Java example source code file (LambdaBreakpointTest.java)

This example Java source code file (LambdaBreakpointTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

breakpointevent, exception, jdi, l62, l63, l65, lambdabreakpointtest, lambdabreakpointtesttarg, runnable, stopped, string, testscaffold, util

The LambdaBreakpointTest.java Java example source code

/*
 * 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.
 */

/********** LINE NUMBER SENSITIVE! *****************************************************************/

/**
 *  @test
 *  @summary Test setting breakpoints on lambda calls
 *
 *  @author Staffan Larsen
 *
 *  @run build TestScaffold VMConnection TargetListener TargetAdapter
 *  @run compile -g LambdaBreakpointTest.java
 *  @run main LambdaBreakpointTest
 */
import java.util.List;

import com.sun.jdi.LocalVariable;
import com.sun.jdi.Location;
import com.sun.jdi.Method;
import com.sun.jdi.ObjectReference;
import com.sun.jdi.ReferenceType;
import com.sun.jdi.StackFrame;
import com.sun.jdi.StringReference;
import com.sun.jdi.ThreadReference;
import com.sun.jdi.event.BreakpointEvent;
import com.sun.jdi.event.StepEvent;

 /********** target program **********/

class LambdaBreakpointTestTarg {

    static int[] breakpointLines = {
            62, 66, 63, 64, 65, 67
    };

    public static void main(String[] args) {
        test();
    }

    private static void test() {
        Runnable r = () -> {                          // B1: L62
            String from = "lambda";                   // B3: L63
            System.out.println("Hello from " + from); // B4: L64
        };                                            // B5: L65
        r.run();                                      // B2: L66
        System.out.println("Goodbye.");               // B6: L67
    }
}


 /********** test program **********/

public class LambdaBreakpointTest extends TestScaffold {

    LambdaBreakpointTest (String args[]) {
        super(args);
    }

    public static void main(String[] args)
        throws Exception
    {
        new LambdaBreakpointTest (args).startTests();
    }

    /********** test core **********/

    protected void runTests()
        throws Exception
    {
        startToMain("LambdaBreakpointTestTarg");

        // Put a breakpoint on each location in the order they should happen
        for (int line : LambdaBreakpointTestTarg.breakpointLines) {
            System.out.println("Running to line: " + line);
            BreakpointEvent be = resumeTo("LambdaBreakpointTestTarg", line);
            int stoppedAt = be.location().lineNumber();
            System.out.println("Stopped at line: " + stoppedAt);
            if (stoppedAt != line) {
                throw new Exception("Stopped on the wrong line: "
                        + stoppedAt + " != " + line);
            }
        }

        /*
         * resume the target listening for events
         */
        listenUntilVMDisconnect();
    }
}