Informix Error -9451

Reasons / Common Causes

-9451 fires when the database server can't instantiate the Java class mapped to a user-defined type — per the official guidance.

1. The mapping class lacking the proper access permissions for instantiation, per the official guidance — the direct, only cause (e.g. no accessible no-argument constructor).

Solutions / Resolution

1. Make sure the Java class has the proper access permissions for instantiation, per the official guidance.
2. Check the instantiation rules for the Java language, per the official guidance.

Examples

A mapping class with no public no-arg constructor

class MyUDT {
    private MyUDT(int x) { ... }   // -9451: no public no-arg constructor
}

Corrected

public class MyUDT {
    public MyUDT() { ... }
}

Diagnostic Checks

1. Check the mapping class's constructors and access modifier, and make sure a public, accessible no-argument constructor exists.

Related Errors / Related Topics

• -9443 — "Cannot find class for type (%s)." A related Java-type-mapping error, on the class being unfindable rather than uninstantiable.

The Java class mapped to a UDT couldn't be instantiated, usually a missing accessible constructor — check the class's constructors and access modifier.