Error Exception In Thread Main Java.lang.nullpointerexception
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How can I solve Exception in thread “main” java.lang.NullPointerException error [duplicate] up vote 1 down vote favorite This question already has an answer here: What is a NullPointerException, and how do I fix it? 12 answers I am having a problem at a Java program. Exception in thread "main" java.lang.NullPointerException at twoten.TwoTenB.
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a http://stackoverflow.com/questions/19467202/how-can-i-solve-exception-in-thread-main-java-lang-nullpointerexception-error community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up how can I solve Exception in thread “main” java.lang.NullPointerException up vote 0 down vote favorite I created two class but I have problem when I press run it is showing me this error http://stackoverflow.com/questions/21626948/how-can-i-solve-exception-in-thread-main-java-lang-nullpointerexception ----jGRASP exec: java client Exception in thread "main" java.lang.NullPointerException at client.main(client.java:7) ----jGRASP wedge2: exit code for process is 1. ----jGRASP: operation complete. Exception in thread "main" java.lang.NullPointerException << I know what is this mean but I do not know how can I correct my code ! this is first class class circle{ private double radius; static int count=0; public circle(){ radius=8.9; } public circle(double r){ radius=r; count++; } public void setradius(double r){ radius = r; } public double getradius(){ return radius; } public double area (){ double area1 = (radius*radius*(Math.PI)); return area1; } public double circumference(){ double circumference1 = (Math.PI)*radius; return circumference1; } public static double areas(double r){ double area2 = (r*r*(Math.PI)); return area2; } } and this is the second one class client{ public static void main (String args[]){ circle array[] = new circle [10]; for (int i = 0 ; i<10 ; i++){ array [i]= new circle (i++); System.out.println("The area of the circle of radius
ProgrammingWhat does, 'Exception in thread "main" java.lang.NullPointerException in the corresponding code n=Integer.parseInt(con.readLine());' mean?UpdateCancelAnswer Wiki1 Answer Rahul SharmaWritten 58w agoParseint expects a number https://www.quora.com/What-does-Exception-in-thread-main-java-lang-NullPointerException-in-the-corresponding-code-n-Integer-parseInt-con-readLine-mean ,I mean if you have String (that has a number ) it will fail if there is not a number ,in your case readline which will read a https://github.com/jabbink/PokemonGoBot/issues/16 whole line is failing because the readline is return ing string that is not having a number or I guess an empty string in your case .Use error exception eclipse and do debug your code properly544 ViewsView More AnswersRelated QuestionsI have written the program below in Java and I am getting this error: Exception in thread "main" java.lang.NullPointerException at chatwork.Ch...How do I handle NullPointerExceptions while getting data from the database in Java? What are the steps on how to handle other exceptions also?...How do error exception in I solve Java error java.lang.NullPointerException?Why am I getting this error, Exception in thread "main" java.lang.NullPointerException?What does "exception in thread main java.lang.Arrayindex out of bounds" means in java?How can I solve this "java.lang.NullPointerException: lock == null" exception when I get data from the HttpEntity?Why does parseInt give a number format exception?What do you mean by integer.parseInt in java?How do I resolve this error in eclipse? "Exception in thread "main" java.lang.ArithmeticException: BigInteger not invertible."How do I resolve "Exception in thread "main" Java.lang.OutOfMemoryError: GC overhead limit exceeded" error in Jenkins?When I compile my Java program it's easily get compiled, but when I run that code it gives me an Error: Exception in thread "Main"?Java.lang.NullPointerException: While update/edit the excel sheet using Java with POI.How is .parseInt useful in Java compared to just reading the input as an integer?What do we mean by saying a class level lock is a taken by a thread on the "java.lang.Class" instance associated with a Java class?How can I make my code
Sign in Pricing Blog Support Search GitHub This repository Watch 120 Star 652 Fork 326 jabbink/PokemonGoBot Code Issues 104 Pull requests 15 Projects 0 Pulse Graphs New issue Exception in thread "main" java.lang.NullPointerException #16 Closed jst94 opened this Issue Jul 21, 2016 · 13 comments Projects None yet Labels None yet Milestone No milestone Assignees No one assigned 4 participants jst94 commented Jul 21, 2016 Exception in thread "main" java.lang.NullPointerException at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1838) at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110) at java.lang.Double.parseDouble(Double.java:538) at ink.abb.pogo.scraper.MainKt.main(Main.kt:93) When using java -jar Owner jabbink commented Jul 21, 2016 Did you do the thing with the config file as instructed? CptJackieSparrow commented Jul 21, 2016 • edited I have the exactly same problem which i write down under reddit post. It works fine for 15-16 threads, then this thing starts to occure. And my config is just fine. Owner jabbink commented Jul 21, 2016 • edited Is it literally the same error (error contains "readJavaFormatString") or is it more like the error of #13? CptJackieSparrow commented Jul 21, 2016 • edited I'll have a look. UPDATE: It's not even logging in now. UPDATE2: This error now "Exception in thread "main" com.pokegoapi.exceptions.LoginHailedException at com.pokegoapi.auth.PTCLogin.login(PTCLogin.java:169) at ink.abb.pogo.scraper.MainKt.Main(Main.kt:95) jst94 commented Jul 21, 2016 Yeah my config file is good as it seems Owner jabbink commented Jul 21, 2016 • edited Is your config file located next to the .jar and can you paste the contents of your config.properties? @CptJackieSparrow I assume you had a different error, the same from #13, please re-download the jar from the releases here on GitHub. CptJackieSparrow commented Jul 21, 2016 Yeah they are next to each other PTC Login credentials username=[My Username] password=[My Password] latitude=40.763704 longitude=-73.973522 prefered_ball=ITEM_POKE_BALL jst94 commented Jul 21, 2016 Works now. Used another text editor to make the properties. Now getting this: Exception in thread "main" com.pokegoapi.exceptions.LoginFailedException at com.pokegoapi.auth.PTCLogin.login(PTCLogin.java:169) at ink.abb.pogo.scraper.MainKt.main(Main.kt:89) Owner jabbink commented Jul 21, 2016 @CptJackieSparrow seems li