Hi Ivy Devs,

Sorry to bother you, but we've run into some annoying issues with Ivy
and concurrency (using ant parallel). For some unbelievably stupid
reason SimpleDateFormat isn't thread safe.

http://download-llnw.oracle.com/javase/6/docs/api/java/text/SimpleDateFormat.html#synchronization

Please find below a patch which illustrates one possible fix. I can
imagine you might want to do something completely different, this is
more of a show of good faith. Please let me know if you need me to
raise a Bug and/or submit a different patch.

Cheers,

Charles

diff --git a/src/java/org/apache/ivy/Ivy.java b/src/java/org/apache/ivy/Ivy.java
index 3d9d8cd..608b364 100644
--- a/src/java/org/apache/ivy/Ivy.java
+++ b/src/java/org/apache/ivy/Ivy.java
@@(protected);
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Collection;
+import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
@@(protected) {

  private static final int KILO = 1024;

-   public static final SimpleDateFormat DATE_FORMAT = new
SimpleDateFormat("yyyyMMddHHmmss");
-
+   public static final ThreadSafeDateFormat DATE_FORMAT = new
ThreadSafeDateFormat("yyyyMMddHHmmss");
+
+   public static class ThreadSafeDateFormat {
+     private final String format;
+
+     public ThreadSafeDateFormat(String format) {
+        this.format = format;
+     }
+
+     public Date parse(String date) throws ParseException {
+        return new SimpleDateFormat(format).parse(date);
+     }
+
+     public String format(Date date) {
+        return new SimpleDateFormat(format).format(date);
+     }
+   }
+
  /**
   * the current version of Ivy, as displayed on the console when
   * Ivy is initialized

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