reading config file from different folder java

Question

I am trying to read a config file based on the code here:

http://www.opencodez.com/java/read-config-file-in-java.htm

So I found that if the config.cfg is in same directory as of where I am running the code, then everything is fine but if the config is at different directory

example: /path/to/config.cfg

I get this error:

java.lang.NullPointerException at java.util.Properties$LineReader.readLine(Properties.java:418) at java.util.Properties.load0(Properties.java:337) at java.util.Properties.load(Properties.java:325) at packagename.conf.Config.<init>(Config.java:14) at packagename.conf.Config.main(Config.java:30)

My guess is it is not able to find the file. But how do I modify the above code to read config file from a different folder? Thanks

Edit: Code from the link:

import java.util.*; import java.util.Properties; public class Config { Properties configFile; public Config() { configFile = new java.util.Properties(); try { configFile.load(this.getClass().getClassLoader(). getResourceAsStream("myapp/config.cfg")); }catch(Exception eta){ eta.printStackTrace(); } } public String getProperty(String key) { String value = this.configFile.getProperty(key); return value; } }

The actual code you use for opening the file would be very helpful here — Alexander Weinert
– Alexander Weinert, Commented Jan 3, 2013 at 23:37
@AlexanderWeinert: HI.. its the same code from the link. I just copy pasted :) — frazman
– frazman, Commented Jan 3, 2013 at 23:38
It will definitely throw FileNotFoundException. To get rid of this either gave it a absolute path or specific relative path — Smit
– Smit, Commented Jan 3, 2013 at 23:38

ruakh · Accepted Answer · 2013-01-03 23:46:42Z

The code that you posted expects the configuration-file to be on the classpath (that is, in the same sorts of places that Java looks for your .class files). So, you can either include the directory containing the configuration-file in the classpath:

java -classpath .:/path/to packagename.conf.Config

Or else you can modify the code to expect the configuration-file to be a regular filesystem file:

final InputStream cfg = new FileInputStream("/path/to/config.cfg"); try { configFile.load(cfg); } finally { cfg.close(); }

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