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/*

 * @test TestEmptyBootstrapMethodsAttr

 * @bug 8041918

 * @library /testlibrary

 * @summary Test empty bootstrap_methods table within BootstrapMethods attribute

 * @compile TestEmptyBootstrapMethodsAttr.java

 * @run main TestEmptyBootstrapMethodsAttr

 */

import java.io.File;

import com.oracle.java.testlibrary.*;

public class TestEmptyBootstrapMethodsAttr {

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

        System.out.println("Regression test for bug 8041918");

        String jarFile = System.getProperty("test.src") + File.separator + "emptynumbootstrapmethods.jar";

        // ====== extract the test case

        ProcessBuilder pb = new ProcessBuilder(new String[] { JDKToolFinder.getJDKTool("jar"), "xvf", jarFile } );

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

        output.shouldHaveExitValue(0);

        // Test case #1:

        // Try loading class with empty bootstrap_methods table where no

        // other attributes are following BootstrapMethods in attribute table.

        String className = "emptynumbootstrapmethods1";

        // ======= execute test case #1

        // Expect a lack of main method, this implies that the class loaded correctly

        // with an empty bootstrap_methods and did not generate a ClassFormatError.

        pb = ProcessTools.createJavaProcessBuilder("-cp", ".", className);

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

        output.shouldNotContain("java.lang.ClassFormatError");

        output.shouldContain("Main method not found in class " + className);

        output.shouldHaveExitValue(1);

        // Test case #2:

        // Try loading class with empty bootstrap_methods table where an

        // AnnotationDefault attribute follows the BootstrapMethods in the attribute table.

        className = "emptynumbootstrapmethods2";

        // ======= execute test case #2

        // Expect a lack of main method, this implies that the class loaded correctly

        // with an empty bootstrap_methods and did not generate ClassFormatError.

        pb = ProcessTools.createJavaProcessBuilder("-cp", ".", className);

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

        output.shouldNotContain("java.lang.ClassFormatError");

        output.shouldContain("Main method not found in class " + className);

        output.shouldHaveExitValue(1);

    }

}