Java example source code file (EmptyFinallyTest.java)

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Java - Java tags/keywords

assertionerror, emptyfinally, emptyfinallytest, exception, printwriter, string, stringwriter

The EmptyFinallyTest.java Java example source code

import java.io.PrintWriter;
import java.io.StringWriter;
import java.nio.file.Paths;

/*
 * Copyright (c) 2013, 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 6181889
 * @summary Empty try/finally results in bytecodes being generated
 */

public class EmptyFinallyTest {
    private static final String assertionErrorMsg =
            "No \"Exception table\" should be generated in this case";

    public static void main(String[] args) {
        new EmptyFinallyTest().run();
    }

    void run() {
        check("-c", Paths.get(System.getProperty("test.classes"),
                "EmptyFinally.class").toString());
    }

    void check(String... params) {
        StringWriter s;
        String out;
        try (PrintWriter pw = new PrintWriter(s = new StringWriter())) {
            com.sun.tools.javap.Main.run(params, pw);
            out = s.toString();
        }
        if (out.contains("Exception table")) {
            throw new AssertionError(assertionErrorMsg);
        }
    }
}

class EmptyFinally {
    void m() {
        try {
            System.out.println("EMPTY TRY!");
        } finally {}
    }
}