在android中运行proguard时Jackson.jar出错

Question

我有一个使用jackson-all-1.7.2.jar 的android 项目。

当我使用这个 proguard.cfg 文件运行 proguard 时：

-keep class com.actionbarsherlock.** {*;}
-keep class org.holoeverywhere.** {*;}

-libraryjars /libs/jackson-all-1.7.2.jar

我遇到了这个异常：

[2013-06-15 06:06:04 - ArrowAndroid] Proguard returned with error code 1. See console
[2013-06-15 06:06:04 - ArrowAndroid] Note: there were 600 duplicate class definitions.
[2013-06-15 06:06:04 - ArrowAndroid] Warning: org.codehaus.jackson.jaxrs.JacksonJsonProvider: can't find superclass or interface javax.ws.rs.ext.MessageBodyReader
[2013-06-15 06:06:04 - ArrowAndroid] Warning: org.codehaus.jackson.jaxrs.JacksonJsonProvider: can't find superclass or interface javax.ws.rs.ext.MessageBodyWriter
[2013-06-15 06:06:04 - ArrowAndroid] Warning: org.codehaus.jackson.jaxrs.JsonMappingExceptionMapper: can't find superclass or interface javax.ws.rs.ext.ExceptionMapper
[2013-06-15 06:06:04 - ArrowAndroid] Warning: org.codehaus.jackson.jaxrs.JsonParseExceptionMapper: can't find superclass or interface javax.ws.rs.ext.ExceptionMapper
[2013-06-15 06:06:04 - ArrowAndroid] Warning: org.codehaus.jackson.xc.DataHandlerJsonDeserializer$1: can't find superclass or interface javax.activation.DataSource
[2013-06-15 06:06:04 - ArrowAndroid] Warning: org.codehaus.jackson.jaxrs.JacksonJaxbJsonProvider: can't find referenced class javax.ws.rs.ext.Provider
[2013-06-15 06:06:04 - ArrowAndroid] Warning: org.codehaus.jackson.jaxrs.JacksonJaxbJsonProvider: can't find referenced class javax.ws.rs.Consumes
[2013-06-15 06:06:04 - ArrowAndroid] Warning: org.codehaus.jackson.jaxrs.JacksonJaxbJsonProvider: can't find referenced class javax.ws.rs.Produces
[2013-06-15 06:06:04 - ArrowAndroid] Warning: org.codehaus.jackson.jaxrs.JacksonJsonProvider: can't find referenced class javax.ws.rs.core.MediaType
[2013-06-15 06:06:04 - ArrowAndroid] Warning: org.codehaus.jackson.jaxrs.JacksonJsonProvider: can't find referenced class javax.ws.rs.ext.Providers
[2013-06-15 06:06:04 - ArrowAndroid] Warning: org.codehaus.jackson.jaxrs.JacksonJsonProvider: can't find referenced class javax.ws.rs.ext.ContextResolver
[2013-06-15 06:06:04 - ArrowAndroid] Warning: org.codehaus.jackson.jaxrs.JacksonJsonProvider: can't find referenced class javax.ws.rs.core.StreamingOutput
[2013-06-15 06:06:04 - ArrowAndroid] Warning: org.codehaus.jackson.jaxrs.JacksonJsonProvider: can't find referenced class javax.ws.rs.core.Response
[2013-06-15 06:06:04 - ArrowAndroid] Warning: org.codehaus.jackson.jaxrs.JacksonJsonProvider: can't find referenced class javax.ws.rs.ext.MessageBodyReader
[2013-06-15 06:06:04 - ArrowAndroid] Warning: org.codehaus.jackson.jaxrs.JacksonJsonProvider: can't find referenced class javax.ws.rs.ext.MessageBodyWriter
[2013-06-15 06:06:04 - ArrowAndroid] Warning: org.codehaus.jackson.jaxrs.JacksonJsonProvider: can't find referenced class javax.ws.rs.core.MediaType
[2013-06-15 06:06:04 - ArrowAndroid] Warning: org.codehaus.jackson.jaxrs.JacksonJsonProvider: can't find referenced class javax.ws.rs.ext.Providers
.....
.....
.....
[2013-06-15 06:06:04 - ArrowAndroid]       You should check if you need to specify additional program jars.
[2013-06-15 06:06:04 - ArrowAndroid] Warning: there were 387 unresolved references to classes or interfaces.
[2013-06-15 06:06:04 - ArrowAndroid]          You may need to specify additional library jars (using '-libraryjars').
[2013-06-15 06:06:04 - ArrowAndroid] java.io.IOException: Please correct the above warnings first.
[2013-06-15 06:06:04 - ArrowAndroid]    at proguard.Initializer.execute(Initializer.java:321)
[2013-06-15 06:06:04 - ArrowAndroid]    at proguard.ProGuard.initialize(ProGuard.java:211)
[2013-06-15 06:06:04 - ArrowAndroid]    at proguard.ProGuard.execute(ProGuard.java:86)
[2013-06-15 06:06:04 - ArrowAndroid]    at proguard.ProGuard.main(ProGuard.java:492)

注意，应用程序在没有 proguard 的情况下运行完美。

当我在 proguard.cfg 中添加以下行时 -dontwarn org.codehaus.jackson

应用程序崩溃并报告此异常：

Caused by: java.lang.ExceptionInInitializerError
    at org.codehaus.jackson.map.ObjectMapper.<clinit>(Unknown Source)
    ... 15 more
 Caused by: java.lang.NoSuchFieldError: PUBLIC_ONLY
    at java.lang.Class.getDeclaredAnnotation(Native Method)
    at java.lang.Class.getAnnotation(Class.java:260)
    at org.codehaus.jackson.map.introspect.VisibilityChecker$Std.<clinit>(Unknown Source)
    ... 16 more

Answer 1

文件 jackson-all-1.7.2.jar 已经在您的 libs 目录中，因此 Android Ant/Eclipse 构建将自动拾取它。您不应该使用 -libraryjars 再次阅读它，因为那样您会收到这些关于重复的警告。

Jackson 正在使用反射来查找一些注释。 ProGuard 无法自动推断出这一点，它最终会删除相关的、看似未使用的字段。此配置应保留它们：

-keepclassmembers public final enum org.codehaus.jackson.annotate.JsonAutoDetect$Visibility {
    public static final org.codehaus.jackson.annotate.JsonAutoDetect$Visibility *;
}

Answer 2

在你的 proguard 配置文件中添加这些行。

-keepnames class com.fasterxml.jackson.** { 
*; 
}
-keepnames interface com.fasterxml.jackson.** { 
    *; 
}