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  23 
  24 /*
  25  * @test TestEmptyBootstrapMethodsAttr
  26  * @bug 8041918
  27  * @library /testlibrary
  28  * @summary Test empty bootstrap_methods table within BootstrapMethods attribute
  29  * @modules java.base/sun.misc
  30  *          java.management
  31  * @compile TestEmptyBootstrapMethodsAttr.java
  32  * @run main TestEmptyBootstrapMethodsAttr
  33  */
  34 
  35 import java.io.File;
  36 import jdk.test.lib.*;
  37 
  38 public class TestEmptyBootstrapMethodsAttr {
  39 
  40     public static void main(String args[]) throws Throwable {
  41         System.out.println("Regression test for bug 8041918");
  42         String jarFile = System.getProperty("test.src") + File.separator + "emptynumbootstrapmethods.jar";
  43 
  44         // ====== extract the test case
  45         ProcessBuilder pb = new ProcessBuilder(new String[] { JDKToolFinder.getJDKTool("jar"), "xvf", jarFile } );
  46         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  47         output.shouldHaveExitValue(0);
  48 
  49         // Test case #1:
  50         // Try loading class with empty bootstrap_methods table where no
  51         // other attributes are following BootstrapMethods in attribute table.
  52         String className = "emptynumbootstrapmethods1";
  53 
  54         // ======= execute test case #1
  55         // Expect a lack of main method, this implies that the class loaded correctly
  56         // with an empty bootstrap_methods and did not generate a ClassFormatError.
  57         pb = ProcessTools.createJavaProcessBuilder("-cp", ".", className);
  58         output = new OutputAnalyzer(pb.start());
  59         output.shouldNotContain("java.lang.ClassFormatError");
  60         output.shouldContain("Main method not found in class " + className);
  61         output.shouldHaveExitValue(1);
  62 
  63         // Test case #2:
  64         // Try loading class with empty bootstrap_methods table where an
  65         // AnnotationDefault attribute follows the BootstrapMethods in the attribute table.
  66         className = "emptynumbootstrapmethods2";
  67 
  68         // ======= execute test case #2
  69         // Expect a lack of main method, this implies that the class loaded correctly
  70         // with an empty bootstrap_methods and did not generate ClassFormatError.
  71         pb = ProcessTools.createJavaProcessBuilder("-cp", ".", className);
  72         output = new OutputAnalyzer(pb.start());
  73         output.shouldNotContain("java.lang.ClassFormatError");
  74         output.shouldContain("Main method not found in class " + className);
  75         output.shouldHaveExitValue(1);
  76     }
  77 }