8312093: Incorrect javadoc comment text

Reviewed-by: jlaskey, iris
Backport-of: 1c9691b1f762812aa090b88507d60a2e2e5f4933

Author: lahodaj

src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavaTokenizer.java

@@ -1546,7 +1546,10 @@ protected void scanDocComment() {
                     return;
                 }
 
-                skip('*');
+                if (skip('*') != 0 && is('/')) {
+                    return ;
+                }
+
                 skipWhitespace();
 
                 if (isEOLN()) {

test/langtools/tools/javac/parser/JavacParserTest.java

@@ -23,7 +23,7 @@
 
 /*
  * @test
- * @bug 7073631 7159445 7156633 8028235 8065753 8205418 8205913 8228451 8237041 8253584 8246774 8256411 8256149 8259050 8266436 8267221 8271928 8275097 8293897 8295401 8304671
+ * @bug 7073631 7159445 7156633 8028235 8065753 8205418 8205913 8228451 8237041 8253584 8246774 8256411 8256149 8259050 8266436 8267221 8271928 8275097 8293897 8295401 8304671 8312093
  * @summary tests error and diagnostics positions
  * @author  Jan Lahoda
  * @modules jdk.compiler/com.sun.tools.javac.api
@@ -2395,6 +2395,34 @@ public Void visitCase(CaseTree node, Void p) {
                 codes);
     }
 
+    @Test //JDK-8312093
+    void testJavadoc() throws IOException {
+        String code = """
+                      public class Test {
+                          /***/
+                          void main() {
+                          }
+                      }
+                      """;
+        DiagnosticCollector<JavaFileObject> coll =
+                new DiagnosticCollector<>();
+        JavacTaskImpl ct = (JavacTaskImpl) tool.getTask(null, fm, coll, null,
+                null, Arrays.asList(new MyFileObject(code)));
+        Trees trees = Trees.instance(ct);
+        CompilationUnitTree cut = ct.parse().iterator().next();
+        new TreePathScanner<Void, Void>() {
+            @Override
+            public Void visitMethod(MethodTree node, Void p) {
+                if (!node.getName().contentEquals("main")) {
+                    return null;
+                }
+                String comment = trees.getDocComment(getCurrentPath());
+                assertEquals("Expecting empty comment", "", comment);
+                return null;
+            }
+        }.scan(cut, null);
+    }
+
     void run(String[] args) throws Exception {
         int passed = 0, failed = 0;
         final Pattern p = (args != null && args.length > 0)