/*
* Copyright ( c ) 2016 , 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 8079136
* @ run testng NestedSubList
* @ summary Accessing a nested sublist leads to StackOverflowError
*/
import java.util.AbstractList;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Vector;
import org.testng.annotations.Test;
import org.testng.annotations.DataProvider;
import static org.testng.Assert .fail;
public class NestedSubList {
static final int NEST_LIMIT = 65536 ;
@Test(dataProvider="lists" )
public void testAccessToSublists(List<Integer> list, boolean modifiable) {
Class <?> cls = list.getClass();
for (int i = 0 ; i < NEST_LIMIT; ++i) {
list = list.subList(0 , 1 );
}
try {
list.get(0 );
if (modifiable) {
list.remove(0 );
list.add(0 , 42 );
}
} catch (StackOverflowError e) {
fail("failed for " + cls);
}
}
@DataProvider
public static Object[][] lists() {
final boolean MODIFIABLE = true ;
final boolean NON_MODIFIABLE = false ;
List<Integer> c = Arrays.asList(42 );
return new Object[][] {
{c, NON_MODIFIABLE},
{new ArrayList<>(c), MODIFIABLE},
{new LinkedList<>(c), MODIFIABLE},
{new MyList(), NON_MODIFIABLE},
{new Vector<>(c), MODIFIABLE},
{Collections.singletonList(42 ), NON_MODIFIABLE},
{Collections.checkedList(c, Integer.class ), NON_MODIFIABLE},
{Collections.checkedList(new ArrayList<>(c), Integer.class ), MODIFIABLE},
{Collections.checkedList(new LinkedList<>(c), Integer.class ), MODIFIABLE},
{Collections.checkedList(new Vector<>(c), Integer.class ), MODIFIABLE},
{Collections.synchronizedList(c), NON_MODIFIABLE},
{Collections.synchronizedList(new ArrayList<>(c)), MODIFIABLE},
{Collections.synchronizedList(new LinkedList<>(c)), MODIFIABLE},
{Collections.synchronizedList(new Vector<>(c)), MODIFIABLE},
{Collections.unmodifiableList(c), NON_MODIFIABLE},
{Collections.unmodifiableList(new ArrayList<>(c)), NON_MODIFIABLE},
{Collections.unmodifiableList(new LinkedList<>(c)), NON_MODIFIABLE},
{Collections.unmodifiableList(new Vector<>(c)), NON_MODIFIABLE},
};
}
static class MyList extends AbstractList<Integer> {
public Integer get(int index) { return 42 ; }
public int size() { return 1 ; }
}
}
Messung V0.5 in Prozent C=98 H=97 G=97
¤ Dauer der Verarbeitung: 0.10 Sekunden
(vorverarbeitet am 2026-09-29)
¤
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