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8361214: An anonymous class is erroneously being classify as an abstract class

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Reviewed-by: liach, mcimadamore
This commit is contained in:
Vicente Romero 2025-07-07 14:56:53 +00:00
parent fea73c1d40
commit 05c9eec8d0
2 changed files with 45 additions and 1 deletions
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2
src/jdk.compiler/share/classes/com/sun/tools/javac/comp/Attr.java
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@ -2833,7 +2833,7 @@ public class Attr extends JCTree.Visitor {
resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
boolean skipNonDiamondPath = false;
// Check that class is not abstract
if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
if (cdef == null && !tree.classDeclRemoved() && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
(clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
log.error(tree.pos(),
Errors.AbstractCantBeInstantiated(clazztype.tsym));

44
test/langtools/tools/javac/generics/diamond/AnonymousLabeledAsAbstractTest.java Normal file
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@ -0,0 +1,44 @@
/*
* Copyright (c) 2025, 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
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8361214
* @summary An anonymous class is erroneously being classify as an abstract class
* @compile AnonymousLabeledAsAbstractTest.java
*/
class AnonymousLabeledAsAbstractTest {
abstract class Base<T> {}
abstract class Derived1<T> extends Base<T> {}
abstract class Derived2<T> extends Base<T> {
Derived2(Derived1<T> obj){}
}
abstract class Derived3<T> extends Base<T> {
Derived3(Derived2<T> obj){}
}
Base<String> obj = new Derived2<>(new Derived1<>(){}){};
Base<String> obj2 = new Derived3<String>(new Derived2<>(new Derived1<>(){}){}){};
Base<String> obj3 = new Derived3<>(new Derived2<>(new Derived1<>(){}){}){};
}