Fix LANG-1771: Handle malformed input '[String' in getShortCanonicalName

Author: abhisripathi

src/main/java/org/apache/commons/lang3/ClassUtils.java

@@ -496,9 +496,14 @@ private static String getCanonicalName(final String name) {
         className = className.substring(dim);
         if (className.startsWith("L")) {
             className = className.substring(1, className.endsWith(";") ? className.length() - 1 : className.length());
-        } else if (!className.isEmpty()) {
-            className = reverseAbbreviationMap.get(className.substring(0, 1));
+        } 
+//        else if (!className.isEmpty()) {
+//            className = reverseAbbreviationMap.get(className.substring(0, 1));
+//        }
+        else if (!className.isEmpty() && className.length() == 1 && reverseAbbreviationMap.containsKey(className)) {
+            className = reverseAbbreviationMap.get(className);
         }
+
         final StringBuilder canonicalClassNameBuffer = new StringBuilder(className.length() + dim * 2);
         canonicalClassNameBuffer.append(className);
         for (int i = 0; i < dim; i++) {

src/test/java/org/apache/commons/lang3/ClassUtilsTest.java

@@ -237,6 +237,14 @@ public void test_getAllSuperclasses_Class() {
         assertNull(ClassUtils.getAllSuperclasses(null));
     }
 
+    @Test
+    public void test_getShortCanonicalName_MalformedInput() {
+        String input = "[String";
+        String expected = "String[]";
+        String actual = ClassUtils.getShortCanonicalName(input);
+        assertEquals(expected, actual);
+    }
+
     @Test
     public void test_getCanonicalName_Class() {
         assertEquals("org.apache.commons.lang3.ClassUtils", ClassUtils.getCanonicalName(ClassUtils.class));