hotspot/test/gc/g1/TestStringSymbolTableStats.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
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 *
 * 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.
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 */

/*
 * @test TestStringSymbolTableStats.java
 * @bug 8027476 8027455
 * @summary Ensure that the G1TraceStringSymbolTableScrubbing prints the expected message.
 * @key gc
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 */

import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;

public class TestStringSymbolTableStats {
  public static void main(String[] args) throws Exception {

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",
                                                              "-XX:+UnlockExperimentalVMOptions",
                                                              "-Xlog:gc+stringtable=trace",
                                                              SystemGCTest.class.getName());

    OutputAnalyzer output = new OutputAnalyzer(pb.start());

    System.out.println("Output:\n" + output.getOutput());

    output.shouldMatch("GC\\(\\d+\\) Cleaned string and symbol table");
    output.shouldHaveExitValue(0);
  }

  static class SystemGCTest {
    public static void main(String [] args) {
      System.out.println("Calling System.gc()");
      System.gc();
    }
  }
}