英文:
Error: Unable to initialize main class AirMail Caused by: java.lang.NoClassDefFoundError: javax/mail/Authenticator
问题
我正在创建一个使用Swing、AWT和邮件API的Java应用程序，它的名字是AirMail。它具有发送电子邮件的功能，包括附加文件的功能，该电子邮件服务由Gmail（谷歌）提供。
我已经在命令行上使用jar -cvmf manifest.mf AirMail.jar命令创建了它的jar文件。因此，当我启动jar文件时，出现了一个错误。
错误信息：
无法初始化主类 AirMail Caused by: java.lang.NoClassDefFoundError: javax/mail/Authenticator
正如上面的错误所说，在javax/mail/Authenticator中出现了NoClassDefFoundError。我检查了Mail API中是否存在javax/mail/Authenticator类，是的，它存在。
通常，我们需要在manifest.mf文件中提供Main-Class的值，我已经检查了我的Manifest.mf文件，并在其中添加了Main-Class的值，此外我在Manifest.mf文件的末尾已经留了一行空白行。
Manifest.mf文件的内容
- Manifest-Version: 1.0
- Created-By: 11.0.7 (Oracle Corporation)
- Main-Class: AirMail
我提供了一个链接，链接到我的AirMail.java代码。
https://github.com/thesumitsuryawanshi/Air-Mail/blob/master/AirMail.java
我正在使用Ubuntu 18.04 64位操作系统。
任何帮助！或者关于我的问题的额外知识将不胜感激！谢谢！
英文:
I am creating a Java Application with Swing , AWT and Mail API whose name is AirMail.
Which Sends Email with a featuer of attaching file and this email service is provided by Gmail (Google).
I have created its jar file on command line by jar -cvmf manifest.mf AirMail.jar command .
So , I'm getting an error when I, launch jar file.
Error :
Unable to initialize main class AirMail Caused by: java.lang.NoClassDefFoundError: javax/mail/Authenticator
As, above error says NoClassDefFoundError in javax/mail/Authenticator .
I check out , javax/mail/Authenticator class is present or not in the Mail API.
and , Yes It is Present.
Usually, we need to provide Main-Class value in manifest.mf file and I have checked my Manifest.mf file and added its Main-Class value along with this Ive already left a blank line at the end of Manifest.mf file.
Content of Manifest.mf file
- Manifest-Version: 1.0
- Created-By: 11.0.7 (Oracle Corporation)
- Main-Class: AirMail
I'm Providing a link to my AirMail.java code.
https://github.com/thesumitsuryawanshi/Air-Mail/blob/master/AirMail.java
I'm using Ubuntu 18.04 "64-bit"
Any Help !!
or
Extra Knowledge about my question would be appreciated.!!
Thank you !!
答案1
得分: 1
据我所知，javax.mail包似乎不包含在Java 11中。您需要将其作为项目的依赖项添加。
对于Maven项目，可以尝试以下配置：
<!-- https://mvnrepository.com/artifact/com.sun.mail/javax.mail -->
<dependency>
<groupId>com.sun.mail</groupId>
<artifactId>javax.mail</artifactId>
<version>1.6.2</version>
</dependency>
英文:
AFIK javax.mail package is not part of Java 11. you need to add this as a dependency to your project.
for maven this could work
<!-- https://mvnrepository.com/artifact/com.sun.mail/javax.mail -->
<dependency>
<groupId>com.sun.mail</groupId>
<artifactId>javax.mail</artifactId>
<version>1.6.2</version>
</dependency>
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