java lang classcastexception

Caused by: Java. Lang. classnotfoundexception: XXXXX In loader Dalvik. system. pathclassloader [/data/APP/xxxx.apk] I think we often encounter classnotfoundexception exceptions due to negligence. In Android development, this exception is nothing more than telling you that the class is not found. Why did it fail to be found? In fact, there are two situations: 1. When you start an activity, you may forget to

When uploading, downloading, or filtering files, we may need to use the output stream of the page. For example, in JSP: Response. Reset (); Response. setcontenttype ("application/vnd. MS-excel "); Outputstream OS = response. getoutputstream (); Throw an exception: Error [engine] standardwrappervalve [JSP]: servlet. Service () for servlet JSP threw exception Java. Lang. illegalstateexception: getoutputstream

When codegen1.3 plug-in is used to generate code from the WSDL, an error "An error occurred while completing process-java. Lang. Reflect. invocationtargetexception" occurs. There are two common causes for this error: first, disable eclipse. Note that two errors may occur simultaneously. 1. The jar package is missing. Copy the "geronimo-stax-api_1.0_spec-1.0.1.jar" and "backport-util-concurrent-3.1.jar" fil

Environment JBoss 6.0 + myeclipse 8.6 + MySQL 5.1 + Struts 2.3 + EJB 3.0 Problem When JBoss is started, "Java. Lang. noclassdeffounderror ORG/Apache/commons/lang3/stringutils jar" exception occurs. Solution The commons-lang3-3.1.jar is missing, add this jar to the build path of the project or under webroot/WEB-INF/lib. References Http://snowfigure.diandian.com/post/2012-07-20/40029447675 Http://blog.csdn.

The following error occurs when you use ibatis to query data: Java. Lang. instantiationexception: COM. Mangocity. Contract. EJB. roomtype, which literally means the. roomtype class cannot be instantiated. The roomtype class is used to encapsulate the query results. Each instance represents a query record. The following is a snippet of my ibatis configuration file: Select A. Upload _id as upload ID, A. r

The current apps are all like the popular ones. As long as they are added, the last small app has the chat function, the sharing function, and the camera function, with the voice function ......, If it is powerful enough (or there is a ready-to-use code on the Internet), his mother almost made an operating system. Some of these functions need to be used by third parties. This involves a third-party choice. I generally do not like the products of small companies, rather than look down on small c

Package java. Lang. Reflect; Import sun. Reflect. constructoraccessor;Import sun. Reflect. reflection; /*** Indicates the object of the constructor.** Comment by liqiang** @ Author kenth Russell* @ Author nakul saraiya*/Public finalClass constructor extends accessibleobject implements member { // Declare the class object of this ConstructorPrivate class clazz;Private int slot;// Parameter list ArrayPrivate

Package java. Lang. Reflect; /**** Comment by liqiang** @ Author Peter Jones**/Public interface invocationhandler { /**** The proxy must inherit this interface. When the proxy class calls an interface method, it will go to this method.* The actual implementation method is called using reflection in this method, but other methods can be called before or after this method* Implement a proxy mechanism, such

Package java. Lang. Reflect; Import sun. Reflect. methodaccessor;Import sun. Reflect. reflection; /**** Description method class** Note that the reflection method is first adopted* Class. getmethod (string name, class [] parametertypes) obtains a method object.* String indicates the method name, And parametertypes indicates the type of each parameter in the parameter list.* The method object in the class ob

Today, when I was working on struts, I encountered the java. Lang. nullpointerexception: module 'null' not found error. I was depressed for a long time, The Web. xml file is not configured./WEB-INF/struts-config2.xml If this problem occurs, try this method! It is inconvenient to change eclipse, and it is inconvenient to find the struts plug-in 3.1.2. I still think JBuilder is good...

Java. lang. NoClassDefFoundError: ognl/PropertyAccessor solution, ognl expression I didn't want to write a special article for this article, but I found that no one answered such a simple question. From the perspective of convenient search, I took this question specially. In fact, the solution is to add the jar package of ognl. For example, I use ognl3.0.6, as shown in: Struts2 cannot run. There is a p

Recently, I am working on an e-book project to bring together the open-source shelves + ireader page flip and curl. I encountered the following problems when doing the curl effect: Java. Lang. Unsupported operation exception, Android. View. gles20canvas. clippath (gles20canvas... The omnipotent Gu Ge told me that this is a hardware acceleration problem, but I have never enabled hardware acceleration. I did

Today, we have an appwidget. To determine the WiFi and Bluetooth statuses, it takes some time to change the process status. Therefore, we need to open a thread to determine and then update the interface. A thread is opened directly to call the UPDATE function in the thread. Unfortunately, an error is prompted when you click Add appwidget for the first time. Java. Lang. runtimeexception: can't create handl

Java. Lang. illegalstateexception: getwriter () has already been called for this response Perform the followingCodeAn error is reported, Outputstream out = getresponse (). getoutputstream (); The reason is that response. getwriter () is opened in the Code and is not closed. It is difficult to troubleshoot one by one because there are many call points. View the code and see usingwriter = true in respon

Actually. I made a mistake when calling a function at the DaO layer. I called myself. A java. Lang. stackoverflowerror error occurs in the recently executed project. After a long time, I also asked experts and checked information. Finally, the problem is solved! Special record! Stackoverflowerror is because the current thread's stack is fullWhich is caused by too many function call levels. For example

The external android project is imported to ecplise. The compilation is normal and an error is returned. The logcat is as follows: 12-19 10:55:25. 915: E/AndroidRuntime (2929): fatal exception: main12-19 10:55:25. 915: E/AndroidRuntime (2929): java. lang. noClassDefFoundError: com. guet. siriCN. mainActivity $1 www.2cto. com12-19 10:55:25. 915: E/AndroidRuntime (2929): at com. XXX. mainActivity.

We are integrating perf4j and javasimon Code When I found some problems, that is, I was running good things in my own test code. When I put it in the project code, I always reported the following error :... caused by: Java. lang. illegalargumentexception: superclass has no null constructors but no arguments were given... compared with the code, spring beans with constructor parameters are not found in your

An exception is thrown when you use javamail to send an email: Java. Lang. securityexception: sha1 digest error for COM/Sun/mail/SMTP/smtptransport. Class I am depressed for a long time, and finally found two problems 1. import all jar files in the project (this is not enough. It can be sent at this time, but an exception will always be reported. For the solution, refer to article 2. add all jar files to

The header is finally fixed A backend management system developed based on Struts + hibernate. The functions include complete permission management and information publishing functions.Development Environment: eclipse3.01 + myeclipse3.84 When importing a project to eclipse3.1.1 + myeclipse4.1.x, the system always prompts "the type of Java. Lang. object cannot be parsed. Indirectly referenced it from the r

In a project, the anlr component is required to import the antlr-2.7.2.jar from the Lib of struts 2. After running, the following error is prompted: Java. Lang. nosuchmethoderror: anlr. Collections. Ast. Getline () I So I guess the AST in version 2.7.2 does not use the Getline method. Please try an anlr of a higher version. Import the antlr-2.7.6.jar from the Lib of hibernate 3, and the above error no l