no need to check for null because calling instanceof, because "null instanceof <class> ==> false"

h2/src/main/org/h2/message/DbException.java

@@ -307,7 +307,7 @@ public class DbException extends RuntimeException {
     public static DbException convertIOException(IOException e, String message) {
         if (message == null) {
             Throwable t = e.getCause();
-            if (t != null && t instanceof DbException) {
+            if (t instanceof DbException) {
                 return (DbException) t;
             }
             return get(ErrorCode.IO_EXCEPTION_1, e, e.toString());

h2/src/main/org/h2/upgrade/DbUpgrade.java

@@ -52,7 +52,7 @@ public class DbUpgrade {
         i2.putAll(info);
         // clone so that the password (if set as a char array) is not cleared
         Object o = info.get("password");
-        if (o != null && o instanceof char[]) {
+        if (o instanceof char[]) {
             i2.put("password", StringUtils.cloneCharArray((char[]) o));
         }
         info = i2;