本文介绍了NoClassDefFound 错误的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
java.lang.NoClassDefFoundError: javax/mail/Authenticator
我已将激活器和邮件 jar 添加到我的 server/deps 目录中，但仍然遇到此问题，我不知道为什么.
I have added the activator and mail jars to my server/deps directory, and am still encountering this problem and I don't know why.
推荐答案
请记住 NoClassDefFoundError 与 ClassNotFoundException 不同.NoClassDefFoundError 意味着在编译时在类路径中可用的类在运行时不可用.您确定您的 jar 文件在 runtime 类路径中吗?
Keep in mind NoClassDefFoundError isn't the same as ClassNotFoundException. NoClassDefFoundError means that a class that was available in the classpath at compile time isn't available at runtime. Are you sure your jar files are in the runtime classpath?
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