How to recognize an exception with JDBC user-defined?

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  return a SUCCESS;
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  If (eingabe.compareTo (b_secmax) == 1)
  {
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  CREATE OR REPLACE TYPE IMPROG. SECONDMAX_J as object
  
  (
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  NAME "Java.Math.BigDecimal return from SecondMax_j.ODCIAggregateInitialize (oracle.sql.STRUCT []).
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  Member ODCIAggregateTerminate (self IN SECONDMAX_J function,
  
  Return returnValue NUMBER, flags in number number)
  IN THE JAVA LANGUAGE
  NAME "Java.Math.BigDecimal return of SecondMax_j.ODCIAggregateTerminate (double [], int).
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  Member ODCIAggregateMerge (self IN OUT SECONDMAX_J function,
  
  CTX2 IN SECONDMAX_J) return number
  IN THE JAVA LANGUAGE
  NAME "Java.Math.BigDecimal SecondMax_j.ODCIAggregateMerge return (oracle.sql.STRUCT)".
  );
  /
  
  CREATE OR REPLACE FUNCTION F_SECONDMAX_J (NUMBER value) RETURN NUMBER
  
  PARALLEL_ENABLE
  
  AGGREGATION to the HELP of SecondMax_j;
  /
  
  
  
  When I now use the F_SECONDMAX_J function.
  
  "(Columnname) select F_SECONDMAX_J from Tablename t;
  
  It works perfectly and shows me the right result.
  
  Then I tried to implement the fusion part as follows:
  
  public BigDecimal ODCIAggregateMerge (oracle.sql.STRUCT ctx2) throws SQLException {}
  
  BigDecimal Key2 = null;
  
  BigDecimal ctx_max = null;
  BigDecimal ctx_secmax = null;
  
  BigDecimal ctx2_max = null;
  BigDecimal ctx2_secmax = null;
  
  retrieve the context stored with the key
  StoredCtx_SecMax ctx = null;
  try {}
  CTX = (StoredCtx_SecMax) ContextManager.GetContext (Key.intValue ());
  } catch (Exception e) {}
  
  }
  
  Object [] impAttr = ctx2.getAttributes ();
  
  Key2 = (BigDecimal) impAttr [0];
  
  retrieve the second context stored using the key2
  StoredCtx_SecMax ctx_sec = null;
  try {}
  ctx_sec = (StoredCtx_SecMax) ContextManager.GetContext (key2.intValue ());
  } catch (Exception e) {}
  
  }
  
  ctx_max = ctx. LeseMax();
  ctx_secmax = ctx. LeseSecMax();
  
  ctx2_max = ctx_sec. LeseMax();
  ctx2_secmax = ctx_sec. LeseSecMax();
  
  If (ctx2_max.compareTo (ctx_max) == 1)
  {
  If (ctx2_secmax.compareTo (ctx_secmax) == 1)
  {
  CTX. SchreibeSecMax (ctx2_secmax);
  }
  on the other
  {
  CTX. SchreibeSecMax (ctx_max);
  }
  CTX. SchreibeMax (ctx2_max);
  }
  on the other
  {
  If (ctx2_max.compareTo (ctx_secmax) == 1)
  {
  CTX. SchreibeSecMax (ctx2_max);
  }
  }
  
  return a SUCCESS;
  }
  
  When I now try the function
  
  "Select / * + parallel (t 4) * / F_SECONDMAX_J (Columnname) of Tablename t;
  
  I always get a pointer NULL-error because the variable key2 is always 0 and therefore the functions LeseMax() and LeseSecMax()
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  To me it seems that each parallel process is the construction of an additional class for himself, which is not available are my main process.
  
  My question is now how it is possible to access the context of stored of the parallel process, so that I can combine the results.
  
  Thank you very much
  
  Josef

  Hi Josef,

  just guess that I've never implemented with java user-defined aggregate functions or support parallel execution:

  Maybe you have to implement ODCIAggregateWrapContext?

  + Application of ODCIAggregateWrapContext is optional. It should be implemented only when the external memory is used to hold the aggregative, context and the user-defined aggregate is evaluated in parallel (which is, stated as PARALLEL_ENABLE). If the user-defined aggregate is not evaluated in parallel, ODCIAggregateWrapContext is not necessary. +
  [http://docs.oracle.com/cd/B12037_01/appdev.101/b10800/dciaggfns.htm#i1004974]

  Report it to progress and success.

  Good luck
  Rainer Stenzel

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  Hi guru.

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