diff --git a/src/main/org/apache/tools/ant/types/resources/ArchiveResource.java b/src/main/org/apache/tools/ant/types/resources/ArchiveResource.java
index 8329a1969..2f1bb38cf 100644
--- a/src/main/org/apache/tools/ant/types/resources/ArchiveResource.java
+++ b/src/main/org/apache/tools/ant/types/resources/ArchiveResource.java
@@ -242,7 +242,7 @@ public abstract class ArchiveResource extends Resource {
             : getArchive().toString() + ':' + getName();
     }
 
-    private synchronized void checkEntry() throws BuildException {
+    protected final synchronized void checkEntry() throws BuildException {
         dieOnCircularReference();
         if (haveEntry) {
             return;
diff --git a/src/main/org/apache/tools/ant/types/resources/TarResource.java b/src/main/org/apache/tools/ant/types/resources/TarResource.java
index f840bf7f1..ae618da8c 100644
--- a/src/main/org/apache/tools/ant/types/resources/TarResource.java
+++ b/src/main/org/apache/tools/ant/types/resources/TarResource.java
@@ -115,6 +115,7 @@ public class TarResource extends ArchiveResource {
         if (isReference()) {
             return ((TarResource) getCheckedRef()).getUserName();
         }
+        checkEntry();
         return userName;
     }
 
@@ -125,6 +126,7 @@ public class TarResource extends ArchiveResource {
         if (isReference()) {
             return ((TarResource) getCheckedRef()).getGroup();
         }
+        checkEntry();
         return groupName;
     }
 
@@ -135,6 +137,7 @@ public class TarResource extends ArchiveResource {
         if (isReference()) {
             return ((TarResource) getCheckedRef()).getUid();
         }
+        checkEntry();
         return uid;
     }
 
@@ -145,6 +148,7 @@ public class TarResource extends ArchiveResource {
         if (isReference()) {
             return ((TarResource) getCheckedRef()).getGid();
         }
+        checkEntry();
         return uid;
     }
 
diff --git a/src/main/org/apache/tools/ant/types/resources/ZipResource.java b/src/main/org/apache/tools/ant/types/resources/ZipResource.java
index fc196f878..29c911f8f 100644
--- a/src/main/org/apache/tools/ant/types/resources/ZipResource.java
+++ b/src/main/org/apache/tools/ant/types/resources/ZipResource.java
@@ -173,6 +173,10 @@ public class ZipResource extends ArchiveResource {
      * @since Ant 1.8.0
      */
     public ZipExtraField[] getExtraFields() {
+        if (isReference()) {
+            return ((ZipResource) getCheckedRef()).getExtraFields();
+        }
+        checkEntry();
         if (extras == null) {
             return new ZipExtraField[0];
         }