android应用程序中引发java.lang.NoSuchMethodError

Question

Im using a pure java project for communicating with an HTTP server. In this project i'm using Executors.newSingleThreadExecutor() to run a backrground work of an HTTP post request.

the background operation is processesing the HttpPost request by using DefaultHttpClient.execute(HttpPost)

when im using this jar in my android project i get exception:

FATAL EXCEPTION: pool1-thread1
java.lang.NoSuchMethodError: org.apache.http.impl.client.DefaultHttpClient.execute at...

Any idea why I get that?

Thanks

Answer 1

The version of the Apache classes you compiled with doesn't match the version you are executing with, and specifically they are not the same.

Compare your DefaultHttpClient class imported in your jar project with the android implementation of DefaultHttpClient.

I would also suggest to build a android library project with same functionality to avoid such errors as not all classes are implemented the same way in android as in java.To learn more on how to build android library project refer- http://developer.android.com/tools/projects/projects-eclipse.html#SettingUpLibraryProject