1 /*
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  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 /test/lib
  28  * @summary Test empty bootstrap_methods table within BootstrapMethods attribute
  29  * @modules java.base/jdk.internal.misc
  30  *          java.management
  31  * @compile TestEmptyBootstrapMethodsAttr.java
  32  * @run main TestEmptyBootstrapMethodsAttr
  33  */
  34 
  35 import java.io.File;
  36 import jdk.test.lib.process.ProcessTools;
  37 import jdk.test.lib.process.OutputAnalyzer;
  38 import jdk.test.lib.JDKToolFinder;
  39 
  40 public class TestEmptyBootstrapMethodsAttr {
  41 
  42     public static void main(String args[]) throws Throwable {
  43         System.out.println("Regression test for bug 8041918");
  44         String jarFile = System.getProperty("test.src") + File.separator + "emptynumbootstrapmethods.jar";
  45 
  46         // ====== extract the test case
  47         ProcessBuilder pb = new ProcessBuilder(new String[] { JDKToolFinder.getJDKTool("jar"), "xvf", jarFile } );
  48         OutputAnalyzer output = new OutputAnalyzer(pb.start());
  49         output.shouldHaveExitValue(0);
  50 
  51         // Test case #1:
  52         // Try loading class with empty bootstrap_methods table where no
  53         // other attributes are following BootstrapMethods in attribute table.
  54         String className = "emptynumbootstrapmethods1";
  55 
  56         // ======= execute test case #1
  57         // Expect a lack of main method, this implies that the class loaded correctly
  58         // with an empty bootstrap_methods and did not generate a ClassFormatError.
  59         pb = ProcessTools.createJavaProcessBuilder("-cp", ".", className);
  60         output = new OutputAnalyzer(pb.start());
  61         output.shouldNotContain("java.lang.ClassFormatError");
  62         output.shouldContain("Main method not found in class " + className);
  63         output.shouldHaveExitValue(1);
  64 
  65         // Test case #2:
  66         // Try loading class with empty bootstrap_methods table where an
  67         // AnnotationDefault attribute follows the BootstrapMethods in the attribute table.
  68         className = "emptynumbootstrapmethods2";
  69 
  70         // ======= execute test case #2
  71         // Expect a lack of main method, this implies that the class loaded correctly
  72         // with an empty bootstrap_methods and did not generate ClassFormatError.
  73         pb = ProcessTools.createJavaProcessBuilder("-cp", ".", className);
  74         output = new OutputAnalyzer(pb.start());
  75         output.shouldNotContain("java.lang.ClassFormatError");
  76         output.shouldContain("Main method not found in class " + className);
  77         output.shouldHaveExitValue(1);
  78     }
  79 }