fix for issue #582

json-path/src/main/java/com/jayway/jsonpath/spi/json/AbstractJsonProvider.java

@@ -153,7 +153,8 @@ public abstract class AbstractJsonProvider implements JsonProvider {
         } else if(obj instanceof String){
             return ((String)obj).length();
         }
-        throw new JsonPathException("length operation cannot be applied to " + obj!=null?obj.getClass().getName():"null");
+        throw new JsonPathException("length operation cannot be applied to " + (obj != null ? obj.getClass().getName()
+                : "null"));
     }
 
     /**

json-path/src/main/java/com/jayway/jsonpath/spi/json/GsonJsonProvider.java

@@ -246,9 +246,8 @@ public class GsonJsonProvider extends AbstractJsonProvider {
                 }
             }
         }
-
+        throw new JsonPathException("length operation can not applied to " + (obj != null ? obj.getClass().getName()
-        throw new JsonPathException("length operation can not applied to " + obj != null ? obj.getClass().getName()
+                                                                                         : "null"));
-                                                                                         : "null");
     }
 
     @Override

json-path/src/main/java/com/jayway/jsonpath/spi/json/JacksonJsonNodeJsonProvider.java

@@ -211,7 +211,8 @@ public class JacksonJsonNodeJsonProvider extends AbstractJsonProvider {
                 return element.size();
             }
         }
-        throw new JsonPathException("length operation can not applied to " + obj != null ? obj.getClass().getName() : "null");
+        throw new JsonPathException("length operation can not applied to " + (obj != null ? obj.getClass().getName()
+                : "null"));
     }
 
     @Override

json-path/src/main/java/com/jayway/jsonpath/spi/json/JsonOrgJsonProvider.java

@@ -170,7 +170,8 @@ public class JsonOrgJsonProvider extends AbstractJsonProvider {
                 return ((String) obj).length();
             }
         }
-        throw new JsonPathException("length operation can not applied to " + obj != null ? obj.getClass().getName() : "null");
+        throw new JsonPathException("length operation can not applied to " + (obj != null ? obj.getClass().getName()
+                : "null"));
     }
 
     @Override