Function calling the java code

Question

I have a java code that returns the size of the file name. I have created a pl/sql function that calls the method in the java class.
The problem I face is , when I try to call the function using the command "CALL f_size('C:\Batch\Query.sql')into :leng " , the error comes reporting that
"No method func in class fSize ".
I have given both the java& pl/sql code. Can anyone help me out?
import java.io.*;
public class fSize {
public static long func(String s)
File file = new File(s);
long length = file.length();
return length;
create or replace function f_size(path varchar2) return number
as language java
name 'fSize.func(String) return java.lang.Long';

Answer 1

What version of the database are you runnning?
If Oracle 9.2 or later, no need for java code. Use UTL_FILE.FGETATTR procedure.
FGETATTR Procedure
This procedure reads and returns the attributes of a disk file.
Syntax
UTL_FILE.FGETATTR(
   location    IN VARCHAR2,
   filename    IN VARCHAR2,
   exists      OUT BOOLEAN,
   file_length OUT NUMBER,
   blocksize   OUT NUMBER);
Parameters
Table 95-24 FGETATTR Procedure Parameters
Parameters Description
location
Directory location of the source file, a DIRECTORY_NAME from the ALL_DIRECTORIES view (case sensitive)
filename
The name of the source file to be copied
exists
A BOOLEAN for whether or not the file exists
file_length
The length of the file in bytes. NULL if file does not exist.
blocksize
The file system block size in bytes. NULL if the file does not exist.
SQL> create or replace and compile java source named "fSize" as
  2  import java.io.*;
  3  public class fSize {
  4      public static long func(java.lang.String s)
  5      {
  6          File file = new File(s);
  7          long length = file.length();
  8          return length;
  9      }
10  };
11  /
Java created.
SQL> show errors
No errors.
SQL> create or replace function f_size(path varchar2) return number
  2  as language java
  3  name 'fSize.func(java.lang.String) return java.lang.Long';
  4  /
Function created.
SQL>
SQL> select f_size('C:\sqlnet.log') from dual ;
F_SIZE('C:\SQLNET.LOG')
                    762
1 row selected.
SQL>
SQL>
SQL> disconnect
Disconnected from Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.3.0 - Production
SQL>