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Using Java class from Oracle 9i PL/SQL

Posted on 2007-11-25
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Last Modified: 2013-12-19
Hi everyone,

I am trying to find the way to execute a DOS (XP) batch file from pl/sql store procedure. I am trying to use Java.

I have found the following sample over the internet:

1.
public class SysUtil {      
        public static void runBatch(String path) {
                Runtime runtime = Runtime.getRuntime();
        try     {
            runtime.exec(path);        
        } catch (Exception e) {
            System.err.println(e.getMessage());
        }
        }
 }

2.
-- Loading and calling Java class from Oracle

2.1.  
C:\oracle9i\bin>javac SysUtil.java

2.2
C:\oracle9i\bin>loadjava -user scott/tiger SysUtil.class

3.
CREATE OR REPLACE PROCEDURE runbatch (path IN VARCHAR2)
AS LANGUAGE JAVA NAME 'SysUtil.runBatch (java.lang.String)';
/
CALL DBMS_JAVA.SET_OUTPUT (50);

BEGIN runbatch ('c:\any.bat'); END;
/

---------
I followed all steps specified in this sample. Java class has been compiled and successfully loaded into Oracle.
I created a procedure as instructed successfully as well.

But when I have tried to execute this procedure I got the following error:

ORA-29541: class POSINT.SysUtil could not be resolved
ORA-06512: at "sim.RUN_BATCH", line 0
ORA-06512: at line 2

Please advice how I can correct the problem.

Thanks and regards.
0
Comment
Question by:GoodName
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14 Comments
 
LVL 74

Accepted Solution

by:
sdstuber earned 2000 total points
ID: 20348438
not sure where "POSINT" came from

based on your pl/sql declaration, I'd say

SysUtil should be loaded into the "sim" schema.

You can do that with this...

CREATE OR REPLACE AND RESOLVE JAVA SOURCE NAMED sim."SysUtil" as
public class SysUtil {      
        public static void runBatch(String path) {
                Runtime runtime = Runtime.getRuntime();
        try     {
            runtime.exec(path);        
        } catch (Exception e) {
            System.err.println(e.getMessage());
        }
        }
 }


or you can loadjava into the sim schema
0
 
LVL 74

Expert Comment

by:sdstuber
ID: 20348449
could also be missing grants and synonyms.

If your sim pl/sql is trying to run posint java but can't find it because of a missing synonym you can either add a synonym, or move the java to the sim schema, or explicity refrence the posint schema.

If the pl/sql "can" find it but can't execute it, then grant execute on the posint java to sim.
0
 

Author Comment

by:GoodName
ID: 20351019
Hello Sdstuber,

Thanks for your comments. Please ignore the name of the schemes in my sample (sim and posint).

I have tried to implement a java function on both.

In regards to privileges I used only

grant execute on runBatch to public;

I did not used any synonyms. What I am missing here?
0
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Author Comment

by:GoodName
ID: 20351142
Maybe there is something wrong with this java class.

Because when I tried from command line

loadjava -resolve -user scott/tiger@sim SysUtil.class

I got an error:

errors : class SysUtil
ORA-29545 : badly formed class...
0
 
LVL 74

Expert Comment

by:sdstuber
ID: 20351204
the create and resolve code I sent above ran fine for me.  try doing that instead of using loadjava.

change the schema to whatever you need.

If you are loading the java and the pl/sql into the same schema you don't need grants or synonyms
0
 

Author Comment

by:GoodName
ID: 20353291
When I tried the way you described above it really worked without any errors. It was compiled successfully.

But when I tried to execute a batch file calling this class method it ran but did not do anything and did not generate any errors as well.
0
 
LVL 74

Expert Comment

by:sdstuber
ID: 20353295
did you grant the java privileges?
0
 

Author Comment

by:GoodName
ID: 20353652
I created a class and proc in the same schema.

What privileges should I add?
0
 
LVL 74

Expert Comment

by:sdstuber
ID: 20353814
java doesn't allow you to do much by default.
You have to be given permission to execute each file.


DECLARE
 KEYNUM NUMBER;
BEGIN
  SYS.DBMS_JAVA.GRANT_PERMISSION(
     grantee           => 'SIM'
    ,permission_type   => 'SYS:java.io.FilePermission'
    ,permission_name   => 'c:\any.bat'
    ,permission_action => 'execute'
    ,key               => KEYNUM
    );
END;
/

other permissions you might need to grant...

SYS.DBMS_JAVA.GRANT_PERMISSION(
     grantee           => 'SIM'
    ,permission_type   => 'SYS:java.lang.RuntimePermission'
    ,permission_name   => '*'
    ,permission_action => 'writeFileDescriptor'
    ,key               => KEYNUM
    );


  SYS.DBMS_JAVA.GRANT_PERMISSION(
     grantee           => SIM
    ,permission_type   => 'SYS:java.io.FilePermission'
    ,permission_name   => 'c:\some-file'
    ,permission_action => 'read'
    ,key               => KEYNUM
    );

<<ALL FILES>>  is a key word that wildcards you to all files

0
 

Author Comment

by:GoodName
ID: 20354116
I have done all as you said but with the same results. Maybe I am still missing something...
0
 
LVL 74

Expert Comment

by:sdstuber
ID: 20357798
Let's see if you're having problems running the batch file or if it's something else....

create c:\any.bat  with just one line....

echo "Hi there!" 1>> c:\anybat.log

Then assuming you've created the java and the pl/sql as sim, then log
in as sim and run

BEGIN runbatch ('c:\any.bat'); END;
0
 

Author Comment

by:GoodName
ID: 20370255
Yes, I did this  and after execution procedure nothing happened. Also no errors occurred.
0

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