LinkageError

AI-generated Key Takeaways

• LinkageError is a subclass of Error and signals that a class has a dependency on another class that has incompatibly changed after compilation.

• It has several direct subclasses including ClassCircularityError, ClassFormatError, and NoClassDefFoundError, each addressing specific linkage issues.

• LinkageError also has indirect subclasses like AbstractMethodError and NoSuchMethodError, further detailing the type of incompatibility.

• It provides constructors to create instances with or without detailed messages and causes.

• Inherited methods from Throwable and Object offer functionalities like stack trace retrieval, error message handling, and object management.

public class LinkageError extends Error

Known Direct Subclasses ClassCircularityError, ClassFormatError, ExceptionInInitializerError, IncompatibleClassChangeError, NoClassDefFoundError, UnsatisfiedLinkError ClassCircularityError Thrown when the Java Virtual Machine detects a circularity in the superclass hierarchy of a class being loaded.  ClassFormatError Thrown when the Java Virtual Machine attempts to read a class file and determines that the file is malformed or otherwise cannot be interpreted as a class file.  ExceptionInInitializerError Signals that an unexpected exception has occurred in a static initializer.  IncompatibleClassChangeError Thrown when an incompatible class change has occurred to some class definition.  NoClassDefFoundError Thrown if the Java Virtual Machine or a ClassLoader instance tries to load in the definition of a class (as part of a normal method call or as part of creating a new instance using the new expression) and no definition of the class could be found.  UnsatisfiedLinkError Thrown if the Java Virtual Machine cannot find an appropriate native-language definition of a method declared native.

Known Indirect Subclasses AbstractMethodError, GenericSignatureFormatError, IllegalAccessError, InstantiationError, NoSuchFieldError, NoSuchMethodError, UnsupportedClassVersionError AbstractMethodError Thrown when an application tries to call an abstract method.  GenericSignatureFormatError Thrown when a syntactically malformed signature attribute is encountered by a reflective method that needs to interpret the generic signature information for a type, method or constructor.  IllegalAccessError Thrown if an application attempts to access or modify a field, or to call a method that it does not have access to.  InstantiationError Thrown when an application tries to use the Java new construct to instantiate an abstract class or an interface.  NoSuchFieldError Thrown if an application tries to access or modify a specified field of an object, and that object no longer has that field.  NoSuchMethodError Thrown if an application tries to call a specified method of a class (either static or instance), and that class no longer has a definition of that method.  UnsupportedClassVersionError Thrown when the Java Virtual Machine attempts to read a class file and determines that the major and minor version numbers in the file are not supported.

Subclasses of LinkageError indicate that a class has some dependency on another class; however, the latter class has incompatibly changed after the compilation of the former class.

Public Constructor Summary

	LinkageError() Constructs a LinkageError with no detail message.
	LinkageError(String s) Constructs a LinkageError with the specified detail message.
	LinkageError(String s, Throwable cause) Constructs a LinkageError with the specified detail message and 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 LinkageError ()

Constructs a LinkageError with no detail message.

public LinkageError (String s)

Constructs a LinkageError with the specified detail message.

Parameters

s	the detail message.

public LinkageError (String s, Throwable cause)

Constructs a LinkageError with the specified detail message and cause.

Parameters

s	the detail message.
cause	the cause, may be null