FileInputStream throws NullPointerException.
- by Mohamed
I am getting nullpointerexception, don't know what actually is causing it. I read from java docs that fileinputstream only throws securityexception so don't understand why this exception pops up.
here is my code snippet.
private Properties prop = new Properties();
private String settings_file_name = "settings.properties";
private String settings_dir = "\\.autograder\\";
public Properties get_settings() {
String path = this.get_settings_directory();
System.out.println(path + this.settings_dir + this.settings_file_name);
if (this.settings_exist(path)) {
try {
FileInputStream in = new FileInputStream(path + this.settings_dir + this.settings_file_name);
this.prop.load(in);
in.close();
} catch (IOException e) {
e.printStackTrace();
}
} else {
this.create_settings_file(path);
try{
this.prop.load(new FileInputStream(path + this.settings_dir + this.settings_file_name));
}catch (IOException ex){
//ex.printStackTrace();
}
}
return this.prop;
}
private String get_settings_directory() {
String user_home = System.getProperty("user.home");
if (user_home == null) {
throw new IllegalStateException("user.home==null");
}
return user_home;
}
and here is my stacktrace:
C:\Users\mohamed\.autograder\settings.properties
Exception in thread "main" java.lang.NullPointerException
at autograder.Settings.get_settings(Settings.java:41)
at autograder.Application.start(Application.java:20)
at autograder.Main.main(Main.java:19)
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)
Line 41 is: this.prop.load(in);
