Thread: Strange settings in System.getProperties

I've just started learning Java. I have installed Oracle's Java 16 on my OpenSuSE desktop machine, and I wrote this little program to display System properties:

  import java.io.Console;
 
  public class ShowSystem
   {public static void main(String[] args)
     {Console console = System.console();
      String path_separator  = System.getProperty("file.separator");
      String file_separator  = System.getProperty("java.class.path");
      String line_separator  = System.getProperty("java.home");
      String java_class_path = System.getProperty("java.vendor");
      String java_home       = System.getProperty("java.vendor.url");
      String java_vendor     = System.getProperty("java.version");
      String java_vendor_url = System.getProperty("line.separator");
      String java_version    = System.getProperty("os.arch");
      String os_arch         = System.getProperty("os.name");
      String os_name         = System.getProperty("os.version");
      String os_version      = System.getProperty("path.separator");
      String user_dir        = System.getProperty("user.dir");
      String user_home       = System.getProperty("user.home");
      String user_name       = System.getProperty("user.name");
      console.format(" Path separator = %s%n",   path_separator);
      console.format(" File separator = %s%n",   file_separator);
      console.format(" Line separator = %s%n%n", line_separator);
      console.format("Java class path = %s%n",   java_class_path);
      console.format("Java       home = %s%n",   java_home);
      console.format("Java     vendor = %s%n",   java_vendor);
      console.format("Java vendor url = %s%n",   java_vendor_url);
      console.format("Java    version = %s%n%n", java_version);
      console.format("Os architecture = %s%n",   os_arch);
      console.format("Os         name = %s%n",   os_name);
      console.format("Os      version = %s%n%n", os_version);
      console.format("User  directory = %s%n",   user_dir);
      console.format("User       home = %s%n",   user_home);
      console.format("User       name = %s%n",   user_name);
     }
   }

It shows some bizarre settings for file.separator and line.separator, that I think are attributable to the path.separator property:

$ java ShowSystem
 Path separator = /
 File separator = .:/home/leslie/bin/NetRexx/:/usr/java/jdk-16.0.1/bin/java:/usr/local/NetRexx/lib/NetRexxF.jar
 Line separator = /usr/java/jdk-16.0.1
 
Java class path = Oracle Corporation
Java       home = https://java.oracle.com/
Java     vendor = 16.0.1
Java vendor url =
 
Java    version = amd64
 
Os architecture = Linux
Os         name = 5.3.18-59.19-default
Os      version = :
 
User  directory = /home/leslie/Documents/SourceCode/Languages/Java/Tutorials
User       home = /home/leslie
User       name = leslie

Actually, looking at the output again, quite a few of these values (java.*, os.*) seem suspect as well. :-)

Is this something I can correct myself, or does Oracle need to do it?

Leslie

--- Update ---

Hmmm... but it looks like maybe version 16 has replaced System.getProperty() with getSystemProperties() in java.lang.management? (At least, that's what Oracle's search page pointed me to.)

settings for file.separator

Check that the getProperty() call matches the variable that the returned value is stored in. For example:

 String file_separator  = System.getProperty("java.class.path");