classnotfoundexception

问题 I am attempting to fetch User Information, and then display it onto a Table in Swing. Currently I am getting an error as follows each time I execute the piece of code below. Error java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown

问题 Hi awesome person! I have a problem... I get a NullPointerException when my test case reaches allEdges.add(newEdge); in the connectNodes method. I think it has something to do with Edge newEdge = new Edge( n1, n2, weight ); previously in that same method. Is the problem my use of generics in the Edge class or something like that?. I previously got an error directing me at the Edge newEdge = new Edge( n1, n2, weight ); line, saying something like "class not found". But now i seem to get the

问题 I have a Broadcastreceiver which checks for CONNECTIVITY_CHANGE and it crashes sometimes with message: 04-05 18:23:47.080 5561-5561/tenkol.design.com.imbrecords E/AndroidRuntime﹕ FATAL EXCEPTION: main java.lang.RuntimeException: Unable to instantiate receiver tenkol.design.com.imbrecords.NetworkChangeReceiver: java.lang.ClassNotFoundException: tenkol.design.com.imbrecords.NetworkChangeReceiver at android.app.ActivityThread.handleReceiver(ActivityThread.java:2541) at android.app.ActivityThread

问题 I am in a weird situation, which I have no idea what's going on. The code was working, until I upgraded my Android SDK to r17. The code is able to compile, but during runtime, Eclipse throws ClassNotFoundException() , under findClass method, in PathClassLoader.class The class that not found are "org.apache.http.entity.mime.content.ContentBody" and "org.apache.http.entity.mime.content.StringBody" I already imported in the latest (4.1.3) http components jar file into project-> properties-> java

问题 I have a servlet and i want to pass through UrlConnection some objects. When I tested it, it worked fine. When I passed Java native objects ( String , File ..). But when I try to pass my own Object (instance of my own Class), Object is sent into Servlet correctly via ObjectOutputStream but when I wanted to restore object in servlet side it doesn't work. it throws exceptions that My class was not found. I have MyObject class in project with applet where is loaded and sent to servlet and then i

问题 I just came across an error when using NetBeans, and I wanted to post my findings (possible this is old news). Perhaps this will save some people the headache of debugging a similar problem that I just encountered. I don't think I'm abusing anything here... stack overflow's SEO is pretty good :) I refactored a class in NetBeans (JavaFX project), and from that point on I got a "java.lang.NoClassDefFoundError" for that particular refactored class. I fixed the error by simply doing a "Clean and

问题 searching for a long time, but didn't find any answer on that one: I have a server and I have a client. The server should receive an object via ObjectInputStream and ObjectOutputStream . That already works for any class , known on the server. Now I want to send an Object of a class the server doesn't know. He only knows the interface of that class. And that obviously fails... How can I avoid the ClassNotFoundException ? I thought interfaces were the solution. I only want to access the

问题 im trying to migrate my JBOSS 5.1 application to JBOSS 7.0.2. In admin console i select deployments -> add content and my .war and try to enable it. I already resolved some problems, but cant figure out this one: (in short, in long at the end) Caused by: java.lang.ClassNotFoundException: org.springframework.web.context.ContextLoaderListener from [Module "deployment.ZaprogsProject.war:main" from Servic e Module Loader] I copied to JBOSS7\standalone\lib\ the following files: spring-aop-3.0.5

问题 I was having an issue with deserializing an object. The current project has a plugin-style architecture, so I have jars that contain class files that are loaded at runtime. I was unable to deserialize an object that contained a class that was found in one of those jars, so I wrote a quick test method that gets called mid-stream that just loaded the plugins, instantiates the correct one (the object implements a particular interface so I can identify it via .isAssignableFrom(..) ), serializes

问题 Recently, my Xamarin.Android app has started to crash on launch, caused by: Java.Lang.ClassNotFoundException: mono.android.app.Application This exception is being thrown more often than not. Usually, a rebuild fixes the issue for a build or two. I tried to combat the issue by making my own application class: [Application(AllowBackup = true, Debuggable = true, Label = "My Application", Theme = "@style/AppBaseTheme", Icon = "@drawable/icon", Logo = "@drawable/icon")] [MetaData("com.google