启用断言时，JavaMail 1.4 总是抛出 AssertionError (-ea)

Question

使用旧版本的 JavaMail 1.4 时，启用 JVM 运行断言 -ea，JavaMail 总是在连接到 SMTP 服务器时抛出 AssertionError：

Caused by: java.lang.AssertionError
at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:1578)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1369)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:412)
at javax.mail.Service.connect(Service.java:251)

AssertionError 完全出乎意料，我希望连接能够正常工作，并且在没有启用 JVM 断言的情况下也能正常工作。

除了放弃运行个断言之外，还有什么办法可以解决这个错误吗？

Answer 1

您需要升级到更新的或最新的 JavaMail。这看起来像是一个旧错误，此错误已在 JavaMail 参考实现中修复，修复 post 版本 1.4.

正在审核 SMTPTransport source code , it performs a lot of assertions checking that the code is holding the current monitor/lock on itself. One of the methods was missing the synchronized keyword, making this untrue, resulting in an AssertionError, but only if assertions are explicitly enabled. It looks like the method missing the synchronization block was fixed in this revision。

最简单的做法是升级到更新的 JavaMail，或者禁用断言。

另见 JIRA knowledge base。

启用断言时，JavaMail 1.4 总是抛出 AssertionError (-ea)

JavaMail 1.4 always throws AssertionError when assertions are enabled (-ea)

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