带有凌空的HTTP帖子获得NullPointerException：尝试从字段读取'byte[] c.a.b.l.b'

Question

我使用volley向webservice发送POST请求。它工作得很好，但有时，我不知道为什么，我得到这个错误，我不知道原因和如何控制它。我启用了ACRA，这是关于我得到的错误的主要信息:

....
02-25 05:35:52.952 D/InputMethodManager( 9979): prepareNavigationBarInfo() DecorView@72d70fd[ExportarDatos]
02-25 05:35:52.952 D/InputMethodManager( 9979): getNavigationBarColor() -855310
02-25 05:35:52.968 E/ViewRootImpl( 9979): sendUserActionEvent() mView returned.
02-25 05:35:53.194 D/VOLLEY BODY SEND( 9979): {"data":{"type":.... rest of my json object}}
02-25 05:35:53.197 I/System.out( 9979): (HTTPLog)-Static: isSBSettingEnabled false
02-25 05:35:53.197 I/System.out( 9979): (HTTPLog)-Static: isSBSettingEnabled false
02-25 05:35:56.043 I/System.out( 9979): (HTTPLog)-Static: isSBSettingEnabled false
02-25 05:35:56.043 I/System.out( 9979): (HTTPLog)-Static: isSBSettingEnabled false
02-25 05:36:01.196 E/VOLLEY  ( 9979): c.a.b.t
02-25 05:36:01.209 D/AndroidRuntime( 9979): Shutting down VM
--------- beginning of crash
02-25 05:36:01.211 E/AndroidRuntime( 9979): FATAL EXCEPTION: main
02-25 05:36:01.211 E/AndroidRuntime( 9979): Process: com.mypack.myapp, PID: 9979
02-25 05:36:01.211 E/AndroidRuntime( 9979): **java.lang.NullPointerException: Attempt to read from field 'byte[] c.a.b.l.b' on a null object reference**
02-25 05:36:01.211 E/AndroidRuntime( 9979): tat com.mypack.myapp.ExportarDatos$c.a(ExportarDatos.java:2)
02-25 05:36:01.211 E/AndroidRuntime( 9979): tat c.a.b.o.a(Request.java:7)
02-25 05:36:01.211 E/AndroidRuntime( 9979): tat c.a.b.g$b.run(ExecutorDelivery.java:6)
02-25 05:36:01.211 E/AndroidRuntime( 9979): tat android.os.Handler.handleCallback(Handler.java:883)
02-25 05:36:01.211 E/AndroidRuntime( 9979): tat android.os.Handler.dispatchMessage(Handler.java:100)
02-25 05:36:01.211 E/AndroidRuntime( 9979): tat android.os.Looper.loop(Looper.java:237)
02-25 05:36:01.211 E/AndroidRuntime( 9979): tat android.app.ActivityThread.main(ActivityThread.java:8107)
02-25 05:36:01.211 E/AndroidRuntime( 9979): tat java.lang.reflect.Method.invoke(Native Method)
02-25 05:36:01.211 E/AndroidRuntime( 9979): tat com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:496)
02-25 05:36:01.211 E/AndroidRuntime( 9979): tat com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1100)
02-25 05:36:01.213 E/ACRA    ( 9979): ACRA caught a NullPointerException for com.mypack.myapp
02-25 05:36:01.213 E/ACRA    ( 9979): java.lang.NullPointerException: Attempt to read from field 'byte[] c.a.b.l.b' on a null object reference
02-25 05:36:01.213 E/ACRA    ( 9979): tat com.mypack.myapp.ExportarDatos$c.a(ExportarDatos.java:2)
02-25 05:36:01.213 E/ACRA    ( 9979): tat c.a.b.o.a(Request.java:7)
02-25 05:36:01.213 E/ACRA    ( 9979): tat c.a.b.g$b.run(ExecutorDelivery.java:6)
02-25 05:36:01.213 E/ACRA    ( 9979): tat android.os.Handler.handleCallback(Handler.java:883)
02-25 05:36:01.213 E/ACRA    ( 9979): tat android.os.Handler.dispatchMessage(Handler.java:100)
02-25 05:36:01.213 E/ACRA    ( 9979): tat android.os.Looper.loop(Looper.java:237)
02-25 05:36:01.213 E/ACRA    ( 9979): tat android.app.ActivityThread.main(ActivityThread.java:8107)
02-25 05:36:01.213 E/ACRA    ( 9979): tat java.lang.reflect.Method.invoke(Native Method)
02-25 05:36:01.213 E/ACRA    ( 9979): tat com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:496)
02-25 05:36:01.213 E/ACRA    ( 9979): tat com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1100)",
...

这是发送POST/PATCH请求到webservice的函数。正如我所说的，它在大多数时候工作得很好，但有时我得到错误，我不知道何时也不知道为什么:

private void SendRequest(String url, JSONObject jsonBody, boolean lPost) {
if (mRequestQueue == null) {
mRequestQueue = Volley.newRequestQueue(this);
}
final String mRequestBody = jsonBody.toString();
Log.d("VOLLEY BODY SEND", mRequestBody);
int nMetodo = Request.Method.POST;
if (!lPost) nMetodo = Request.Method.PATCH;
StringRequest stringRequest = new StringRequest(nMetodo, urlbase + url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.i("VOLLEY", response);
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e("VOLLEY", error.toString());
error.networkResponse.data.toString();
try {
String body = new String(error.networkResponse.data, "UTF-8");
Log.d("VOLLEY_ERROR", body);
txtError.setText(body);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
}) {
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> params = new HashMap<String, String>();
params.put("Accept", "application/vnd.api+json");
params.put("Content-Type", "application/vnd.api+json");
params.put("api-key", cparam);
return params;
}
@Override
public byte[] getBody() throws AuthFailureError {
try {
return mRequestBody == null ? null : mRequestBody.getBytes("utf-8");
} catch (UnsupportedEncodingException uee) {
VolleyLog.wtf("Unsupported Encoding while trying to get the bytes of %s using %s", mRequestBody, "utf-8");
return null;
}
}
@Override
protected Response<String> parseNetworkResponse(NetworkResponse response) {
String responseString = "";
if (response != null) {
responseString = String.valueOf(response.statusCode);
// can get more details such as response.headers
Log.d("VOLLEY", responseString);
String json = "";
try {
json = new String(response.data, HttpHeaderParser.parseCharset(response.headers));
jsonObjectRcv = new JSONObject(json);
// Process received object
handler.postDelayed(new Runnable() {
@Override
public void run() {
ProcessResponse(jsonObjectRcv);
}
}, 50);
} catch (Exception e) {
Log.d("VOLLEY", e.getMessage());
}
}
return Response.success(responseString, HttpHeaderParser.parseCacheHeaders(response));
}
};
// Add to queue
mRequestQueue.add(stringRequest);
}

urlbase是webservice的主url。url参数是POST/PATCH的端点+资源。jsonBody是一个JSON对象，它包含我想POST或PATH的信息，它是正确的。我很确定，因为它包含在ACRA的

行中:

02-25 05:35:53.194 D/VOLLEY BODY SEND( 9979): {"data":{"type":.... rest of my json object}} 

我想我已经添加了所有关于我的问题的信息来获得帮助，但是问我是否需要添加更多的信息，我会更新我的问题。我不知道什么是抛出Nullpointer异常

我想捕获错误并让用户重试。现在，ACRA错误启动，应用程序停止工作。

Answer 1

经过大量的测试、失败和研究，问题是e.printStackTrace();。我擦掉了这条线，用Log替换了它。E和问题一起出去。