Merge HADOOP-10248. Property name should be included in the exception where property value is null. Contributed by Akira AJISAKA.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1560907 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -260,6 +260,9 @@ Release 2.3.0 - UNRELEASED
     HADOOP-10132. RPC#stopProxy() should log the class of proxy when IllegalArgumentException 
     is encountered (Ted yu via umamahesh)
 
+    HADOOP-10248. Property name should be included in the exception where property value 
+    is null (Akira AJISAKA via umamahesh)
+
   OPTIMIZATIONS
 
     HADOOP-10142. Avoid groups lookup for unprivileged users such as "dr.who"

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/Configuration.java

@@ -957,7 +957,7 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
         "Property name must not be null");
     Preconditions.checkArgument(
         value != null,
-        "Property value must not be null");
+        "The value of property " + name + " must not be null");
     DeprecationContext deprecations = deprecationContext.get();
     if (deprecations.getDeprecatedKeyMap().isEmpty()) {
       getProps();

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/conf/TestConfiguration.java

@@ -1162,6 +1162,8 @@ public class TestConfiguration extends TestCase {
       fail("Should throw an IllegalArgumentException exception ");
     } catch (Exception e) {
       assertTrue(e instanceof IllegalArgumentException);
+      assertEquals(e.getMessage(),
+          "The value of property testClassName must not be null");
     }
   }
 
@@ -1172,6 +1174,7 @@ public class TestConfiguration extends TestCase {
       fail("Should throw an IllegalArgumentException exception ");
     } catch (Exception e) {
       assertTrue(e instanceof IllegalArgumentException);
+      assertEquals(e.getMessage(), "Property name must not be null");
     }
   }