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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
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 record-87-java. lang. reflect. ArrayThe java. lang. reflect. Array class provides various static methods for dynamically creating and accessing Array elements.
Import java. lang. r
Take the tomcat environment as an example. Other WEB servers, such as jboss and weblogic, share the same principle.1. java. lang. OutOfMemoryError: PermGen spacePermGen space stands for Permanent Generation space, which is the Permanent storage area of the memory,This memory is mainly used by JVM to store Class and Meta information. When the Class is loaded, it will be placed in PermGen space,Unlike the Hea
Java. Lang. outofmemoryerror: Java heap space and its processing
During development, JavaProgramAn exception occurred when querying a large amount of data from the database:Java. Lang. outofmemoryerror: Java heap Space
This exception is thrown if 98% is used for GC and t
The root cause of this problem is that the default heap size of the JVM virtual machine is 64 MB, which can be achieved by setting the maximum and minimum values. There are several ways to set the heap size.
1. You can add java_opts =-xms64m-xmx512m to change the system environment variable in windows.
2. If Tomcat is used, in windows, add: e: \ Program Files \ apache-Tomcat-6.0.29 \ bin \ Catalina. BAT:
Set java_opts =-xms512m-xmx512m
The location is added to the row REM guess catali
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
Java. lang. OutOfMemoryError
Cause:The following are common examples:
1. The amount of data loaded in the memory is too large, such as extracting too much data from the database at a time;
2. There are references to objects in the Collection class, which are not cleared after use, so that JVM cannot be recycled;
3. There are endless loops or loops in the code that generate too many repeated object entities
From: http://hi.baidu.com/cjxgotofly/blog/item/ef981434e2e112355ab5f55f.html
Java. Lang. outofmemoryerrorTroubleshooting
Cause:The following are common examples:
1. The amount of data loaded in the memory is too large, such as extracting too much data from the database at a time;
2. There are references to objects in the Collection class, which are not cleared after use, so that JVM cannot be
Start learning Java and write some code to demonstrate the main functions and function usage of each class.
The basic idea is to create a package structure based on the Java source code package structure and write a demo class for each class.
My basic classes:
Package tjava. testlang;
DEMO code of the Boolean class:
Package tjava. testlang;
Verification class:
Import tjava. testlang. *;
Other classe
Package java. Lang. Reflect;
Import sun. Reflect. constructoraccessor;Import sun. Reflect. reflection;
/*** Indicates the object of the constructor.** Comment by liqiang** @ Author kenth Russell* @ Author nakul saraiya*/Public finalClass constructor extends accessibleobject implements member {
// Declare the class object of this ConstructorPrivate class clazz;Private int slot;// Parameter list ArrayPrivate
Package java. Lang. Reflect;
Import sun. Reflect. methodaccessor;Import sun. Reflect. reflection;
/**** Description method class** Note that the reflection method is first adopted* Class. getmethod (string name, class [] parametertypes) obtains a method object.* String indicates the method name, And parametertypes indicates the type of each parameter in the parameter list.* The method object in the class ob
Several common exceptions during Spring development (3): java. lang. classCastException: com. sun. proxy. $ Proxy4 cannot be cast to com.edu. aop. arithmeticCalculatorImpl at com.edu. aop. main. main (Main. java: 11 ),
This exception was encountered during Spring case development.
Paste the complete exception information:
Exception in thread "main" java.lang.Clas
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
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"
In the past few days, a part-time employee's information entry system has encountered an error where hibernate cannot query the specified condition data. Now we can find a solution:
The error message is as follows:HTTP status 500-
--------------------------------------------------------------------------------
Type exception report
Message
Description the server encountered an internal error () that prevented it from fulfilling this request.
Exception
Java
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