimanyu
I believe originally access to session was deliberately not made available inside WDA.
Growing security concerns due to misuse of session information and
perhaps other reasons as well.
X.509 is considered a better approach.
This may not help you in your problem.
But you may see a trend in WDA pushing more robust and client independent
approaches.
Full x.509 access should remove the need for session fiddling.
Also when developers access such session info directly, there is a possiblity
when they dont understand the technology exactly that they create a security hole.
You may know how to do safely, it is however discouraged.
Im not aware of a way to get at the session info inside the WDA framework.
Well not without a mod to the framework.
It may be possible without a mod, but I dont know the trick.
If someone has a little trick... please post.
You may need to use BSP, if your only solution requires access to the session info.
regards
Phil

How to combine Session Facade and Transfer object?

Hello All!
I'm working on an enterprise application. Presentation layer is a stand alone client, business logic is build on the Glassfish v2.1 and MySQL is used as a database. The client is connection to the GlassFishj server remotely using EJBs.
I have problems with business logic architecture.
Here is the brief description of backend application architecture design:
1. Session Facade pattern is used to simplify the client and application server interface and to provide application layers between backend (http://java.sun.com/blueprints/corej2eepatterns/Patterns/SessionFacade.html).
2.Transfer Object pattern to define update transfer objects strategy in order to decrease network overhead during client and application server interactions and to provide version control for objects. Transfer objects are designed as simple java business serializable objects. (http://java.sun.com/blueprints/corej2eepatterns/Patterns/TransferObject.html)
3. Originally the backend application consisted of three modules: users, storage and orders, but at the end I have decided to divide my application into the following parts - assortments, map, menu, orders, transactions, users.
4. All MySQL database transactions are via JDBC using procedures. No use of entity beans.
Questions:
1. I have some doubts about using Session Facade and Transfer object patterns at the same time. At first I'd mike to cite the definitions of the patters from the SUN official web site.
* Use a session bean as a facade to encapsulate the complexity of interactions between the business objects participating in a workflow. The Session Facade manages the business objects, and provides a uniform coarse-grained service access layer to clients.
* Use a Transfer Object to encapsulate the business data. A single method call is used to send and retrieve the Transfer Object. When the client requests the enterprise bean for the business data, the enterprise bean can construct the Transfer Object, populate it with its attribute values, and pass it by value to the client.
* So, if I use Transfer Object along with Session Facade, it makes some difficulties with object version control, because I 2 or
3 transfer objects controls with the 1 bean class. The best option for Transfer object Pattern is that each transfer object should have its own bean class to provide ability of object's version control. In the case it can bring the network overhead because of frequent remote calls caused by the large number of the bean classes.
* So, should I use the both patterns? If yes, how to manage the interaction the patterns. If no, which one to use.
2. E.g. I have a huge list of the Order objects and each Order object consists of other complicated objects. So, would I have trouble to transfer that list over network? If yes, how to manage it.
Thank you!
Astghik

Astghik wrote:
Hello All!
I'm working on an enterprise application. Presentation layer is a stand alone client, business logic is build on the Glassfish v2.1 and MySQL is used as a database. The client is connection to the GlassFishj server remotely using EJBs.
I have problems with business logic architecture.
Here is the brief description of backend application architecture design:
1. Session Facade pattern is used to simplify the client and application server interface and to provide application layers between backend (http://java.sun.com/blueprints/corej2eepatterns/Patterns/SessionFacade.html).
I would simply recommend establishing a service tier. Your services should be stateless. You can go the extra mile and have a session facade, but in the majority of cases, coding to an interface for your service accomplishes the same goals.
2.Transfer Object pattern to define update transfer objects strategy in order to decrease network overhead during client and application server interactions and to provide version control for objects. Transfer objects are designed as simple java business serializable objects. (http://java.sun.com/blueprints/corej2eepatterns/Patterns/TransferObject.html)
The idea of the transfer object is very similar to the Command pattern. I think if you investigate that pattern, it will be more obvious. The transfer object reduces network latency by consolidating all the parameters into an object, ideally, this also consolidates multiple method calls. If you combine a transfer object (or command object) with a service tier, you get the best of both worlds. The service can delegate calls to helper objects (or other services or components) using the data in the transfer / command object.
3. Originally the backend application consisted of three modules: users, storage and orders, but at the end I have decided to divide my application into the following parts - assortments, map, menu, orders, transactions, users.
The is your domain. It will vary from application to application. The principles above are more general (e.g., patterns and architectural tiers) and should apply to most domains. However, your actual use case may require something different.
4. All MySQL database transactions are via JDBC using procedures. No use of entity beans.
Consider using something like iBatis or Spring's JDBC templating to make your life easier with JDBC.
Questions:
1. I have some doubts about using Session Facade and Transfer object patterns at the same time. At first I'd mike to cite the definitions of the patters from the SUN official web site.
* Use a session bean as a facade to encapsulate the complexity of interactions between the business objects participating in a workflow. The Session Facade manages the business objects, and provides a uniform coarse-grained service access layer to clients.
* Use a Transfer Object to encapsulate the business data. A single method call is used to send and retrieve the Transfer Object. When the client requests the enterprise bean for the business data, the enterprise bean can construct the Transfer Object, populate it with its attribute values, and pass it by value to the client.
* So, if I use Transfer Object along with Session Facade, it makes some difficulties with object version control, because I 2 or
3 transfer objects controls with the 1 bean class. The best option for Transfer object Pattern is that each transfer object should have its own bean class to provide ability of object's version control. In the case it can bring the network overhead because of frequent remote calls caused by the large number of the bean classes.
* So, should I use the both patterns? If yes, how to manage the interaction the patterns. If no, which one to use.
Versioning is a separate issue. Generally, the more coarsely grained your transfer / command object is, the more changes are likely to impact dependent objects.
Your command or transfer object does not have to be a vanilla JavaBean, where you are basically creating a bean that has data from other objects. You can simply use your command / transfer object to encapsulate already existing domain objects. I see no need to map to a JavaBean with what you have described.
Generally, a method signature should be understandable. This means that many times it is better to pass the method, say, two coarsely grained objects than a signature with a dozen primitives. There are no hard and fast rules here. If you find a method signature getting large, consider a transfer / command object. If you want one service to delegate calls to a number of other services, you can also create a transfer / command object to furnish the controlling service with the data it needs to invoke the dependent services.
2. E.g. I have a huge list of the Order objects and each Order object consists of other complicated objects. So, would I have trouble to transfer that list over network? If yes, how to manage it.
This is a large, open-ended question. If you are going to display it to a user on a screen, I do not see how you avoid a network transfer with the data. The general answer is to not pass the data itself but rather a token (such as a primary key, or a primary key and a start and stop range such as you see on a Google search result). You do want to limit the data over the network, but this comes at a cost. Usually, the database will receive additional load. Once that becomes unacceptable, you might start putting things into session. Then you worry about memory concerns, etc. There is no silver bullet to the problem. It depends on what issues you are trying to address and what trade-offs are acceptable in your environment.
Thank you!
AstghikBest of luck.
- Saish

URGENT! Share session object in JSP and JServlet

Dear all,
I am new to OAS. I am now trying OAS by build a simple Shopping Cart application.
Currently, I use JSP to build user interface and Servlet to build bussiness logic. So I use JSP cartage and JServlet cartage to build the application.
However, I find that the "session object" I create in the JSP cannot be access from Servlet cartage.
Is anyone can help me to solve this problem. ( Is this implementation framework works in OAS ? )

>
I am short describing the problem again,
IN JSP, MY CODE IS LIKE THIS:
HttpSession oSession=request.getSession(true);
oSession.setAttribute("batchHash",reqRows);
IN SERVLET, MY CODE IS LIKE THIS:
HttpSession oSession=req.getSession(true);
tblSession = (Hashtable)
oSession.getAttribute("batchHash");
System.out.println("IsNew ="+oSession.isNew());
System.out.println("Object="+prmSSO);
If I deploy this in TOMCAT, my output is like this:
IsNew =false
Object=Hashtable@982fc1
If I deploy this in WEBLOGIC 6.1, my output is like
this:
IsNew =true
Object=null
Why is this?
Why the "oSession.isNew()" returns "false" in tomcat
and "true" in weblogic ?
Please help....Your only problem is using
HttpSession oSession=req.getSession(true);instead of
HttpSession oSession=req.getSession(false);in your servlet! getSession(true) - forces to allocate new session,
so it's absolutely clear why your Hashtable is absent in
a newly created session!!
Paul

Problem when adding java objects in a vector and passing thru web service

Hi! I'm getting this error when I try to add a java object I created into a vector and passing it through a web service: java.lang.IllegalArgumentException: No Serializer found to serialize a 'testObj' using encoding style 'http://schemas.xmlsoap.org/soap/encoding/'
This does not happen when I simply add strings or Integer objects into the vector. What am I missing?
Thanks.

just chek this
http://forum.java.sun.com/thread.jspa?threadID=501189&messageID=2370914
Edited by: garava on Jul 16, 2008 1:13 PM.
It would be great if you could paste the wsdl part for that vector and just have a look for the complex typr cntent
like for HashMap we have the following mapping
<complexType name="HashMap">
<sequence>
    <element name="item" minOccurs="0" maxOccurs="unbounded">
      <complexType>
        <sequence>
          <element name="key" type="anyType" />
          <element name="value" type="anyType" />
        </sequence>
      </complexType>
    </element>
</sequence>
</complexType>Since in Value it should again contain a mapping for the Object which you are trying to pass then only an appropriate serializer and deserilaizer would get generated. Hope this answers your query. For refernece
http://www.theserverside.com/tt/articles/article.tss?l=Systinet-web-services-part-2
[http://www.theserverside.com/tt/articles/article.tss?l=Systinet-web-services-part-2|For refernce tutorial]
Thanks,
Avadhoot Sawant.
Edited by: garava on Jul 16, 2008 1:16 PM

How to get Multiple Values for a key from a session object?

Hi,
It might seem dumb but I am facing a problem here with the session object. I'll paste the session object's content from the netbeans "Local Variables" window for clarity -
Name Type Value
hsession StandardSessionFacade #66
session LWSFSession #69
inherited
attributes Hashtable #80
[0] Hashtable$Entry "cart"=>#115
key String "cart"
value DummyCart #115
item null
submit null
v Vector
[0] String Full Metal Jacket
[1] String As Good As It Gets
[2] String Tim
What I want is to get the values "Full Metal Jacket", "As Good As It Gets" and "Tim" from the session obejct?
The problem I am facing is that if I do a session.getAttribute("cart"), I'll get a single value in return. What will that value be? Will it be "item", "submit" or "v"? And if I want all the values in v above, how can I get them?
Thanks.

None of the above.
HttpSession.getAttribute() will return what you put into it using HttpSession.setAttribute(). In your case, it'll return an Object which you need to cast to DummyCart. Then you can access the data in DummyCart using the API of the DummyCart class.
hth

Javacard and session variables

Hello,
I'm trying to find a reasonable Javacard technique to handle "session variables" that must be kept between successive APDUs, but must be re-initialized on each card reset (and/or each time the application is selected); e.g. currently selected file, currently selected record, current session key, has the user PIN been verified...
Such variables are best held in RAM, since changing permanent (EEPROM or Flash) variables is so slow (and in the long run limiting the operational life of the card).
Examples in the Java Card Kit 2.2.2 (e.g. JavaPurseCrypto.java) manipulate session variables in the following way:
1) The programmers group session variables of basic type (Short, Byte, Boolean) according to type, and map each such variable at an explicit index of a vector (one per basic type used as session variable).
2) At install() time, each such vector, and each vector session variable, is explicitly allocated as a transient object, and this object is stored in a field of the application (in permanent memory), where it remains across resets.
3) Each use of a session variable of basic type is explicitly translated by the programmer into using the appropriately numbered element of the appropriate vector.
4) Vector session variables require no further syntactic juggling, but eat up an object descriptor worth of permanent data memory (EEPROM or Flash), and a function call + object affectation worth of applet-storage memory (EEPROM, Flash or ROM).
The preparatory phase goes:
public class MyApp extends Applet {
// transientShorts array indices
    final static byte      TN_IX = 0;
    final static byte      NEW_BALANCE_IX=(byte)TN_IX+1;
    final static byte      CURRENT_BALANCE_IX=(byte)NEW_BALANCE_IX+1;
    final static byte      AMOUNT_IX=(byte)CURRENT_BALANCE_IX+1;
    final static byte   TRANSACTION_TYPE_IX=(byte)AMOUNT_IX+1;
    final static byte     SELECTED_FILE_IX=(byte)TRANSACTION_TYPE_IX+1;
    final static byte   NUM_TRANSIENT_SHORTS=(byte)SELECTED_FILE_IX+1;
// transientBools array indices
    final static byte      TRANSACTION_INITIALIZED=0;
    final static byte      UPDATE_INITIALIZED=(byte)TRANSACTION_INITIALIZED+1;
    final static byte   NUM_TRANSIENT_BOOLS=(byte)UPDATE_INITIALIZED+1;
// remanent variables holding reference for transient variables
    private short[]     transientShorts;
    private boolean[]   transientBools;
    private byte[]      CAD_ID_array;
    private byte[]      byteArray8; // Signature work array
// install method
    public static void install( byte[] bArray, short bOffset, byte bLength ) {
         //Create transient objects.
        transientShorts = JCSystem.makeTransientShortArray( NUM_TRANSIENT_SHORTS,
            JCSystem.CLEAR_ON_DESELECT);
        transientBools = JCSystem.makeTransientBooleanArray( NUM_TRANSIENT_BOOLS,
            JCSystem.CLEAR_ON_DESELECT);
        CAD_ID_array = JCSystem.makeTransientByteArray( (short)4,
            JCSystem.CLEAR_ON_DESELECT);
        byteArray8 = JCSystem.makeTransientByteArray( (short)8,
            JCSystem.CLEAR_ON_DESELECT);
(..)and when it's time for usage, things go:
    if (transientShorts[SELECTED_FILE_IX] == (short)0)
        transientShorts[SELECTED_FILE_IX] == fid;
    transientBools[UPDATE_INITIALIZED] =
        sig.verify(MAC_buffer, (short)0, (short)10,
            byteArray8, START, SIGNATURE_LENGTH);I find this
a) Verbose and complex.
b) Error-prone: there is nothing to prevent the accidental use of transientShorts[UPDATE_INITIALIZED].
c) Wastefull of memory: each use of a basic-type state variable wastes some code; each vector state variable wastes an object-descriptor worth of permanent data memory, and code for its allocation.
d) Slow at runtime: each use of a "session variable", especially of a basic type, goes thru method invocation(s) which end up painfully slow (at least on some cards), to the point that for repeated uses, one often attain a nice speedup by caching a session variable, and/or transientShorts and the like, into local variables.
As an aside, I don't get if the true allocation of RAM occurs at install time (implying non-selected applications eat up RAM), or at application selection (implying hidden extra overhead).
I dream of an equivalent for the C idiom "struct of state variables". Are these issues discussed, in a Sun manual, or elsewhere? Is there a better way?
Other desperate questions: does a C compiler that output Javacard bytecode make sense/exists? Or a usable Javacard bytecode assembler?
Francois Grieu

Interesting post.
I don't have a solution to your problem, but caching the session variables arrays in local variable arrays is a good start. This should be only done when the applet is in context, e.g. selected or accessed through the shareable interface. This values should be written back to EEPROM at e.g. deselect or some other important point of time. Do you run into problems if a tear happens? I don't think so since the session variables should be transactional, and a defined point will commit a transaction.
Analyzing the bytecode is a good idea. I know of a view in JCOP Tools (Eclipse plugin) where you can analyze the bytecode and optimize it to your needs.

Saving Vector in session problem

Hi,
Im trying in my servlet to save vector into session and then retrive it:
// new vector
Vector VTree = new Vector();
// session
session = request.getSession(true);
//here I add some elements into vector VTree
VTree.size() // now using method size() I get number>0, so vector is not empty
// saving vector into session attribute SessionTree
session.setAttribute("SessionTree",VTree);
// then I clear vector VTree
VTree.clear();
// and Im trying to get vector from session, still in the same servlet, same method (doGet)
VTree = (Vector)session.getAttribute("SessionTree");
// and result, VTree.size() returns 0...
VTree.size()
Please help me, Im not possible to find error or bad expression...
Thanks, Jan

There are no errors. That is how Java works.
//here I add some elements into vector VTree
VTree.size() // now using method size() I get
number>0, so vector is not empty
// saving vector into session attribute SessionTree
session.setAttribute("SessionTree",VTree);You save a reference to that Vector in the session. So both your class and the session have a reference to the same Vector.
// then I clear vector VTree
VTree.clear();So you clear the Vector object. It has no elements now. Both your class and the session have a reference to this Vector, which is now empty.
// and Im trying to get vector from session, still in
the same servlet, same method (doGet)
VTree = (Vector)session.getAttribute("SessionTree");Now you get the reference to the (empty) Vector from the session and assign it to a variable in your class. (Your variable already had a reference to that same Vector.)
// and result, VTree.size() returns 0...
VTree.size()Yes, it does. Because you cleared the Vector earlier.
Remember, assigning a variable doesn't make a copy of an object. It just makes a copy of a reference (like a pointer) to the object.

Issues in persisting dynamic entity and view objects using MDS

Hi All,
I'm trying to create dynamic entity and view objects per user session and to persist these objects throughout the session, I'm trying to use MDS configurations(either file or Database) in adf-config.xml.
I'm facing following two errors while trying to run the app module:
1. MDS error (MetadataNotFoundException): MDS-00013: no metadata found for metadata object "/model/DynamicEntityGenModuleOperations.xml"
2. oracle.mds.exception.ReadOnlyStoreException: MDS-01273: The operation on the resource /sessiondef/dynamic/DynamicDeptEntityDef.xml failed because source metadata store mapped to the namespace / DEFAULT is read only.
I've gone through the following links which talks about the cause of the issue, but still can't figure out the issue in the code or the config file. Please help if, someone has faced a similar issue.
[http://docs.oracle.com/cd/E28271_01/doc.1111/e25450/mds_trouble.htm#BABIAGBG |http://docs.oracle.com/cd/E28271_01/doc.1111/e25450/mds_trouble.htm#BABIAGBG ]
[http://docs.oracle.com/cd/E16162_01/core.1112/e22506/chapter_mds_messages.htm|http://docs.oracle.com/cd/E16162_01/core.1112/e22506/chapter_mds_messages.htm]
Attached is the code for dynamic entity/view object generation and corresponding adf-config.xml used.
///////////App Module Implementation Class/////////////////////////
public class DynamicEntityGenModuleImpl extends ApplicationModuleImpl implements DynamicEntityGenModule {
private static final String DYNAMIC_DETP_VO_INSTANCE = "DynamicDeptVO";
* This is the default constructor (do not remove).
public DynamicEntityGenModuleImpl() {
public ViewObjectImpl getDepartmentsView1() {
return (ViewObjectImpl) findViewObject("DynamicDeptVO");
public void buildDynamicDeptComp() {
ViewObject internalDynamicVO = findViewObject(DYNAMIC_DETP_VO_INSTANCE);
if (internalDynamicVO != null) {
System.out.println("OK VO exists, return Defn- " + internalDynamicVO.getDefFullName());
return;
EntityDefImpl deptEntDef = buildDeptEntitySessionDef();
ViewDefImpl viewDef = buildDeptViewSessionDef(deptEntDef);
addViewToPdefApplicationModule(viewDef);
private EntityDefImpl buildDeptEntitySessionDef() {
try {
EntityDefImpl entDef = new EntityDefImpl(oracle.jbo.server.EntityDefImpl.DEF_SCOPE_SESSION, "DynamicDeptEntityDef");
entDef.setFullName(entDef.getBasePackage() + ".dynamic." + entDef.getName());
entDef.setName(entDef.getName());
System.out.println("Application Module Path name: " + getDefFullName());
System.out.println("EntDef :" + entDef.getFileName() + " : " + entDef.getBasePackage() + ".dynamic." + entDef.getName());
entDef.setAliasName(entDef.getName());
entDef.setSource("DEPT");
entDef.setSourceType("table");
entDef.addAttribute("ID", "ID", Integer.class, true, false, true);
entDef.addAttribute("Name", "NAME", String.class, false, false, true);
entDef.addAttribute("Location", "LOCATION", Integer.class, false, false, true);
entDef.resolveDefObject();
entDef.registerSessionDefObject();
entDef.writeXMLContents();
entDef.saveXMLContents();
return entDef;
} catch (Exception ex) {
System.out.println(ex.getLocalizedMessage());
return null;
private ViewDefImpl buildDeptViewSessionDef(EntityDefImpl entityDef) {
try {
ViewDefImpl viewDef = new oracle.jbo.server.ViewDefImpl(oracle.jbo.server.ViewDefImpl.DEF_SCOPE_SESSION, "DynamicDeptViewDef");
viewDef.setFullName(viewDef.getBasePackage() + ".dynamic." + viewDef.getName());
System.out.println("ViewDef :" + viewDef.getFileName());
viewDef.setUseGlueCode(false);
viewDef.setIterMode(RowIterator.ITER_MODE_LAST_PAGE_FULL);
viewDef.setBindingStyle(SQLBuilder.BINDING_STYLE_ORACLE_NAME);
viewDef.setSelectClauseFlags(ViewDefImpl.CLAUSE_GENERATE_RT);
viewDef.setFromClauseFlags(ViewDefImpl.CLAUSE_GENERATE_RT);
viewDef.addEntityUsage("DynamicDeptUsage", entityDef.getFullName(), false, false);
viewDef.addAllEntityAttributes("DynamicDeptUsage");
viewDef.resolveDefObject();
viewDef.registerSessionDefObject();
viewDef.writeXMLContents();
viewDef.saveXMLContents();
return viewDef;
} catch (Exception ex) {
System.out.println(ex.getLocalizedMessage());
return null;
private void addViewToPdefApplicationModule(ViewDefImpl viewDef) {
oracle.jbo.server.PDefApplicationModule pDefAM = oracle.jbo.server.PDefApplicationModule.findDefObject(getDefFullName());
if (pDefAM == null) {
pDefAM = new oracle.jbo.server.PDefApplicationModule();
pDefAM.setFullName(getDefFullName());
pDefAM.setEditable(true);
pDefAM.createViewObject(DYNAMIC_DETP_VO_INSTANCE, viewDef.getFullName());
pDefAM.applyPersonalization(this);
pDefAM.writeXMLContents();
pDefAM.saveXMLContents();
////////adf-config.xml//////////////////////
<?xml version="1.0" encoding="windows-1252" ?>
<adf-config xmlns="http://xmlns.oracle.com/adf/config" xmlns:config="http://xmlns.oracle.com/bc4j/configuration" xmlns:adf="http://xmlns.oracle.com/adf/config/properties"
xmlns:sec="http://xmlns.oracle.com/adf/security/config">
<adf-adfm-config xmlns="http://xmlns.oracle.com/adfm/config">
<defaults useBindVarsForViewCriteriaLiterals="true"/>
<startup>
<amconfig-overrides>
<config:Database jbo.locking.mode="optimistic"/>
</amconfig-overrides>
</startup>
</adf-adfm-config>
<adf:adf-properties-child xmlns="http://xmlns.oracle.com/adf/config/properties">
<adf-property name="adfAppUID" value="TestDynamicEC-8827"/>
</adf:adf-properties-child>
<sec:adf-security-child xmlns="http://xmlns.oracle.com/adf/security/config">
<CredentialStoreContext credentialStoreClass="oracle.adf.share.security.providers.jps.CSFCredentialStore" credentialStoreLocation="../../src/META-INF/jps-config.xml"/>
</sec:adf-security-child>
<persistence-config>
<metadata-namespaces>
<namespace metadata-store-usage="mdsRepos" path="/sessiondef/"/>
<namespace path="/model/" metadata-store-usage="mdsRepos"/>
</metadata-namespaces>
<metadata-store-usages>
<metadata-store-usage default-cust-store="true" deploy-target="true" id="mdsRepos">
<metadata-store class-name="oracle.mds.persistence.stores.file.FileMetadataStore">
<property name="metadata-path" value="/tmp"/>

</metadata-store>
</metadata-store-usage>
</metadata-store-usages>
</persistence-config>
</adf-config>
//////////////////////////////////////////////////////////////////////////////////////////////////////////

Hi Frank,
I m trying to save entity and view object xml by calling writeXMLContents() and saveXMLContents() so that these objects can be retrieved using the xmls later on.
These methods internally use MDS configuration in adf-config.xml, which is creating the issue.
Please share your thoughts on resolving this or if, there is any other way of creating dynamic entity/view objects for db tables created at runtime.
Nik

Memory limitation for session object!

what is the memory limitation for using session objects?
venu

as already mentioned there is no actual memory limitation within the specification, it only depends on the jvm's settings
how different app-server handle memory management of session objects is another part of the puzzle, but in general you should not have problems in writting any object to the session.
we had the requirement once to keep big objects in session, we decided to do a ResourceFactory that returns us the objects, and only store unique-Ids into the session.
We could lateron build on this and perform special serialization tasks of big objects in the distributed environment.
Dietmar

Using a session object to hold the value of a record set?

Hi,
I'm trying to hold the value of a record set (or literally the content of a column in a query in a db) in a session variable so that I can call on this later and insert into another table.
I'm not sure of the correct syntax, I've already made a connection to the DB. I'm trying the following but it doesnt seem to like the code:
<% session.setAttribute("code",rs("column_name")); %>
<%String attrib =
String.valueOf ( session.getAttribute("code")); %>
Hello <%= attrib %>
Any ideas, I dont know how to reference the record set, I declared the recordset previously as rs. Help! Can't find examples anywhere on the net!

So just to recap. I appear to be seeing the column name "custorderno" within the Microsoft Access query "lastcust". But I get "no data found" when I run the following code (which I have sectioned off)
<!-- connect to database and lastcust query --!>
<%
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
Connection conn = DriverManager.getConnection("jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=C:/Tomcat/jakarta-tomcat-4.1.31/webapps/ROOT/Oatcake.mdb","","");
Statement statement = conn.createStatement();
String sql = "SELECT * FROM lastcust";
ResultSet rs = statement.executeQuery(sql);
while (rs.next()) {
%>
<TR><TD><%= rs.getString("custorderno") %></TD>
</TR>
<% session.setAttribute("code",rs.getString("custorderno")); %>
<% String attrib =
String.valueOf ( session.getAttribute("code") ); %>
Hello <%= attrib %> [B]
<%
%>
</TABLE>
<%
if (statement != null)
statement.close();
if (conn != null)
conn.close();
catch (Exception e) {out.print(e);}
%>
</BODY>
</HTML>
No as mentioned I am (as you can see) declaring everything as a string when in actual fact the contents of the "custorderno" within the query is set to a autonumber within MS Access.
The while loop does work by returning the contents but the session object part is not working correctly with the following result returned:
[B]java.sql.SQLException: No Data Found
Help please!

Vector and session object...

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