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/OpenJDK 21

Class ClassNotLoadedException

java.lang.Object
java.lang.Throwable
java.lang.Exception
com.sun.jdi.ClassNotLoadedException
All Implemented Interfaces:
Serializable
public class ClassNotLoadedException extends Exception
Thrown to indicate that the requested class has not yet been loaded through the appropriate class loader.

Due to the lazy class linking performed by many VMs, it is possible for a field or variable to be visible in a program before the associated class is loaded. Until the class is loaded all that is available is a signature string. If an attempt is made to set the value of such a field or variable from JDI, the appropriate type checking cannot be done because the destination class has not been loaded. The same is true for the element class of array elements.

It is not advisable to solve this problem by attempting a class load on the fly in this case. There are two problems in having the debugger load a class instead of waiting for it to load over the normal course of events.

  • There can be no guarantee that running the appropriate class loader won't cause a deadlock in loading the class. Class loaders can consist of arbitrary Java programming language code and the class loading methods are usually synchronized. Most of the work done by a debugger happens when threads are suspended. If another application thread is suspended within the same class loader, a deadlock is very possible.
  • Changing the order in which classes are normally loaded may either mask or reveal bugs in the application. An unintrusive debugger should strive to leave unchanged the behavior of the application being debugged.
To avoid these potential problems, this exception is thrown.

Note that this exception will be thrown until the class in question is visible to the class loader of enclosing class. (That is, the class loader of the enclosing class must be an initiating class loader for the class in question.) See The Java Virtual Machine Specification for more details.

Since:
1.3
See Also:

Constructor Summary

Constructor Description
ClassNotLoadedException(String className)
ClassNotLoadedException(String className, String message)

Method Summary

Modifier and Type Method Description
String className()

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

ClassNotLoadedException

public ClassNotLoadedException(String className)

ClassNotLoadedException

public ClassNotLoadedException(String className, String message)

Method Details

className

public String className()

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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
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https://docs.oracle.com/en/java/javase/21/docs/api/jdk.jdi/com/sun/jdi/ClassNotLoadedException.html