Session.getInstance 的 Java 邮件问题
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原文地址: http://stackoverflow.com/questions/24807472/
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StackOverFlow
Java Mail Issue with Session.getInstance
提问by Biscuit128
I am receiving the following exception when trying to use java mail;
我在尝试使用 java 邮件时收到以下异常；
java.lang.NoClassDefFoundError: com/sun/mail/util/MailLogger
at javax.mail.Session.initLogger(Session.java:226)
at javax.mail.Session.<init>(Session.java:210)
at javax.mail.Session.getInstance(Session.java:247)
at com.secondstory.mailsender.MailSender.createSmtpSession(MailSender.java:67)
at com.secondstory.mailsender.MailSender.sendSimpleMessage(MailSender.java:38)
at com.secondstory.mailsender.MailSender.generateLostPasswordEmail(MailSender.java:79)
at com.secondstory.mailsender.MailSenderTest.shouldReturnTrueWithCredentialsSet(MailSenderTest.java:49)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.junit.runners.model.FrameworkMethod.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access<dependency>
<groupId>javax.mail</groupId>
<artifactId>javax.mail-api</artifactId>
<version>1.5.2</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>javax.activation</groupId>
<artifactId>activation</artifactId>
<version>1.1.1</version>
</dependency>
0(ParentRunner.java:53)
at org.junit.runners.ParentRunner.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.ClassNotFoundException: com.sun.mail.util.MailLogger
at java.net.URLClassLoader.run(URLClassLoader.java:366)
at java.net.URLClassLoader.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 30 more
After searching stack overflow extensively (maybe not extensively enough - lets see!) I have found that we need two jars inside our maven pom for this too work. The two dependancies I have are as follows;
在广泛搜索堆栈溢出后（可能不够广泛 - 让我们看看！）我发现我们的 maven pom 中也需要两个 jar 来完成这项工作。我的两个依赖如下；
private static Session createSmtpSession() {
final Properties props = new Properties();
props.setProperty("mail.host", "host");
props.setProperty("mail.smtp.auth", "true");
props.setProperty("mail.smtp.starttls.enable", "true");
props.setProperty("mail.transport.protocol", "smtp");
//props.setProperty("mail.debug", "true");
return Session.getInstance(props, new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(
"username", "password");
}
});
}
Something has changed but I am not entirely sure what it is - as this worked previously. The code i have written where this element fails is as follows;
有些事情发生了变化，但我不完全确定它是什么 - 因为这以前有效。我在此元素失败的地方编写的代码如下；
<dependency>
<groupId>com.sun.mail</groupId>
<artifactId>javax.mail</artifactId>
<version>1.5.2</version>
</dependency>
Am I missing some config or should this work with the current setup that I have?
我是否缺少一些配置，或者这应该与我拥有的当前设置一起使用吗？
Thanks
谢谢
采纳答案by Magic Wand
Try adding this into Maven POM:
尝试将其添加到 Maven POM 中：
<dependency>
<groupId>com.sun.mail</groupId>
<artifactId>javax.mail</artifactId>
<version>1.6.1</version>
</dependency>
回答by Mark Rotteveel
The problem is that you are trying to use javax.mail-api.jar. That is the wrong library. JavaMail is a Java EE specification, the interfaces of that specification are published in that javax.mail-api-1.6.1.jar, which only works when compiling. It doesn't provide an implementation of the specification, so it doesn't work at runtime.
问题是您正在尝试使用javax.mail-api.jar. 那是错误的库。JavaMail 是一个 Java EE 规范，该规范的接口发布在 that 中javax.mail-api-1.6.1.jar，仅在编译时有效。它不提供规范的实现，因此它在运行时不起作用。
You need to use an implementation of the JavaMail specification at runtime. You can find the reference implementation on https://javaee.github.io/javamail/(but there are others, for example Java EE application servers usually include one).
您需要在运行时使用 JavaMail 规范的实现。您可以在https://javaee.github.io/javamail/上找到参考实现（但还有其他实现，例如 Java EE 应用服务器通常包含一个）。
For javax.mail-api.jar, https://javaee.github.io/javamail/says:
对于javax.mail-api.jar，https: //javaee.github.io/javamail/说：
The JavaMail API definitions only, suitable for compiling against; use only with a Maven “provided” dependency scope
仅 JavaMail API 定义，适合编译；仅与 Maven“提供的”依赖范围一起使用
Specifically in your case you need either javax.mail.jaror mailapi.jar+ the jars of the specific protocols you want to use. For example mailapi.jar+ smtp.jarif you only need smtp(s) support.
特别是在您的情况下，您需要javax.mail.jar或mailapi.jar+ 要使用的特定协议的罐子。例如mailapi.jar+smtp.jar如果您只需要 smtp(s) 支持。
With Maven, you can use
使用 Maven，您可以使用
##代码##