Scott Murphy Heiberg created GROOVY-12677:
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Summary: A memoize() closure that has cached a null result cannot
be serialized
Key: GROOVY-12677
URL: https://issues.apache.org/jira/browse/GROOVY-12677
Project: Groovy
Issue Type: Bug
Affects Versions: 5.0.8, 4.0.33, 6.0.0, 7.0.0-alpha-1
Reporter: Scott Murphy Heiberg
{code:groovy}
def m = { x -> null }.dehydrate().memoize()
assert m(1) == null
def bytes = new ByteArrayOutputStream()
bytes.withObjectOutputStream { it.writeObject(m) } // fails here
def copy = new
ByteArrayInputStream(bytes.toByteArray()).withObjectInputStream(getClass().classLoader)
{ it.readObject() }
assert copy(1) == null
{code}
*Actual:* {{java.io.NotSerializableException:
org.codehaus.groovy.runtime.memoize.Memoize$MemoizeNullValue}}. The same
closure serializes when its cached results are not null.
*Expected:* the memoized closure serializes. The copy returns null for the
cached arguments without calling the wrapped closure again.
The memoizing closure stores a null result as a private place-holder,
{{Memoize.MemoizeNullValue}}, which is not {{Serializable}}. The closure
recognises the place-holder by identity, so a deserialized copy must also
resolve back to the shared instance.
Verified on 4.0.33, 5.0.8, 6.0.0 and master.
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