Fix #939

release-notes/CREDITS

@@ -328,3 +328,7 @@ Sadayuki Furuhashi (frsyuki@github)
 Sergio Mira (Sergio-Mira@github)
   * Contributed #940: Add missing `hashCode()` implementations for `JsonNode` types that did not have them
    (2.6.3)
+
+Andreas Piebe (anpieber@github)
+  * Reported #939: Regression: DateConversionError in 2.6.x	
+   (2.6.3)

release-notes/VERSION

@@ -10,6 +10,8 @@ Project: jackson-databind
  (reported by scubasau@github)
 #938: Regression: `StackOverflowError` with recursive types that contain `Map.Entry`
  (reported by jloisel@github)
+#939: Regression: DateConversionError in 2.6.x 
+ (reported by Andreas P, anpieber@github)
 #940: Add missing `hashCode()` implementations for `JsonNode` types that did not have them
  (contributed by Sergio M)
 #941: Deserialization from "{}" to ObjectNode field causes "out of END_OBJECT token" error

src/main/java/com/fasterxml/jackson/databind/ObjectMapper.java

@@ -276,8 +276,7 @@ public boolean useForType(JavaType t)
             STD_VISIBILITY_CHECKER, null, TypeFactory.defaultInstance(),
             null, StdDateFormat.instance, null,
             Locale.getDefault(),
-//            TimeZone.getDefault()
-            TimeZone.getTimeZone("GMT"),
+            null, // to indicate "use default TimeZone"
             Base64Variants.getDefaultVariant() // 2.1
     );
 

src/main/java/com/fasterxml/jackson/databind/SerializerProvider.java

@@ -997,14 +997,13 @@ public final void defaultSerializeField(String fieldName, Object value, JsonGene
      * Note: date here means "full" date, that is, date AND time, as per
      * Java convention (and not date-only values like in SQL)
      */
-    public final void defaultSerializeDateValue(long timestamp, JsonGenerator jgen)
+    public final void defaultSerializeDateValue(long timestamp, JsonGenerator gen)
         throws IOException
     {
-        // [JACKSON-87]: Support both numeric timestamps and textual
         if (isEnabled(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)) {
-            jgen.writeNumber(timestamp);
+            gen.writeNumber(timestamp);
         } else {
-            jgen.writeString(_dateFormat().format(new Date(timestamp)));
+            gen.writeString(_dateFormat().format(new Date(timestamp)));
         }
     }
 
@@ -1015,10 +1014,8 @@ public final void defaultSerializeDateValue(long timestamp, JsonGenerator jgen)
      * Note: date here means "full" date, that is, date AND time, as per
      * Java convention (and not date-only values like in SQL)
      */
-    public final void defaultSerializeDateValue(Date date, JsonGenerator gen)
-        throws IOException
+    public final void defaultSerializeDateValue(Date date, JsonGenerator gen) throws IOException
     {
-        // [JACKSON-87]: Support both numeric timestamps and textual
         if (isEnabled(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)) {
             gen.writeNumber(date.getTime());
         } else {
@@ -1031,8 +1028,7 @@ public final void defaultSerializeDateValue(Date date, JsonGenerator gen)
      * based on {@link SerializationFeature#WRITE_DATE_KEYS_AS_TIMESTAMPS}
      * value (and if using textual representation, configured date format)
      */
-    public void defaultSerializeDateKey(long timestamp, JsonGenerator gen)
-        throws IOException
+    public void defaultSerializeDateKey(long timestamp, JsonGenerator gen) throws IOException
     {
         if (isEnabled(SerializationFeature.WRITE_DATE_KEYS_AS_TIMESTAMPS)) {
             gen.writeFieldName(String.valueOf(timestamp));
@@ -1242,11 +1238,14 @@ protected final DateFormat _dateFormat()
          */
         DateFormat df = _config.getDateFormat();
         _dateFormat = df = (DateFormat) df.clone();
-        // 11-Jun-2015, tatu: Plus caller may have actually changed default TimeZone to use
+        // [databind#939]: 26-Sep-2015, tatu: With 2.6, formatter has been (pre)configured
+        // with TimeZone, so we should NOT try overriding it unlike with earlier versions
+        /*
         TimeZone tz = getTimeZone();
         if (tz != df.getTimeZone()) {
             df.setTimeZone(tz);
         }
+        */
         return df;
     }
 }

src/main/java/com/fasterxml/jackson/databind/cfg/BaseSettings.java

@@ -26,6 +26,16 @@ public final class BaseSettings
     // for 2.6
     private static final long serialVersionUID = 1L;
 
+    /**
+     * We will use a default TimeZone as the baseline.
+     */
+    private static final TimeZone DEFAULT_TIMEZONE = 
+            //  TimeZone.getDefault()
+            /* [databind#915] 26-Sep-2015, tatu: Should be UTC, plan to change
+             * it so for 2.7
+             */
+            TimeZone.getTimeZone("GMT");
+
     /*
     /**********************************************************
     /* Configuration settings; introspection, related
@@ -109,11 +119,11 @@ public final class BaseSettings
     protected final Locale _locale;
 
     /**
-     * Default {@link java.util.TimeZone} used with serialization formats.
-     * Default value is {@link TimeZone#getDefault()}, which is typically the
-     * local time zone (unless overridden for JVM).
+     * Default {@link java.util.TimeZone} used with serialization formats,
+     * if (and only if!) explicitly set by use; otherwise `null` to indicate
+     * "use default", which currently (Jackson 2.6) means "GMT"
      *<p>
-     * Note that if a new value is set, time zone is also assigned to
+     * Note that if a new value is set, timezone is also assigned to
      * {@link #_dateFormat} of this object.
      */
     protected final TimeZone _timeZone;
@@ -231,6 +241,11 @@ public BaseSettings withDateFormat(DateFormat df) {
         if (_dateFormat == df) {
             return this;
         }
+        // 26-Sep-2015, tatu: Related to [databind#939], let's try to force TimeZone if
+        //   (but only if!) it has been set explicitly.
+        if ((df != null) && hasExplicitTimeZone()) {
+            df = _force(df, _timeZone);
+        }
         return new BaseSettings(_classIntrospector, _annotationIntrospector, _visibilityChecker, _propertyNamingStrategy, _typeFactory,
                 _typeResolverBuilder, df, _handlerInstantiator, _locale,
                 _timeZone, _defaultBase64);
@@ -264,14 +279,11 @@ public BaseSettings with(TimeZone tz)
         if (tz == null) {
             throw new IllegalArgumentException();
         }
-        DateFormat df = _dateFormat;
-        if (df instanceof StdDateFormat) {
-            df = ((StdDateFormat) df).withTimeZone(tz);
-        } else {
-            // we don't know if original format might be shared; better create a clone:
-            df = (DateFormat) df.clone();
-            df.setTimeZone(tz);
+        if (tz == _timeZone) {
+            return this;
         }
+
+        DateFormat df = _force(_dateFormat, tz);
         return new BaseSettings(_classIntrospector, _annotationIntrospector,
                 _visibilityChecker, _propertyNamingStrategy, _typeFactory,
                 _typeResolverBuilder, df, _handlerInstantiator, _locale,
@@ -334,10 +346,39 @@ public Locale getLocale() {
     }
 
     public TimeZone getTimeZone() {
-        return _timeZone;
+        TimeZone tz = _timeZone;
+        return (tz == null) ? DEFAULT_TIMEZONE : tz;
     }
 
+    /**
+     * Accessor that may be called to determine whether this settings object
+     * has been explicitly configured with a TimeZone (true), or is still
+     * relying on the default settings (false).
+     *
+     * @since 2.7
+     */
+    public boolean hasExplicitTimeZone() {
+        return (_timeZone != null);
+    }
+
     public Base64Variant getBase64Variant() {
         return _defaultBase64;
     }
+
+    /*
+    /**********************************************************
+    /* Helper methods
+    /**********************************************************
+     */
+
+    private DateFormat _force(DateFormat df, TimeZone tz)
+    {
+        if (df instanceof StdDateFormat) {
+            return ((StdDateFormat) df).withTimeZone(tz);
+        }
+        // we don't know if original format might be shared; better create a clone:
+        df = (DateFormat) df.clone();
+        df.setTimeZone(tz);
+        return df;
+    }
 }

src/main/java/com/fasterxml/jackson/databind/ser/std/StdKeySerializers.java

@@ -83,6 +83,7 @@ public static JsonSerializer<Object> getStdKeySerializer(JavaType keyType) {
     /**
      * @deprecated since 2.7
      */
+    @Deprecated
     public static JsonSerializer<Object> getDefault() {
         return DEFAULT_KEY_SERIALIZER;
     }

src/main/java/com/fasterxml/jackson/databind/util/StdDateFormat.java

@@ -149,7 +149,7 @@ public StdDateFormat withTimeZone(TimeZone tz) {
         if (tz == null) {
             tz = DEFAULT_TIMEZONE;
         }
-        if (tz.equals(_timezone)) {
+        if ((tz == _timezone) || tz.equals(_timezone)) {
             return this;
         }
         return new StdDateFormat(tz, _locale);

src/test/java/com/fasterxml/jackson/databind/deser/TestMapDeserialization.java

@@ -11,7 +11,6 @@
 import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.*;
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
-import com.fasterxml.jackson.databind.deser.TestCollectionDeserialization.XBean;
 import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
 
 @SuppressWarnings("serial")