support both jdk 8 and 9

.travis.yml

@@ -2,6 +2,8 @@ language: java
 jdk:
   - oraclejdk8
   - openjdk8
+  - oraclejdk9
+  - openjdk9
   
 addons:
   mariadb: '10.0'

main/pom.xml

@@ -475,6 +475,11 @@
       <version>1.7.1</version>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>javax.xml.bind</groupId>
+      <artifactId>jaxb-api</artifactId>
+      <version>2.3.0</version>
+    </dependency>
   </dependencies>
 
 </project>

main/tests/server/src/com/google/refine/tests/expr/functions/date/DatePartTests.java

@@ -2,7 +2,6 @@ package com.google.refine.tests.expr.functions.date;
 
 import java.time.OffsetDateTime;
 import java.time.format.DateTimeFormatter;
-import java.time.format.DateTimeFormatterBuilder;
 import java.util.Calendar;
 import java.util.Date;
 import java.util.Properties;
@@ -58,12 +57,7 @@ public class DatePartTests extends RefineTest {
         }
     }
     
-    private DateTimeFormatter formatter = new DateTimeFormatterBuilder()
+    private  DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd-HH:mm:ss.SSSSSSSSSX");
-            .append(DateTimeFormatter.BASIC_ISO_DATE).appendLiteral('-')
-            .appendPattern("HH:mm:ss")
-            .appendPattern("[.SSSSSSSSS][.SSSSSS][.SSS]")       // optional nanos, with 9, 6 or 3 digits
-            .appendOffset("+HH:mm", "Z")
-            .toFormatter();
     
     @Test
     public void testOffsetDateTimeDatePart() {        

main/tests/server/src/com/google/refine/tests/expr/functions/date/IncTests.java

@@ -2,7 +2,6 @@ package com.google.refine.tests.expr.functions.date;
 
 import java.time.OffsetDateTime;
 import java.time.format.DateTimeFormatter;
-import java.time.format.DateTimeFormatterBuilder;
 import java.time.temporal.ChronoUnit;
 import java.util.Properties;
 
@@ -23,12 +22,7 @@ import com.google.refine.tests.util.TestUtils;
 
 public class IncTests extends RefineTest {
     private static Properties bindings;
-    private DateTimeFormatter formatter = new DateTimeFormatterBuilder()
+    private  DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd-HH:mm:ss.SSSSSSSSSX");
-            .append(DateTimeFormatter.BASIC_ISO_DATE).appendLiteral('-')
-            .appendPattern("HH:mm:ss")
-            .appendPattern("[.SSSSSSSSS][.SSSSSS][.SSS]")       // optional nanos, with 9, 6 or 3 digits
-            .appendOffset("+HH:mm", "Z")
-            .toFormatter();
     
     @Override
     @BeforeTest

main/tests/server/src/com/google/refine/tests/expr/functions/date/NowTests.java

@@ -2,7 +2,6 @@ package com.google.refine.tests.expr.functions.date;
 
 import java.time.OffsetDateTime;
 import java.time.format.DateTimeFormatter;
-import java.time.format.DateTimeFormatterBuilder;
 import java.util.Properties;
 
 import org.slf4j.LoggerFactory;
@@ -21,12 +20,7 @@ import com.google.refine.tests.util.TestUtils;
 
 public class NowTests extends RefineTest {
     private static Properties bindings;
-    private DateTimeFormatter formatter = new DateTimeFormatterBuilder()
+    private  DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMdd-HH:mm:ss.SSSSSSSSSX");
-            .append(DateTimeFormatter.BASIC_ISO_DATE).appendLiteral('-')
-            .appendPattern("HH:mm:ss")
-            .appendPattern("[.SSSSSSSSS][.SSSSSS][.SSS]")       // optional nanos, with 9, 6 or 3 digits
-            .appendOffset("+HH:mm", "Z")
-            .toFormatter();
     
     @Override
     @BeforeTest