Java Summary: common Java exception classification table http://webservices.ctocio.com.cn/java/64/9361564_1.shtml

Java. Lang. virtualmachineerror

Virtual Machine error. Indicates that the virtual machine is damaged or the resources required to continue the operation are insufficient.

Java. Lang. arithmeticexception

Arithmetic condition exception. For example, integer division by zero.

Java. Lang. arrayindexoutofboundsexception

An error occurred while exiting the array index. If the index value of the array is negative or greater than or equal to the size of the array, throw.

Java. Lang. arraystoreexception

An error occurred while storing the array. It is thrown when a non-array declared object is stored in the array.

Java. Lang. classcastexception

Class styling exception. Suppose there are classes A and B (A is not the parent class or subclass of B), and O is the instance of A, then this exception is thrown when an instance of Class B is forcibly constructed by O. This exception is often called a forced type conversion exception.

Java. Lang. classnotfoundexception

Class exception not found. This exception is thrown when the application tries to construct a class based on the class name in the string format and cannot find the class file with the corresponding name after traversing the classpah.

Java. Lang. clonenotsupportedexception

Clone exceptions are not supported. If the cloneable interface is not implemented or the clone method is not supported, this exception is thrown when the clone () method is called.

Java. Lang. enumconstantnotpresentexception

The enumerated constant does not exist. This exception is thrown when an application attempts to access an enumeration object by name or enumeration type, but this enumeration object does not contain constants.

Java. Lang. Exception

Root exception. Used to describe what the application wants to capture.

Java. Lang. illegalaccessexception

Illegal access exception. When an application tries to create an instance of a class, access this class attribute, and call this class method through reflection, at that time, the exception could not be thrown when defining the category, attribute, method, or constructor.

Java. Lang. illegalmonitorstateexception

Illegal monitoring status exception. This exception is thrown when a thread tries to wait for a monitor of an object (o) that it does not own or notifies other threads to wait for the monitor of this object (o.

Java. Lang. illegalstateexception

Illegal status exception. If a method is called while the Java environment and application are not in the valid call state of a method, this exception is thrown.

Java. Lang. illegalthreadstateexception

The invalid thread status is abnormal. When the county seat is not in the valid call status of a method and the method is called, an exception is thrown.

Java. Lang. indexoutofboundsexception

An exception occurred 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. interruptedexception

Aborted exception. This exception is thrown when a thread is in a long wait, sleep, or other pause State and other threads terminate the thread through the interrupt method of the thread.

Java. Lang. negativearraysizeexception

An error occurred while the array size is negative. This exception is thrown when an array is created with a negative value.

Java. Lang. nosuchfieldexception

The property does not exist. This exception is thrown when you access a non-existent attribute of a class.

Java. Lang. nosuchmethodexception

Method does not have an exception. This exception is thrown when a method that does not exist to access a class.

Java. Lang. nullpointerexception

Null Pointer exception. This exception is thrown when the application tries to use null where the object is required. For example, call the instance method of the null object, access the attribute of the null object, calculate the length of the null object, and throw null using the throw statement.

Java. Lang. numberformatexception

The number format is incorrect. This exception is thrown when you try to convert a string to a specified numeric type that does not meet the numeric type requirements.

Java. Lang. runtimeexception

Exception during running. It is the parent class of all exceptions that can be thrown during normal operations of Java virtual machines.

Java. Lang. securityexception

Security exception. Thrown by the security manager to indicate exceptions that violate security conditions.

Java. Lang. stringindexoutofboundsexception

An exception occurred when the string index was out of bounds. If the index value is used to access a character in a string and the index value is smaller than 0 or greater than or equal to the sequence size, this exception is thrown.

Java. Lang. typenotpresentexception

Type does not exist. When an application attempts to access a type by using a string expression of a type name, but cannot find the type based on the given name, this exception is thrown. This exception differs from classnotfoundexception because it is an unchecked (not checked) exception, while classnotfoundexception is a checked (checked) exception.

Java. Lang. unsupportedoperationexception

The method is not supported. Exception that indicates that the requested method is not supported.

Exception

Javax. servlet. jsp. jspexception: cannot retrieve mapping for action/login (/login is your action name)

Possible causes

Action is no longer defined in the struts-config.xml, or no matching action is found, for example, used in a JSP file.

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