android - ProGuard - org.codehaus.jackson.map.JsonMappingException : No suitable constructor found for type

Question

我有一个基于 Android 的应用程序，它使用 Rest 服务连接到 Google App Engine，该应用程序运行完美，直到它在发布之前通过 ProGuard 进行了混淆处理。

运行混淆后的应用程序时，LogCat报错为:

Unable to convert a [application/json,UTF-8] representation into an object of 
  class com.enterprisemk.android.bcw.bincollection.WasteCollectionAreasContainer

org.codehaus.jackson.map.JsonMappingException: No suitable constructor found 
  for type [simple type, class 
  com.enterprisemk.android.bcw.bincollection.WasteCollectionAreasContainer]: 
  can not instantiate from JSON object (need to add/enable type information?)

我的 proguard-project.txt 文件中有以下内容:

-keepattributes *Annotation*,EnclosingMethod

-keep public class org.w3c.** {public private protected *;}
-dontwarn org.w3c.**

-keep public class org.joda.time.** {public private protected *;}
-dontwarn org.joda.time.**

-keep public class org.restlet.** { *; }
-dontwarn org.restlet.**

-keep public class org.codehaus.** { *; }
-dontwarn org.codehaus.**

-keepattributes Signature
-keepnames class com.fasterxml.jackson.** { *; }
-dontwarn com.fasterxml.jackson.databind.**

我的类(class)错误指的是:

public class WasteCollectionAreasContainer {

 public List<WasteCollectionAreas> wasteCollectionAreasList;

 public List<WasteCollectionAreas> getWasteCollectionAreasList() {
     return wasteCollectionAreasList;
 }

 public void setWasteCollectionAreasist(List<WasteCollectionAreas> wasteCollectionAreasList) {
     this.wasteCollectionAreasList = wasteCollectionAreasList;
 }

 public WasteCollectionAreasContainer() {
     wasteCollectionAreasList = new ArrayList<WasteCollectionAreas>();
 }

 @JsonCreator
 public WasteCollectionAreasContainer(List<WasteCollectionAreas> wasteCollectionAreasList) {
     this.wasteCollectionAreasList = wasteCollectionAreasList;
 }
}

重申一下，在通过 ProGuard 进行混淆之前，该应用程序运行完美。
谁能帮我解决这个问题？

Answer 1

将以下内容添加到您的 Proguard.config。它将帮助您定位问题。

-verbose 
-dump class_files.txt 
-printseeds seeds.txt 
-printusage unused.txt 
-printmapping mapping.txt

I have the following in my proguard-project.txt file

我认为您应该使用 proguard-android-optimize.txt，而不是 proguard-android.txt。

为了完整起见，感谢 Riley Hassell Android Security Discussions的技巧。