Solved

can't find properties in jar file

Posted on 2002-05-06
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Last Modified: 2013-11-23
run:
java -classpath "lib/myproject.jar" com.mycompany.MyApp

MyApp code:
Properties pr = new Properties();
pr.load(new FileInputStream("my.properties"));

my.properties sits in the same directory as the exec:

com\mycompany\MyApp.class
com\mycompany\my.properties

whenever I execute the class I get "FileNotFoundException" on the properties file. How do I get the class to locate it?



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Question by:deal051298
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10 Comments
 
LVL 92

Expert Comment

by:objects
ID: 6993075
If your resource is located inside the jar file then you will need to instead read it using the class loader.
Something like:

pr.load(ClassLoader.getSystemResourceAsStream("com/mycompany/my/properties"));

Or from MyApp try:

pr.load(getClass().getResourceAsStream("my.properties"));
0
 

Author Comment

by:deal051298
ID: 6995552
I have to try the first one since it's in a static method. Still doesn't work - I am getting null pointer error as getSystemResourceAsStream() returns null regardless of the path I use:

ClassLoader.getSystemResourceAsStream("/com/mycompany/myapp/my/properties")
ClassLoader.getSystemResourceAsStream("com/mycompany/myapp/my/properties")
ClassLoader.getSystemResourceAsStream("./budgetmonitor/properties")
ClassLoader.getSystemResourceAsStream("/com/mycompany/myapp/my.properties")
ClassLoader.getSystemResourceAsStream("com/mycompany/myapp/my.properties")
ClassLoader.getSystemResourceAsStream("./my.properties")

Cheers
0
 

Author Comment

by:deal051298
ID: 6995555
sorry 3rd one should be:

ClassLoader.getSystemResourceAsStream("./my/properties")
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LVL 92

Expert Comment

by:objects
ID: 6995566
Why can't you use the second one?
0
 

Author Comment

by:deal051298
ID: 6995568
when I try it it just returns null
0
 
LVL 92

Expert Comment

by:objects
ID: 6995580
Are you calling getResourceAsStream from your MyApp class?
ANd is the properties file in your jar in the same directory as MyApp.class?
0
 

Author Comment

by:deal051298
ID: 6995585
Yes and Yes (double/triple/quadruple checked spelling and jar).

I notice that my ant compile create 2 class file for this class.

I have one src file:

com/mycompany/myapp/MyApp.class

and it compiles to:

com/mycompany/myapp/MyApp$1.class and
com/mycompany/myapp/MyApp.class

and the $1 class is 1/20th he size of the main one. Would this have anything to do with it?

Thanks heaps
0
 
LVL 92

Accepted Solution

by:
objects earned 125 total points
ID: 6995597
No they're just inner classes.

From what you've said in your question the correct calls should be any of:

ClassLoader.getSystemResourceAsStream("com/mycompany/my.properties")

OR

MyApp.class.getResourceAsStream("my.properties"));

OR even:

getClass().getResourceAsStream("com/mycompany/my.properties"));


However in your comments you have included a myapp in the package name that is not mentioned in the question so it's a bit unclear where thing actually are.
0
 

Author Comment

by:deal051298
ID: 6995675
sorry for the confusion :-(

locations of files are:

com/mycompany/myapp/my.properties
com/mycompany/myapp/MyApp.class

Didn't see your 2nd solution so tried that - and it works!

pr.load(MyApp.class.getResourceAsStream("my.properties"));

Cheers!
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LVL 92

Expert Comment

by:objects
ID: 6995703
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