Java.lang.NullPointerException (OC4J 10.1.3.1 & JDeveloper 10.1.3.1)

Question

My project that ran perfectly under JDeveloper 9.0.5.2/OC4J 9.0.2 no loner runs under Jdeveloper 10.1.3.1/OC4J 10.1.3.1.
The failure (java.lang.NullPointerException ) is in the following code snippet:
=================================================
Public String getString(String columnName) throws SQLException {
return getResultSet().getString(columnName);
=================================================
columnName is being passed the same value in both environments.
The JSP snippet that executes the above is:
=================================================
com.app.servlet.SQLDataSource detail =
((com.app.servlet.SQLDataSource)request.getAttribute("AcctList"));
<td width="20%" class="tableRow">
<a class="a4"><%= detail.getString("ACCT")%></a>
</td>
==================================================
AcctList is a text file that contains the following SQL code:
============
select ACCT
, VDESC
from GL
:WhereClause
:OrderByClause
============
:WhereClause & :OrderByClause are set in a calling "Filter" JSP filter page.
All debug statements in my code indicate the the getResultSet is properly executed. Yet when the detail.getString("ACCT") is hit I receive the NullPointerException.
Any clues?
Remember, no code has changed between the 9.0.2 and 10.1.3.1 environments. They both hot the same database with the same JDBC drivers.
TIA,
Ed.

Answer 1

Jan,
The NullPointerException is pointed to:
at oracle.jdbc.driver.ScrollableResultSet.findColumn(ScrollableResultSet.java:1308)
at oracle.jdbc.driver.OracleResultSet.getString(OracleResultSet.java:1572)
at oracle.jdbc.SQLDataSource.getString(SQLDataSource.java:388)
at apps.AcctList._jspService(_AcctList.java:66)
The code ( in "_AcctList.java") at line 66 reads:
out.print(detail.getString"ACCT") );
However, digging into my application log file I found that the following error happend at 10:52:46.0 (the above error occured at 10:52.50):
07/03/02 10:52:46.0 intemrp: Servlet error
java.lang.IllegalStateException: OutputStream already retrieved
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.0) ].server.http.EvermindHttpServletResponse.getWriter(EvermindHttpServletResponse.java:921)
     at com.sage.servlet.ServletAdaptor.error(ServletAdaptor.java:148)
     at com.sage.servlet.ServletAdaptor.service(ServletAdaptor.java:74)
     at inetmrp.servlet.ServletAdaptor.service(ServletAdaptor.java:119)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.0) ].server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:711)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.0) ].server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:368)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.0) ].server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:866)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.0) ].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:448)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.0) ].server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:216)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.0) ].server.http.HttpRequestHandler.run(HttpRequestHandler.java:117)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.0) ].server.http.HttpRequestHandler.run(HttpRequestHandler.java:110)
     at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
     at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.0) ].util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
     at java.lang.Thread.run(Thread.java:595)
07/03/02 10:52:46.0 intemrp: An existing connection was forcibly closed by the remote host
07/03/02 10:52:46.0 intemrp: An existing connection was forcibly closed by the remote host
Any ideas?
Thanks,
Ed.