>
> Can someone tell me why the primary key class must
> implement hashCode() and equals() method?
The container uses these method to find if a bean instance is in its cache
or not.
Think of the cache as a hash map of PrimaryKeys to EJB instances.
>
> How should I implement them?
>
As you would implement them for any value object:
class PrimaryKey {
Type1 field1;
Type2 field2;
boolean equals(Object other) {
if (other == null || !(other instanceof PrimaryKey)) return false;
PrimaryKey o = (PrimaryKey)other;
return (field1 == o.field1 || field1 != null &&
field1.equals(o.field1))
&& (field2 == o.field2 || field2 != null &&
field2.equals(o.field2))
}
int hashCode() {
int ret = 0;
if (field1 != null) ret += field1.hashCode();
if (field2 != null) ret += field2.hashCode() * 127;
return ret;
}
}
- Avi
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