Index: src/build/PrepareToDeployAction.java
===================================================================
--- src/build/PrepareToDeployAction.java        (revision 3857)
+++ src/build/PrepareToDeployAction.java        (working copy)
@@ -149,17 +149,27 @@
           }
         });
         Set<String> names = new HashSet<String>();
+        IOException lastException = null;
         for (Library library : libs) {
           final VirtualFile[] files = library.getFiles(OrderRootType.CLASSES);
           for (VirtualFile virtualFile : files) {
-            if (virtualFile.getFileSystem() instanceof JarFileSystem) {
-              addLibraryJar(virtualFile, zipFile, name, zos, progressIndicator);
+            try {
+              if (virtualFile.getFileSystem() instanceof JarFileSystem) {
+                addLibraryJar(virtualFile, zipFile, name, zos, progressIndicator);
+              }
+              else {
+                makeAndAddLibraryJar(virtualFile, zos, zipFile, name, library, names, progressIndicator);
+              }
+            } catch (IOException e) {
+              lastException = e;
             }
-            else {
-              makeAndAddLibraryJar(virtualFile, zos, zipFile, name, library, names, progressIndicator);
-            }
           }
         }
+        // we want to try the best we can to build the jar, before throwing an
+        // exception
+        if (lastException != null)  {
+          throw lastException;
+        }
       }
       finally {
         if (zos != null) zos.close();