diff -r 93d0411bd67d -r 42b035e0bda9 jdk/src/java.base/share/classes/java/security/Signature.java
--- a/jdk/src/java.base/share/classes/java/security/Signature.java	Wed Dec 14 19:45:59 2016 +0530
+++ b/jdk/src/java.base/share/classes/java/security/Signature.java	Wed Dec 14 10:22:02 2016 -0500
@@ -452,6 +452,10 @@
         return this.provider;
     }
 
+    private String getProviderName() {
+        return (provider == null)  ? "(no provider)" : provider.getName();
+    }
+
     void chooseFirstProvider() {
         // empty, overridden in Delegate
     }
@@ -473,7 +477,7 @@
 
         if (!skipDebug && pdebug != null) {
             pdebug.println("Signature." + algorithm +
-                " verification algorithm from: " + this.provider.getName());
+                " verification algorithm from: " + getProviderName());
         }
     }
 
@@ -522,7 +526,7 @@
 
         if (!skipDebug && pdebug != null) {
             pdebug.println("Signature." + algorithm +
-                " verification algorithm from: " + this.provider.getName());
+                " verification algorithm from: " + getProviderName());
         }
     }
 
@@ -543,7 +547,7 @@
 
         if (!skipDebug && pdebug != null) {
             pdebug.println("Signature." + algorithm +
-                " signing algorithm from: " + this.provider.getName());
+                " signing algorithm from: " + getProviderName());
         }
     }
 
@@ -566,7 +570,7 @@
 
         if (!skipDebug && pdebug != null) {
             pdebug.println("Signature." + algorithm +
-                " signing algorithm from: " + this.provider.getName());
+                " signing algorithm from: " + getProviderName());
         }
     }