适用于ObjectMapper的Android Spring ClassNotFoundException [英] Android Spring ClassNotFoundException For ObjectMapper

问题描述

我的Android项目中有这个烦人的异常.我想做的就是将json发布到我的rest服务.我的问题是我不能使用MappingJackson2HttpMessageConverter.无论我做什么，都会不断抛出异常:

I'm having this annoying exception in my Android project. What I'm trying to do is to post json to my rest service. My problem is that I can't use the MappingJackson2HttpMessageConverter. Whatever I do it keeps throwing an exception:

04-27 19:58:33.124: E/AndroidRuntime(12924): FATAL EXCEPTION: AsyncTask #2
04-27 19:58:33.124: E/AndroidRuntime(12924): Process: com.restclient.trafficspy, PID: 12924
04-27 19:58:33.124: E/AndroidRuntime(12924): java.lang.RuntimeException: An error occured while executing doInBackground()
04-27 19:58:33.124: E/AndroidRuntime(12924):    at android.os.AsyncTask$3.done(AsyncTask.java:304)
04-27 19:58:33.124: E/AndroidRuntime(12924):    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
04-27 19:58:33.124: E/AndroidRuntime(12924):    at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
04-27 19:58:33.124: E/AndroidRuntime(12924):    at java.util.concurrent.FutureTask.run(FutureTask.java:242)
04-27 19:58:33.124: E/AndroidRuntime(12924):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
04-27 19:58:33.124: E/AndroidRuntime(12924):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
04-27 19:58:33.124: E/AndroidRuntime(12924):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
04-27 19:58:33.124: E/AndroidRuntime(12924):    at java.lang.Thread.run(Thread.java:818)
04-27 19:58:33.124: E/AndroidRuntime(12924): Caused by: java.lang.NoClassDefFoundError: Failed resolution of: Lcom/fasterxml/jackson/databind/ObjectMapper;
04-27 19:58:33.124: E/AndroidRuntime(12924):    at org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.<init>(MappingJackson2HttpMessageConverter.java:55)
04-27 19:58:33.124: E/AndroidRuntime(12924):    at com.restclient.trafficspy.RestServiceClient.doInBackground(RestServiceClient.java:51)
04-27 19:58:33.124: E/AndroidRuntime(12924):    at com.restclient.trafficspy.RestServiceClient.doInBackground(RestServiceClient.java:1)
04-27 19:58:33.124: E/AndroidRuntime(12924):    at android.os.AsyncTask$2.call(AsyncTask.java:292)
04-27 19:58:33.124: E/AndroidRuntime(12924):    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
04-27 19:58:33.124: E/AndroidRuntime(12924):    ... 4 more
04-27 19:58:33.124: E/AndroidRuntime(12924): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.fasterxml.jackson.databind.ObjectMapper" on path: DexPathList[[zip file "/data/app/com.restclient.trafficspy-2/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
04-27 19:58:33.124: E/AndroidRuntime(12924):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
04-27 19:58:33.124: E/AndroidRuntime(12924):    at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
04-27 19:58:33.124: E/AndroidRuntime(12924):    at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
04-27 19:58:33.124: E/AndroidRuntime(12924):    ... 9 more
04-27 19:58:33.124: E/AndroidRuntime(12924):    Suppressed: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.ObjectMapper
04-27 19:58:33.124: E/AndroidRuntime(12924):        at java.lang.Class.classForName(Native Method)
04-27 19:58:33.124: E/AndroidRuntime(12924):        at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
04-27 19:58:33.124: E/AndroidRuntime(12924):        at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
04-27 19:58:33.124: E/AndroidRuntime(12924):        at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
04-27 19:58:33.124: E/AndroidRuntime(12924):        ... 10 more
04-27 19:58:33.124: E/AndroidRuntime(12924):    Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

我不使用Maven或Gradle，并且我不想.这是我添加的罐子.我不认为我会丢失任何东西.

I'm not using Maven or Gradle and I don't want to. Here are tha jars that I have added. I don't think I'm missing something.

您是否知道导致问题的原因以及如何解决?随时询问您是否需要更多信息.谢谢！

Do you have any idea what causes the problem and how to fix it? Feel free to ask if you need more information. Thanks!

推荐答案

Okey，当我将MappingJackson2HttpMessageConverter更改为GsonHttpMessageConverter时，它起作用了.这不能解决ClassNotFoundException问题，但是对我来说是一种解决方案.

Okey, It worked when I changed MappingJackson2HttpMessageConverter to GsonHttpMessageConverter. This doesn't solve the ClassNotFoundException problem but it is a solution that works for me.

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