I'm currently playing with remote environments using rmi registry. My server is like this:   import java.rmi.registry.LocateRegistry; import java.rmi.registry.Registry;   public class Server {     public static void main(String args[]){         if(args.length");             System.exit(-1);         }              try{             Registry r=LocateRegistry.getRegistry();         MethodsImp methods=new MethodsImp();             //have the object to be remotely accessed so will bind it to the registry             System.out.println("Will register on "+args[0]);            r.rebind(args[0], methods);         }         catch(Exception e){             System.out.println("Something went wrong when registring the methods");             System.out.println(e.getMessage());             System.exit(-1);         }      }  }   When I run the program by:   java -classpath /home/outsider/Desktop/RIM/RIM_TP1_correct/src -Djava.rmi.server.codebase=file:/home/outsider/Desktop/RIM/RIM_TP1_correct/src/ Server regsiter_name   I get this:  Will register on regsiter_name Something went wrong when registring the methods null   For some reason when I used r.rebind it throws an exception which has the message null. Before trying to run the program I install the rmiregistry by doing   rmiregistry &  On the shell. I can't find out what I'm doing wrong. If anyone could help it would be great
What are Null Pointer Exceptions (java.lang.NullPointerException) and what causes them?  What methods/tools can be used to determine the cause so that you stop the exception from causing the program to terminate prematurely?
What does the word treats mean in this context? I don't think it means entertainment, food, drink etc.. Maybe it is an old usage of this word? Does it mean influencing factors or something like that?  This is the first part of the title of the first chapter of the novel "Oliver Twist" by Charles Dickens. The whole title reads:     Treats of the Place Where Oliver Twist was Born and of the Circumstances Attending His Birth I am aware that there are plenty of threads on intensifiers(very, rather, pretty, quite, fairly, etc.), both on this site and on the web, because of their ambiguity in terms of meaning. What I have learned is that their meaning can change depending on which country you are from, which context they are used, or your intonation. So instead of comparing all intensifiers, I decided to make my question more specific. I chose to focus on the word pretty because of its "common" usage.  So as we can see, the word pretty has two meanings and unfortunately they are "pretty" opposite. My question is can you tell me, just by taking into account  the example sentences below, in which sentences "pretty" means "fairly,", and in which it means "very?"  Does "Tom looks pretty tired" always mean "Tom looks a little/fairly tired" ? End of File in C++ Why are some muggles allowed to know of the magical world? What is the "correct" way of embedding text into math mode? Lets say I have something like:   \[ Let x = number of cats \]   (This is a contrived example, but pretend we are actually inside a long align environment block...) "Let" and "number of cats" need to be written like normal text, while x= needs to be math type text.  I've seen this:  \[ \mbox{Let } x = \mbox{ number of cats} \]   and this:  \[ \textrm{Let } x = \textrm{ number of cats} \]   They seem to produce equivalent output, but I'm not sure which is the "correct" one. Also, they are not ideal in that the extra space needs to be placed inside the text mode block, otherwise it is ignored as math mode and butts the text right up against the math.  Ideally there would be some command which allowed embedding text into an equation, which correctly inserted leading and trailing space around the block as required without adding space inside the text block.  How does one do that "correctly"? I can't execute newest Blender 2.80, it says that I need a graphics card that supports OpenGL 3.3 or higher ERROR: A graphics card and driver with support for OpenGL 3.3 or higher is required  Processor: AMD A6-3670 APU with Radeon(tm) HD Graphics, 2695MHz BIOS Version: HPQOEM - 1072009 Dedicated GPU:   This is a very old PC, but when I search online it seems that theoretically Blender 2.8 should run since my openGL is 4.4 Extended support for Ubuntu 12 Not sure if there is a better communication mechanism for asking this question. Ubuntu 12 is EOL April 2017. Do corporations have any option to extend support on 12?  Thanks MySQL - varchar length and performance Square root of Positive Definite Matrix Overlapping matches in Regex I can't seem to find an answer to this problem, and I'm wondering if one exists. Simplified example:  Consider a string "nnnn", where I want to find all matches of "nn" - but also those that overlap with each other. So the regex would provide the following 3 matches:   nnnn nnnn nnnn   I realize this is not exactly what regexes are meant for, but walking the string and parsing this manually seems like an awful lot of code, considering that in reality the matches would have to be done using a pattern, not a literal string. Where to start with Oracle? It is given that $X,Y \overset{\text{i.i.d.}}{\sim} N(0,1)$  Show that $\frac{XY}{\sqrt{X^2+Y^2}},\frac{X^2-Y^2}{2\sqrt{X^2+Y^2}} \overset{\text{i.i.d.}}{\sim} N(0,\frac{1}{4})$  I was thinking of making polar transformations $X=r \cos \theta, Y=r \sin \theta$  Then I am getting stuck at ranges of $\theta$ Why do the less than symbol () appear wrong as upside down exclamation (¡) or question mark (¿)? Are there any way to execute a query inside the string value (like eval) in PostgreSQL? Regression with only categorical variables I want to debug a router that is giving strange DHCP settings, but I don't know how to check it without having to make my system take all the configurations. Isn't there a utility that returns all DHCP settings (like NTP, WINS, DNS, IP, router) whenever a client connects?  Preferably that is platform independent, and that won't require changing the client's configuration to trigger the DHCP. How to use Fermat's little theorem to find $50^{50}\pmod{13}$? What are some good books for learning the concepts of Kinematics, Newton laws, 2D Motion of Object etc.? Prove there are no other solutions of functional equation $f(x+y) = \frac{f(x)+f(y)}{1-f(x)f(y)}$ Asymptotic complexity of .NET collection classes