1 files changed, 8 insertions, 1 deletions
diff --git a/cpp/src/Slice/JavaUtil.cpp b/cpp/src/Slice/JavaUtil.cpp
index 9ad435fbae7..b2ad3602631 100644
--- a/cpp/src/Slice/JavaUtil.cpp
+++ b/cpp/src/Slice/JavaUtil.cpp
@@ -754,7 +754,14 @@ Slice::JavaOutput::openClass(const string& cls, const string& prefix, const stri
                 continue;
             }
 
-            if(IceUtilInternal::mkdir(path, 0777) != 0)
+            int err = IceUtilInternal::mkdir(path, 0777);
+            // If slice2java is run concurrently, it's possible that another instance of slice2java has already
+            // created the directory.
+            if (err == 0 || (errno == EEXIST && IceUtilInternal::directoryExists(path)))
+            {
+                // Directory successfully created or already exists.
+            }
+            else
             {
                 ostringstream os;
                 os << "cannot create directory `" << path << "': " << IceUtilInternal::errorToString(errno);