openjdk源码
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/*
* Copyright (c) 1999, 2011, 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 4273454 7054918 7052537
* @library ../testlibrary
* @summary Make sure getProviders(filter) doesn't throw NPE
* @run main/othervm NoInstalledProviders
*/
import java.security.*;
public class NoInstalledProviders {
public static void main(String[] args) throws Exception {
ProvidersSnapshot snapshot = ProvidersSnapshot.create();
try {
main0(args);
} finally {
snapshot.restore();
}
}
public static void main0(String[] args) throws Exception {
Provider[] provs = Security.getProviders();
// make sure there are no providers in the system
for(int i = 0; i < provs.length; i++ ) {
Security.removeProvider( provs[i].getName());
}
String filter = "Signature.SHA1withDSA";
provs = Security.getProviders(filter);
}
}