SOAPFaultException: error in msg parsing: xml was empty, didn't parse!

Question

Using the web service example from http://www.oracle-base.com/articles/10g/utl_dbws-10g.php. Can anyone tell me why I can't call this web service twice within the same database session? The first call seems to work for each session, but the second generates an error.
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE     11.2.0.3.0     Production
TNS for Linux: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
SQL> CREATE OR REPLACE FUNCTION add_numbers(p_int_1 IN NUMBER,
  2                                         p_int_2 IN NUMBER) RETURN NUMBER AS
  3    l_service sys.utl_dbws.service;
  4    l_call    sys.utl_dbws.call;
  5 
  6    l_wsdl_url        VARCHAR2(32767);
  7    l_namespace       VARCHAR2(32767);
  8    l_service_qname   sys.utl_dbws.qname;
  9    l_port_qname      sys.utl_dbws.qname;
10    l_operation_qname sys.utl_dbws.qname;
11 
12    l_xmltype_in  sys.xmltype;
13    l_xmltype_out sys.xmltype;
14    l_return      NUMBER;
15  BEGIN
16    l_wsdl_url  := 'http://www.oracle-base.com/webservices/server.php?wsdl';
17    l_namespace := 'http://www.oracle-base.com/webservices/';
18 
19    l_service_qname   := sys.utl_dbws.to_qname(l_namespace,
20                                               'Calculator');
21    l_port_qname      := sys.utl_dbws.to_qname(l_namespace,
22                                               'CalculatorPort');
23    l_operation_qname := sys.utl_dbws.to_qname(l_namespace,
24                                               'ws_add');
25 
26    l_service := sys.utl_dbws.create_service(wsdl_document_location => urifactory.geturi(l_wsdl_url),
27                                             service_name           => l_service_qname);
28 
29    l_call := sys.utl_dbws.create_call(service_handle => l_service,
30                                       port_name      => l_port_qname,
31                                       operation_name => l_operation_qname);
32 
33    l_xmltype_in  := sys.xmltype('<?xml version="1.0" encoding="utf-8"?>
34      <ws_add xmlns="' || l_namespace || '">
35        <int1>' || p_int_1 || '</int1>
36        <int2>' || p_int_2 || '</int2>
37      </ws_add>');
38    l_xmltype_out := sys.utl_dbws.invoke(call_handle => l_call,
39                                         request     => l_xmltype_in);
40 
41    sys.utl_dbws.release_call(call_handle => l_call);
42    sys.utl_dbws.release_service(service_handle => l_service);
43 
44    l_return := l_xmltype_out.extract('//return/text()').getnumberval();
45    RETURN l_return;
46  END;
47  /
Function created
SQL> BEGIN
  2    dbms_output.put_line(add_numbers(1,
  3                                     4));
  4    dbms_output.put_line('first call succeeded');
  5    dbms_output.put_line(add_numbers(1,
  6                                     9));
  7    dbms_output.put_line('second call succeeded');
  8  END;
  9  /
5
first call succeeded
BEGIN
  dbms_output.put_line(add_numbers(1,
                                   4));
  dbms_output.put_line('first call succeeded');
  dbms_output.put_line(add_numbers(1,
                                   9));
  dbms_output.put_line('second call succeeded');
END;
ORA-29532: Java call terminated by uncaught Java exception: javax.xml.rpc.soap.SOAPFaultException: error in msg parsing:
xml was empty, didn't parse!
ORA-06512: at "SYS.UTL_DBWS", line 404
ORA-06512: at "SYS.UTL_DBWS", line 401
ORA-06512: at "GLYODER.ADD_NUMBERS", line 38
ORA-06512: at line 6

Answer 1

hi Gyoder      
Do you resolve this problem?
Thanks