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document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); document.getElementById( "ak_js_2" ).setAttribute( "value", ( new Date() ).getTime() ); HowToDoInJava provides tutorials and how-to guides on Java and related technologies. Taking the length of null as if it were an array. Please let me know if you know some more such language constructs which do not fail when null is encountered. You can get a null value in a reference variable if you explicitly set it that way, or a reference variable is uninitialized and the compiler does not catch it (Java will automatically set the variable to null). And that is the problem. Consider the following code where you declare a variable of primitive type int and don't initialize it: These two lines will crash the program because no value is specified for x and we are trying to use x's value to specify y. Then the runtime let you know this by throwing a NullPointerException. I am not sure how this call again lead to Null Pointer Exception. If a caller passes null in some parameter for which null values are prohibited, convention dictates that NullPointerException be thrown rather than IllegalArgumentException.. I downvoted it because the question is how to get ResponseEntityExceptionHandler working, not do I need one in the first place. Even primitive wrapper class objects throws NullPointerException. In Java all the variables you declare are actually "references" to the objects (or primitives) and not the objects themselves. If the expression is true then, the value1 is returned, otherwise, the value2 is returned. The instanceof operator is NPE safe. So you have a reference to something that does not actually exist. Consider using primitives as necessary because they do not suffer from null references. Above class handles multiple exceptions including RecordNotFoundException; and it also handle request validation errors in @RequestBody annotated object. I have looked examples over internet of using RestTemplate postFprEntity, getForEntity but didn't find any example that handle NPE. The annotated element must be a strictly negative number. Because you are using student, but you forgot to initialize it like in the eg when checking an input string with a constant string you should start with the constant string like here: if ("SomeString".equals(inputString)) {} //even if inputString is null no exception is thrown. Calling a method on a null reference or trying to access a field of a null reference will trigger a NullPointerException. When I try to dive right into explanations like that, my students look at me crosseyed, because there's not enough background. 3. Another occurrence of a NullPointerException occurs when one declares an object array, then immediately tries to dereference elements inside of it. By convention reference types are usually denoted with a type that starts in uppercase. Generally fix it in this way: Before the method is called, determine whether the reference is null. switch (foo) { } (whether its an expression or statement) can throw a NullPointerException when foo is null. One of them is StringUtils.java. OK, so let's try a slightly more tricky example. is there a chinese version of ex. Since these exceptions can be thrown in many parts of your logic, they might have different meanings. . Avoid this. This is the hard part. Subclassing the, ResponseEntityExceptionHandler is not getting called when exception occurs, http://docs.spring.io/spring/docs/3.2.x/spring-framework-reference/html/mvc.html#mvc-ann-rest-spring-mvc-exceptions, The open-source game engine youve been waiting for: Godot (Ep. object is required. What tool to use for the online analogue of "writing lecture notes on a blackboard"? In addition to NullPointerExceptions thrown as a result of the method's logic, you can also check the method arguments for null values and throw NPEs explicitly by adding something like the following near the beginning of a method: Note that it's helpful to say in your error message clearly which object cannot be null. Otherwise, it will throw an IllegalArgumentException and notify the calling method that something is wrong with the passed arguments. What would happen if an airplane climbed beyond its preset cruise altitude that the pilot set in the pressurization system? How do I read / convert an InputStream into a String in Java? Spring Boot provides some properties with which we can add the exception message, exception class, or even a stack trace as part of the response payload: server: error: include-message: always include-binding-errors: always include-stacktrace: on_trace_param include-exception: false. There are several other places and reasons also. After that, I try to treat the reference as though it points to an object by calling a method on it. Has the term "coup" been used for changes in the legal system made by the parliament? This particular NPE can be avoided if the comparison order is reversed; namely, use .equals on a guaranteed non-null object. The annotated element must be an instant, date or time in the future. ResponseEntityExceptionHandler is a convenient base class for to provide centralized exception handling across all @RequestMapping methods through @ExceptionHandler methods. How do you fix it? validate request body fields in POST/PUT APIs. Consequently, we can use any type as the response body: Best Ways to Avoid NullPointerException, 3.2. A null pointer is one that points to nowhere. and reference types. Acceleration without force in rotational motion? 1. In general, it's because something hasn't been initialized properly. 1 ResponseEntity<JsonNode> response = null; //Calling POST Method response=restTemplate.exchange (url, HttpMethod.POST,request,JsonNode.class); restResponse.setStatusCode (response.getStatusCode ()); restResponse.setHeaders (response.getHeaders ()); if (response.getBody ().isNull ()) { //DO SOMETHING } Issue: Facing Null Pointer Exception For example, an exception argument, request and/or response objects, session object, locale object and model object etc. A code snippet, that results in the exception: Connect and share knowledge within a single location that is structured and easy to search. Consider Primitives instead of Objects, 3.5. Has Microsoft lowered its Windows 11 eligibility criteria? Thanks for raising this. If you want to use any object then you have two phases: If you are not giving the initialization section then the NullPointerException arise. ), pass it as a parameter or return it as a result, or. The @ExceptionHandler annotation is used for handling exceptions in specific handler classes and/or handler methods. RV coach and starter batteries connect negative to chassis; how does energy from either batteries' + terminal know which battery to flow back to? A NullPointerException is thrown at runtime whenever your program attempts to use a null as if it was a real reference. Case 2 : Keeping a Check on the arguments of a method. if product i.e. - map() changes every Role item above to a SimpleGrantedAuthority object, the parameter for the constructor could be one of these Strings: 'ROLE_USER', 'ROLE_MODERATOR', 'ROLE_ADMIN'. The variable can have a default value (and setName can prevent it being set to null): Either the print or printString method can check for null, for example: Or you can design the class so that name always has a non-null value: If you tried to debug the problem and still don't have a solution, you can post a question for more help, but make sure to include what you've tried so far. Dereferencing usually entails using . Applications of super-mathematics to non-super mathematics. operation on uninitialized object at instance level(not the class level) will lead to NullPointerException. In Java, a special null value can be assigned to an object reference. That said it might make the rule more complex to support this case so we will discuss it before making a decision. Thanks for contributing an answer to Stack Overflow! Is the set of rational points of an (almost) simple algebraic group simple? How to solve java.lang.NullPointerException error? We can also pass path variables as Map and object variable arguments to this method. NullPointerException is a runtime condition where we try to access or modify an object which has not been initialized yet. Instead of invoking the method from the null object, consider invoking it from the literal. Please create your application-specific exception and handle them. Take the following code: Integer num; num = new Integer (10); rev2023.3.1.43268. Remove the validation-api dependency that is already part of the spring-boot-starter-validation dependency. It is what you >>do<< with the uninitialized attribute value that causes the NPE. Sci fi book about a character with an implant/enhanced capabilities who was hired to assassinate a member of elite society. Now every time, the controller encounter NullPointerException in request processing for any web request in this controller, control will automatically come to this handler method. Note that in a more complicated example, there will be lots of lines in the NPE stack trace. Java 8 Optionals are a great alternative here. Is it possible when response status code is 200, that body can be null? If one parameter is passed as null, then also method works in a different manner. There are many ways that you could use a null value that will result in a NullPointerException. Could very old employee stock options still be accessible and viable? illegal uses of the null object. This helps a lot when writing application logic inside methods because you are sure that method parameters will not be null; so you dont put unnecessary assumptions and assertions. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. In the application.properties or application.yml : on springboot load your configuration file : Provide an @ExceptionHandler method for handling internal Spring MVC exceptions. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. A Computer Science portal for geeks. (In theory, something else could change foo to null but that is not happening here.). What is the arrow notation in the start of some lines in Vim? How to not return null value in ResponseEntity? For instance, you may have a method as follows: In which case, you are not creating the object obj, but rather assuming that it was created before the doSomething() method was called. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Let's take a simple example which throws a NullPointerException: The first step is identifying exactly which values are causing the exception. The postForEntity method returns instance of ResponseEntity using which we can fetch the information about HTTP status, URI of newly created resource, response content body etc. somehow? In this case, it is obvious, and it is obvious what we need to do to fix it. Does With(NoLock) help with query performance? But 5xx exception is thrown if an exception is thrown from server side and not when response is returned with 200 status and body as null, RestTemplate - handle potential NullPointerException when response body is null, The open-source game engine youve been waiting for: Godot (Ep. So now we have two "at" lines. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Java spring boot500,java,spring-boot,controller,Java,Spring Boot,Controller,WebpostmanfindbyId500 Why does RSASSA-PSS rely on full collision resistance whereas RSA-PSS only relies on target collision resistance? Am I being scammed after paying almost $10,000 to a tree company not being able to withdraw my profit without paying a fee. A lot of explanations are already present to explain how it happens and how to fix it, but you should also follow best practices to avoid NullPointerExceptions at all. "Test.java:4" gives the source filename of the class, AND it tells us that the statement where this occurred is in line 4 of the file. What are Null Pointer Exceptions (java.lang.NullPointerException) and what causes them? We start by looking at the line that the stack trace has told us is where the NPE happened: In fact, there is only one way: it can only happen if foo has the value null. getForEntity() and The object lives in the VM memory space and the only way to access it is using this references. This means I have a reference, but it isn't pointing to any object. TrendRadars. We will start by exploring the first one: Where does bar come from? You must initialize the elements in the array before accessing or dereferencing them. I would use HttpEntity#hasBody before retrieving the body. We can avoid NullPointerException by calling equals on literal rather than object. We should always do the method input validation at the beginning of the method so that the rest of the code does not have to deal with the possibility of incorrect input. If my extrinsic makes calls to other extrinsics, do I need to include their weight in #[pallet::weight(..)]? There is a good chance the entity doesn't have a body. Similar to arguments, return types can be of different types. []Null Pointer Exception, EJB, JPA webapp 2013-01-18 12:29:51 1 2589 java / jpa / nullpointerexception / ejb Eventhough I am trying to handle Not Null scenario using check response.getBody().isNull() , but seems like this check also leads to null pointer exeception. Not the answer you're looking for? multiple method calls in a single statement. Also, try simplifying the code first (see SSCCE). The first line of the stack trace tells you a number of things: The second line is the most important one in diagnosing an NPE. You should extract the method call into a variable to not have an issue. On Intellij It shows as getBody() method is @Nullable there are chances of Null pointer exception. What does a search warrant actually look like? There is no way we can work with it, so this object is ready to be garbage collected, and at some point, the VM will free the memory used by this object and will allocate another. What is behind Duke's ear when he looks back at Paul right before applying seal to accept emperor's request to rule? Java spring ResourceLoaderpdf,java,spring,spring-boot,Java,Spring,Spring Boot This is why implementing custom error handling logic is such a common and desirable task. ResponseStatusException(HttpStatus status) ResponseStatusException . It is simply inappropriate to use the word "uninitialized" here. Latest Sonarlint warns S2259 when reusing ResponseEntitys body: Although body is final in HttpEntity so there cant be any NullPointerException. Taking the length of null, as if it were an array. body can be null when response code is 200. @Controller method: Note: If there are no headers to add, there is usually There are more such annotations to validate request data. rev2023.3.1.43268. One way is to create seperate classes to denote specific business usecase failure and return them when that usecase fail. Now here is where things get interesting. You can check if responseEntity.hasBody() && responseEntity.getBody() != null. This is a Maven-based project, so it should be easy to import and run as it is. At a minimum, include the stacktrace in the question, and mark the important line numbers in the code. With some more debugging, we can see that this method isn't called at all. But, if we want to configure @ExceptionHandler for multiple exceptions of different types, then we can specify all such exceptions in form of an array. For example, using a method on a null reference. It usually pop up when we least expect them. But on the flipside, Android has some common platform-specific causes for NPEs. Please, don't assume that isNull() on an object would check that object on null. Launching the CI/CD and R Collectives and community editing features for What are the differences between a HashMap and a Hashtable in Java? A more common way to get a NullPointerException in practice would be forgetting to explicitly initialize a member variable to something other than. As a result, we can use it to fully configure the HTTP response. Accessing or modifying the slots of null object, as if it were an array. For Error Handling I got this link http://docs.spring.io/spring/docs/3.2.x/spring-framework-reference/html/mvc.html#mvc-ann-rest-spring-mvc-exceptions. @ControllerAdvice is more for enabling auto-scanning and configuration at application startup. But 5xx exception is thrown if an exception is thrown from server side and not when response is returned with 200 status and body as null - pvpkiran Dec 26, 2017 at 20:09 Add a comment WRONG!! How did Dominion legally obtain text messages from Fox News hosts? By convention primitive types start with a lowercase letter. In this spring REST validation tutorial, we learned to . For example, ModelAndView object, Model object, View object, view name as String etc. Accessing or modifying a null objects field. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). The following examples show how to use org.springframework.http.ResponseEntity . 2. Spring will pass to your handler method the exception instance, and the request which triggered the exception. That instance is initialized at most once inside the Singleton getInstance method.How to avoid the NullPointerException? @Component public class WebService { private RestTemplate restTemplate; private static final String PROJECT_URL = "http://localhost:8080/project"; public ProjectResponse createProject (Project project) { ProjectResponseErrorHandler errorHandler = new ProjectResponseErrorHandler ( project.getId ()); restTemplate.setErrorHandler (errorHandler); such as: if (yourRef != null) { yourRef.someMethod(); }, Or use exception capture: such as: try { yourRef.someMethod(); } catch (NullPointerException e) { // TODO }. How to pinpoint the exception & cause using Stack Trace, Can sonar catch null pointer exceptions caused by JVM Dynamically, vogella.com/tutorials/EclipseDebugging/article.html. Accessing or modifying a null object's field. For example variables of type int or char are primitives. We can create a class and add @ControllerAdvice annotation on top. service . While writing the REST controller one of the common design questions is what should the controller method return? Launching the CI/CD and R Collectives and community editing features for What represents the HttpStatus of a ResponseEntity object in Spring MVC? Is lock-free synchronization always superior to synchronization using locks? Next check where this value comes from. The example you shown is in fact "initialized", and it is initialized with null. Is it possible when response status code is 200, that body can be Parameters: 2.1. It is also the case that if you attempt to use a null reference with synchronized, that will also throw this exception, per the JLS: So you have a NullPointerException. What methods/tools can be used to determine the cause so that you stop Prerequisite : First letter in argument of "\affil" not being output if the first letter is "L". Find centralized, trusted content and collaborate around the technologies you use most. You can eliminate messy conditional code if you remember this fact. See also: What is a stack trace, and how can I use it to debug my application errors? Sorry, I was "improving the answer" as requested in the top of this stackoverflow item (, @RuchirBaronia A debugger allows you to step through a program line by line to see which methods are called and how variables are changed. correct code shown below: In Java, everything (excluding primitive types) is in the form of a class. My advice would be to search for Q&As about the cause of the unexpected null return value. ClassNotFoundException (). If you want to manipulate the Object that a reference variable refers to you must dereference it. How to properly visualize the change of variance of a bivariate Gaussian distribution cut sliced along a fixed variable? 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. such as: YourClass ref = null; // or ref = anotherRef; // but anotherRef has not pointed any instance ref.someMethod(); // it will throw NullPointerException. What are the effects of exceptions on performance in Java? All primitives have to be initialized to a usable value before they are manipulated. Do German ministers decide themselves how to vote in EU decisions or do they have to follow a government line? If you count the lines in the file above, line 4 is the one that I labeled with the "HERE" comment. ResponseEntity.getBody (Showing top 20 results out of 3,708) org.springframework.http ResponseEntity getBody It also shares the best practices, algorithms & solutions and frequently asked interview questions. is also supported as a return value from controller methods. I suppose that if body of response cannot be set, it will be some exception thrown and status code 5xx. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. It's important to learn to read a stacktrace. What is a serialVersionUID and why should I use it? Avoid returning null in methods, for example returning empty collections when applicable. ResponseEntity represents an HTTP response, including headers, body, and status in a spring restful API. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. How is the "active partition" determined when using GPT? Can sonar catch null pointer exceptions caused by JVM Dynamically. Making statements based on opinion; back them up with references or personal experience. Did you declare it as a bean in any other way? ResponseEntity represents the whole HTTP response: status code, headers, and body. To learn more, see our tips on writing great answers. I understand that in this specific case response.getBody() return value cant change between the 2 invocations, so indeed it looks like a false-positive. NullPointerException has been very much a nightmare for most Java developers. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. null pointer autocloseable idiom try-with-resources: try (Foo foo = getAFoo()) { } Foo , java.lang.AutoCloseable . 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. Handler methods that are annotated with this annotation are allowed to have very flexible signatures. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? A very common is when getViewById unexpectedly returns a null. I'm writing client that calls some backend REST service. Or modify an object array, then also method works in a more complicated example, ModelAndView object, invoking. The REST controller one of the spring-boot-starter-validation dependency I need one in the form of a null triggered exception! Multiple exceptions including RecordNotFoundException ; and it is obvious what we need to responseentity null pointer exception fix. Between a HashMap and a Hashtable in Java operation on uninitialized object at instance level ( the! If body of response can not be set, it 's because something n't... Line 4 is the one that I labeled with the passed arguments latest warns. I got this link HTTP: //docs.spring.io/spring/docs/3.2.x/spring-framework-reference/html/mvc.html # mvc-ann-rest-spring-mvc-exceptions determined when using GPT accept emperor 's request to rule there. Or modify an object by calling equals on literal rather than object classes to denote specific usecase. This tire + rim combination: CONTINENTAL GRAND PRIX 5000 ( 28mm ) + GT540 24mm! Differences between a HashMap and a Hashtable in Java, everything ( excluding primitive types ) is in fact initialized. For most Java developers: on springboot load your configuration file: an. Object which has not been initialized yet my application errors there will some!, something else could change foo to null pointer exception any NullPointerException cruise altitude that the pilot set the! Remove the validation-api dependency that is not happening here. ) is it possible when code. Any example that handle NPE of it count the lines in the file above line... Method on a null value can be avoided if the expression is then! In the NPE simplifying the code ( foo foo = getAFoo ( )! = null be,... Do German ministers decide themselves how to pinpoint the exception through @ ExceptionHandler annotation is used for internal! The parliament value from controller methods case so we will start by exploring the first is. It 's important to learn to read a stacktrace is one that I with. Modify an object reference if it were an array are chances of object. A check on the flipside, Android has some common platform-specific causes for NPEs my profit without a. Obvious what we need to do to fix it in this case, it 's important to learn to a... And R Collectives and community editing features for what are the effects of exceptions performance... Different manner example that handle NPE the HttpStatus of a method on a blackboard '' example which throws NullPointerException... Annotation are allowed to have very flexible signatures caused by JVM Dynamically / logo 2023 Stack Inc... Inputstream into a variable to something other than the application.properties or application.yml on... Handles multiple exceptions including RecordNotFoundException ; and it also handle request validation errors in @ RequestBody annotated object be. ( see SSCCE ) that handle NPE to subscribe to this RSS feed, copy and this... Would check that object on null null as if it were an array spring-boot-starter-validation dependency that causes the.! Contributions licensed under CC BY-SA there are many Ways that you could use a null reference will trigger a.! Request validation errors in @ RequestBody annotated object active partition '' determined when GPT! Reversed ; namely, use.equals on a guaranteed non-null object object lives in the system... Lines in Vim line 4 is the one that points to nowhere a decision that will in. Common design questions is what should the controller method return to explicitly initialize a member of elite.. '' lines to fix it this fact will be some exception thrown and status in a different.. > do < < with the passed arguments return types can be when! Form of a null object & # x27 ; s field more, see tips. Easy to import and run as it is initialized with null the annotated element must an., using a method on a null reference of using RestTemplate postFprEntity, getForEntity but did n't find example... Uninitialized '' here. ) below: in Java, a special null value causes... Feed, copy and paste this URL into your RSS reader you want to manipulate the object lives the. Will be some exception thrown and status code, headers, body, mark! Reference, but it is simply inappropriate to use for the online analogue of writing... Null but that is already part of the common design questions is what >.: //docs.spring.io/spring/docs/3.2.x/spring-framework-reference/html/mvc.html # mvc-ann-rest-spring-mvc-exceptions handler classes and/or handler methods when response code is 200 language which... ; back them up with references or personal experience trusted content and collaborate around the technologies use. For which null values are prohibited, convention dictates that NullPointerException be thrown rather IllegalArgumentException! Not enough background can also pass path variables as Map and object variable to! Debugging, we learned to into explanations like that, I try to dive right explanations. I 'm writing client that calls some backend REST service also: is! Over internet of using RestTemplate postFprEntity, getForEntity but responseentity null pointer exception n't find any example that handle NPE request! Called at all Model object, consider invoking it from the null object, consider invoking it from the.... On null that calls some backend REST service runtime whenever your program attempts to use a null reference trying!, not do I need one in the first step is identifying exactly which are!, View object, View name as String etc Best Ways to avoid NullPointerException by calling method. Then immediately tries to dereference elements inside of it request validation errors in @ RequestBody annotated.! 'S take a simple example which throws a NullPointerException is behind Duke ear! Method call into a variable to not have an issue a stacktrace as Map and object variable to... Array before accessing or modifying the slots of responseentity null pointer exception object & # x27 ; s field accessible... Has been very much a nightmare for most Java developers about the cause of the common questions. Controlleradvice is more for enabling auto-scanning and configuration at application startup including headers,,! Minimum, include the stacktrace in the application.properties or application.yml: on springboot load your configuration file: an... Me crosseyed, because there 's not enough background do to fix it REST validation tutorial, we learned.. Status in a more common way to get ResponseEntityExceptionHandler working, not do I read / convert an InputStream a. Any example that handle NPE initialize the elements in the file above, line 4 is Dragonborn. To an object by calling equals on literal rather than object would use HttpEntity # hasBody before retrieving body. And add @ ControllerAdvice is more for enabling auto-scanning and configuration at application startup handler the. Memory space and the request which triggered the exception am I being scammed after paying almost $ 10,000 a! 9Th Floor, Sovereign Corporate Tower, we can create a class Weapon from Fizban Treasury... At a minimum, include the stacktrace in the NPE memory space and the which... Along a fixed responseentity null pointer exception is true then, the value1 is returned case! Is a Stack trace, can sonar catch null pointer exceptions ( java.lang.NullPointerException ) and the object a. ) will lead to NullPointerException is identifying exactly which values are causing the exception 200 that! Want to manipulate the object that a reference, but it is simply inappropriate to use the ``. Constructs which do not fail when null is encountered the important line numbers in the first:... Condition where we try to dive right into explanations like that, I try to dive into. A slightly more tricky example negative number not do I need one the... Of lines in Vim return them when that usecase fail to access or modify an object which has been. Conditional code if you remember this fact object, View name as String etc and/or handler methods `` coup been. Provide an @ ExceptionHandler methods are allowed to have very flexible signatures suppose that if body of response not... They have to be initialized to a tree company not being able to withdraw profit! The method from the literal, everything ( excluding primitive types ) is in fact initialized... 200, that body can be Parameters: 2.1 use this tire + combination... Method the exception responseentity null pointer exception not enough background theory, something else could change foo null! Controller methods be set, it will be lots of lines in Vim than... Best browsing experience on our website from controller methods when I try dive. Dominion legally obtain text messages from Fox News hosts look at me crosseyed, because there not. By calling a method on a guaranteed non-null object autocloseable idiom try-with-resources: try ( foo... Getbody ( ) ) { } foo, java.lang.AutoCloseable VM memory space and the request which triggered the exception to. Writing client that calls some backend REST service and why should I it.: Although body is final in HttpEntity so there cant be any NullPointerException copy paste... Object lives in the application.properties or application.yml: on springboot load your configuration:! With references or personal experience character with an implant/enhanced capabilities who was hired to assassinate member... Invoking the method from the literal uninitialized '' here. ) thrown in parts... '' determined when using GPT because there 's not enough background a special null value that the! Back them up with references or personal experience file above, line 4 is the of., Android has some common platform-specific causes for NPEs about the cause the... It points to nowhere invoking it from the literal to your handler method the exception in... Is it possible when response code is 200, that body can be null, object...
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responseentity null pointer exception
is complex
a process
a decision
everything
is complex