hibernate/hibernate-orm · error · IllegalArgumentException
Cannot erase type: " + type
Error message
Cannot erase type: " + type
What it means
Error "Cannot erase type: " + type" thrown in hibernate/hibernate-orm.
Source
Thrown at hibernate-core/src/main/java/org/hibernate/internal/util/GenericsHelper.java:146
* @return The erased type
*/
public static Class<?> erasedType(Type type) {
if ( type instanceof Class<?> clazz ) {
return clazz;
}
else if ( type instanceof ParameterizedType parameterizedType ) {
return erasedType( parameterizedType.getRawType() );
}
else if ( type instanceof TypeVariable<?> typeVariable ) {
return erasedType( typeVariable.getBounds()[0] );
}
else if ( type instanceof GenericArrayType genericArrayType ) {
return genericArrayType.getGenericComponentType() instanceof Class<?> elementClass
? elementClass.arrayType()
: Object[].class;
}
else {
throw new IllegalArgumentException( "Cannot erase type: " + type );
}
}
/**
* Get the type argument of the instantiation of the given generic
* type constructor which is a supertype of the given type expression.
* @param genericType A generic type constructor
* @param implementingType A type expression
* @return The type arguments assigned to parameters of the generic type constructor
*/
public static Type[] typeArguments(Class<?> genericType, Type implementingType) {
if ( genericType.getTypeParameters().length == 0 ) {
return EMPTY_TYPE_ARRAY;
}
else {
final var instantiation =
supertypeInstantiation( genericType, implementingType );
if ( instantiation == null ) {View on GitHub (pinned to fad1729dce)
Solutions
- Pass a Class, ParameterizedType, or GenericArrayType to erase(); other Type kinds (wildcards, type variables) cannot be erased directly.
When it happens
Trigger: Thrown at hibernate-core/src/main/java/org/hibernate/internal/util/GenericsHelper.java:146 when the library encounters an invalid state.
Common situations: See trigger scenarios.
AI-assisted analysis of hibernate/hibernate-orm@fad1729dce (2026-08-22).
Data as JSON: /api/errors/a3588dfc2fa5474a.
Report an issue: GitHub.