NullPointerException with JSON containing empty object using deep scanning path using JsonOrgJsonProvider.

[DavidAmmeraal]

This throws a NullPointerException when I'm using the JsonOrgJsonProvider. Using the default provider and mapper it works fine.

import com.jayway.jsonpath.Configuration;
import com.jayway.jsonpath.JsonPath;
import com.jayway.jsonpath.spi.json.JsonOrgJsonProvider;
import com.jayway.jsonpath.spi.mapper.JsonOrgMappingProvider;

public class JsonPathThrowsNullPointer {
		
	public static void main(String[] args) {
		String json = "{\"foo\": \"bar\", \"emptyObject\": {}}";

		Configuration config = Configuration.defaultConfiguration()
				.jsonProvider(new JsonOrgJsonProvider())
				.mappingProvider(new JsonOrgMappingProvider());
		
		Object result = JsonPath.using(config).parse(json).read("$..foo");
		System.out.println(result);
	}
	
}

Using:

<dependency>
  <groupId>com.jayway.jsonpath</groupId>
  <artifactId>json-path</artifactId>
  <version>2.3.0</version>
</dependency>

Exception stack trace:

Exception in thread "main" java.lang.NullPointerException at com.jayway.jsonpath.spi.json.JsonOrgJsonProvider.getPropertyKeys(JsonOrgJsonProvider.java:155) at com.jayway.jsonpath.internal.path.ScanPathToken$PropertyPathTokenPredicate.matches(ScanPathToken.java:202) at com.jayway.jsonpath.internal.path.ScanPathToken.walkObject(ScanPathToken.java:75) at com.jayway.jsonpath.internal.path.ScanPathToken.walk(ScanPathToken.java:41) at com.jayway.jsonpath.internal.path.ScanPathToken.walkObject(ScanPathToken.java:84) at com.jayway.jsonpath.internal.path.ScanPathToken.walk(ScanPathToken.java:41) at com.jayway.jsonpath.internal.path.ScanPathToken.evaluate(ScanPathToken.java:36) at com.jayway.jsonpath.internal.path.RootPathToken.evaluate(RootPathToken.java:62) at com.jayway.jsonpath.internal.path.CompiledPath.evaluate(CompiledPath.java:53) at com.jayway.jsonpath.internal.path.CompiledPath.evaluate(CompiledPath.java:61) at com.jayway.jsonpath.JsonPath.read(JsonPath.java:187) at com.jayway.jsonpath.internal.JsonContext.read(JsonContext.java:102) at com.jayway.jsonpath.internal.JsonContext.read(JsonContext.java:89) at JsonPathThrowsNullPointer.main(JsonPathThrowsNullPointer.java:17)

[kallestenflo]

Fixed by #699