Fix crash in JSON parser when parsing extensions on primitive elements

hapi-fhir-base/src/main/java/ca/uhn/fhir/parser/JsonParser.java

@@ -33,7 +33,6 @@ import ca.uhn.fhir.parser.json.*;
 import ca.uhn.fhir.parser.json.JsonLikeValue.ScalarType;
 import ca.uhn.fhir.parser.json.JsonLikeValue.ValueType;
 import ca.uhn.fhir.rest.api.EncodingEnum;
-import ca.uhn.fhir.util.BinaryUtil;
 import ca.uhn.fhir.util.ElementUtil;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
@@ -982,7 +981,7 @@ public class JsonParser extends BaseParser implements IJsonLikeParser {
 			for (int i = 0; i < nextArray.size(); i++) {
 				JsonLikeValue nextObject = nextArray.get(i);
 				JsonLikeValue nextAlternate = null;
-				if (nextAlternateArray != null) {
+				if (nextAlternateArray != null && nextAlternateArray.size() >= (i + 1)) {
 					nextAlternate = nextAlternateArray.get(i);
 				}
 				parseChildren(theState, theName, nextObject, nextAlternate, theAlternateName, true);

hapi-fhir-structures-r4/src/test/java/ca/uhn/fhir/parser/JsonParserR4Test.java

@@ -3,13 +3,17 @@ package ca.uhn.fhir.parser;
 import ca.uhn.fhir.context.FhirContext;
 import ca.uhn.fhir.util.TestUtil;
 import com.google.common.collect.Sets;
+import org.apache.commons.io.IOUtils;
 import org.hl7.fhir.r4.model.Bundle;
+import org.hl7.fhir.r4.model.Extension;
 import org.hl7.fhir.r4.model.Patient;
+import org.hl7.fhir.r4.model.StringType;
 import org.junit.AfterClass;
 import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.IOException;
 import java.util.HashSet;
 import java.util.Set;
 
@@ -21,6 +25,19 @@ public class JsonParserR4Test {
 	private static final Logger ourLog = LoggerFactory.getLogger(JsonParserR4Test.class);
 	private static FhirContext ourCtx = FhirContext.forR4();
 
+	@Test
+	public void testParseExtensionOnPrimitive() throws IOException {
+		String input = IOUtils.toString(JsonParserR4Test.class.getResourceAsStream("/extension-on-line.txt"));
+		IParser parser = ourCtx.newJsonParser().setPrettyPrint(true);
+		Patient pt = parser.parseResource(Patient.class, input);
+
+		StringType line0 = pt.getAddressFirstRep().getLine().get(0);
+		assertEquals("535 Sheppard Avenue West, Unit 1907", line0.getValue());
+		Extension houseNumberExt = line0.getExtensionByUrl("http://hl7.org/fhir/StructureDefinition/iso21090-ADXP-houseNumber");
+		assertEquals("535", ((StringType)houseNumberExt.getValue()).getValue());
+
+	}
+
 	@Test
 	public void testExcludeNothing() {
 		IParser parser = ourCtx.newJsonParser().setPrettyPrint(true);

hapi-fhir-structures-r4/src/test/resources/extension-on-line.txt

@@ -0,0 +1,58 @@
+{
+  "resourceType": "Patient",
+  "name": [
+    {
+      "family": "Doe",
+      "given": [
+        "John",
+        "W."
+      ]
+    }
+  ],
+  "gender": "male",
+  "birthDate": "2012-02-14",
+  "address": [
+    {
+      "use": "home",
+      "line": [
+        "535 Sheppard Avenue West, Unit 1907",
+        "RR 66, Station A, RPO 123"
+      ],
+      "_line": [
+        {
+          "extension": [
+            {
+              "url": "http://hl7.org/fhir/StructureDefinition/iso21090-ADXP-houseNumber",
+              "valueString": "535"
+            },
+            {
+              "url": "http://hl7.org/fhir/StructureDefinition/iso21090-ADXP-streetName",
+              "valueString": "Sheppard"
+            },
+            {
+              "url": "http://hl7.org/fhir/StructureDefinition/iso21090-ADXP-streetNameType",
+              "valueString": "Avenue"
+            },
+            {
+              "url": "http://hl7.org/fhir/StructureDefinition/iso21090-ADXP-direction",
+              "valueString": "West"
+            },
+            {
+              "url": "http://hl7.org/fhir/StructureDefinition/iso21090-ADXP-unitID",
+              "valueString": "1907"
+            },
+            {
+              "url": "http://hl7.org/fhir/StructureDefinition/iso21090-ADXP-postBox",
+              "valueString": "1234"
+            }
+          ]
+        }
+      ],
+      "city": "Toronto",
+      "state": "ON",
+      "postalCode": "M3H4X8"
+    }
+  ]
+}
+
+

src/changes/changes.xml

@@ -6,6 +6,15 @@
 		<title>HAPI FHIR Changelog</title>
 	</properties>
 	<body>
+		<release version="3.3.0" date="TBD">
+			<action type="fix">
+				Fix a crash in the JSON parser when parsing extensions on repeatable
+				elements (e.g. Patient.address.line) where there is an extension on the
+				first repetion but not on subsequent repetitions of the
+				repeatable primitive. Thanks to Igor Sirkovich for providing a
+				test case!
+			</action>
+		</release>
 		<release version="3.2.0" date="2018-01-13">
 			<action type="add">
 				Support for custom search parameters has been backported in the JPA server