nullpointerexception

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NullPointerException when using tomcat

I receive an error like this when invoking a request: SEVERE: Servlet.service() for servlet [getRecomendations] in context with path [/my-webapp] threw exception[详细]

2023-03-27 18:16 分类：问答
Android string-array crash

I have a very weird problem with my Android application.Every time I add a string-array to my strings.xml (or any other file in res/values/), my program crashes on start up.I know, with absolute certa[详细]

2023-03-27 14:06 分类：问答
Unexpected NullPointerException using Javassist

I run the following code : CfField f = ... CtClass classeEnglobante = f.getDeclaringClass(); ClassPool pool = classeEnglobante.getClassPool();[详细]

2023-03-26 20:18 分类：问答
android null pointer exception [closed]

Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers.[详细]

2023-03-26 17:11 分类：问答
NullPointerException on TextEdit

I have a method that pops up an AlertDialog that asks the user for an IP address of a server to connect to for a game. The AlertDialog is as follows:[详细]

2023-03-26 11:59 分类：问答
NullPointerException using AsyncTask to download server's data and apply it to a list-adapter

Why do I get this NullPointerException? 08-08 11:07:15.669: ERROR/AndroidRuntime(659): Uncaught handler: thread main exiting due to uncaught exception[详细]

2023-03-26 09:59 分类：问答
NullPointerException: Does not every exception contain a cause?

I\'ve tried calling this on exceptions universally and by default throughout my application: String causeClass = e.getCause().getClass().getName();开发者_StackOverflow社区[详细]

2023-03-25 21:17 分类：问答
Null pointer exception in enhanced for loop over Vector

How could this code throw a null pointer exception? for (Foo f : Vector<Foo> v) { f.doStuff(); // this li开发者_StackOverflow中文版ne throws a NullPointerException[详细]

2023-03-25 17:03 分类：问答
Android java.land.nullpointer exception or source not found at onClick(View v)

I am trying to run a simple Android tutorial. I have written a few already, and have come to expect the source not found error to be a bit misleading, so I ignore it, but this is a stack trace and som[详细]

2023-03-25 13:12 分类：问答
Android MapView in TabBar Application -> NullPointerException

I have a TabBarApplication. As i select the map-tab, the application crashes. The log shows a Nullpointerexception at line \"final MapController mapControl = mapView.getController();\". I have no idea[详细]

2023-03-25 08:48 分类：问答