无法从Mule消息中提取OAuth访问令牌

我试图在Mule连接器中实现Oauth2，为此我使用Mule Devkit连接器平台的默认方法。但在验证后，由于以下错误，我无法使用令牌。 请帮忙。附带的堆栈跟踪将有所帮助

   Root Exception stack trace:
java.lang.IllegalArgumentException: OAuth access token could not be extracted from: {
  "access_token" : "ya29.GlzxA5CJ8FcIay3YXE7sG2spkYYfkcTei6NW_gunsIPW2kSYJToKh1oOyUwkRoy-p-iuGIwLsi5gKvzhZQPMY9wjPkdxR6YJYVswtR3K3iGXlidqbp1_LAQoEHoX0w",
  "expires_in" : 3599,
  "token_type" : "Bearer"
}
    at org.mule.security.oauth.util.DefaultOAuthResponseParser.extractAccessCode(DefaultOAuthResponseParser.java:36)
    at org.mule.security.oauth.BaseOAuth2Manager.fetchAndExtract(BaseOAuth2Manager.java:586)
    at org.mule.security.oauth.BaseOAuth2Manager.fetchAccessToken(BaseOAuth2Manager.java:432)
    at org.mule.modules.drivecon2.adapters.DriveCon2ConnectorOAuth2Adapter.fetchAccessToken(DriveCon2ConnectorOAuth2Adapter.java:207)
    at org.mule.security.oauth.processor.OAuth2FetchAccessTokenMessageProcessor.doProcess(OAuth2FetchAccessTokenMessageProcessor.java:68)
    at org.mule.devkit.processor.DevkitBasedMessageProcessor.process(DevkitBasedMessageProcessor.java:89)
    at org.mule.execution.ExceptionToMessagingExceptionExecutionInterceptor.execute(ExceptionToMessagingExceptionExecutionInterceptor.java:27)
    at org.mule.execution.MessageProcessorNotificationExecutionInterceptor.execute(MessageProcessorNotificationExecutionInterceptor.java:108)
    at org.mule.execution.MessageProcessorExecutionTemplate.execute(MessageProcessorExecutionTemplate.java:44)
    at org.mule.processor.BlockingProcessorExecutor.executeNext(BlockingProcessorExecutor.java:88)
    at org.mule.processor.BlockingProcessorExecutor.execute(BlockingProcessorExecutor.java:59)
    at org.mule.execution.ExceptionToMessagingExceptionExecutionInterceptor.execute(ExceptionToMessagingExceptionExecutionInterceptor.java:27)
    at org.mule.execution.MessageProcessorNotificationExecutionInterceptor.execute(MessageProcessorNotificationExecutionInterceptor.java:108)
    at org.mule.execution.MessageProcessorExecutionTemplate.execute(MessageProcessorExecutionTemplate.java:44)
    at org.mule.execution.ExceptionToMessagingExceptionExecutionInterceptor.execute(ExceptionToMessagingExceptionExecutionInterceptor.java:27)
    at org.mule.execution.MessageProcessorNotificationExecutionInterceptor.execute(MessageProcessorNotificationExecutionInterceptor.java:108)
    at org.mule.execution.MessageProcessorExecutionTemplate.execute(MessageProcessorExecutionTemplate.java:44)
    at org.mule.processor.BlockingProcessorExecutor.executeNext(BlockingProcessorExecutor.java:88)
    at org.mule.processor.BlockingProcessorExecutor.execute(BlockingProcessorExecutor.java:59)
    at org.mule.execution.ExceptionToMessagingExceptionExecutionInterceptor.execute(ExceptionToMessagingExceptionExecutionInterceptor.java:27)
    at org.mule.execution.MessageProcessorNotificationExecutionInterceptor.execute(MessageProcessorNotificationExecutionInterceptor.java:108)
    at org.mule.execution.MessageProcessorExecutionTemplate.execute(MessageProcessorExecutionTemplate.java:44)
    at org.mule.execution.ExceptionToMessagingExceptionExecutionInterceptor.execute(ExceptionToMessagingExceptionExecutionInterceptor.java:27)
    at org.mule.execution.MessageProcessorExecutionTemplate.execute(MessageProcessorExecutionTemplate.java:44)
    at org.mule.processor.BlockingProcessorExecutor.executeNext(BlockingProcessorExecutor.java:98)
    at org.mule.processor.BlockingProcessorExecutor.execute(BlockingProcessorExecutor.java:59)
    at org.mule.interceptor.AbstractEnvelopeInterceptor.processBlocking(AbstractEnvelopeInterceptor.java:58)
    at org.mule.processor.AbstractRequestResponseMessageProcessor.process(AbstractRequestResponseMessageProcessor.java:47)
    at org.mule.processor.AsyncInterceptingMessageProcessor.processNextTimed(AsyncInterceptingMessageProcessor.java:129)
    at org.mule.processor.AsyncInterceptingMessageProcessor$AsyncMessageProcessorWorker$1.process(AsyncInterceptingMessageProcessor.java:213)
    at org.mule.processor.AsyncInterceptingMessageProcessor$AsyncMessageProcessorWorker$1.process(AsyncInterceptingMessageProcessor.java:206)
    at org.mule.execution.ExecuteCallbackInterceptor.execute(ExecuteCallbackInterceptor.java:16)
    at org.mule.execution.CommitTransactionInterceptor.execute(CommitTransactionInterceptor.java:35)
    at org.mule.execution.CommitTransactionInterceptor.execute(CommitTransactionInterceptor.java:22)
    at org.mule.execution.HandleExceptionInterceptor.execute(HandleExceptionInterceptor.java:30)
    at org.mule.execution.HandleExceptionInterceptor.execute(HandleExceptionInterceptor.java:14)
    at org.mule.execution.BeginAndResolveTransactionInterceptor.execute(BeginAndResolveTransactionInterceptor.java:67)
    at org.mule.execution.ResolvePreviousTransactionInterceptor.execute(ResolvePreviousTransactionInterceptor.java:44)
    at org.mule.execution.SuspendXaTransactionInterceptor.execute(SuspendXaTransactionInterceptor.java:50)
    at org.mule.execution.ValidateTransactionalStateInterceptor.execute(ValidateTransactionalStateInterceptor.java:40)
    at org.mule.execution.IsolateCurrentTransactionInterceptor.execute(IsolateCurrentTransactionInterceptor.java:41)
    at org.mule.execution.ExternalTransactionInterceptor.execute(ExternalTransactionInterceptor.java:48)
    at org.mule.execution.RethrowExceptionInterceptor.execute(RethrowExceptionInterceptor.java:28)
    at org.mule.execution.RethrowExceptionInterceptor.execute(RethrowExceptionInterceptor.java:13)
    at org.mule.execution.TransactionalErrorHandlingExecutionTemplate.execute(TransactionalErrorHandlingExecutionTemplate.java:110)
    at org.mule.execution.TransactionalErrorHandlingExecutionTemplate.execute(TransactionalErrorHandlingExecutionTemplate.java:30)
    at org.mule.processor.AsyncInterceptingMessageProcessor$AsyncMessageProcessorWorker.doRun(AsyncInterceptingMessageProcessor.java:205)
    at org.mule.work.AbstractMuleEventWork.run(AbstractMuleEventWork.java:53)
    at org.mule.work.WorkerContext.run(WorkerContext.java:301)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

我发现了错误。 我正确地传递了凭证，但使用了错误的正则表达式。将访问令牌URL更改为低于该值。（用于谷歌身份验证响应。）

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我还在为谷歌开发一些OAuth2Mule流，其他的请看我的帖子

要提取令牌，我使用JSON到对象转换器，然后使用#[payload.access_令牌]

我相信令牌检索的正确url是www.googleapis.com:443/oauth2/v4/token，我认为这不起作用，因为存在信任存储问题，我也有accounts.google.com:443/o/oauth2/token在工作，但是后续的api调用需要www.googleapis.com端点，并返回令牌，此时信任问题返回。如果我有兴趣听听你的想法，我会发表评论，但没有足够的分数，很抱歉我的批评

     OAuth2(friendlyName = "OAuth 2.0", authorizationUrl = 
"https://accounts.google.com/o/oauth2/auth",
    accessTokenUrl = "https://accounts.google.com/o/oauth2/token",
     accessTokenRegex = "\"access_token\" : \"([^&]+?)\"", 
    expirationRegex = "\"expires_in\" : ([^&]+?),")