java lang nullpointerexception java

Java. lang. NoClassDefFoundError: org/jboss/util/file/ArchiveBrowser $ FilterAt org. hibernate. ejb. HibernatePersistence. createEntityManagerFactory (HibernatePersistence. java: 119)At javax. persistence. Persistence. createEntityManagerFactory (Persistence. java: 83)At javax. persistence. Persistence. createEntityMan

Link: http://blog.csdn.net/kongxx/article/details/7029430 Recently, the build of some original engineering in Porting ranges from ant to maven. Because the project is too large, many tree-structured projects have been created. At this time, during compilation, "Java. lang. outofmemoryerror: Java heap space "error, resulting in compilation failure. This error has

The weather is good today, and the sleep is messy. --- Xingyunpi Tossing alumnus system because the data volume is too large, it's really hard to figure out something... when running yesterday, a sudden error occurs, Java. lang. outofmemoryerror: Java heap space, which is obviously out of memory and then checked on the network. There are a lot of solutions. The r

Java reflection (java. lang. reflect ), 1. Ordinary full and hungry Chinese Package org. bighead. test2; public class TestPrivate {private String str = "strPrivate"; private static final TestPrivate TESTPRIVATE = new TestPrivate (); // full Chinese and hungry Chinese private TestPrivate () {super (); System. out. println (str);} public TestPrivate getInstance ()

and assign a value to an object to write the collation for the custom class in the Compare method2. Passing a Comparator object as a parameter to a method of the Sort class3. Add the custom class used in the Compare method to the Sort classExamples of interface operations:Import Java.util.arraylist;import Java.util.collections;import Java.util.comparator;public class Car {public String name;public int price;public Car (String name, int price) {this.name = Name;this.price = Price;} Public String

When I started my computer at work in the morning, I found a problem with the application startup. The prompt was: Java. Lang. noclassdeffounderror: javax/transaction/transactionmanager. So I googled it and it turned out to be missing JTA. jar. It's strange that it was good. Why is it missing today? Is there a problem with eclipse. JTA. jar: 1, http://java.sun.com/products/jta/ download class files, and th

Package java. Lang. Reflect; Import java. Lang. Ref .*;Import java. util .*; Import sun. Misc. proxygenerator; /*** Example of using proxy*Interface TT {String getst ();} Class STT implements TT {Public String getst (){Return "lqtest ";}} Class myhandler implements invocatio

An error occurred when Tomcat was started today. Severe: end event threw exceptionJava. Lang. illegalargumentexception: Can't convert argument: NULLAt org. Apache. tomcat. util. introspectionutils. Convert (introspectionutils. Java: 999)At org. Apache. tomcat. util. digester. callmethodrule. End (callmethodrule. Java: 523)At org. Apache. tomcat. util. digester. R

Java. Lang. exceptionininitializererror Initialization program error. Thrown when an exception occurs during the execution of a class static initialization program. Static initialization programs are static statement segments directly included in the class. Java. Lang. illegalaccesserror Illegal access error. This exce

Warn [ejb3configuration] persistence provider caller does not implement the ejb3 spec correctly. persistenceunitinfo. getnewtempclassloader () is null.09:09:13, 891 error [abstractkernelcontroller] Error installing to start: Name = persistence. Unit: unitname = # ejbdb state = createJava. Lang. nosuchmethoderror: org. hibernate. cfg. annotationconfiguration. setproperty (ljava/lang/string;) lorg/hibernate/C

javaBeans Java. lang Provides basic classes for java programming. Java.net Provides classes related to network operations. Java. nio Class that provides a buffer for Input and Output Java. text Provides classes and interfaces

Java. Lang. noclassdeffounderror Solution (01:14:03) Reprinted Javanoclassdeffound Take the simple and classic "helloworld. Java" as an Example Helloworld. Java without package Layers Public class helloworld { Public static void main (string [] ARGs) { System. Out. println ("Hello world! "); } }

Why JAVA. Lang. unsatisfiedlinkerror: CC error occurs in the 2ee engine (11:03:29) Tags: Report software report Tool Web report software download it wishful report Category: Basic Concepts Java. Lang. unsatisfiedlinkerror is displayed on the "run JSP Report Program" page. The following reasons and sol

Exception in thread "main" java. lang. NoClassDefFoundError: org/apache/commons/logging/LogFactory, commonslogfactory An exception occurred when learning Spring AOP from scratch when I was writing a Java Web framework: "C: \ Program Files \ Java \ jdk1.7.0 _ 40 \ bin \ java"

Use struts2 for file upload today: I don't know why, but I always report the following exceptions: /-- Encapsulated exception ------------\Java. Lang. nosuchmethodexception: org. soueasy. behindaction. resourcemanageraction. setfile ([ljava. Lang. String ;)At ognl. ognlruntime. callappropriatemethod (ognlruntime. Java