升级到Java8和端点V2后，AppEngine错误

Question

在升级到Java 8和将端点升级到V2之后，我一直在获取服务器错误并在我的Appengine日志中收到以下错误：

private boolean isChromeInstalledAndVersionGreaterThan65() {
    PackageInfo pInfo;
    try {
        pInfo = getPackageManager().getPackageInfo("com.android.chrome", 0);
    } catch (PackageManager.NameNotFoundException e) {
        //chrome is not installed on the device
        return false;
    }
    if (pInfo != null) {
        //Chrome has versions like 68.0.3440.91, we need to find the major version
        //using the first dot we find in the string
        int firstDotIndex = pInfo.versionName.indexOf(".");
        //take only the number before the first dot excluding the dot itself
        String majorVersion = pInfo.versionName.substring(0, firstDotIndex);
        return Integer.parseInt(majorVersion) > 65;
    }
    return false;
}

Answer 1

原来是因为作为应用引擎升级的一部分，以下语句不再有效

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

您需要改用新的Json库：

1）向您的gradle文件添加新的依赖项：

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

2）替换

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

使用

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