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  23 
  24 /*
  25  * @test TestEmptyBootstrapMethodsAttr
  26  * @bug 8041918
  27  * @library /test/lib
  28  * @summary Test empty bootstrap_methods table within BootstrapMethods attribute
  29  * @modules java.base/jdk.internal.misc
  30  *          java.management
  31  * @compile emptynumbootstrapmethods1.jcod emptynumbootstrapmethods2.jcod
  32  * @run driver TestEmptyBootstrapMethodsAttr
  33  */
  34 
  35 import java.io.File;
  36 import jdk.test.lib.process.ProcessTools;
  37 import jdk.test.lib.process.OutputAnalyzer;
  38 
  39 public class TestEmptyBootstrapMethodsAttr {
  40 
  41     public static void main(String args[]) throws Throwable {
  42         System.out.println("Regression test for bug 8041918");
  43 
  44         // Test case #1:
  45         // Try loading class with empty bootstrap_methods table where no
  46         // other attributes are following BootstrapMethods in attribute table.
  47         String className = "emptynumbootstrapmethods1";
  48 
  49         // ======= execute test case #1
  50         // Expect a lack of main method, this implies that the class loaded correctly
  51         // with an empty bootstrap_methods and did not generate a ClassFormatError.
  52         ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(className);
  53         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  54         output.shouldNotContain("java.lang.ClassFormatError");
  55         output.shouldContain("Main method not found in class " + className);
  56         output.shouldHaveExitValue(1);
  57 
  58         // Test case #2:
  59         // Try loading class with empty bootstrap_methods table where an
  60         // AnnotationDefault attribute follows the BootstrapMethods in the attribute table.
  61         className = "emptynumbootstrapmethods2";
  62 
  63         // ======= execute test case #2
  64         // Expect a lack of main method, this implies that the class loaded correctly
  65         // with an empty bootstrap_methods and did not generate ClassFormatError.
  66         pb = ProcessTools.createJavaProcessBuilder(className);
  67         output = new OutputAnalyzer(pb.start());
  68         output.shouldNotContain("java.lang.ClassFormatError");
  69         output.shouldContain("Main method not found in class " + className);
  70         output.shouldHaveExitValue(1);
  71     }
  72 }