小编ste*_*enm的帖子

我收到一个NullPointerException非常小的细节,当我试图setServiceAccountUser(ACCOUNT_TO_IMPERSONATE)在我GoogleCredential,构建一个谷歌任务服务对象,然后试图发送一个请求,从任务列表ACCOUNT_TO_IMPERSONATE.

def credential = new GoogleCredential.Builder()
    .setTransport(HTTP_TRANSPORT)
    .setJsonFactory(JSON_FACTORY)
    .setServiceAccountId(SERVICE_ACCOUNT_ID)
    .setServiceAccountPrivateKeyFromP12File(P12_FILE)
    .setServiceAccountScopes(GOOGLE_TASK_SCOPES)
    .setServiceAccountUser(ACCOUNT_TO_IMPERSONATE)
    .build()

    credential.refreshToken()
    log.debug("Google Credential Impersonating: ${credential.getServiceAccountUser()}")

    def service = new com.google.api.services.tasks.Tasks.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential).build()

    return service

请注意,credential.getServiceAccountUser()预期的日志ACCOUNT_TO_IMPERSONATE.

在https://github.com/googleads/googleads-java-lib/issues/19中报告了类似的问题

StackTrace :
Caused by: 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.auth.oauth2.TokenRequest.execute(TokenRequest.java:307)
at com.google.api.client.auth.oauth2.Credential.executeRefreshToken(Credential.java:570)
at com.google.api.client.googleapis.auth.oauth2.GoogleCredential.executeRefreshToken(GoogleCredential.java:247)
at com.google.api.client.auth.oauth2.Credential.refreshToken(Credential.java:489)
at com.google.api.ads.common.lib.auth.OAuth2Helper.callRefreshToken(OAuth2Helper.java:70)
at com.google.api.ads.common.lib.auth.OfflineCredentials.generateCredential(OfflineCredentials.java:144)
...

错误中缺少详细信息据说是旧版Google任务中的一个问题,但我已升级到最新版本并且没有任何区别.

compile "com.google.api-client:google-api-client:1.19.0"
compile 'com.google.apis:google-api-services-tasks:v1-rev41-1.19.0' …

我们希望将Google Tasks API集成到我们的Grails Web应用程序中,但是我对于同步任务和防止数据冲突有很多顾虑.

1. 在授权Google帐户中创建任务时,同步任务的最佳做法是什么.我们是否应该定期创建一个轮询这些服务的服务,或者我们是否可以通过编程方式在用户的Google帐户中启用某种Push更新,以便通知我们的Web应用程序更改？

2. 在Google帐户中操作同一任务时,我们如何防止用户在我们的系统中编辑任务时产生的冲突？有没有可用的版本/锁定？