Test2GbHeap.java

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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
 */

import java.util.ArrayList;

import com.oracle.java.testlibrary.OutputAnalyzer;
import com.oracle.java.testlibrary.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);
    } else if (output.getOutput().contains("G1 GC is disabled in this release")) {
      // G1 is not supported on embedded, ignore such failures.
      output.shouldHaveExitValue(1);
    } else {
      // Normally everything should be fine.
      output.shouldHaveExitValue(0);
    }
  }
}