尝试运行谷歌驱动程序示例时发生java.lang.NullPointerException [英] java.lang.NullPointerException while trying to run google driver example

问题描述

大家好，我想用google drive api来完成一些任务，不过我刚接触Drive API，OAuth2.0协议。遵循这个例子，我最终得到了这个例外，我真的不知道不知道发生了什么我复制了该示例，如同复制/过去，添加了我的CLIENT_ID，CLIENT_SECRET和REDIRECT_URI，但没有任何结果。

这是错误

 线程mainjava中的异常.lang.NullPointerException 
 
，位于com.google.api.client.repackaged.com.google.common.base.Preconditions.checkNotNull（Preconditions.java:191）
 com.google。 api.client.util.Preconditions.checkNotNull（Preconditions.java:127）
 at com.google.api.client.json.jackson2.JacksonFactory.createJsonParser（JacksonFactory.java:96）
 at com。 google.api.client.json.JsonObjectParser.parseAndClose（JsonObjectParser.java:85）
 at com.google.api.client.json.JsonObjectParser.parseAndClose（JsonObjectParser.java:81）
 at com。 google.api.client.auth.oauth2.TokenResponseException.from（TokenResponseException.java:88）
，位于com.google.api.client.auth.oauth2.TokenRequest.executeUnparsed（TokenRequest.java:287）
 at com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeTokenRequest.execute（GoogleAuthorizationCodeTokenRequest.java:158）
 at com .gpaps.apps.expensesmanager.google.drive.DriverReportExporter.main（DriverReportExporter.java:47）
  

当我调用 GoogleTokenResponse response = flow.newTokenRequest（code）.setRedirectUri（REDIRECT_URI）.execute（）;

时，抛出异常

我检查了每个对象，并且一切正常。

感谢您提前帮助我:) 解决方案

错误通过客户端库源代码，NPE似乎源于 response.getContent（）返回null在 TokenResponseException.from（） 。我不知道为什么响应没有任何内容，但是这是一个错误，即客户端库不会检测到这个状态并更合适地处理它。目前已有公开问题该项目的问题跟踪解决问题。

Hi guys I want to use google drive api to do some task, however I new to Drive API, OAuth2.0 protocol too. Following this example I end up with this exception which I really don't understand what is happening I copied the example as is copy/past, added my CLIENT_ID, CLIENT_SECRET and REDIRECT_URI but nothing.

Here is the error

Exception in thread "main" java.lang.NullPointerException

    at com.google.api.client.repackaged.com.google.common.base.Preconditions.checkNotNull(Preconditions.java:191)
    at com.google.api.client.util.Preconditions.checkNotNull(Preconditions.java:127)
    at com.google.api.client.json.jackson2.JacksonFactory.createJsonParser(JacksonFactory.java:96)
    at com.google.api.client.json.JsonObjectParser.parseAndClose(JsonObjectParser.java:85)
    at com.google.api.client.json.JsonObjectParser.parseAndClose(JsonObjectParser.java:81)
    at com.google.api.client.auth.oauth2.TokenResponseException.from(TokenResponseException.java:88)
    at com.google.api.client.auth.oauth2.TokenRequest.executeUnparsed(TokenRequest.java:287)
    at com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeTokenRequest.execute(GoogleAuthorizationCodeTokenRequest.java:158)
    at com.gpaps.apps.expensesmanager.google.drive.DriverReportExporter.main(DriverReportExporter.java:47) 

The exception is thrown when I call GoogleTokenResponse response = flow.newTokenRequest(code).setRedirectUri(REDIRECT_URI).execute();

I checked every object and everything was Ok.

Thanks for helping me in advance :)

解决方案

Tracing the error through the client library source code, the NPE appears to stem from response.getContent() returning null here in TokenResponseException.from(). I'm not sure why the response would not have any content, but it's a bug that the client library doesn't detect this state and handle it more appropriately. There is already an open issue on the project's issue tracker to fix the problem.

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