Jdbc NullPointerException calling pl/sql procedure from java

Hi.
Getting the following exception calling a plsql procedure from jdbc.
- Jdbc version is 10.2.0.2, but it also happens running several other variants, including 10.1.0.5.0.
- Application is running in Weblogic 8.1.3 (8.1 SP 3).
The procedure call itself has 2 in/out parameters which are tables (actually just 1 dimensional arrays), which I'm suspecting has something to do with the problem. I can successfully call this procedure using a plsql developer tool with the same bind parameters.
Any ideas?
Exception encountered while executing PL/SQL procedure MVT_Web_Inquiry.ShowInquiry:
java.lang.NullPointerException at oracle.jdbc.driver.T4CTTIiov.processRXD([Loracle.jdbc.driver.Accessor;I[B[C[SILoracle.jdbc.driver.DBConversion;[B[B[[Ljava.io.InputStream;[[[B[[Loracle.jdbc.oracore.OracleTypeADT;Loracle.jdbc.driver.OracleStatement;[B[C[S)[Loracle.jdbc.driver.Accessor;(T4CTTIiov.java:139)
at oracle.jdbc.driver.T4C8Oall.receive()V(T4C8Oall.java:521)
at oracle.jdbc.driver.T4CCallableStatement.doOall8(ZZZZ)V(T4CCallableStatement.java:215)
at oracle.jdbc.driver.T4CCallableStatement.executeForRows(Z)V(T4CCallableStatement.java:1119)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout()V(OracleStatement.java:1278)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal()I(OraclePreparedStatement.java:3446)
at oracle.jdbc.driver.OraclePreparedStatement.execute()Z(OraclePreparedStatement.java:3552)
at oracle.jdbc.driver.OracleCallableStatement.execute()Z(OracleCallableStatement.java:5261)
at weblogic.jdbc.wrapper.PreparedStatement.execute()Z(PreparedStatement.java:70)
at
[snip]

OK... I figured it out.
Apparently, this error happens when you forget to register the output part of an in/out parameter. I would have hoped for better error messaging, but oh well.
-ed-

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