Error Calling Method On Object
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Error Calling External Object Function
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Error Calling Method On Npobject
Join them; it only takes a minute: Sign up can we call any method on null object? up vote 4 down vote favorite is it possible? Object obj=null; obj.someMethod(); someMethod{/*some code here*/} java null method-call share|improve this question edited error calling method on npobject applet May 2 '11 at 8:55 Péter Török 87.5k17196281 asked May 2 '11 at 8:50 Anand 2112 3 Well you certainly can... just the method can't be executed as you get a NullPointerException. –Péter Török May 2 '11 at 8:53 add a comment| 10 Answers 10 active oldest votes up vote 7 down vote You can call a static method on a null pointer. The pointer will naturally be completely ignored in a static method call, but it's error calling method on npobject javascript still a case when something that (without looking at the class definition) seemingly should cause a NullPointerException runs just fine. class FooObject { public static void saySomething() { System.out.println("Hi there!"); } } class Main { public static void main(String[] args) { FooObject foo = null; foo.saySomething(); } } But just to make it clear - no, you can't call an instance method with a null pointer. Protecting the programmer against this is one of the really basic protections that set languages like Java apart from "lower level languages" such as C++. It enables the error to be reported at the calling end, instead of it causing an inexplicable segfault/whatnot inside the method itself. share|improve this answer edited May 2 '11 at 9:03 answered May 2 '11 at 8:57 Matti Virkkunen 43.3k173116 5 It should be noted that calling a static method from a variable like this is almost universally considered to be bad style: it implies a relation when there is none. –Joachim Sauer May 2 '11 at 9:13 1 Why almost? You know of any case where it is prefered? –aioobe May 2 '11 at 9:24 add a comment| up vote 4 down vote No we can't. it will throw NullPointerException as long as the method is not static. If method is static it will run. Read this: null : Java Glossary share|improve this answer edited May 2 '11 a
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Error Calling Method On Npobject Safari
a minute: Sign up Java “double cannot be dereferenced” error - calling method on double data type up vote 0 down vote favorite I'm trying to use the following method for conversion between temperature scales in Java. Problem is when I http://stackoverflow.com/questions/5855188/can-we-call-any-method-on-null-object call the method I get a "double cannot be dereferenced" error. I understand that the reason is that methods cannot be called on primitive data types, and I think the solution is to use a wrapper but I'm not sure what that code would look like (my initial attempts at using Double wrapper all produced errors). public double celsius(double f) { return (f - 32.0)/1.8; } public double fahrenheit(double c) { return c * 1.8 + 32.0; } public void doConversion() http://stackoverflow.com/questions/35377330/java-double-cannot-be-dereferenced-error-calling-method-on-double-data-type { double tempC = 0.0; double tempF = tempC.fahrenheit; // double cannot be dereferenced error } java methods double wrapper share|improve this question edited Feb 17 at 8:45 asked Feb 13 at 7:32 Lauren Stephen 218 add a comment| 4 Answers 4 active oldest votes up vote 1 down vote accepted You already have the methods defined in you class. While doing conversion, you just have to call those methods like below: public void doConversion() { double tempC = 0.0; double tempF = fahrenheit(tempC); } Hope this helps! share|improve this answer answered Feb 13 at 7:37 Ravi Ranjan 523218 add a comment| up vote 1 down vote Do something like this: public class temperature{ public double T; //in C public temperature(double T){ this.T = T; } public double getC(){ return T; } public double getF(){ return T * 1.8 + 32.0; } } share|improve this answer answered Feb 13 at 7:37 S.Klumpers 33111 add a comment| up vote 1 down vote Instead of double tempF = tempC.fahrenheit; use double tempF = fahrenheit(tempC); share|improve this answer edited Feb 13 at 7:40 answered Feb 13 at 7:36 Jim Garrison 56.7k1190118 It should be = –rootTraveller Feb 13 at 7:38 Oops, typo. = and - are next to each other. Thanks. –Jim Garrison Feb 13 at 7:40 Thanks. Helpful. I wasn't aware of calling a method that way (new to Java). –Lauren Stephen Feb 13 at 23:05 add a comme
in my app (no actionscript!). Is it possible that this error comes from some newrelic.jar class ? tdoherty 2014-07-07 15:33:00 UTC #3 Hi Daniel, It is https://discuss.newrelic.com/t/error-calling-method-on-npobject/2964 difficult to say what might be causing this. But as an initial troubleshooting http://krpano.com/forum/wbb/index.php?page=Thread&threadID=5669 step, lets try to eliminate some of your browswer addons. Can you try use Chrome in Incognito mode, or with all addons disabled and see if this helps? Please let us know how that goes for you. Also, it would be very useful to know if your page has any adds in it, error calling Google, Bing etc. Tom daniel_goldberg 2014-07-07 18:21:31 UTC #4 Hi Tom, thanks for reply.We don't have any addon in our page. I could not reproduce the error. I tested the page with IE, Firefox and Chrome (Mac and Windows environment) and nothing happens but in our page, in the last six hours, we had 65 NPObject error.We only have one js library (Strophe - https://github.com/strophe/strophejs) but it error calling method doesn't need any flash file. Do you have additional information about this error in our app? alexis 2014-07-08 16:40:04 UTC #5 To help us investigate this further, can you provide a URL to the page on your site where you're seeing this error occur? That way we can take a look at how the New Relic monitoring scripts are being injected and what they may be interacting with. NPObject is not only used for Flash or Actionscript (although this is a very common case where it appears); it's an interface to any foreign (non-Javascript) code. It also would be helpful if you could provide a permalink to the application your site is reporting to in New Relic. To create a permalink to any page within the New Relic user interface, scroll to the bottom and click 'Permalink ∞' all the way on the right next to 'Kiosk Mode.' This will show us the exact page and time period that you are observing. It's safe to post a permalink on the forum; only New Relic staff and users with existing access to your account will be able to use it. daniel_goldberg 2014-07-08 19:08:51 UTC #6 Hi Alexis, It's not pos
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