52 lines
1.8 KiB
Java
52 lines
1.8 KiB
Java
/*
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package optionsvalidation;
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import java.lang.ref.WeakReference;
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class JVMStartup {
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private static volatile WeakReference<Object> weakRef;
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private static synchronized void createWeakRef() {
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Object o = new Object();
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weakRef = new WeakReference<>(o);
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}
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/* Simple method to test that java start-up. Used for testing options. */
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public static void main(String[] args) throws Exception {
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byte[] garbage = new byte[8192];
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int i = 0;
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createWeakRef();
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do {
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garbage = new byte[8192];
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i++;
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/* Initiate GC after 5 iterations */
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if (i > 5) {
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System.gc();
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}
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} while(weakRef.get() != null);
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System.out.println("Java start-up!");
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}
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}
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