javax.activation.UnsupportedDataTypeException：在尝试发送电子邮件时没有对象 DCH 用于 MIME 类型图像/png答案

【问题标题】：javax.activation.UnsupportedDataTypeException: no object DCH for MIME type image/png on trying to send emailjavax.activation.UnsupportedDataTypeException：在尝试发送电子邮件时没有对象 DCH 用于 MIME 类型图像/png
【发布时间】：2020-09-02 15:11:03
【问题描述】：

我将我的项目从 Java 8 更新到 14。我还在我的项目 pom.xml 中更新了一堆依赖项。现在，每当我尝试通过应用程序发送电子邮件时，我都会遇到问题。我尝试了许多在网上找到的不同解决方案，但似乎没有一个对我有用。这是错误日志：

javax.mail.MessagingException: IOException while sending message;
  nested exception is:
    javax.activation.UnsupportedDataTypeException: no object DCH for MIME type image/png
    at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1365)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:88)
    at 
    java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
    at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: javax.activation.UnsupportedDataTypeException: no object DCH for MIME type image/png
    at javax.activation.ObjectDataContentHandler.writeTo(DataHandler.java:885)
    at javax.activation.DataHandler.writeTo(DataHandler.java:316)
    at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1687)
    at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:991)
    at javax.mail.internet.MimeMultipart.writeTo(MimeMultipart.java:561)
    at com.sun.mail.handlers.multipart_mixed.writeTo(multipart_mixed.java:84)
    at javax.activation.ObjectDataContentHandler.writeTo(DataHandler.java:883)
    at javax.activation.DataHandler.writeTo(DataHandler.java:316)
    at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1687)
    at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1906)
    at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1315)
    ... 16 more
2020-09-02 17:00:03 INFO  EmailDirectSignOneTimeLogin:79 - direct sign url: http://localhost:3000/direct_sign/czDSIg3Fms
FINISHED JOB

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【问题讨论】：

标签： java email java-14

【解决方案1】：

这可能会使用有关您正在尝试做的事情的更多信息，但我在处理同一问题时碰巧发现了这个问题，并且还找到了this question 并获得了以下适用于 Java 11 的代码：

            part = new MimeBodyPart();
            ByteArrayDataSource source = new ByteArrayDataSource(logoBytes, "image/png");
            DataHandler handler = new DataHandler(source);
            part.setDataHandler(handler);
            part.setHeader("Content-ID", "<Logo>");
            multipart.addBodyPart(part);

【讨论】：