Umple W045 Initialized Value in Key
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W045 Initialized Value in Key
Umple semantic warning reported when an attribute in the key is given an initial value
If an attribute is given an initial value and is part of a key, then there is potential for keys of all instances of a class to be the same, meaning that they would be treated as equal and would have the same hash value. It is unlikely that a developer intends for this to be the case, so a warning is thrown to inform them of this behaviour.
Example
// This example generates the message
class X {
Integer z = 1;
key { z }
}
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Solution to The Above So the Message No Longer Appears
// The following shows how to avoid the message
class X {
Integer z;
key { z }
}
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