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 widgets other than those that can be displayed on
The Java language API between des a special class named object that is the root
Class of the entire Java hierarchy. The object class, found in the Java. lang package,
Is the parent of every Java class, either directly (meaning the class is
Immediate Child of object) or indir
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Endorsed standards classes deployment
When myeclipse integrates jboss5.0 and starts JBoss, the following API error message is displayed:
Java. lang. linkageerror: jaxb 2.1 API is being loaded from the bootstrap classloader, but this RI (from jar: file:/E: /Java/Apache-Tomcat-6.0.26/webapps/ejbclient/WEB-INF/lib/jaxb-impl.jar!
(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"
was reminded by a colleague's remark. In fact, Himi on the Android side of the development compared to a lot less. The introduction of jars, I introduce problems caused by.Later I re-introduced Android-async-http-x.x.x.jar by the following steps to resolve:Right-click on the Android project under the Libs->import->general->file system->browse ...* This jar package is cocos2dx/cocos/platform/android/java/libs under the projectCheck Select Libs->finish
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 2.0 API is being loaded from the bootstrap cl
Today, I am running the normal Play framwork 2.0 project on the server, the following error occurs [plain] [info] Compiling 25 Scala sources and 1 Java source to/home/admin/git/project/target/scala-2.9.1/classes... [error] {file:/home/admin/git/project/} project/compile: java. lang. stackOverflowError [error] Total time: 19 s, completed 15:35:14 google, mostly be
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
Most of the content in this article is taken from the following two articles:
Http://blog.xebia.com/2007/10/04/leaking-memory-in-java /,
Http://www.iteye.com/topic/626801
Use an extreme example to illustrate the outofmemoryerror caused by the string substring method:
public class TestGC { private String large = new String(new char[100000]); public String getSubString() { return this.large.substring(0,2); } public static void
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.
done after your reference,
Here I will only talk about solutions that may cause problems.
After writing the code, run, test, and an exception occurs:
Java. lang. noclassdeffounderror: ORG/Apache/Oro/text/perl/perl5util
The following error message indicates that the class definition is missing: ORG/Apache/Oro/text/perl/perl5util.
And this class exists with the jakarta-oro.jar package, this package g
1. The error "Java. Lang. classnotfoundexception: COM. Microsoft. JDBC. sqlserver. sqlserverdriver" is displayed:
The final cause may be as follows:
1. SQL Server 2000 driver for JDBC is not installed
2. Pay attention to you after installationProgramWhether the package of the class has imported three files under the Lib file after the SQL Server 2000 driver for JDBC program is installed:
C:/program file
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
Error message exception in thread "Main" Java. lang. exceptionininitializererrorat Org. hibernate. cfg. configuration. reset (configuration. java: 330) at Org. hibernate. cfg. configuration. My little hibernatedemo example (hibernate3.6.0) has not been changed. I just changed a setting of eclipse Jee 3.6. As shown in the following figure: When you add the user li
An exception occurs after one-to-multiple bidirectional Association of @ onetovers using spring + hibernate Annotations:Java. Lang. nosuchmethoderror: javax. Persistence. oneto133. orphanremoval () ZThis exception usually occurs because the Java ee. Jar version of myeclipse is relatively low, and conflicts with the built-in JPA such as hibernate.
Some processing methods on the Internet are to delete the
Lab environment: JDK 1.6, Axis2-1.3, using SSL/TLS (one-way/two-way authentication), Tomcat 5.5/glassfish v2
When you use SSL/TLS to access the Web Service of axis2, the following error occurs:Exception in thread "Main" org. Apache. axis2.axisfault: Java. Lang. nullpointerexception
This error is caused by the use of transportsession in the created web service-in service. xml:Transportsession">For solution
Java. Lang. noclassdeffounderror: org. ksoap2.serialization. soapobject
This is becauseProgramThe Org. ksoap2.serialization. soapobject package is not marked or is not completed.
1. In project properties, right-click the project
Check whether the corresponding package is marked in Java build path --> libraries.
2. In order and export, select the correspondi
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
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 problem, it is 1.6. Myeclipse is also set to 6.0.
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