(#317) Compatible with Jackson 2.9.x

Author: pan3793

src/main/java/com/networknt/schema/ContainsValidator.java

@@ -47,7 +47,8 @@ public Set<ValidationMessage> validate(JsonNode node, JsonNode rootNode, String
             return Collections.emptySet();
         }
 
-        if (node.isEmpty()) {
+        // to support jackson < 2.10
+        if (node.size() == 0) {
             // Array was empty
             return buildErrorMessageSet(at);
         } else if (node.isArray()) {

src/test/java/com/networknt/schema/CollectorContextTest.java

@@ -23,6 +23,7 @@
 import org.junit.Before;
 import org.junit.Test;
 
+import java.io.IOException;
 import java.util.*;
 
 public class CollectorContextTest {
@@ -96,7 +97,7 @@ public void testCollectorContextWithMultiplThreads() throws Exception {
 
     @SuppressWarnings("unchecked")
     @Test
-    public void testCollectorWithFormat() throws JsonMappingException, JsonProcessingException {
+    public void testCollectorWithFormat() throws JsonMappingException, JsonProcessingException, IOException {
         ObjectMapper objectMapper = new ObjectMapper();
         ValidationResult validationResult = jsonSchemaForCombine.validateAndCollect(objectMapper
                 .readTree("{\"property1\":\"sample1\",\"property2\":\"sample2\",\"property3\":\"sample3\" }"));
@@ -108,7 +109,7 @@ public void testCollectorWithFormat() throws JsonMappingException, JsonProcessin
 
     @SuppressWarnings("unchecked")
     @Test
-    public void testCollectorGetAll() throws JsonMappingException, JsonProcessingException {
+    public void testCollectorGetAll() throws JsonMappingException, JsonProcessingException, IOException {
         ObjectMapper objectMapper = new ObjectMapper();
         ValidationResult validationResult = jsonSchemaForCombine.validateAndCollect(objectMapper
                 .readTree("{\"property1\":\"sample1\",\"property2\":\"sample2\",\"property3\":\"sample3\" }"));

src/test/java/com/networknt/schema/UnknownMetaSchemaTest.java

@@ -1,11 +1,11 @@
 package com.networknt.schema;
 
-import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import org.junit.Assert;
 import org.junit.Test;
 
+import java.io.IOException;
 import java.util.Set;
 
 public class UnknownMetaSchemaTest {
@@ -17,7 +17,7 @@ public class UnknownMetaSchemaTest {
     private String json = "{\"data\":1}";
 
     @Test
-    public void testSchema1() throws JsonProcessingException {
+    public void testSchema1() throws IOException {
         ObjectMapper mapper = new ObjectMapper();
         JsonNode jsonNode = mapper.readTree(this.json);
 
@@ -31,7 +31,7 @@ public void testSchema1() throws JsonProcessingException {
     }
 
     @Test
-    public void testSchema2() throws JsonProcessingException {
+    public void testSchema2() throws IOException {
         ObjectMapper mapper = new ObjectMapper();
         JsonNode jsonNode = mapper.readTree(this.json);
 
@@ -44,7 +44,7 @@ public void testSchema2() throws JsonProcessingException {
         }
     }
     @Test
-    public void testSchema3() throws JsonProcessingException {
+    public void testSchema3() throws IOException {
         ObjectMapper mapper = new ObjectMapper();
         JsonNode jsonNode = mapper.readTree(this.json);