1 files changed, 3 insertions, 2 deletions
diff --git a/src/io/DataWriter.java b/src/io/DataWriter.java
index b4cf4d5..578c3a7 100644
--- a/src/io/DataWriter.java
+++ b/src/io/DataWriter.java
@@ -70,10 +70,11 @@ public class DataWriter implements ResultListener, Closeable {
      */
     public void open() throws IOException {
         try {
-            m_profile.open();
-            m_tweet.open();
             readIds(m_profileIdSet, m_profile);
             readIds(m_tweetIdSet, m_tweet);
+            // open after reading input to prevent simultaneous r/w access
+            m_profile.open();
+            m_tweet.open();
         } catch (IOException ex) {
             m_profile.close();
             m_tweet.close();