fixed the cache key and the unit test (use the same key when fetching

and looking up cache) #94

json-path/src/main/java/com/jayway/jsonpath/internal/JsonReader.java

@@ -147,7 +147,7 @@ public class JsonReader implements ParseContext, DocumentContext {
         	return read(jsonPath);
         }else {
         	jsonPath = compile(path, filters);
-        	cache.put(path, jsonPath);
+        	cache.put(cacheKey, jsonPath);
         	return read(jsonPath);
         }
 

json-path/src/test/java/com/jayway/jsonpath/internal/JsonReaderTest.java

@@ -9,6 +9,7 @@ import org.junit.Test;
 
 import com.jayway.jsonpath.BaseTest;
 import com.jayway.jsonpath.Criteria;
+import com.jayway.jsonpath.DocumentContext;
 import com.jayway.jsonpath.Filter;
 import com.jayway.jsonpath.JsonPath;
 
@@ -20,8 +21,10 @@ public class JsonReaderTest extends BaseTest {
         Filter feq = Filter.filter(Criteria.where("category").eq("reference"));
         Filter fne = Filter.filter(Criteria.where("category").ne("reference"));
         
-        List<String> eq = JsonPath.parse(JSON_DOCUMENT).read("$.store.book[?].category", feq);
-        List<String> ne = JsonPath.parse(JSON_DOCUMENT).read("$.store.book[?].category", fne);
+        DocumentContext JsonDoc = JsonPath.parse(JSON_DOCUMENT);
+
+        List<String> eq = JsonDoc.read("$.store.book[?].category", feq);
+        List<String> ne = JsonDoc.read("$.store.book[?].category", fne);
 
         Assertions.assertThat(eq).contains("reference");
         Assertions.assertThat(ne).doesNotContain("reference");