java lang nullpointerexception java

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Java JVM heap size ..... Eclipse java. Lang. outofmemoryerror: Java heap space error

From: http://hi.baidu.com/dearfenix/blog/item/1b0ce80e64ca12ce7bcbe109.html It has always been known that JVM heap size can be set, and Java programs are always written/debugged using eclipse. Run the program by adding parameters on the command line or console. Symptom: In the eclipse configuration file eclipse. set-vmargs-xms500m-xmx1024m in ini. Java still appears when you run or debug some memory-consu

SSH configuration error learning (1)-java. Lang. nosuchmethoderror

Environment: eclipse3.3.0 + myeclipse5.5.1ga (spring2.0 + struts1.1 + hibernate3.1) The error is: Java. Lang. nosuchmethoderrorCode:15:20:54, 093 error contextloader: 203-context initialization failedOrg. springframework. beans. factory. beancreationexception: Error creating bean with name 'sessionfactory 'defined in class path resource [applicationcontext. XML]: Invocation of init method failed; Nested exc

Java BASICS (Exception/in-depth java. Lang. throwable)

Reprinted from: http://www.51edu.com/it/2008/1120/article_3272.html There are several phenomena that need to be summarized:In Java, the base class of the error class is Java. Lang. error, and the base class of the exception class is Java. Lang. Exception.Similarities:

) Java. Lang. outofmemoryerror: Java heap space error and troubleshooting methods (Collection and conversion)

Java. Lang. outofmemoryerror: Java heap Space========================================================== ============== Use JavaProgramAn exception occurred when querying a large amount of data from the database:Java. Lang. outofmemoryerror: Java heap Space This exception

Java in Eclipse: Hello world and Java. Lang. noclassdeffounderror: exception in thread "main"

source code. If classpath is not specified or an error is specified when you run the Java program, the virtual machine cannot find the correct path, and thus the java. Lang. noclassdeffounderror: exception in thread "Main" error occurs. Therefore, when such a similar problem occurs, you should first check whether the classpath has a problem. In addition, when we

Java Heap Overflow java. Lang. outofmemoryerror: Java heap Space

Http://blog.csdn.net/jxzxm1_2/article/details/2499751 An exception occurs when a Java program is used to query a large amount of data from the database:Java. Lang. outofmemoryerror: Java heap SpaceThis exception is thrown if 98% is used for GC and the available heap size is less than 2% in JVM.JVM heap setting refers to the setting of memory space that JVM can a

Java. Lang. unsatisfiedlinkerror: No Java in Java. Library. Path

Today, when I was working on a project, I encountered a problem. I started it normally under tomcat in the bin directory, but an error was reported when I started it under the eclipse directory, and a strange exception was reported. Java. Lang. unsatisfiedlinkerror: No haspjava in Java. Library. Path Later I checked on the internet, need to download a tcnative-

Java. Lang. System

Package java. Lang; Import java. Io .*;Import java. util. properties;Import java. util. propertypermission;Import java. util. stringtokenizer;Import java. Security. accesscontroller;Imp

Android java. lang. StackOverflowError at android. view. ViewGroup. drawChild (ViewGroup. java: 2666), stackoverflowerror

Android java. lang. StackOverflowError at android. view. ViewGroup. drawChild (ViewGroup. java: 2666), stackoverflowerror There are five tabs, slide, data display listview, and no data display animation under this page. At first I saw that many of them were the same and extracted them, use include to include layout files: An error is returned: 01-28 11:27:36.

Java. lang Package Overview (5)

when the index was out of bounds. This exception is thrown when the index value for accessing a sequence is smaller than 0 or greater than or equal to the sequence size. Java. Lang. instantiationexception Instantiation exception. This exception is thrown when an instance of a class is created using the newinstance () method and the class is an abstract class or interface.

Java. Lang. outofmemoryerror: this exception occurs when Java heap space reads a file.

Exception Org. apache. jasper. jasperexception: javax. servlet. servletexception: Java. lang. outofmemoryerror: Java heap spaceorg. apache. jasper. servlet. jspservletwrapper. handlejspexception (jspservletwrapper. java: 505) Org. apache. jasper. servlet. jspservletwrapper. service (jspservletwrapper.

Error querying database. Cause: java. lang. IllegalArgumentException: Mapped Statements collection does not contain value for & hellip;, querying

Error querying database. Cause: java. lang. IllegalArgumentException: Mapped Statements collection does not contain value ..., Querying After compiling and running the web successfully, you do not need to connect to the database on the accessed page. If you do not call the object class through reflection, no error is reported,The error message is as follows: [WARNING]Org. springframework. web. util. NestedS

Addnode. sh failed, log file error PRKC-1025 & amp; java. lang. OutOfMemoryError: Java heap space,

Addnode. sh failed, log file error PRKC-1025 java. lang. OutOfMemoryError: Java heap space,Environment: Linux 5.5 + RAC 11203 Problem description: The command to add a cluster member is as follows: $ GRID_HOME/oui/bin/addNode. sh-silent "CLUSTER_NEW_NODES = {X3850AR}" "CLUSTER_NEW_PRIVATE_NODE_NAMES = {X3850AR-priv}" "CLUSTER_NEW_VIRTUAL_HOSTNAMES = {X3850AR-vip

Java notes (2), java. Lang. byte.

The size of the byte type is 8. At first, we thought it was 1. This value refers to the bit used, rather than the memory size occupied by the object. Byte is the number of symbols,-128 ~ 127. Initialization means that the initial value cannot exceed the indicated range, and an exception is thrown, rather than being truncated by C ++. When the string type is used for initialization, the string cannot be null or "". Otherwise, a numeric formatting exception is thrown. Package tjava. testlang; R

Java. lang. ClassCastException: java. math. BigInteger cannot be

[Java]Java. lang. ClassCastException: java. math. BigInteger cannot be cast to java. lang. LongAt badyflf. action. impl. HibernateProductDao. findByPnum (HibernateProductDao. java: 79)A

Java. Lang layered structure

Class hierarchy Java. Lang.Object Java. Lang.Boolean(Implements java. Lang. Comparable Java. Lang.Character(Implements java. Lang. Comparable

Java. Lang. Reflect package Introduction

. Examples and instructions3.1 search for all methods declared in the classImport java. Lang. Reflect .*; Public class Method1 { Private int F1 ( Object P, int X) throws nullpointerexception { If (P = NULL) Throw new nullpointerexception (); Return X; } Public static void main (string ARGs []) { Try { Class CLS = Clas

WTP/JSF-java. Lang. classnotfoundexception: javax. Faces. webapp. facesservlet

. facesservlet is not found, but I put the class package in classpath, which can be seen in "Libraries" of Eclipse. Why? Why does Tomcat go to WEB-INF/classes to find this file? It took me a whole day to solve this problem. Refer to the two articles1. http://dev.eclipse.org/mhonarc/lists/wtp-jsf-dev/msg00158.html2. http://forum.java.sun.com/thread.jspa? Forumid = 427 threadid = 598929 Step 1:Deploy the jar package in class_path to the WEB-INF directory. This is configured in the properties of t

Java programming things 74 -- Java. lang Package Introduction 1

Java programming things 74 -- Java. lang Package Introduction 1 Chen yuefeng From: http://blog.csdn.net/mailbomb9.4 jdk api package name Overview The entire jdk api contains about 1 or 200 packages. In general, there are three main types of Package Names: Java, javax, and org. The package name starting with

Java. Lang. illegalargumentexception: view not attached to window manager when dismissing Dialog

Exception one,Java. Lang. illegalargumentexception: view not attached to Window ManagerAt Android. View. windowmanagerimpl. findviewlocked (windowmanagerimpl. Java: 664)At Android. View. windowmanagerimpl. removeview (windowmanagerimpl. Java: 354)At Android. View. windowmanagerimpl $ compatmodewrapper. removeview (wind

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