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8379830: The warnings for value-based classes need updating to include use of the Reference API #32055

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8379830: The warnings for value-based classes need updating to include use of the Reference API #32055

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a340a67
Add vbc warning for Reference
liach Jul 27, 2026
6422ae6
"referent"
liach Jul 27, 2026
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6 changes: 5 additions & 1 deletion src/java.base/share/classes/java/lang/doc-files/ValueBased.html
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
<!doctype html>
<!--
Copyright (c) 2013, 2024, Oracle and/or its affiliates. All rights reserved.
Copyright (c) 2013, 2026, Oracle and/or its affiliates. All rights reserved.
DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

This code is free software; you can redistribute it and/or modify it
Expand Down Expand Up @@ -65,6 +65,10 @@ <h1 id="ValueBased">{@index "Value-based Classes"}</h1>
because the programmer cannot guarantee exclusive ownership of the
associated monitor.</p>

<p>Use of instances of value-based classes as referents in {@linkplain
java.lang.ref.Reference reference objects} is strongly discouraged,
because these instances do not have reliable identity.</p>

<p>Identity-related behavior of value-based classes may change in a future release.
For example, synchronization may fail.</p>
Comment on lines 72 to 73

@dholmes-ora dholmes-ora Jul 27, 2026

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I would have expanded this part as well:

For example, synchronization may fail, or use as a referent object may throw an exception.

but it isn't critical.


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