JBO-27122:SQL error during statement preparation + ORA-01006:bind variable not exists

Question

(1) I have built a BC4J View called CallFunctionView which acts as a view i used to call existing PL/SQL functions. My implementation servlet code is presented with the following structure:
public class MyServlet extends HttpServlet {
// Get vector element to perform validation for rule 1 and rule 2
for (int i = 0; i < MyVector.size(); i++) {
MyVectorRow MyRow = (MyVectorRow) MyVector.elementAt(i);
MyRow.checkRule1(am, i);
MyRow.checkRule2(am, i);
(2) Both checkRule1 and checkRule2 will call the ViewObject CallFunctionView. Related codes for checkRule1 and checkRule2 are listed as follows:
public void checkRule1(ApplicationModule am, int intRowIndex)
throws JboException, Exception {
ViewCdCallFunctionImpl vo = (CallFunctionViewImpl) am.findViewObject("CallFunctionView");
if (vo == null) {             
throw new JboException("View Object is null!");
vo.setQuery("SELECT PKG1.MyFunctionOne(?,?,?,?) FROM DUAL");
vo.setWhereClauseParam(0, param1); // param1 is string
vo.setWhereClauseParam(1, param2); // param2 is string
vo.setWhereClauseParam(2, param3); // param3 is String.valueOf(int)
vo.setWhereClauseParam(3, param4)); // param4 is String.value Of(int)
vo.executeQuery(); <- Point of exit where my mentioned error occurs at the second loop
public void checkRule2(ApplicationModule am, int intRowIndex)
throws JboException, Exception {
ViewCdCallFunctionImpl vo = (CallFunctionViewImpl) am.findViewObject("CallFunctionView");
if (vo == null) {             
throw new JboException("View Object is null!");
vo.setQuery("SELECT PKG2.MyFunctionTwo(?,?,?,?) FROM DUAL");
vo.setWhereClauseParam(0, param1); // param1 is string
vo.setWhereClauseParam(1, param2); // param2 is string
vo.setWhereClauseParam(2, param3); // param3 is String.valueOf(int)
vo.setWhereClauseParam(3, param4)); // param3 is String.valueOf(int)
vo.setWhereClauseParam(4, (blnYes)?"Y":null);
vo.setWhereClauseParam(5, (blnYes)?"Y":null));
vo.executeQuery();
(3)The called functions are from different package and with different parameters. For the loop i = 0, no error occurs and both functions generates expected result. For execution of the first function in the second loop (when i = 1), error occurs with the following messages(JBO-27122: SQL error during statement preparation. + java.sql.SQLException: ORA-01006: bind variable does not exist):
oracle.jbo.SQLStmtException: JBO-27122: SQL error during statement preparation. Statement: SELECT PKG1.MyFunctionOne(?,?,?,?) FROM DUAL
     void oracle.jbo.server.QueryCollection.executeQuery(java.lang.Object[], int)
     void oracle.jbo.server.ViewObjectImpl.executeQueryForCollection(java.lang.Object, java.lang.Object[], int)
     void oracle.jbo.server.ViewRowSetImpl.execute(boolean, boolean)
     void oracle.jbo.server.ViewRowSetImpl.executeQuery()
     void oracle.jbo.server.ViewObjectImpl.executeQuery()
     void MyPkg.objects.MyVectorRow.checkRule1(oracle.jbo.ApplicationModule, int)
     void MyPkg.servlet.MyServlet.doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     void javax.servlet.http.HttpServlet.service(com.evermind.server.http.EvermindHttpServletRequest, com.evermind.server.http.EvermindHttpServletResponse)
     void javax.servlet.http.HttpServlet.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     void com.evermind.server.http.ServletRequestDispatcher.invoke(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     void com.evermind.server.http.ServletRequestDispatcher.forwardInternal(javax.servlet.ServletRequest, javax.servlet.http.HttpServletResponse)
     boolean com.evermind.server.http.HttpRequestHandler.processRequest(com.evermind.server.ApplicationServerThread, com.evermind.server.http.EvermindHttpServletRequest, com.evermind.server.http.EvermindHttpServletResponse, java.io.InputStream, java.io.OutputStream, boolean)
     void com.evermind.server.http.HttpRequestHandler.run(java.lang.Thread)
     void com.evermind.util.ThreadPoolThread.run()
## Detail 0 ##
java.sql.SQLException: ORA-01006: bind variable does not exist
     void oracle.jdbc.dbaccess.DBError.throwSqlException(java.lang.String, java.lang.String, int)
     void oracle.jdbc.ttc7.TTIoer.processError()
     void oracle.jdbc.ttc7.Oall7.receive()
     void oracle.jdbc.ttc7.TTC7Protocol.doOall7(byte, byte, int, byte[], oracle.jdbc.dbaccess.DBType[], oracle.jdbc.dbaccess.DBData[], int, oracle.jdbc.dbaccess.DBType[], oracle.jdbc.dbaccess.DBData[], int)
     int oracle.jdbc.ttc7.TTC7Protocol.parseExecuteFetch(oracle.jdbc.dbaccess.DBStatement, byte, byte[], oracle.jdbc.dbaccess.DBDataSet, int, oracle.jdbc.dbaccess.DBDataSet, int)
     void oracle.jdbc.driver.OracleStatement.doExecuteQuery()
     void oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout()
     int oracle.jdbc.driver.OraclePreparedStatement.executeUpdate()
     java.sql.ResultSet oracle.jdbc.driver.OraclePreparedStatement.executeQuery()
     void oracle.jbo.server.QueryCollection.executeQuery(java.lang.Object[], int)
     void oracle.jbo.server.ViewObjectImpl.executeQueryForCollection(java.lang.Object, java.lang.Object[], int)
     void oracle.jbo.server.ViewRowSetImpl.execute(boolean, boolean)
     void oracle.jbo.server.ViewRowSetImpl.executeQuery()
     void oracle.jbo.server.ViewObjectImpl.executeQuery()
     void MyPkg.objects.MyVectorRow.checkRule1(oracle.jbo.ApplicationModule, int)
     void MyPkg.servlet.MyServlet.doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     void javax.servlet.http.HttpServlet.service(com.evermind.server.http.EvermindHttpServletRequest, com.evermind.server.http.EvermindHttpServletResponse)
     void javax.servlet.http.HttpServlet.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     void com.evermind.server.http.ServletRequestDispatcher.invoke(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     void com.evermind.server.http.ServletRequestDispatcher.forwardInternal(javax.servlet.ServletRequest, javax.servlet.http.HttpServletResponse)
     boolean com.evermind.server.http.HttpRequestHandler.processRequest(com.evermind.server.ApplicationServerThread, com.evermind.server.http.EvermindHttpServletRequest, com.evermind.server.http.EvermindHttpServletResponse, java.io.InputStream, java.io.OutputStream, boolean)
     void com.evermind.server.http.HttpRequestHandler.run(java.lang.Thread)
     void com.evermind.util.ThreadPoolThread.run()
I have tried commented either MyRow.checkRule1 or MyRow.checkRule2 for execution. No error occurs for that. The problem occurs when i put the two together in a loop ... the parameter number for Pkg1.MyFunctionOne is less than Pkg2.MyFunctionTwo, which corresponds to the error message 'Bind variable does not exist' ... any cache for calling the function that causes the error at running the vo.executeQuery statement?
Question: Does anyone has any ideas about the error origin and solution? (It is very important to me because i still have several check rules in addition to those mentioned 2 rules.)
Thanks for replying!

Answer 1

Oic ... thanks for your help, but i find a strange thing. No error message is prompted when i break the loop as follows:
// Get vector element to perform validation for rule 1 and rule 2
for (int i = 0; i < MyVector.size(); i++) {
MyVectorRow MyRow = (MyVectorRow) MyVector.elementAt(i);
MyRow.checkRule1(am, i);
// Get vector element to perform validation for rule 1 and rule 2
for (int i = 0; i < MyVector.size(); i++) {
MyVectorRow MyRow = (MyVectorRow) MyVector.elementAt(i);
MyRow.checkRule2(am, i);
It works, but quite strange ... is it a bug for calling the interface setWhereClauseParam(int, object)? As long as all the bind variables have value (your bind-var array is filled perhaps due to previous setWhereClauseParam, the query will work. What's critical is you get the right query every time :)