{"record":{"id":"2a35af497d4826b3","repo":"hibernate/hibernate-orm","slug":"no-support-for-parsing-usertype-values-from-string-2a35af","errorCode":null,"errorMessage":"No support for parsing UserType values from String: {}","messagePattern":"No support for parsing UserType values from String: (.+?)","errorType":"exception","errorClass":"UnsupportedOperationException","httpStatus":null,"severity":"error","filePath":"hibernate-core/src/main/java/org/hibernate/type/internal/UserTypeJavaTypeWrapper.java","lineNumber":117,"sourceCode":"\t\treturn comparator;\n\t}\n\n\t@Override\n\tpublic int extractHashCode(J value) {\n\t\treturn userType.hashCode(value );\n\t}\n\n\t@Override\n\tpublic boolean areEqual(J one, J another) {\n\t\treturn userType.equals( one, another );\n\t}\n\n\t@Override\n\tpublic J fromString(CharSequence string) {\n\t\tif ( userType instanceof EnhancedUserType<J> enhancedUserType ) {\n\t\t\treturn enhancedUserType.fromStringValue( string );\n\t\t}\n\t\tthrow new UnsupportedOperationException( \"No support for parsing UserType values from String: \" + userType );\n\t}\n\n\t@Override\n\tpublic String toString(J value) {\n\t\treturn userType.returnedClass().isInstance( value )\n\t\t\t&& userType instanceof EnhancedUserType<J> enhancedUserType\n\t\t\t\t? enhancedUserType.toString( value )\n\t\t\t\t: value == null ? \"null\" : value.toString();\n\t}\n\n\t@Override\n\tpublic <X> X unwrap(J value, Class<X> type, WrapperOptions options) {\n\t\treturn unwrap( value, type, customType.getValueConverter(), options );\n\t}\n\n\tprivate <X,R> X unwrap(J value, Class<X> type, BasicValueConverter<J, R> converter, WrapperOptions options) {\n\t\tif ( value != null && !type.isInstance( value ) && converter != null ) {\n\t\t\tfinal Object relationalValue = customType.convertToRelationalValue( value );","sourceCodeStart":99,"sourceCodeEnd":135,"githubUrl":"https://github.com/hibernate/hibernate-orm/blob/fad1729dce015f908198d57a8d80274a30f905a5/hibernate-core/src/main/java/org/hibernate/type/internal/UserTypeJavaTypeWrapper.java#L99-L135","documentation":"UserTypeJavaTypeWrapper adapts a UserType to the JavaType SPI; its fromString (UserTypeJavaTypeWrapper.java:110-116) delegates only when the user type implements org.hibernate.usertype.EnhancedUserType, and otherwise throws this UnsupportedOperationException. It means some operation needs to turn a String into the custom type's value and your UserType does not expose that capability.","triggerScenarios":"An attribute mapped with @Type(MyUserType.class) is used where Hibernate parses values from strings (string-based extraction/round-trips, id or natural-id string materialization) while MyUserType implements only the plain UserType interface; the same UserType works for normal persistence but fails the first time a string round-trip is requested.","commonSituations":"Custom value types written years ago against the plain UserType contract; upgrading Hibernate to a version that starts calling fromString in a new code path; reuse of a legacy UserType for identifier or natural-id mappings.","solutions":["Implement EnhancedUserType<J> on your user type - add fromStringValue(CharSequence) and toString(J) - so the adapter can delegate (UserTypeJavaTypeWrapper.java:110-116).","If the type's column is a basic string anyway, replace the UserType with an AttributeConverter, which parses naturally.","Avoid the operation requiring string parsing for that attribute (restructure the mapping or query)."],"exampleFix":"// before - plain UserType, string parsing unsupported\npublic class PostcodeType implements UserType<Postcode> { ... }\n\n// after - EnhancedUserType supplies the missing capability\npublic class PostcodeType implements UserType<Postcode>, EnhancedUserType<Postcode> {\n    @Override public Postcode fromStringValue(CharSequence string) {\n        return Postcode.parse( string.toString() );\n    }\n    @Override public String toString(Postcode value) { return value.asText(); }\n    // ... existing UserType methods\n}","handlingStrategy":"type-guard","validationCode":"// Check capability before string round-trips of UserType-mapped values\nif ( !( userType instanceof org.hibernate.usertype.EnhancedUserType<?> ) ) {\n    // this type cannot be parsed from a String; avoid such operations\n}","typeGuard":"static boolean parsesFromString(org.hibernate.usertype.UserType<?> userType) {\n    return userType instanceof org.hibernate.usertype.EnhancedUserType<?>;\n}","tryCatchPattern":"try {\n    // path that calls JavaType.fromString for the UserType-adapted attribute\n} catch ( UnsupportedOperationException e ) {\n    if ( e.getMessage() != null && e.getMessage().contains( \"No support for parsing UserType values from String\" ) ) {\n        // implement EnhancedUserType#fromStringValue on the type, then retry\n    } else throw e;\n}","preventionTips":["Implement EnhancedUserType (fromStringValue + toString) whenever you write a UserType, even if unused today.","Keep parsing logic in fromStringValue symmetric with toString.","Prefer AttributeConverter for string-backed custom values - parsing comes for free."],"tags":["hibernate","usertype","custom-type","mapping","orm"],"backgroundTag":"custom-type-string-parsing-unsupported","analyzedSha":"fad1729dce015f908198d57a8d80274a30f905a5","analyzedAt":"2026-08-22T04:13:57.527Z","schemaVersion":2},"datasetVersion":"2026-08-22T09:17:25.309Z"}