problem in standalone java returning value to shell script

[Murthy Manchala]

I am trying to send password to a shell script to run batch jobs.

I am not able to send password to shell script via java standalone application. the java main method cannot return value as its return type is "VOID". please advice me how i can get password in shell script though java standalone.

Due to security i can't use system out or i can't write to a file.


I saw below code in google but its not working for me
Test.java:

   
public class Test{ 
 public static void main(String args[]){ 
  String ret_value = (new Test()).sample();


 } 
 public String sample(){ 
  return "murthy"; 
 } 
} 
 
test.sh

out=`java Test`
echo $out
   

Thanks
Murthy

[Murthy Manchala]

If i use above code and run the script as

./test.sh

Its not showing any thing.

Thanks
Murthy.

[Rob Spoor]

That's because the only way to make any Java output anything is using System.out, System.err or System.console() (if available). However, you're explicitly forbidden to use any of these. Therefore you simply cannot do what you need to do.

It's like asking you to tighten a screw without letting you use a screw driver, coin or anything else you can use to tighten a screw.

[Murthy Manchala]

Rob,

Due to security reasons i can't use system.out or system.err. I should not print the password. is there any way i can get the password in shell script.


Thanks in advance.

[Henry Wong]

Murthy Manchala wrote:
Due to security reasons i can't use system.out or system.err. I should not print the password. is there any way i can get the password in shell script.

It's pretty simple. If the password can't leave the java program -- system out, files, network, etc. -- it can't get to the shellscript.

Your best option is to move (port) the code that needs the password (in the shellscript), into the java program.

Henry

[Murthy Manchala]

Henry,

except the system.out what are the options i have. I can't write password to a file. is the system.set property works. if it works can you please give me sample code

Thanks

[Henry Wong]

Murthy Manchala wrote:is the system.set property works. if it works can you please give me sample code

No. Shellscripts runs programs in a subshell, so environment variables won't take.... and even if you could, don't the same security restrictions (intent) apply?

Henry