ReflectiveOperationException

AI-generated Key Takeaways

• ReflectiveOperationException is the common superclass for exceptions thrown during reflective operations in Java's core reflection.

• It's a checked exception, meaning it must be explicitly handled in your code using try-catch blocks or declared in the method signature.

• Several well-known exceptions like ClassNotFoundException, IllegalAccessException, and NoSuchMethodException are subclasses of ReflectiveOperationException.

• These exceptions typically arise when using reflection to access or manipulate classes, fields, or methods that are not accessible or do not exist.

• Reflective operations can be powerful but should be used cautiously as they can bypass security restrictions and lead to unexpected behavior if not handled correctly.

public class ReflectiveOperationException extends Exception

Known Direct Subclasses ClassNotFoundException, IllegalAccessException, InstantiationException, InvocationTargetException, NoSuchFieldException, NoSuchMethodException ClassNotFoundException Thrown when an application tries to load in a class through its string name using: The forName method in class Class.  IllegalAccessException An IllegalAccessException is thrown when an application tries to reflectively create an instance (other than an array), set or get a field, or invoke a method, but the currently executing method does not have access to the definition of the specified class, field, method or constructor.  InstantiationException Thrown when an application tries to create an instance of a class using the newInstance method in class Class, but the specified class object cannot be instantiated.  InvocationTargetException InvocationTargetException is a checked exception that wraps an exception thrown by an invoked method or constructor.  NoSuchFieldException Signals that the class doesn't have a field of a specified name.  NoSuchMethodException Thrown when a particular method cannot be found.

Common superclass of exceptions thrown by reflective operations in core reflection.

See Also

• LinkageError

Public Constructor Summary

	ReflectiveOperationException() Constructs a new exception with null as its detail message.
	ReflectiveOperationException(String message) Constructs a new exception with the specified detail message.
	ReflectiveOperationException(String message, Throwable cause) Constructs a new exception with the specified detail message and cause.
	ReflectiveOperationException(Throwable cause) Constructs a new exception with the specified cause and a detail message of (cause==null ? null : cause.toString()) (which typically contains the class and detail message of cause).

Inherited Method Summary

From class java.lang.Throwable

synchronized final void	addSuppressed(Throwable exception) Appends the specified exception to the exceptions that were suppressed in order to deliver this exception.
synchronized Throwable	fillInStackTrace() Fills in the execution stack trace.
synchronized Throwable	getCause() Returns the cause of this throwable or null if the cause is nonexistent or unknown.
String	getLocalizedMessage() Creates a localized description of this throwable.
String	getMessage() Returns the detail message string of this throwable.
StackTraceElement[]	getStackTrace() Provides programmatic access to the stack trace information printed by printStackTrace().
synchronized final Throwable[]	getSuppressed() Returns an array containing all of the exceptions that were suppressed, typically by the try-with-resources statement, in order to deliver this exception.
synchronized Throwable	initCause(Throwable cause) Initializes the cause of this throwable to the specified value.
void	printStackTrace() Prints this throwable and its backtrace to the standard error stream.
void	printStackTrace(PrintWriter s) Prints this throwable and its backtrace to the specified print writer.
void	printStackTrace(PrintStream s) Prints this throwable and its backtrace to the specified print stream.
void	setStackTrace(StackTraceElement[] stackTrace) Sets the stack trace elements that will be returned by getStackTrace() and printed by printStackTrace() and related methods.
String	toString() Returns a short description of this throwable.

From class java.lang.Object

Object	clone() Creates and returns a copy of this Object.
boolean	equals(Object obj) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of Class that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long timeout, int nanos) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait(long timeout) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.

Public Constructors

public ReflectiveOperationException ()

Constructs a new exception with null as its detail message. The cause is not initialized, and may subsequently be initialized by a call to Throwable.initCause(Throwable).

public ReflectiveOperationException (String message)

Constructs a new exception with the specified detail message. The cause is not initialized, and may subsequently be initialized by a call to Throwable.initCause(Throwable).

Parameters

message	the detail message. The detail message is saved for later retrieval by the Throwable.getMessage() method.

public ReflectiveOperationException (String message, Throwable cause)

Constructs a new exception with the specified detail message and cause.

Note that the detail message associated with cause is not automatically incorporated in this exception's detail message.

Parameters

message	the detail message (which is saved for later retrieval by the Throwable.getMessage() method).
cause	the cause (which is saved for later retrieval by the Throwable.getCause() method). (A null value is permitted, and indicates that the cause is nonexistent or unknown.)

public ReflectiveOperationException (Throwable cause)

Constructs a new exception with the specified cause and a detail message of (cause==null ? null : cause.toString()) (which typically contains the class and detail message of cause).

Parameters

cause	the cause (which is saved for later retrieval by the Throwable.getCause() method). (A null value is permitted, and indicates that the cause is nonexistent or unknown.)