TestMultipleXlogArgs.java

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/*
 * @test TestMultipleXlogArgs
 * @summary Ensure multiple -Xlog arguments aggregate the logging options.
 * @requires vm.flagless
 * @modules java.base/jdk.internal.misc
 * @library /test/lib
 * @run driver TestMultipleXlogArgs
 */

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

public class TestMultipleXlogArgs {

    public static void main(String[] args) throws Exception {
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xlog:logging=debug",
                                                                  "-Xlog:logging=trace",
                                                                  "-Xlog:defaultmethods=trace",
                                                                  "-Xlog:defaultmethods=warning",
                                                                  "-Xlog:safepoint=info",
                                                                  "-Xlog:safepoint=info",
                                                                  "-version");
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        // -Xlog:logging=trace means that the log configuration will be printed.
        String stdoutConfigLine = "\\[logging *\\]  #0: stdout .*";
        // Ensure logging=trace has overwritten logging=debug
        output.shouldMatch(stdoutConfigLine + "logging=trace").shouldNotMatch(stdoutConfigLine + "logging=debug");
        // Make sure safepoint=info is printed exactly once even though we're setting it twice
        output.shouldMatch(stdoutConfigLine + "safepoint=info").shouldNotMatch(stdoutConfigLine + "safepoint=info.*safepoint=info");
        // Shouldn't see defaultmethods at all, because it should be covered by the initial 'all=warning' config
        output.shouldNotMatch(stdoutConfigLine + "defaultmethods");
        output.shouldHaveExitValue(0);
    }
}