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Android Error Java.lang.nullpointerexception

Jonathan Warner 140,165 views 21:33 Solving Android SDK Problems - Duration: 9:45. It is probably null. –nfechner Nov 14 '13 at 12:39 "user" variable is likely null and so you cannot successfully call getText() on it. –Kuffs Nov 14 '13 at Well if that happened, the stacktrace would look different. Sign in using Search within: Articles Quick Answers Messages Use my saved content filters home articles Chapters and Sections> Search Latest Articles Latest Tips/Tricks Top Articles Beginner Articles Technical Blogs Posting/Update this content

Thanks Craig Dennis Treehouse Teacher Craig Dennis Craig Dennis Treehouse Teacher 10mo ago I don't see your errors, can you post them please? Some times structuring your code can help avoid null pointer exception. Don't worry we are headed straight to the IDEs soon! In short the stacktrace will tell us unambiguously which statement of the program has thrown the NPE. 1 - Not quite true. http://stackoverflow.com/questions/19977856/android-caused-by-java-lang-nullpointerexception

share|improve this answer answered Nov 14 '13 at 12:42 Snicolas 27.5k971138 is it ok to getText even though you did no enter any on the editText? –rAyso7 Nov 14 With local variables, the compiler would catch this error, but in this case it doesn't. Inherited methods From class java.lang.Throwable final void href="https://developer.android.com/reference/java/lang/Throwable.html#addSuppressed(java.lang.Throwable)">addSuppressed(Throwable exception) Appends the specified exception to the exceptions that were suppressed in order to deliver this exception. Throwable

share edited Oct 12 at 16:14 Makoto 55.9k1167119 answered Jun 7 '14 at 19:22 fgb 11.6k22346 14 +1 Good to have an example that includes going through the stacktrace; it's Tonikami TV 355,433 views 21:59 Tutorial: Android Studio, from zero knowledge to something basic - Duration: 21:33. From class java.lang.Object Object clone() Creates and returns a copy of this object. They have this covered: Thrown when an application attempts to use null in a case where an object is required.

If fact, the only things that you can do with a null without causing an NPE are: assign it to a reference variable or read it from a reference variable, assign See more: Mobile Android Phone hi all :) I have this exception when I try to lunch log in activity in android 01-12 21:04:28.994: E/AndroidRuntime(1442): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.msagroup.sbhmg/com.msagroup.sbhmg.LogIn}: BlackRabbit1703 10,867 views 8:57 What is NullPointerException In Java Core Java Interview Question And Answer - Duration: 4:23. http://stackoverflow.com/questions/22928251/java-lang-nullpointerexception-error-in-android e.g below is a student class which will use in our code.

BufferedReader has the readLine you want like so: BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String answer = reader.readLine(); aneaswiley 1,490 Points aneaswiley aneaswiley 1,490 Points 10 months ago Hopefully the image this is my LoginActivity.java file, public class LoginActivity extends Activity { Button btnLogin; Button btnLinkToRegister; EditText inputphone_number; EditText inputPassword; TextView loginErrorMsg; // JSON Response node names private static String KEY_SUCCESS = Eclipse) offer automatic nullity analisys based on customizable annotations (e.g. @Nullable as listed above) and warn about potential errors. Accessing or modifying the field of a null object.

See vogella.com/tutorials/EclipseDebugging/article.html for example. –fgb Dec 10 '15 at 10:22 4 @fgb Yes, I've used one before to check memory spikes...But how do you use them to check for null

If the exception has an associated error message, that will be output after the exception name. All elements inside of an array are initialized to their common initial value; for any type of object array, that means that all elements are null. For more information about specifying the API level your app requires, read Supporting Different Platform Versions.

This feature is not available right now. http://missioncritiallinux.com/android-error/android-error-java-lang-classnotfoundexception.html Sign in to report inappropriate content. Lets start by exploring the first one: Where does bar come from? Please help me.

This an important thing to know - when there are no more references to an object (in the example above when "reference" and "otherReference" point to null) then the object is Say Button btnA,btnB; @Override public void onCreate(Bundle savedInstanceState){ ............... .............. //DO NOT USE button1 = (Button)findViewById(R.id.button1) ; //use btnA = (Button)findViewById(R.id.button1) ; share|improve this answer edited Oct 25 at 16:34 Community♦ Skip to content Ignore Learn more Please note that GitHub no longer supports old versions of Firefox. http://missioncritiallinux.com/android-error/android-error-converting-result-java-lang-nullpointerexception.html There are many ways that you could use a null value that will result in a NullPointerException.

Join them; it only takes a minute: Sign up java.lang.NullPointerException- error in Android up vote 0 down vote favorite I'm creating a simple login activity using phone number and password for But in other machine I used, the build was failed with an error as follows: [info] Loading global plugins from C:\Users\onsquare\.sbt\plugins [info] Loading project definition from C:\java\workspace\hello-scaloid-sbt\project [info] Set current project When you assign it to 10 in the second line your value 10 is written into the memory location pointed to by x.

I cant tell you what causes this error by your given information, but you can debug it easily in your IDE.

In the second line, the new keyword is used to instantiate (or create) an object of type Integer and the pointer variable num is assigned this object. You must initialize the elements in the array before accessing or derefencing them. Watch QueueQueueWatch QueueQueue Remove allDisconnect The next video is startingstop Loading... And if you count the lines in the file above, line 4 is the one that I labelled with the "HERE" comment.

Prashant Gosai 82,117 views 11:18 Android Studio Start Failed Error - Android Error Solution - Duration: 2:26. final Throwable[] getSuppressed() Returns an array containing all of the exceptions that were suppressed, typically by the try-with-resources statement, in order to deliver this exception. Throwable initCause(check my blog Indeed it is!

Join them; it only takes a minute: Sign up What is a NullPointerException, and how do I fix it? reference = null; // "reference" now point to null. // But "otherReference" still point to the "real" object so this print 1 too... WRONG!! This is enough to give us a solution: add a call to printer.setName() before calling printer.print().

My problem was under the void OnCreate with Button01. Android XML Parsing Using SAX Parser Android XML Parsing Using DOM Parser Android Json Parsing Tutorial Android Spinner Tutorial Android ListView Tutorial Android Read Contact and Display in ListView Android Custom May be null, in which case * the result will be ____. */ public void doSomething(SomeObject obj){ if(obj != null){ //do something } else { //do something else } } Finally, A 17th century colloquial term for children, in the way we use 'kids' today Is there one word that describes the attribute of being either disposable or reusable?

When you dereference a pointer "p", you say "give me the data at the location stored in "p". And we can see clearly that we initialized foo to a non-null value. How do I fix it? There are also conditional breakpoints you can use which will tell you when a value changes. –fgb Dec 10 '15 at 11:33 | show 1 more comment up vote 151 down

Personal Open source Business Explore Sign up Sign in Pricing Blog Support Search GitHub This repository Watch 55 Star 547 Fork 66 scala-android/sbt-android Code Issues 7 Pull requests 1 Projects Is every non stationary series convertible to a stationary series through differencing more hot questions question feed lang-java about us tour help blog chat data legal privacy policy work here advertising java.lang.ClassNotFoundException: - Duration: 2:27. share answered Jun 25 '14 at 11:17 L.

Mountainering with 6 y.o. may be you pass a null value as a String. Hope, it will help and solve your problems too. Your Email Password Forgot your password?

current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. You can change the documentation API level with the selector above the left navigation. Maybe that would make a useful addition to your answer? –Ilmari Karonen Jan 18 '14 at 9:28 7 @EJP "A null pointer is literally not pointing anywhere..." –Bill the Lizard There are things called nested exceptions ...