javax.mail.nosuchprovider 异常 smtp

Question

我正在使用以下代码在我的 Android 应用程序中发送电子邮件：

    m_properties = new Properties();
    m_properties.put("mail.smtp.host", "smtp.gmail.com");
    m_properties.put("mail.smtp.socketFactory.port", "465");
    m_properties.put("mail.smtp.socketFactory.class",
                    "javax.net.ssl.SSLSocketFactory");
    m_properties.put("mail.smtp.auth", "true");
    m_properties.put("mail.smtp.port", "465");

    m_Session = Session.getDefaultInstance(m_properties,
                    new Authenticator() {
                        protected PasswordAuthentication getPasswordAuthentication() {
                            return new PasswordAuthentication(userName,
                                    passWord);
                        }

                    });

    m_simpleMessage = new MimeMessage(m_Session);

    m_fromAddress = new InternetAddress(userName);
    m_toAddress = new InternetAddress(eRecipient);

    m_simpleMessage.setFrom(m_fromAddress);
    m_simpleMessage.setRecipient(RecipientType.TO, m_toAddress);
    m_simpleMessage.setSubject(eSubject);
    m_simpleMessage.setContent(eBody, "text/plain");

    Transport.send(m_simpleMessage);

在我混淆我的代码之前，它绝对可以正常工作。然后电子邮件发送失败，抛出错误：javax.mail.nosuchproviderexception smtp

我在我的 proguard.cfg 中尝试了各种设置，例如：-keep class javax.mail.** { *; }

但是没有任何效果。如果我关闭混淆，它会再次正常工作。

任何想法为什么会发生这种情况？

提前致谢。

编辑：我的 Proguard 配置文件

-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontskipnonpubliclibraryclassmembers
-verbose


-libraryjars "C:\Program Files\Android\android-sdk\platforms\android-15\android.jar"
-libraryjars "C:\Documents and Settingslibs\commons-io-2.4.jar"
-libraryjars "C:\Documents and Settings\libs\mail.jar"
-libraryjars "C:\Documents and Settingslibs\activation.jar"
-libraryjars "C:\Documents and Settings\libs\additionnal.jar"
-libraryjars "C:\Documents and Settings\libs\dropbox-android-sdk-1.3.1.jar"
-libraryjars "C:\Documents and Settings\libs\microsoft-translator-java-api-0.6.1-jar-with-dependencies.jar"
-libraryjars "C:\Documents and Settings\pingpongboss-StandOut-5c5cbe9\library\bin\standout.jar"
-libraryjars "C:\Documents and Settings\android-uitableview\android-uitableview\bin\br_com_dina_ui.jar"

-dontpreverify


!code/simplification/arithmetic,!code/simplification/cast,!field/*,!class/merging/*
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*
-optimizationpasses 5
-allowaccessmodification

-keep public class * extends android.app.Activity
-keep public class * extends android.app.Application
-keep public class * extends android.app.Service
-keep public class com.android.vending.licensing.ILicensingService

-keep public class * extends android.view.View {
    public <init>(android.content.Context);
    public <init>(android.content.Context, android.util.AttributeSet);
    public <init>(android.content.Context, android.util.AttributeSet, int);
    public void set*(...);
}


-keepclassmembers class * extends android.app.Activity {
   public void *(android.view.View);
}


-keepclassmembers enum * {
    public static **[] values();
    public static ** valueOf(java.lang.String);
}

-keep public class com.winterwell.jgeoplanet.** {
  public protected *;
}

-keep public class winterwell.jwitter.** {
  public protected *;
}

-keep public class winterwell.json.** {
  public protected *;
}

-keep class com.winterwell.** { *; }

-keep class winterwell.** { *; }

-keep class com.faceture.google.** { *; }
-keep class com.faceture.google.play.** { *; }
-keep class com.faceture.google.play.domain.** { *; }
-keep class com.faceture.http.** { *; }
-keep class com.faceture.rest.** { *; }
-keep class com.faceture.google.gson.** { *; }
-keep class com.google.gson.** { *; }


-dontwarn android.support.**
-dontwarn org.apache.commons.codec.binary.**
-dontwarn org.apache.harmony.awt.**
-dontwarn javax.activation.**
-dontwarn com.sun.mail.imap.protocol.**

-keepattributes Signature

-keepattributes *Annotation*


-keep class sun.misc.Unsafe { *; }

-keep class com.google.gson.examples.android.model.** { *; }

---

由于这些错误，上述警告已被删除：

Warning: javax.activation.CommandInfo: can't find referenced class java.beans.Beans
Warning: com.sun.mail.imap.protocol.IMAPSaslAuthenticator: can't find referenced class javax.security.sasl.Sasl
+ can't find referenced class javax.security.sasl.SaslClient
+ can't find referenced class javax.security.sasl.SaslException
+ can't find referenced class javax.security.auth.callback.NameCallback
+ can't find referenced class javax.security.sasl.RealmCallback

Answer 1

我通过包含下面详述的附加 Proguard 配置解决了这个问题。我从this answer 获得了解决方案，其中包含更多信息。

-keep class javamail.** {*;}
-keep class javax.mail.** {*;}
-keep class javax.activation.** {*;}

-keep class com.sun.mail.dsn.** {*;}
-keep class com.sun.mail.handlers.** {*;}
-keep class com.sun.mail.smtp.** {*;}
-keep class com.sun.mail.util.** {*;}
-keep class mailcap.** {*;}
-keep class mimetypes.** {*;}
-keep class myjava.awt.datatransfer.** {*;}
-keep class org.apache.harmony.awt.** {*;}
-keep class org.apache.harmony.misc.** {*;}

Answer 2

我不知道 Proguard 是什么，但它听起来像是从 mail.jar 中提取类文件并将它们添加到您的 jar 中。不幸的是，它不包括 mail.jar 文件中的配置文件。您需要 mail.jar 文件中 META-INF 中的文件。或者更好的是，不要重新打包 mail.jar，直接使用它。

Answer 3

这个错误通常是因为“mail.jar”不正确造成的。

解决方案：

1] 检查“mail.jar”是否在您的类路径中。

2] 如果它在类路径中，检查“mail.jar”的最新版本，然后 将其包含在您的类路径中。

您可以查看和下载最新版本，

http://www.oracle.com/technetwork/java/index-138643.html