源附件不包含文件ThreadPoolExecutor.class的源

Question

我正在开发一个使用我创建的webservice的android项目。它提前几分钟工作正常，但突然间它开始出现以下错误 源附件不包含文件threadpoolexecutor.class的来源

Logcat错误是：

07-10 11:30:22.844: E/AndroidRuntime(1707): FATAL EXCEPTION: AsyncTask #1
07-10 11:30:22.844: E/AndroidRuntime(1707): java.lang.RuntimeException: An error occured while executing doInBackground()
07-10 11:30:22.844: E/AndroidRuntime(1707):     at android.os.AsyncTask$3.done(AsyncTask.java:299)
07-10 11:30:22.844: E/AndroidRuntime(1707):     at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
07-10 11:30:22.844: E/AndroidRuntime(1707):     at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
07-10 11:30:22.844: E/AndroidRuntime(1707):     at java.util.concurrent.FutureTask.run(FutureTask.java:239)
07-10 11:30:22.844: E/AndroidRuntime(1707):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
07-10 11:30:22.844: E/AndroidRuntime(1707):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
07-10 11:30:22.844: E/AndroidRuntime(1707):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
07-10 11:30:22.844: E/AndroidRuntime(1707):     at java.lang.Thread.run(Thread.java:856)
07-10 11:30:22.844: E/AndroidRuntime(1707): Caused by: java.lang.NullPointerException
07-10 11:30:22.844: E/AndroidRuntime(1707):     at com.example.backgroundTask.BackgroundTask.RegisterUser(BackgroundTask.java:125)
07-10 11:30:22.844: E/AndroidRuntime(1707):     at com.example.backgroundTask.BackgroundTask.doInBackground(BackgroundTask.java:65)
07-10 11:30:22.844: E/AndroidRuntime(1707):     at com.example.backgroundTask.BackgroundTask.doInBackground(BackgroundTask.java:1)
07-10 11:30:22.844: E/AndroidRuntime(1707):     at android.os.AsyncTask$2.call(AsyncTask.java:287)
07-10 11:30:22.844: E/AndroidRuntime(1707):     at java.util.concurrent.FutureTask.run(FutureTask.java:234)
07-10 11:30:22.844: E/AndroidRuntime(1707):     ... 4 more
07-10 11:30:23.174: W/Trace(1707): Unexpected value from nativeGetEnabledTags: 0

请告诉我可能导致此错误的原因，或者如果需要更多信息，请告知我们。

谢谢＆amp;问候..
Sourabh

Answer 1

我找到了。我正在检查值，如果一切正常，它将从Web服务返回null。那个空值我试图转换为字符串值，从而解决上述错误 感谢CommonsWare。