java.lang.NoClassDefFoundError：解析失败：Ljavax/naming/ldap/LdapName

Question

我已经实施了 ProGuard 来切断不必要的代码。但是应用程序启动后，我收到以下错误 -

java.lang.NoClassDefFoundError: Failed resolution of: Ljavax/naming/ldap/LdapName;
 at b.a.b.e.d.a.b(Unknown Source)
 at b.a.b.e.d.a.a(Unknown Source)
 at b.a.b.e.d.a.a(Unknown Source)
 at b.a.b.e.d.a.a(Unknown Source)
 at b.a.b.e.d.f.a(Unknown Source)
 at b.a.b.e.d.f.a(Unknown Source)
 at b.a.b.e.d.f.a(Unknown Source)
 at b.a.b.h.c.h.a(Unknown Source)
 at b.a.b.h.c.p.a(Unknown Source)
 at b.a.b.h.b.o.a(Unknown Source)
 at b.a.b.h.b.o.a(Unknown Source)
 at b.a.b.h.b.a.a(Unknown Source)
 at b.a.b.h.b.h.a(Unknown Source)
 at b.a.b.h.b.h.a(Unknown Source)
 at b.a.b.h.b.h.execute(Unknown Source)
 at com.c.a.ae.a(Unknown Source)
 at com.c.a.b.a(Unknown Source)
 at com.c.a.aa.run(Unknown Source)
 at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.ClassNotFoundException: Didn't find class "javax.naming.ldap.LdapName" on path: DexPathList[[zip file "/data/app/bd.com.chalo-1/base.apk"],nativeLibraryDirectories=[/data/app/bd.com.chalo-1/lib/arm64, /data/app/bd.com.chalo-1/base.apk!/lib/arm64-v8a, /vendor/lib64, /system/lib64]]
 at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
 ... 19 more
 Suppressed: java.lang.ClassNotFoundException: javax.naming.ldap.LdapName
  at java.lang.Class.classForName(Native Method)
  at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
  at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
  ... 20 more
 Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available

我现在该怎么办？这和我的图书馆有关吗？

Answer 1

Android 的 ProGuard 文档是这样描述的：

“ProGuard 工具通过删除未使用的代码并使用语义模糊名称重命名类、字段和方法来缩小、优化和混淆您的代码。结果是一个更小尺寸的 .apk 文件，更难以逆向工程……。运行 ProGuard 是完全可选的，但强烈推荐。”

如果您的应用包含第三方库、广播接收器、自定义小部件等，现在添加 proguard 可能会导致问题。因此您需要添加 proguard 规则以在运行时添加这些类，否则这些类将无法在 APK 版本中编译，您将得到错误

有关proguard及其用法的详细信息，请参见此链接：http://omgitsmgp.com/2013/09/09/a-conservative-guide-to-proguard-for-android/

您可以使用一个标准的 proguard 规则表单：

# Add any project specific keep options here:

# If your project uses WebView with JS, uncomment the following
# and specify the fully qualified class name to the JavaScript interface
# class:
#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
#   public *;
#}

# Obfuscation parameters:
#-dontobfuscate
-useuniqueclassmembernames
-keepattributes SourceFile,LineNumberTable
-allowaccessmodification

# Ignore warnings:
#-dontwarn org.mockito.**
#-dontwarn org.junit.**
#-dontwarn com.robotium.**
#-dontwarn org.joda.convert.**

# Ignore warnings: We are not using DOM model
-dontwarn com.fasterxml.jackson.databind.ext.DOMSerializer
# Ignore warnings: https://github.com/square/okhttp/wiki/FAQs
-dontwarn com.squareup.okhttp.internal.huc.**
# Ignore warnings: https://github.com/square/okio/issues/60
-dontwarn okio.**
# Ignore warnings: https://github.com/square/retrofit/issues/435
-dontwarn com.google.appengine.api.urlfetch.**

# Keep the pojos used by GSON or Jackson
-keep class com.futurice.project.models.pojo.* { ; }

# Keep GSON stuff
-keep class sun.misc.Unsafe { *; }
-keep class com.google.gson.* { ; }

-keep public class Socket

# Keep Jackson stuff
-keep class org.codehaus.* { ; }
-keep class com.fasterxml.jackson.annotation.* { ; }

# Keep these for GSON and Jackson
-keepattributes Signature
-keepattributes Annotation
-keepattributes EnclosingMethod

# Keep Retrofit
-keep class retrofit.* { ; }
-keepclasseswithmembers class * {
    @retrofit.** *;
}
-keepclassmembers class * {
    @retrofit.** *;
}
-keep public class com.mikhaellopez:circularimageview:2.1.1.* { ; }
# Keep Picasso
-keep class com.squareup.picasso.* { ; }
-keepclasseswithmembers class * {
    @com.squareup.picasso.** *;
}
-keepclassmembers class * {
    @com.squareup.picasso.** *;
}

在您的 proguard 文件中添加此规则... 标准表格详情见：https://github.com/futurice/android-best-practices/blob/master/templates/rx-architecture/app/proguard-rules.pro

还有这个： https://gist.github.com/Jackgris/c4a71328b1ae346cba04