Using datasource with streaming api inside a web service

Question

I am using the 9.1 server and accessing a datasource
created with aldsp3.0. When I run the code below as a
standalone java app, everything works fine. When I run it
on the server, I get a class cast exception when trying to cast an object returned from the stream to MyData type.
When running the java app in the debugger, the objects
dataServiceDoc, dog , and dObj all have
the correct type. When running the web service in the debugger, the objects are all of type
DataObjectGeneral, thus causing the cast error.
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Any help will be greatly appreciated!
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Thanks.
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package services;
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import javax.jws.WebMethod;
import javax.jws.WebService;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import weblogic.jndi.Environment;
import com.bea.dsp.RequestConfig;
import com.bea.dsp.das.DASResult;
import com.bea.dsp.das.DataAccessServiceFactory;
import com.bea.dsp.das.PreparedExpression;
import com.bea.sdo.impl.data.DataObjectGeneral;
import commonj.sdo.DataObject;
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@WebService
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public class MyService
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private final static String DS_URL = "t3://localhost:7001";
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@WebMethod
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public String testMethod2()
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StringBuilder result = new StringBuilder();
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try
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// Get the initial context to the WebLogic Server passing in user credentials
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Context ctx = getInitialContext(DS_URL,"weblogic", "weblogic");
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RequestConfig reqConfig = new RequestConfig();
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reqConfig.enableFeature(RequestConfig.RETURN_DATA_SERVICE_AUDIT);
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reqConfig.enableFeature(RequestConfig.RETURN_AUDIT_PROPERTIES);
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reqConfig.setStringArrayAttribute(RequestConfig.RETURN_AUDIT_PROPERTIES,
new String[] { "common", "query" });;
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String dspDataSpace = "MY_DS";
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String adhoc = createQuery();
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PreparedExpression pe = DataAccessServiceFactory.prepareExpression(ctx, dspDataSpace, adhoc);
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DASResult<Object> dasResult = pe.executeQuery(reqConfig);
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int i = 0;
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int N = 100;
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Long[] ids = new Long[N];
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while (dasResult.hasNext() && i<N)
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Object dataServiceDoc = dasResult.next();
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// Convert Object to a Data Object
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DataObjectGeneral dog = (DataObjectGeneral) dataServiceDoc;
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DataObject dObj = dog.getRootObject();
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// Cast the Data Object to the SDO Type (MyDataType)
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MyDataType p = (MyDataType) dObj;
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i++;
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catch (Exception e)
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result.append(e);
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return result.toString();
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private static InitialContext getInitialContext(String url, String username, String password) throws NamingException
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Environment env = new Environment();
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env.setProviderUrl(url);
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env.setInitialContextFactory("weblogic.jndi.WLInitialContextFactory");
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env.setSecurityPrincipal(username);
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env.setSecurityCredentials(password);
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return new InitialContext(env.getInitialContext().getEnvironment());
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public static void main(String [] args)
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MyService ms = new MyService();
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System.out.println(ms.testMethod2());
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Answer 1

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