JAXB : ClassCastException while using generated java objects

Hi,
I am using JAXB for unmarshalling my xml to set of java objects. It is working but when i use one child object and cast it i am getting ClassCastException.
java.lang.ClassCastException: com.sun.org.apache.xerces.internal.dom.ElementNSImpl cannot be cast to com.xyz.base.EmployeeType
My XSD
======
<xsd:complexType name="EmployeeType">
</xsd:complexType>
<xsd:complexType name="EmployeeList">
     <xsd:sequence>
          <xsd:element name="Employee" type="base:EmployeeType" maxOccurs="unbounded"/>
     </xsd:sequence>
</xsd:complexType>
JAXB Binding
==========
In Binding i am direct schema compiler to use ArrayList for EmployeeList.. as i want to use this as ArrayList.
<jxb:bindings node="//xs:complexType[@name='EmployeeList']">
          <jxb:class ref="java.util.ArrayList"/>
</jxb:bindings>
Everything works well but when i extract element from EmployeeList (i.e. ArrayList) and try to type cast it to EmployeeType, getting following exception:
java.lang.ClassCastException: com.sun.org.apache.xerces.internal.dom.ElementNSImpl cannot be cast to com.xyz.base.EmployeeType
so at the time of unmarshalling how jaxb will know about the type of child element and use accordingly.
Any help would be greatly appreciated.

Hi,
Could you try outputting the class type of the object you are trying to cast?
Check the class of the object. Say use object.class.getName().
I used jaxb quite a long time ago but I believe it resolves the classes correctly.

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>
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java.sql.Array ids = rs.getArray(1);
"ids" is a DB server-side Array with the specified values. The Array object is good
for the duration of the transaction. No need for Oracle-specific classes and only
one extra round-trip to the DB. The only problem is that Oracle SQL statements have
a max length of 64K, so your Array length is limited by the generated SQL statement's
size.
2. The other workaround I thought of would involve batched inserts of array elements
to a temporary table. It doesn't suffer from any size limits. It means more round-trips
to the database, but it might scale better. It looks like this:
temp table & sequence schema:
CREATE SEQUENCE dh_temp_array_seq;
CREATE TABLE dh_temp_array (
seq_num     NUMBER(18),
object_id     NUMBER(18)
java code:
long[] ids = ... // Given id's in an array of longs.
PreparedStatement select = conn.prepareStatement("SELECT dh_temp_array_seq.NEXTVAL
FROM DUAL");
ResultSet rs = select.executeQuery(select);
rs.next();
long seqNum = rs.getLong(1);
rs.close();
PreparedStatement insert = conn.prepareStatement("INSERT INTO dh_temp_array (seq_num,
object_id) VALUES (?, ?)");
for (int index = 0; index < ids.length; index++) {
insert.setLong(1, seqNum);
insert.setLong(2, ids[index]);
insert.addBatch();
insert.executeBatch();
String sql = "SELECT CAST(MULTISET(select object_id from dh_temp_array where seq_num=?)
AS dh_id_tab) FROM dual";
PreparedStatement selectArray = conn.prepareStatment(sql);
selectArray.setLong(1, seqNum);
rs = selectArray.executeQuery();
rs.next();
Array idArray = rs.getArray(1);
. // Use Array
PreparedStatement delete = conn.prepareStatement("DELETE FROM dh_temp_array WHERE
seq_num=?");
delete.setLong(1, seqNum);
delete.executeUpdate();
Here, "idArray" is a DB server-side Array with the specified values. Again, no need
for an OracleConnection. This is all done on the wrapped connection.
Of course, you will have to adapt the examples to your schema/types.
BTW, if BEA would just follow the suggestions in Sun's JDBC 2.0 Standard Extension
API specification, located at:
http://java.sun.com/products/jdbc/jdbc20.stdext.pdf (See sections 6 & 7)
Then their Pooling/XA implementations could return us the logical connection wrapper
created by the Oracle driver (javax.sql.PooledConnection.getConnection() & javax.sql.XAConnection.getConnection()),
which DOES implement OracleConnection, but still hides the physical database connection
from the application code. Note, DON'T access PooledConnection or XAConnection from
your application code. Getting PooledConnection's/XAConnection's from their respective
data sources will create a physical database connection every time (slow). They are
meant for application server developers (like BEA), so they can create DataSource
implementation classes that provide connection pooling and distributed transaction
support, without having to create an entire JDBC wrapper driver (like BEA had to,
before JDBC 2.0 Std. Ext. API existed).
I hope that helps.
-Keith
Keith Caceres
Middleware Architect
Tririga Inc.
"Manisha Mehrotra" <[email protected]> wrote:
>
Hi,
Can anybody help me with this,I'm trying to insert some data in a nested
table(Oracle
8i) , for which i need to create an ArrayDescriptor which needs to be passed
to
the ARRAY on creation , if i directly get the Connection from the driver
, it
works fine , but if i try to get it from the weblogic connection pool ,
it gives
a ClassCastException . I know internally oracle extension for JDBC uses
OracleConnection
, but is there any other ways/workarounds ? Please reply asap .
ArrayDescriptor descriptor = ArrayDescriptor.createDescriptor("ARRAYOFDATA",connection);
ARRAY array = new ARRAY(descriptor, connection, elements);
Manisha

ClassCastException while using session bean in OC4J

I am facing the same problem while deploying a stateless session bean in Oracle 9i AS 1.0.2.2.1. The details are given below.
The following code snippet is used in the client to prepare for the lookup:
Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.evermind.server.rmi.RMIInitialContextFactory");
env.put(Context.SECURITY_PRINCIPAL, "admin");
env.put(Context.SECURITY_CREDENTIALS, "welcome");
//the following line can also have the actual machine name instead of "localhost"
env.put(Context.PROVIDER_URL, "ormi://localhost:23893/myejbs");
Context ctx = new InitialContext(env);
System.out.println("Getting Home....");
Object obj=ctx.lookup("Grouping");
System.out.println("Home Object Is : "+obj);
GroupingHome groupingHome = (GroupingHome)obj;
System.out.println("Got Home");
Grouping grouping = groupingHome.create( );
graphs=grouping.<mehtods>();
I've edited the config/server.xml file to have the following line:
<application name="myejbs" path="C:\oracle\ora102\j2ee\home\applications\classes\myejbs" auto-start="true" />
which points to the directory where the class files reside
I've also change the port in the config/rmi.xml file to 23893.
Now... the problem that I am facing is - while I am running a client from outside the server JVM i.e standalone client... which uses the Grouping interfaces, it works fine. giving me the desired result. But the moment I place the code in a service client deployed in the server or a jsp, I get a ClassCastException for GroupingHome whereas the SOP that I have given after lookup shows that I have found - "Grouping EJBHome". The funny thisng is that bith the working client and the JSP are using sme set of interface class files - Grouping.class (Remote) and GroupingHome.class.
Where am I going wrong?? If anybody knows, or Giri has found an answer to his query... please post a reply.
Thanks.
PS: I've tried new InitialContext(); solution but it didn't work. I have also narrowed the home object with javax.rmi.PortableRemoteObject.narrow(obj,GroupingHome.class) but to no avail :(.

Hi Gauarv,
Did you not see my reply in the following post?
Re: 502 service temporarily unavailable
If I'm not mistaken, this is exactly the same question as you asked
there.
By the way, is there some reason you are still using OC4J version
1.0.2.2? Is there something stopping you from upgrading to the later
versions (9.0.2 and 9.0.3)?
Good Luck,
Avi.

JAXB : ClassCastException while using generated java objects

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