Dynamic proxies and RMI

Hi -
We are having a problem with JDK 1.3.1. We are trying to use dynamic proxies on an object that is bound to an RMI registry.
We find that the proxy works when the object is called from within the same JVM.
When RMI method invocations come in from outside the JVM, the dynamic proxy does not get called.
This seems like a bug. Is it? Is it going to be fixed?
I suppose a way around it for now is to have the RMI implementation simply delegate to another object that has a dynamic proxy attached to it, but that seems ugly.
Thanks
Peter Mularien
Deploy Solutions, Inc.

The problem is, that the java runtime environment currently does not supply stubs for dynamic proxy classes. As far as I know this will not be addressed in 1.4. So you cannot create remote objects as dynamic proxies for now.

Similar Messages

Replace dynamic proxies and reflection with invokedynamic

I have an application that extensively uses reflection and dynamic proxies. It was built on Java 6. Now, I rebuilt it on Java 7, and I am thinking of replacing all reflection and proxies with new invokedynamic.
Can anybody tell me if it's worth the trouble? I mean, will I get any significant performance boost, and will it complicate or simplify my source code?
Also, can you recommend some good tutorials or articles to get me started? I found some, but they confuse me more then they help :-). I think I have an idea how to replace reflection calls, but can't really figure out how to replace dynamic proxies (is there a replacement for InvocationHandler, or something like that?).
Thanks for any help.

the MethodHandle javadocs have pretty straightforward examples on usage http://docs.oracle.com/javase/7/docs/api/java/lang/invoke/MethodHandle.html . It looks like you can use Lookup.unreflect to convert a Method to a MethodHandle (this seems like the most straightforward conversion for existing code): http://docs.oracle.com/javase/7/docs/api/java/lang/invoke/MethodHandles.Lookup.html#unreflect(java.lang.reflect.Method) .

Dynamic Proxies over RMI

We've written an application which provides remote EJB clients a factory class. The
factory class builds dynamic proxy [java.lang.reflect.Proxy] instances which implement
a series of appliaction specific interfaces. When the proxy arrives at the server
(WLS 6.1) the server tries to re-build the instance, but is unable to locate the
application interfaces. We're pretty sure this is due to the default ObjectInputStream.resolveProxyClass()
implementation using the wrong classloader (the application interfaces are in the
EAR file of the app). This can be fixed by putting the interfaces on the system classpath.
Is there anyway to get the server to pick up the interfaces from the EAR file, and
avoid changing the system classpath?

I had pretty much the same problem - it appears that 1.3 doesn't resolve ProxyClasses quite right.
The only workaround I was able to come up with was to do my own deserialization (sending a 'holder'
object across the wire).
I'm curious, did you try it with 1.4 yet?
John Glass <[email protected]> wrote:
We've written an application which provides remote EJB clients a factory class. The
factory class builds dynamic proxy [java.lang.reflect.Proxy] instances which implement
a series of appliaction specific interfaces. When the proxy arrives at the server
(WLS 6.1) the server tries to re-build the instance, but is unable to locate the
application interfaces. We're pretty sure this is due to the default ObjectInputStream.resolveProxyClass()
implementation using the wrong classloader (the application interfaces are in the
EAR file of the app). This can be fixed by putting the interfaces on the system classpath.
Is there anyway to get the server to pick up the interfaces from the EAR file, and
avoid changing the system classpath?--
Dimitri

A Listener solution based on Generics and Dynamic Proxies

Listeners are common in the java world, espacially in swing. It is easy to implement a listener, and it is easy to call an existing method that notifies all registered listeners, but it's laborious to implement this notification code itself.
I present a small, typesafe solution called GenericListeners based on Dynamic Proxies and Generics that reduces the notification code to just a single line of code:
IGenericListeners<FooListener> fooListeners = GenericListeners.create(FooListener.class);If FooListener looks like
public interface FooListener {
public onEnter(int id);
public onExit();
}then you can register and call Listeners with
fooListeners.addListener(foo);
fooListeners.call().onEnter(1);If you are interested, please have a look at
http://www.sebastian-baltes.de/SebWiki/Wiki.jsp?page=GenericListeners
What do you think about this?
Message was edited by:
Sebastian_Baltes

Interesting point, and so I've done some tests:
0:00:01.391 - plainest implementation
0:00:02.469 - GenericListeners
0:00:03.422 - javax.swing.event.EventListenerListI used a test that registers a listener and calls it 10,000,000 times in a for loop on Java 6, AMD Athlon 3000.
I would say that GenericListeners performs well, especially compared to the EventListenerList that is used in all swing components. The problem with EventListenerList is that it stores different classes of listeners at once and has to find the right ones every time you raise an event. For my tests, I only stored one single listener into the list.
You can imagine how bad the performance of the swing implementation would be if you have a real life example with a lot of different listener classes.

Any example of dynamic proxy with RMI?

Hi, are there any good example of dynamic proxy with RMI, using the new RemoteObjectInvocationHandler class?
I am currently implementing a Registry, and want to use dynamic proxy to wrap around the registry stub, to pass extra information to the client.
I've tried it, but the program will hang and get this exception:
Exception in thread "RMI TCP Connection(1616)-192.168.1.23" java.lang.OutOfMemoryError: Java heap space
My implementation looks like this:
public RegistryImpl extends RemoteServer Implements Registry {
    public RegistryImpl(int port, Properties... properties) throws RemoteException, ChannelException {
         // Create a reference for the registry.
     LiveRef liveref = new LiveRef(id, port);
        ref = new UnicastServerRef(liveref);
         Registry proxy = (Registry)RegistryProxy.newProxyInstance(
              this.getClass().getClassLoader(),
              this.getClass().getInterfaces(),
              new RemoteObjectInvocationHandler(this.getRef()));
         /* Using dynamic proxy */
         usref.exportObject(proxy, null, true);
public class RegistryProxy extends Proxy implements Registry {
     private InvocationHandler handler;
     public RegistryProxy(InvocationHandler handler) {
          super(handler);
          this.handler = handler;
     public Remote lookup(String name) throws RemoteException, NotBoundException, AccessException {
          Remote result;
          try {
               Method m = Registry.class.getMethod("lookup", new Class[]{String.class});
               result = (Remote)handler.invoke(this, m, new Object[]{name});
          } catch (SecurityException e) {
               throw new UndeclaredThrowableException(e);
          } catch (NoSuchMethodException e) {
               throw new UndeclaredThrowableException(e);
          } catch (Throwable e) {
               throw new UndeclaredThrowableException(e);
          return result;
     public void bind(String name, Remote remoteObj) throws RemoteException, AlreadyBoundException, AccessException {
     public void unbind(String name) throws RemoteException, NotBoundException, AccessException {
     public void rebind(String name, Remote remoteObj) throws RemoteException, AccessException {
     public String[] list() throws RemoteException, AccessException {
}I am new to Java programming, any help is appriciated.
Regards
Eddie

Hi Eddie,
Perhaps you might like this one:
http://wiki.java.net/bin/view/Communications/TransparentProxy
it uses dynamic proxies to achieve complete RMI transparency.
Something to consider, good luck.
John

Dynamic Proxies

I'm trying to implement a way of monitoring method calls on certain objects so that I am able of enforcing security constraints on these calls.
Considering the functionality provided by the reflection API, I thought that dynamic proxies would be a viable solution.
But they have one major restriction:
A dynamic proxy implements interfaces and thus can only be casted to one of these interfaces.
So what can I do if I need a proxy on class instances which do not implement any interface?
I have read a few older threads dealing with this problem, but I couldn't find any satisfying solution.
There where some ideas of runtime creation of byte code and creating classes from it.
Another way would possibly be runtime compilation of dynamically created code.
But aren't there any less cumbersome ways for implementation?
Regards,
Volker.

The idea with the class loader sounds interesting. Although I would have to implement it in a way so that it creates proxies for all classes ever loaded into the JVM. What I am trying to prevent is the following:
Let's say there is an object "secure" which needs access control and there is another object "caller"with a reference to a "proxy" object monitoring the "secure" instance.
The initial creation of proxies would be no problem since the critical objects are stored in a object database where they can only be retrieved from by explicit query calls. Implementing my own query method allows me to exchange the result of the query with proxy objects which then are returned to the caller.
Now "caller" invokes a method on proxy, let's say proxy.doSomething(this) and passes itself as a parameter to the call. Now let's assume "caller" is granted access to the method and the call is delegated to "secure".
In the process of method execution a method of "caller" is invoked (e.g. the equals method to check if the passed parameter is contained in a Collection) which is possible since "caller" has been passed in as a parameter.
Now the caller.equals(Object o) method could possibly recieve an unprotected instance of the secure object or any other unprotected object which requires access control via the parameter o.
Thus I need some way to dynamically generate a proxy class for "caller" which monitors access to its methods and checks if there are any unprotected instances passed as parameters to it and then exchange these instances with another proxy object.
This is exactly the reason why I need to generate proxies for arbitrary classes (not interfaces) dynamically.
Trying to solve the problem with my own class loader would require me to create proxy objects for all classes, even those from the Java API. I am not sure if this effort pays. Anyway it would probably cause severe performance problems.
Another solution would be dynamically subclassing objects and overwriting each method to perform security checks. But this is inconvenient since it is not guaranteed that i can subclass a given class and furthermore I couldn't prevent access to public fields which may exist.
Perhaps there is another solution to the problem.

Dynamic Proxy and OutOfMemoryError

I ran into this problem before when working with Proxied objects.
I am integrating iBatis into my framework and using Dynamic Proxies to allow a developer to pass in a DAO interface and the Dynamic Proxy will retrieve the correct iBatis SQL Map and run it according to the DAO interface method. Some of these DAO methods take parameters that are lists with 100,000s of records. When I run my batch process using Dynamic Proxies, I get OutOfMemoryError in WebLogic. When I remove the Dynamic Proxy and create a simple implementation for my DAO that I use instead of Proxying it, I get no error and my process runs fine.
Any thoughts? Does sending huge amounts of data through a Proxy or doing quite a bit of activity inside a Proxied object cause OutOfMemoryErrors?
Thanks,
-jay blanton

Check you don't have an infinite loop or recursion which is wrapping Proxies in Proxies in Proxies...

Dynamic Proxies vs. Generated Code

I've seen reference a couple times here about stub serialization issues in
WebLogic implementations that use dynamic proxies for the stubs. It sounds
like recent WebLogic versions have switched back to generated code. Is this
the case?
If so, I thought dynamic proxies were Serializable. So long as your
InvocationHandler is serializable, isn't this the case?
Thanks,
Bob

"Bob Lee" <[email protected]> writes:
I've seen reference a couple times here about stub serialization issues in
WebLogic implementations that use dynamic proxies for the stubs. It sounds
like recent WebLogic versions have switched back to generated code. Is this
the case?WLS 7.0 now uses generated code, but it is bytecode generated by the
server or client on the fly (not as a result of rmic).
If so, I thought dynamic proxies were Serializable. So long as your
InvocationHandler is serializable, isn't this the case?Not necessarily and indeed in order to preserve wire compatibility we
can't. Note that we switched back to generated code for performance
reasons. Generated code is faster than dynamic proxies.
andy

Dynamic Proxies - being forced to recompile client if server changes

all,
I am using WLS 6.1 sp 2.
I have a bean deployed on a particular instance of Weblogic.
This bean is being accessed by a bean from a different instance.
The calling applications ear contains a jar containing the Interface classes, Helper Classes, Stub classes (included since I have read server does not allow dynamic download of stubs), XML (I guess from 6.1 onwards weblogic uses dynamic proxies).
The problem is that every time my server implementation changes just replacing and redploying the client jar doesn't work. I have to recompile my calling application with the new client jar.
Regards
Ashish

ejp wrote:
What's that test for? That method only returns null if you write a null. Are you doing that? or are you expecting a null at EOS? You won't get that, you will get an EOFException.The tutorial that I read from said that if the server closes before the client that the client will read a null before it can close. So it throws a EOFException instead of a null at the EOS? How should I modify it then so that it checks for end of file yet still reads the input?
ejp wrote:
That should work unless there is something else you haven't shown us. Only other things that I can think of is that both the server and the client are on thier own threads because it is a multi-client server, that is not my actual code from my program (I just removed the parts that won't effect whats going on and are fluff), and that this would be the second time that I am sending that Object to the client. Once when my program starts and then the next in the code example I gave you. But thats pretty much it. I pass other Objects fine between the server and clients, I am just having trouble with this guy. Also, this Object implements Serializable and all Objects contained within it also do as well.
Edited by: ShadowAssassain on Jul 24, 2008 7:43 AM

How can we get Dynamic columns and data with RTF Templates in BI Publisher

How can we get Dynamic columns and data with RTf Templates.
My requirement is :
create table xxinv_item_pei_taginfo(item_id number,
Organization_id number,
item varchar2(4000),
record_type varchar2(4000),
record_value CLOB,
State varchar2(4000));
insert into xxinv_item_pei_taginfo values( 493991 ,224, '1265-D30', 'USES','fever','TX');
insert into xxinv_item_pei_taginfo values( 493991 ,224, '1265-D30', 'HOW TO USE','one tablet daily','TX');
insert into xxinv_item_pei_taginfo values( 493991 ,224, '1265-D30', 'SIDE EFFECTS','XYZ','TX');
insert into xxinv_item_pei_taginfo values( 493991 ,224, '1265-D30', 'DRUG INTERACTION','ABC','TX');
insert into xxinv_item_pei_taginfo values( 493991 ,224, '1265-D30', 'OVERDOSE','Go and see doctor','TX');
insert into xxinv_item_pei_taginfo values( 493991 ,224, '1265-D30', 'NOTES','Take after meal','TX');
select * from xxinv_item_pei_taginfo;
Item id Org Id Item Record_type Record_value State
493991     224     1265-D30     USES     fever     TX
493991     224     1265-D30     HOW TO USE     one tablet daily     TX
493991     224     1265-D30     SIDE EFFECTS     XYZ     TX
493991     224     1265-D30     DRUG INTERACTION     ABC     TX
493991     224     1265-D30     OVERDOSE      Go and see doctor     TX
493991     224     1265-D30     NOTES     Take after meal     TX
Above is my data
I have to fetch the record_type from a lookup where I can have any of the record type, sometime USES, HOW TO USE, SIDE EFFECTS and sometimes some other set of record types
In my report I have to get these record typpes as field name dynamically whichever is available in that lookup and record values against them.
its a BI Publisher report.
please suggest

if you have data in db then you can create xml with needed structure
and so you can create bip report
do you have errors or .... ?

Reading XML file into Dynamic Node and Display its output as Table.

Hi All,
Following is the output of XML file:
   <Company>
     <Employee>
          <Name>John</Name>
          <Age>23</Age>
          <***>Male</***>
          <Location>Frankfurt</Location>
     </Employee>
     <Employee>
          <Name>Tina</Name>
          <Age>21</Age>
          <***>Female</***>
          <Location>Boston</Location>
     </Employee>
     <Department>
          <Name>Sales</Name>
          <HQ>Chicago</HQ>
          <Emplyoees>2300</Employees>
     </Department>
I'm able to read the output through DOM parser. But How do I convert this into dynamic node and display this in Web dynpro as Table?
Any pointers in this regard will be great help?
Thanks
Srikant

Hi Maksim,
I've used your example and its now helping as there is kind of agreement on that I'll be knowing the structure of Xml and I can fill the nodes.
But suppose if you have Xml has following structure :
<?xml version="1.0" encoding="utf-8"?><DATA>
<item><MAILERID TYPE="C" SIZE="000030">21</MAILERID><ORG_CODE TYPE="C" SIZE="000004">1232</ORG_CODE><EVENTID TYPE="C" SIZE="000015">CONTRACT</EVENTID><SUBSCR_VALUE TYPE="C" SIZE="000001">0</SUBSCR_VALUE></item>
<item><MAILERID TYPE="C" SIZE="000030">21</MAILERID><ORG_CODE TYPE="C" SIZE="000004">1232</ORG_CODE><EVENTID TYPE="C" SIZE="000015">CREDIT</EVENTID><SUBSCR_VALUE TYPE="C" SIZE="000001">0</SUBSCR_VALUE></item>
<item><MAILERID TYPE="C" SIZE="000030">21</MAILERID><ORG_CODE TYPE="C" SIZE="000004">1232</ORG_CODE><EVENTID TYPE="C" SIZE="000015">EMPRESS</EVENTID><SUBSCR_VALUE TYPE="C" SIZE="000001">0</SUBSCR_VALUE></item>
<item><MAILERID TYPE="C" SIZE="000030">21</MAILERID><ORG_CODE TYPE="C" SIZE="000004">1232</ORG_CODE><EVENTID TYPE="C" SIZE="000015">PAYMENT</EVENTID><SUBSCR_VALUE TYPE="C" SIZE="000001">0</SUBSCR_VALUE></item>
<item><MAILERID TYPE="C" SIZE="000030">21</MAILERID><ORG_CODE TYPE="C" SIZE="000004">1232</ORG_CODE><EVENTID TYPE="C" SIZE="000015">PRICE</EVENTID><SUBSCR_VALUE TYPE="C" SIZE="000001">0</SUBSCR_VALUE></item>
</DATA>
How we will do in this case?
Can we have something similar using DOM? Also what is the best method for displaying data being sent in form of XML. And generalize it for cases like this.
Thanks
Srikant

Dynamic SQL and Data with Single Quotes in it.

Hi There,
I have a problem in that I am using dynamic SQL and it happens that one of the columns does contain single quotes (') in it as part of the data. This causes the resultant dynamic SQL to get confused as the single quote that is part of the data is taken to mean end of sting, when in fact its part of the data. This leaves out a dangling single quote that was meant to enclose the string. Here is my dynamic SQL and the result of the parsed SQL that I have captured:
****Dynamic SQL*****
l_sql:='select NOTE_TEMPLATE_ID '||
'FROM TMP_NOTE_TEMPLATE_VALUES '||
'where TRIM(LEGACY_NOTE_CODE)='''||trim(fp_note_code)||''' '||
'and TRIM(DISPLAY_VALUE)='''||trim(fp_note_text)||''' ';
execute immediate l_sql INTO l_note_template_id;
Because the column DISPLAY_VALUE contains data with single quotes, the resultant SQL is:
******PARSED SQL************
select NOTE_TEMPLATE_ID
FROM TMP_NOTE_TEMPLATE_VALUES
where TRIM(LEGACY_NOTE_CODE)='INQ' and TRIM(DISPLAY_VALUE)='Cont'd'
And the problem lies with the single quote between teh characters t and d in the data field for DISPLAY_ITEM. How can I handle this?
Many thanks,

I have been reliably informed that if one doesn't enclose char/varchar2 data items in quotes, the right indices may not be usedI am into oracle for past 4 years and for the first time i am hearing this.
Your reliable source is just wrong. Bind variables are variables that store your value and which are used in SQL. They are the proper way to use values in your SQL. By default all variables in PL/SQL is bind variable.
When you can do some thing in just straight SQL just do it. Dynamic SQL does not make any sense to me here.
Thanks,
Karthick.

Dynamic SQL and Bulk Bind... Interesting Problem !!!

Hi Forum !!
I've got a very interesting problem involving Dynamic SQL and Bulk Bind. I really Hope you guys have some suggestions for me...
Table A contains a column named TX_FORMULA. There are many strings holding expressions like '.3 * 2 + 1.5' or '(3.4 + 2) / .3', all well formed numeric formulas. I want to calculate each formula, finding the number obtained as a result of each calculation.
I wrote something like this:
DECLARE
TYPE T_FormulasNum IS TABLE OF A.TX_FORMULA%TYPE
INDEX BY BINARY_INTEGER;
TYPE T_MontoIndicador IS TABLE OF A.MT_NUMBER%TYPE
INDEX BY BINARY_INTEGER;
V_FormulasNum T_FormulasNum;
V_MontoIndicador T_MontoIndicador;
BEGIN
SELECT DISTINCT CD_INDICADOR,
TX_FORMULA_NUMERICA
BULK COLLECT INTO V_CodIndicador, V_FormulasNum
FROM A;
FORALL i IN V_FormulasNum.FIRST..V_FormulasNum.LAST
EXECUTE IMMEDIATE
'BEGIN
:1 := TO_NUMBER(:2);
END;'
USING V_FormulasNum(i) RETURNING INTO V_MontoIndicador;
END;
But I'm getting the following messages:
ORA-06550: line 22, column 43:
PLS-00597: expression 'V_MONTOINDICADOR' in the INTO list is of wrong type
ORA-06550: line 18, column 5:
PL/SQL: Statement ignored
ORA-06550: line 18, column 5:
PLS-00435: DML statement without BULK In-BIND cannot be used inside FORALL
Any Idea to solve this problem ?
Thanks in Advance !!

Hallo,
many many errors...
1. You can use FORALL only in DML operators, in your case you must use simple FOR LOOP.
2. You can use bind variables only in DML- Statements. In other statements you have to use literals (hard parsing).
3. RETURNING INTO - Clause in appropriate , use instead of OUT variable.
4. Remark: FOR I IN FIRST..LAST is not fully correct: if you haven't results, you get EXCEPTION NO_DATA_FOUND. Use Instead of 1..tab.count
This code works.
DECLARE
TYPE T_FormulasNum IS TABLE OF VARCHAR2(255)
INDEX BY BINARY_INTEGER;
TYPE T_MontoIndicador IS TABLE OF NUMBER
INDEX BY BINARY_INTEGER;
V_FormulasNum T_FormulasNum;
V_MontoIndicador T_MontoIndicador;
BEGIN
SELECT DISTINCT CD_INDICATOR,
TX_FORMULA_NUMERICA
BULK COLLECT INTO V_MontoIndicador, V_FormulasNum
FROM A;
FOR i IN 1..V_FormulasNum.count
LOOP
EXECUTE IMMEDIATE
'BEGIN
:v_motto := TO_NUMBER('||v_formulasnum(i)||');
END;'
USING OUT V_MontoIndicador(i);
dbms_output.put_line(v_montoindicador(i));
END LOOP;
END;You have to read more about bulk- binding and dynamic sql.
HTH
Regards
Dmytro
Test table
a
(cd_indicator number,
tx_formula_numerica VARCHAR2(255))
CD_INDICATOR TX_FORMULA_NUMERICA
2 (5+5)*2
1 2*3*4
Message was edited by:
Dmytro Dekhtyaryuk

Dynamic SQL and Sub Query

I want need to use dynamic SQL, and include a subquery in the where clause. However, I am getting a syntax error.
I have code that looks like this.
    SELECT (p_v_sqlobj_select)
        INTO CORRESPONDING FIELDS OF TABLE <matrix>
      FROM (p_v_sqlobj_from)
      WHERE (p_v_sqlobj_where).
and I pass it the following bold-faced SQL where clause (please ignore whether the statement makes sense and is the best way to do it - this is just to illustrate).   However, it returns an error.
select tcode from tstc where tcode in <b>( select min( tcode ) as min from tstc )</b>
Am I correct in concluding that I cannot pass complex statements, or have I just missed something?
Thanks for any help.

Hi,
Please try with order by clause in select statement and also use descending
      select * from (p_table)
               into corresponding fields of table <ptab>
              up to p_rows rows
              order by <fieldname> descending.
aRs

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

Dynamic proxies and RMI

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