| Name | Package | Description |
| IllegalClassException | org.apache.commons.lang | Thrown when an object is an instance of an unexpected type (a class or interface). |
| IncompleteArgumentException | org.apache.commons.lang | Thrown to indicate an incomplete argument to a method. |
| NestableException | org.apache.commons.lang.exception | The base class of all exceptions which can contain other exceptions. |
| NestableRuntimeException | org.apache.commons.lang.exception | The base class of all runtime exceptions which can contain other
exceptions. |
| NotImplementedException | org.apache.commons.lang | Thrown to indicate that a block of code has not been implemented. |
| NullArgumentException | org.apache.commons.lang | Thrown to indicate that an argument was null and should
not have been. |
| SerializationException | org.apache.commons.lang | Exception thrown when the Serialization process fails. |
| UnhandledException | org.apache.commons.lang | Thrown when it is impossible or undesirable to consume or throw a checked exception. |