8308872: enhance logging and some exception in krb5/Config.java

Reviewed-by: weijun

Author: MBaesken

src/java.security.jgss/share/classes/sun/security/krb5/Config.java

@@ -671,6 +671,9 @@ private static Void readConfigFileLines(
     private List<String> loadConfigFile(final String fileName)
             throws IOException, KrbException {
 
+        if (DEBUG) {
+            System.out.println("Loading config file from " + fileName);
+        }
         List<String> result = new ArrayList<>();
         List<String> raw = new ArrayList<>();
         Set<Path> dupsCheck = new HashSet<>();
@@ -781,6 +784,9 @@ private Hashtable<String,Object> parseStanzaTable(List<String> v)
             throws KrbException {
         Hashtable<String,Object> current = stanzaTable;
         for (String line: v) {
+            if (DEBUG) {
+                System.out.println(line);
+            }
             // There are only 3 kinds of lines
             // 1. a = b
             // 2. a = {
@@ -979,16 +985,22 @@ public int[] defaultEtype(String configName) throws KrbException {
         String default_enctypes;
         default_enctypes = get("libdefaults", configName);
         if (default_enctypes == null && !configName.equals("permitted_enctypes")) {
+            if (DEBUG) {
+                System.out.println("Getting permitted_enctypes from libdefaults");
+            }
             default_enctypes = get("libdefaults", "permitted_enctypes");
         }
         int[] etype;
         if (default_enctypes == null) {
             if (DEBUG) {
-                System.out.println("Using builtin default etypes for " +
+                System.out.println("default_enctypes were null, using builtin default etypes for configuration " +
                     configName);
             }
             etype = EType.getBuiltInDefaults();
         } else {
+            if (DEBUG) {
+                System.out.println("default_enctypes:" + default_enctypes);
+            }
             String delim = " ";
             StringTokenizer st;
             for (int j = 0; j < default_enctypes.length(); j++) {
@@ -1010,7 +1022,8 @@ public int[] defaultEtype(String configName) throws KrbException {
                 }
             }
             if (ls.isEmpty()) {
-                throw new KrbException("no supported default etypes for "
+                throw new KrbException("out of " + len +
+                        " default etypes no supported etypes found for configuration "
                         + configName);
             } else {
                 etype = new int[ls.size()];