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absolute path of current class file ?

Posted on 2001-09-05
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Last Modified: 2009-07-29
hi,
    can any one tell me how to retreive the absolute path of any running class file. i can get the path of folder from where i am running my application but i need the path of folder where my class file is residing.

i tried,
System.getProperty("user.dir")
and
File f = new File ("");
f.getAbsolutePath() ;

both gives only the path from where i am running my application not the path where these codes is being executed.

 thanks in advance for any help.



 
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Comment
Question by:shahnazali
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18 Comments
 
LVL 92

Expert Comment

by:objects
ID: 6456241
Your class may not be running from a class file on disk.
It may be contained in a jar file, or loaded over the network.
0
 
LVL 6

Expert Comment

by:kotan
ID: 6456259
try this,

public class path {
    public static void main(String[] args) {
        System.out.println(System.getProperty("user.dir") +
                                System.getProperty("file.separator") +
                                    new path().getClass().getPackage().getName());
    }
}
0
 
LVL 1

Author Comment

by:shahnazali
ID: 6456295
file is neither in jar nor in network.......it's in same machine like normal file.

 actually i am using package say
package A.B.C ;

and my file path which i need dynamically is
C:\Temp\A\B\C\XYZ.class

and i set my class path to "C:\Temp" so that i can execute my class file from any  folder.

now if i run my file from any folder, these codes gives currrent folder path only.. not what i want.......
like if i run this from
D:\Shaan folder the output will be D:\shaan not C:\Temp\A\B\C

check it out.
0
 
LVL 1

Author Comment

by:shahnazali
ID: 6456310
file is neither in jar nor in network.......it's in same machine like normal file.

 actually i am using package say
package A.B.C ;

and my file path which i need dynamically is
C:\Temp\A\B\C\XYZ.class

and i set my class path to "C:\Temp" so that i can execute my class file from any  folder.

now if i run my file from any folder, these codes gives currrent folder path only.. not what i want.......
like if i run this from
D:\Shaan folder the output will be D:\shaan not C:\Temp\A\B\C

check it out.
0
 
LVL 1

Author Comment

by:shahnazali
ID: 6456331
file is neither in jar nor in network.......it's in same machine like normal file.

 actually i am using package say
package A.B.C ;

and my file path which i need dynamically is
C:\Temp\A\B\C\XYZ.class

and i set my class path to "C:\Temp" so that i can execute my class file from any  folder.

now if i run my file from any folder, these codes gives currrent folder path only.. not what i want.......
like if i run this from
D:\Shaan folder the output will be D:\shaan not C:\Temp\A\B\C

check it out.
0
 
LVL 92

Expert Comment

by:objects
ID: 6456363
Try:

URL location =
  getClass().getResource("/A/B/C/XYZ.class");
0
 
LVL 1

Author Comment

by:shahnazali
ID: 6456400
file is neither in jar nor in network.......it's in same machine like normal file.

 actually i am using package say
package A.B.C ;

and my file path which i need dynamically is
C:\Temp\A\B\C\XYZ.class

and i set my class path to "C:\Temp" so that i can execute my class file from any  folder.

now if i run my file from any folder, these codes gives currrent folder path only.. not what i want.......
like if i run this from
D:\Shaan folder the output will be D:\shaan not C:\Temp\A\B\C

check it out.
0
 
LVL 6

Accepted Solution

by:
kotan earned 50 total points
ID: 6456405
Try,

ClassLoader.getSystemResource("A/B/C/XYZ.class").getPath()
0
 

Expert Comment

by:hanumansetti
ID: 6456432
U can use "System.getProperties" or "System.getProperty methods" in java.lang

Mainly

user.home - User's home directory
user.dir  - Working directory
java.class.path - Java class path
java.ext.dirs   - Path of extension directory or directories

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LVL 92

Expert Comment

by:objects
ID: 6456433
Copycat :)
0
 

Expert Comment

by:hanumansetti
ID: 6456456
U can use "System.getProperties" or "System.getProperty methods" in java.lang

Mainly

user.home - User's home directory
user.dir  - Working directory
java.class.path - Java class path
java.ext.dirs   - Path of extension directory or directories

0
 
LVL 1

Author Comment

by:shahnazali
ID: 6457579

heartly thanks for all responses.....

 but now can any body tell me why i am getting this exception on using getPath() method over any URL object.

System.out.println (ClassLoader.getSystemClassLoader().getSystemResource("A/B/C/CurrentDirectory.class").getPath());

Exception in thread "main" java.lang.NoSuchMethodError: java.net.URL: method get
Path()Ljava/lang/String; not found
        at A.B.C.CurrentDirectory.main(CurrentDirectory.java:42)
-------------------

 even if i create url like

URL url = new URL ("http://www.yahoo.com/shaan/index.html");
String s = url.getPath() ;

gives me same error like above ...... y ?

0
 
LVL 92

Expert Comment

by:objects
ID: 6459008
getPath() doesn't exist in 1.1 (which is why I didn't mention it :)).

You can try using getFile() instead.

0
 
LVL 1

Author Comment

by:shahnazali
ID: 6473431
thank u object..... but i am using 1.3

 then ..... where is the problem.
0
 
LVL 92

Expert Comment

by:objects
ID: 6473465
Well that's strange.
From the 1.3 javadoc:

public String getPath()
Returns the path part of this URL.
Returns:
the path part of this URL.

If your compiling with 1.3 then I don't understand why it cannot find the getPath() method.


0
 
LVL 1

Author Comment

by:shahnazali
ID: 6473808
now i got the problem. It's a run time error.

 My system has both 1.2 as well as 1.3 java run time environment. so while compiling it will be taking from 1.3 and during running it will be taking from 1.2 . and getPath()  method is not there in 1.2 . this simple problem blow up my mind.

 thanks again man for ur contribution.

bye.
Shaan
0
 
LVL 92

Expert Comment

by:objects
ID: 6475461
Yes if you want to run the class with a lower cersion of the JVM then you cannot use the method.
0
 
LVL 1

Expert Comment

by:Moondancer
ID: 6961464
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