不能再使用Google App Engine（Java）中的JSONObject了吗？

Question

Half an hour ago I opened Eclipse to edit a Google App Engine app, previously everything was working fine, no errors, I haven't updated anything (at least not knowingly).

I had imported: com.google.appengine.repackaged.org.json.JSONObject without error, however now I get this error:

use of com.google.appengine.repackaged may result in your app breaking without warning

It has never broken before, it came with the Google App Engine download for Eclipse, why has it suddenly started now? And how can I get rid of it? (they change I was making was very small and quick, it would be nice not to have to use a different JSON library)

Answer 1

com.google.appengine.repackaged.* contains internal classes that should not be used by application code.

org.json is implemented by many libraries , for example JSON-Java . Simply include one of them in your GAE project.

Answer 2

AppEngine 1.8.4 use

com.google.appengine.labs.repackaged.org.json.JSONObject

Answer 3

In case you don't want to have to figure this all out from first principles, here is a step-by-step:

1. Get the sources from https://github.com/douglascrockford/JSON-java (you can download the zip, use Git, etc.)
2. Make a directory in your project json/org/json and put the sources in there.
3. Use "Refresh" in Eclipse so that it sees and compiles the directory.
4. Change all the "import com.google.appengine.repackaged.org.json.xxx;" to "import org.json.xxx;" in your code

Unfortunately this adds a whole lot of Warnings, but they do seem to be harmless.

Answer 4

To get rid of Use of com.google.appengine.repackaged may result in your app breaking without warning. error simple declare your class with full package name . It solves your problem.

com.google.appengine.repackaged.com.google.gson.JsonObject jsonObject = 
new com.google.appengine.repackaged.com.google.gson.JsonObject();

Answer 5

将我的导入更改为com.google.gson.Gson对我有用。

Answer 6

Package com.google.appengine.repackaged.com.google.gson has been deprecated on the latest appengine version. Therefore the following statements

import com.google.appengine.repackaged.com.google.gson.Gson;
import com.google.appengine.repackaged.com.google.gson.GsonBuilder;
...
Gson gson = new GsonBuilder().create();

will you give you the following error in your appgengine logs:

java.lang.NoClassDefFoundError: com/google/appengine/repackaged/com/google/gson/JsonElement

You need to use the new Json library instead:

1) add new dependency to your gradle file:

compile 'com.google.code.gson:gson:2.8.1' 

2) replace

import com.google.appengine.repackaged.com.google.gson.Gson;
import com.google.appengine.repackaged.com.google.gson.GsonBuilder;

with

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;