LOB locater from Java?

Question

I seem to be having a problem with getting a CLOB from a Java stored procedure. I have
public class TheJava {
public static CLOB getData(int arg){. . .
which is specified by
FUNCTION getClobData(a IN NUMBER)RETURN CLOB
AS LANGUAGE JAVA
NAME 'TheJava.getData(int) return oracle.sql.CLOB'
I also have the utility procedure to write it out
PROCEDURE printClobOut(result IN OUT NOCOPY CLOB) is
xmlstr varchar2(32767);
line varchar2(2000);
begin
xmlstr := dbms_lob.SUBSTR(result,32767);
loop
exit when xmlstr is null;
line := substr(xmlstr,1,instr(xmlstr,chr(10))-1);
dbms_output.put_line('| '||line);
xmlstr := substr(xmlstr,instr(xmlstr,chr(10))+1);
end loop;
end;
So if I try
declare
c CLOB;
begin
dbms_lob.createtemporary(c,true);
c:=getlegendasxml(1);
printclobout(c);
dbms_lob.freetemporary(c);
end;
I get
ORA-22275: invalid LOB locator specified
ORA-06512: at "SYS.DBMS_LOB", line 739
ORA-06512: at "PRINTCLOBOUT", line 5
ORA-06512: at line 6
Really, I have no idea what I have to do to get the right locater. Any suggestions are much appreciated.

Answer 1

Yes, I suspect it is the Java that is causing the problem. The code is below. I can't see that there is anything unusual here so why should there be a locater problem?
import java.io.IOException;
import java.io.Writer;
import java.sql.*;
import oracle.sql.CLOB;
public class TheJava {
public static CLOB getData(int arg) throws SQLException{
Connection conx = null;
String message = new String();
CLOB tempClob = null;
Writer tempClobWriter = null;
try{
conx = DriverManager.getConnection("jdbc:default:connection:");
tempClob = oracle.sql.CLOB.createTemporary(conx, true, oracle.sql.CLOB.DURATION_SESSION);
tempClob.open(oracle.sql.CLOB.MODE_READWRITE);
tempClobWriter = tempClob.getCharacterOutputStream();
}catch(SQLException sqlexp){
message = "! CLOB problem.\n ";
message += sqlexp.getMessage();
if(tempClob!=null){
//line A is next line
tempClob.putString(1,message);
return tempClob;
}//end if tempclob
}catch(Exception exp){
message = "! Some other exception.\n ";
message += exp.getMessage();
if(tempClob!=null){
tempClob.putString(1,message);
return tempClob;
}//end if tempclob
}finally{
if(tempClob!=null){ tempClob.freeTemporary(); }
if(conx != null){ conx.close(); }
}//end try catch
In an earlier test I was getting an error reported at line A (I had tried to start from position 0).