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/*

 * @test Test2GbHeap

 * @bug 8031686

 * @summary Regression test to ensure we can start G1 with 2gb heap.

 * @key gc

 * @key regression

 * @library /testlibrary

 * @modules java.base/sun.misc

 *          java.management

 */

import java.util.ArrayList;

import jdk.test.lib.OutputAnalyzer;

import jdk.test.lib.ProcessTools;

public class Test2GbHeap {

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

    ArrayList<String> testArguments = new ArrayList<String>();

    testArguments.add("-XX:+UseG1GC");

    testArguments.add("-Xmx2g");

    testArguments.add("-version");

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(testArguments.toArray(new String[0]));

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

    // Avoid failing test for setups not supported.

    if (output.getOutput().contains("Could not reserve enough space for 2097152KB object heap")) {

      // Will fail on machines with too little memory (and Windows 32-bit VM), ignore such failures.

      output.shouldHaveExitValue(1);

      // G1 is not supported on embedded, ignore such failures.

      output.shouldHaveExitValue(1);

    } else {

      // Normally everything should be fine.

      output.shouldHaveExitValue(0);

    }

  }

}