GG-19426 Don't use "IgniteVersionUtils.BUILD_TSTAMP_DATE_FORMATTER" concurrently.

Author: ibessonov

modules/core/src/main/java/org/apache/ignite/internal/IgniteVersionUtils.java

@@ -32,7 +32,7 @@ public class IgniteVersionUtils {
     public static final IgniteProductVersion VER;
 
     /** UTC build date formatter. */
-    public static final SimpleDateFormat BUILD_TSTAMP_DATE_FORMATTER;
+    private static final SimpleDateFormat BUILD_TSTAMP_DATE_FORMATTER;
 
     /** Formatted build date. */
     public static final String BUILD_TSTAMP_STR;
@@ -74,7 +74,7 @@ public class IgniteVersionUtils {
 
         BUILD_TSTAMP_DATE_FORMATTER.setTimeZone(TimeZone.getTimeZone("UTC"));
 
-        BUILD_TSTAMP_STR = BUILD_TSTAMP_DATE_FORMATTER.format(new Date(BUILD_TSTAMP * 1000));
+        BUILD_TSTAMP_STR = formatBuildTimeStamp(BUILD_TSTAMP * 1000);
 
         COPYRIGHT = BUILD_TSTAMP_STR.substring(0, 4) + " Copyright(C) Apache Software Foundation";
 
@@ -89,6 +89,17 @@ public class IgniteVersionUtils {
         VER = IgniteProductVersion.fromString(VER_STR + '-' + BUILD_TSTAMP + '-' + REV_HASH_STR);
     }
 
+    /**
+     * Builds string date representation in "yyyyMMdd" format.
+     * "synchronized" because it uses {@link SimpleDateFormat} which is not threadsafe.
+     *
+     * @param ts Timestamp.
+     * @return Timestamp date in UTC timezone.
+     */
+    public static synchronized String formatBuildTimeStamp(long ts) {
+        return BUILD_TSTAMP_DATE_FORMATTER.format(new Date(ts));
+    }
+
     /**
      * Private constructor.
      */

modules/core/src/main/java/org/apache/ignite/lang/IgniteProductVersion.java

@@ -258,7 +258,7 @@ public int compareToIgnoreTimestamp(@NotNull IgniteProductVersion o) {
 
     /** {@inheritDoc} */
     @Override public String toString() {
-        String revTsStr = IgniteVersionUtils.BUILD_TSTAMP_DATE_FORMATTER.format(new Date(revTs * 1000));
+        String revTsStr = IgniteVersionUtils.formatBuildTimeStamp(revTs * 1000);
 
         String hash = U.byteArray2HexString(revHash).toLowerCase();