java lang reflect method

When I learned the struts2.0 authoritative guide, I encountered the following error: Configuration complete: the following error occurs: Severe: exception starting filter struts2 Java. Lang. abstractmethoderror: org. Apache. xerces. Dom. entimpl. setxmlversion (ljava/lang/string;) V My configuration is as follows: Five jar packages are used: Commons-loggin-1.1.j

Java. lang. NullPointerException, pointerexception when listView. getChildAt (I) BaseAdapter returns the component that can display the number of items on the current screen. Therefore, it uses listView. getChildAt (I ); The returned result is a widget that can be displayed on the current screen. You cannot use the listView. getChildAt (I) method to retrieve widg

Parameter package There is no getter for property named 'xxx' in 'class java. lang. string' in mybatisgetter I. Problems Found Select num, name, phone from studentAND num = # {num}When you pass in a String to the Mybatis query, There is no getter for property named 'num' in 'class java. lang. string' is reported '. Ii

(string, object...) to format strings: // Format a string containing a date.Import java. util. calendar;Import java. util. gregoriancalendar;Import static java. util. Calendar .*; Calendar c = new gregoriancalendar (1995, May, 23 );String S = string. Format ("Duke's birthday: % 1 $ TM % 1 $ te, % 1 $ ty", C );//-> S = "Duke's birthday: May 23,199 5"

The code for getfreeconnection is as follows: Public connection getfreeconnection (){ // Return the conn class of the database connection to intercept the close method. Connection conn2 = NULL; If (conn instanceof connection ){ Conn2 = (connection) proxy. newproxyinstance (conn. getclass (). getclassloader (), conn. getclass (). getinterfaces (), this ); } Return conn2; } There is no problem with the database driver of mysqlv5. When using the database

Ndk make: *** no rule can be created $ Ndk/ndk-build The above error is generally because Android. mk in your JNI file contains spaces that are not suitable. There may be many reasons for this problem.If this problem occurs, check the Android. mk file and remove all useless spaces. ========================================================== ====================================== Android Ubuntu JNI so error: Java.

Question: 1. In the Java API Doc, I saw the statement below: This integer need not remain consistent from one execution of an application to another execution of the same application. Does it mean that on each execution, the hashcode may be different?But I run this programme (fragment below) sereral times: System. Out. println ("C1 hashcode:" + c1.hashcode (); system. Out. println ("C2 hashcode:" + c2.hashcode ()); They return the same code

Debug with myeclipseCodeWe often add the main method to the Java file for debugging. Sometimes the following errors may occur due to package compatibility problems, resulting in debugging failure: **************************************** ********************** Exception in thread "Main" Java. lang. linkageerror: jaxb

These days I encountered a problem: Java. Lang. unsupportedclassversionerror: bad version number in. class always occurs when I use myeclipse to compile a class! The method on the internet is generally classified as two. One can't find the. Class file, but I have. One said that the JDK version is incorrect, but I found it all according to what they said. No probl

Package java. Lang;Import java. Io .*; /**** Throwable is the parent class of all errors and exceptiong.* Note that there are four constructors:* Throwable ()* Throwable (string message)* Throwable (throwable cause)* Throwable (string message, throwable cause)** Comment by liqiang**/Public class throwable implements serializable {Private Static final long serialv

A piece of code today throws java. Lang. illegalmonitorstateexception. The Code is as follows: private boolean wait = false;public boolean pleaseWait() {synchronized (this.wait) {if (this.wait == true) {return false;}this.wait =true;try {this.wait.wait();} catch (InterruptedException e) {}return true;} The explanation of illegalmonitorstateexception on javadoc is: Thrown to indicate that a thread has atte

When the image size is too large or the number of images is too large, BitmapFactory decoding will produce java. lang. outOfMemoryError: bitmap size exceeds VM budget. To use it properly, you need to allocate less memory. The specific solution is to modify the sample value BitmapFactory. options. inSampleSize, for example, www.2cto.com BitmapFactory. Options opts = new BitmapFactory. Options ();Opts. inSamp

Java. LanG. runtimeexception: Invalid action class configuration that references an unknown class named [xxxaction]. When using SSH for project development, the above error message may appear accidentally. This article summarizes the development experience of Forum experts and analyzes the causes of this error in detail. We hope you can help students with the same problems: This problem can be simply

Package java. Lang. Ref; /*** Reference queue** Comment by liqiang** @ Version 1.20, 01/23/03* @ Author Mark Reinhold* @ SINCE 1.2*/ Public class referencequeue { /*** Constructor*/Public referencequeue (){} // A static internal class used to generate a non-queue or queued flag. This class has no queuing capability.Private Static class null extends referencequeue {Boolean enqueue (reference R ){Return false

Java. lang. ClassCastException: com. sun. proxy. $ Proxy * cannot be cast to *** solution, com. sun. proxy Clinical manifestations: Case: Define proxy class: @ Transactional @ Repositorypublic UserDaoImpl implements UserDao extends BaseDaoImpl {/* No interface is implemented */} Get proxy class: ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");UserDaoImpl userDaoImpl =

ViewPager is used for projects over the past few days, because it can achieve the effect of moving multiple pages left and right, and then When ListView is used on each page, "PagerAdapter java. lang. IllegalStateException" is always displayed during runtime: The specified child already has a parent. You must call removeView ()... "causes The program to end. Displayed on PagerAdapter during debugging: @ Ove

Exception error: HTTP Status 500- Type Exception report Message Description The server encountered an internal error () that prevented it from fulfilli ng this request. Exception org. apache. jasper. JasperException: javax. servlet. ServletException: java. lang. NoSuchMethodError: Method Solution: delete everything in the work folder under the root direct

Error message: org. springframework. beans. factory. BeanCreationException: Error creating bean with name 'userservice' defined in file [F: \ eclipse \ ec_wp \ SpringProgramming0300 \ Bin \ com \ spring \ service \ UserService. class]: Initialization of bean failed; nested exception is org. springframework. beans. factory. BeanCreationException: Error creating bean with name 'Txadvice ': Cannot resolve reference to bean 'txmanager' while setting bean property 'transactionmanager'; nested excepti

The following exception is thrown every time Query query = session. createQuery (hql) is executed: Java. lang. NoSuchMethodError: anlr. collections. AST. getLine () I Whether the two jar packages in the project are conflicted: antlr-2.7.6.jar and anltr-2.7.2.jar. If there is, just remove the anltr-2.7.2.jar package.The reason for smooth execution in the main method