java lang nullpointerexception java

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Java. lang. ExceptionInInitializerError exception,

Java. lang. ExceptionInInitializerError exception, During the development process today, Baidu encountered an exception in java. lang. ExceptionInInitializerError. If an unexpected exception occurs in the static initialization program, the ExceptionInInitializerError is thrown, indicating that an exception occurs durin

Error java. Lang. illegalargumentexception: parameter must be a descendant of this view Solution

Bug information: 10-16 17:27:20. 250: D/androidruntime (14662): Shutting Down VM10-16 17:27:20. 250: W/dalvikvm (14662): threadid = 1: thread exiting with uncaught exception (group = 0x40a5e228)10-16 17:27:20. 250: E/androidruntime (14662): Fatal exception: Main10-16 17:27:20. 250: E/androidruntime (14662): Java. Lang. illegalargumentexception: parameter must be a descendant of this view10-16 17:27:20. 250:

Java. lang. IllegalArgumentException: already added: Lorg/apache/poi/encryptedincluentexception;

Java. lang. IllegalArgumentException: already added: Lorg/apache/poi/encryptedincluentexception;[11:38:23-RollCallSystem] Dx at com. android. dx. dex. file. ClassDefsSection. add (ClassDefsSection. java: 123)[11:38:23-RollCallSystem] Dx at com. android. dx. dex. file. DexFile. add (DexFile. java: 143)[11:38:23-RollCall

Java. Lang. illegalstateexception: getoutputstream () has already been called for this response

When I did the graphic verification code, I randomly found a segment of code from the Internet. The result showed this exception. The details are as follows: ( 4361578 MS) [HTTP - 8080 - Processor25] error: org. Apache. Catalina. Core. containerbase. [Catalina]. [localhost]. [ / Xixibar]. [JSP] # invoke: servlet. Service () For Servlet JSP threw exception Java. Lang. illegalstateexception: getoutputstream

Java. Lang. securityexception

Exception in thread "Main" Java. Lang. securityexception: Class "org. Eclipse. SWT. Widgets. ufccomposite"'s signer information does not match signer information of other classes in the spackame Under what circumstances can this exception occur?When you define a class in your own program that is the same as the built-in system (such as JDK and other libraries.For example, defineJava.

Java. Lang. classcastexception: $ proxy17 cannot be cast to *. Service. impl. deviceservice

Error: Java. lang. classcastexception: $ proxy17 cannot be cast *. *. *. service. impl. deviceserviceat *. *. *. service. impl. deviceservicetest. testdeviceisonline (deviceservicetest. java: 436) at Sun. reflect. nativemethodaccessorimpl. invoke0 (native method) at Sun. reflect. nativemethodaccessorimpl. invoke (nativemethodaccessorimpl.

Tomcat cannot be started. Error: Java. Lang. noclassdeffounderror: ORG/Apache/Juli/logging/logfactory (zt)

Tomcat cannot be started. The following error occurs: Java. Lang. noclassdeffounderror: ORG/Apache/Juli/logging/logfactory. 15:58:46 | category: Tomcat | label: Juli Java Lang Apache org | font size subscription Some time ago, I saw several beta versions of tomcat7.0 released. I didn't test it because it was not stable

Java. Lang. illegalargumentexception: No bean specified

Use struts1, And the actionform class is as follows: Private string menutype; private clientuser user;... corresponding get and set methods... The action class is as follows: Public actionforward execute (actionmapping mapping, actionform form, httpservletrequest request, httpservletresponse response) {system. out. println ("========= enter the userinfoaction class =========="); userinfoform = (userinfoform) form ;} However, when submitting a form, you may encounter the following problems: ====

About java. Lang. classnotfoundexception: org. springframework. Web. Context. contextloaderlistener

This problem occurs when Tomcat is started when struts2 + hibernate + spring is set up. Severe: Error Handling ing application listener of class org. springframework. Web. Context. contextloaderlistenerJava. Lang. classnotfoundexception: org. springframework. Web. Context. contextloaderlistenerAt org. Apache. Catalina. loader. webappclassloader. loadclass (webappclassloader. Java: 1358)At org. Apache. Catal

Java. Lang. classnotfoundexception: org. Apache. Struts. Action. actionservlet

Problem description: serious: Servlet/Library Management System threw load () exception Java. Lang. classnotfoundexception: org. Apache. Struts. Action. actionservlet At org. Apache. Catalina. loader. webappclassloader. loadclass (webappclassloader. Java: 1714) At org. Apache. Catalina. loader. webappclassloader. loadclass (webappclassloader.

Java. Lang. noclassdeffounderror: Android. OS. strictmode $ threadpolicy $ Builder

. onitemclick (listfragment. Java: 53) 09-04 16:15:34. 592: Debug/strictmode (15883): at Android. widget. adapterview. Adjust mitemclick (adapterview. Java: 282) 09-04 16:15:34. 592: Debug/strictmode (15883): at Android. widget. abslistview. Adjust mitemclick (abslistview. Java: 1037) 09-04 16:15:34. 592: Debug/strictmode (15883): at Android. widget. abslistview

Tomcat java. Lang. outofmemoryerror: permgen Space and Its Solution

, such as JBoss and WebLogic, share the same principle. I. java. lang. outofmemoryerror: The full name of permgen space is permanent generation space, which refers to the permanent storage area of the memory. This memory is mainly used by JVM to store class and meta information, when a class is loaded, it will be placed in the permgen space. It is different from the heap region where the class instance is s

When classloader is used, the following error occurs: Java. Lang. noclassdeffounderror

When classloader is used to load resources, the following errors often occur: Exception in thread "Main" Java. Lang. noclassdeffounderror: COM/tools/resultAt java. Lang. Class. getdeclaredconstructors0 (native method)At java. Lang

Java. Lang. numberformatexception: for input string: "0"

Java. lang. numberformatexception: for input string: "1.0" at java. lang. numberformatexception. forinputstring (numberformatexception. java: 48) at java. lang. integer. parseint (integ

WebSphere 8.5 reports java. Lang. verifyerror: jvmvrfy007 final method overridden; Class = net/SF/cglib/CORE/de

The error details are as follows:: [6/27/13 15: 54: 49: 679 CST] 00000043 systemout o error-An error occurred while obtaining the instance of the specified object [appendixmgr! Check the configuration file! -Com. TRS. dreamfactory. createobjectbyid (dreamfactory. java: 79) Org. springframework. beans. factory. beancreationexception: Error creating bean with name 'appendixmgr 'defined in file [/opt/IBM/WebSphere/appserver/profiles/invalid rv06/installe

Tomcat java. Lang. outofmemoryerror: permgen Space

Tomcat outofmemoryerror (permgen space) Solution Recently I have been familiar with a project that has been developed for several years. I need to port the database from MySQL to Oracle. First, I need to point the JDBC connection to MySQL and package it into tomcat to run it. There is no problem, however, when the JDBC connection is directed to Oracle, Tomcat continuously throws Java. lang. outofmemoryerro

IntentService exception: java. lang. InstantiationException:, intentservice

IntentService exception: java. lang. InstantiationException:, intentservice public MyIntentService() { super(nameStr); } JavalangInstantiationException in java reflection: exception, solved The error KEY is used for instantiation, and the VALUE is used for instantiation.String val = prop. getProperty (name );ObjectPool. put (name, createObje

Problem: java. lang. IllegalArgumentException: the bind value at index is null

Today I encountered such a problem and solved it. I know what is going on. Java. lang class IllegalArgumentExceptionjava. lang. Object java. lang. Throwable java. lang. Exception

Java. Lang. linkageerror: loader constraints violated when linking javax/El/expressionfactory class

Severe: servlet. Service () for servlet JSP threw exception Java. Lang. linkageerror: loader constraints violated when linking javax/El/expressionfactory class At org. Apache. jsp. login_jsp. _ jspinit (login_jsp.java: 23)At org. Apache. Jasper. runtime. httpjspbase. INIT (httpjspbase. Java: 52)At org. Apache. Jasper. servlet. jspservletwrapper. getservlet (jspse

Java. Lang. illegalstateexception: No webapplicationcontext found: No contextloaderlistener registered

Sometimes this problem occurs when the program is running. Here, it is caused by the path problem, Let's see what I changed. Protected object getobj (string beanname) { Here, because I used the original method to obtain the path. XML also configures the path listening, but sometimes it cannot be obtained, which may cause such problems, I hope you can pay more attention to it. Severe: servlet. Service () for servlet assoecservlet threw exceptionJava. Lang

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