Bugzilla 40847: possible NPE in Jar.java

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@474481 13f79535-47bb-0310-9956-ffa450edef68

CONTRIBUTORS

@@ -6,6 +6,7 @@ Alexey Solofnenko
 Andreas Ames
 Andreas Mross
 Andrew Everitt
+Andrey Urazov
 Anil K. Vijendran
 Anli Shundi
 Anthony Goubard

WHATSNEW

@@ -17,6 +17,9 @@ Fixed bugs:
   take comparison with another CompressedResouce into account.
   Bugzilla 40949.
 
+* possible NPE in Jar.java.
+  Bugzilla 40847
+
 Other changes:
 --------------
 

contributors.xml

@@ -34,6 +34,10 @@
     <first>Andrew</first>
     <last>Everitt</last>
   </name>
+  <name>
+    <first>Andrey</first>
+    <last>Urazov</last>
+  </name>
   <name>
     <first>Anil</first>
     <middle>K.</middle>

src/main/org/apache/tools/ant/taskdefs/Jar.java

@@ -526,7 +526,7 @@ public class Jar extends Zip {
             Manifest.Attribute classpath =
                 mf.getMainSection().getAttribute(Manifest.ATTRIBUTE_CLASSPATH);
             String[] cpEntries = null;
-            if (classpath != null) {
+            if (classpath != null && classpath.getValue() != null) {
                 StringTokenizer tok = new StringTokenizer(classpath.getValue(),
                                                           " ");
                 cpEntries = new String[tok.countTokens()];