1 /*
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  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
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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  * @compile TestEmptyBootstrapMethodsAttr.java
  30  * @run main TestEmptyBootstrapMethodsAttr
  31  */
  32 
  33 import java.io.File;
  34 import com.oracle.java.testlibrary.*;
  35 
  36 public class TestEmptyBootstrapMethodsAttr {
  37 
  38     public static void main(String args[]) throws Throwable {
  39         System.out.println("Regression test for bug 8041918");
  40         String jarFile = System.getProperty("test.src") + File.separator + "emptynumbootstrapmethods.jar";
  41 
  42         // ====== extract the test case
  43         ProcessBuilder pb = new ProcessBuilder(new String[] { JDKToolFinder.getJDKTool("jar"), "xvf", jarFile } );
  44         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  45         output.shouldHaveExitValue(0);
  46 
  47         // Test case #1:
  48         // Try loading class with empty bootstrap_methods table where no
  49         // other attributes are following BootstrapMethods in attribute table.
  50         String className = "emptynumbootstrapmethods1";
  51 
  52         // ======= execute test case #1 
  53         // Expect a lack of main method, this implies that the class loaded correctly
  54         // with an empty bootstrap_methods and did not generate a ClassFormatError.
  55         pb = ProcessTools.createJavaProcessBuilder("-cp", ".", className);
  56         output = new OutputAnalyzer(pb.start());
  57         output.shouldNotContain("java.lang.ClassFormatError: Invalid BootstrapMethods attribute length 2 in class");
  58         output.shouldContain("Main method not found in class " + className);
  59         output.shouldHaveExitValue(1);
  60 
  61         // Test case #2:
  62         // Try loading class with empty bootstrap_methods table where an
  63         // AnnotationDefault attribute follows the BootstrapMethods in the attribute table.
  64         className = "emptynumbootstrapmethods2";
  65 
  66         // ======= execute test case #2
  67         // Expect a lack of main method, this implies that the class loaded correctly
  68         // with an empty bootstrap_methods and did not generate ClassFormatError.
  69         pb = ProcessTools.createJavaProcessBuilder("-cp", ".", className);
  70         output = new OutputAnalyzer(pb.start());
  71         output.shouldNotContain("java.lang.ClassFormatError: Invalid BootstrapMethods attribute length 2 in class");
  72         output.shouldContain("Main method not found in class " + className);
  73         output.shouldHaveExitValue(1);
  74     }
  75 }