TestEmptyBootstrapMethodsAttr.java

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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);
    }
}