我正试图从自己（gmail帐户）向自己发送一封电子邮件。
我使用了以下代码来做这件事：
private static void sendFromGMail(String from, String pass, String[] to,
String subject, String body) {
Properties props = System.getProperties();
String host = "smtp.gmail.com";
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.host", host);
props.put("mail.smtp.user", from);
props.put("mail.smtp.password", pass);
props.put("mail.smtp.port", "587");
props.put("mail.smtp.auth", "true");
Session session = Session.getDefaultInstance(props);
MimeMessage message = new MimeMessage(session);
try {
message.setFrom(new InternetAddress(from));
InternetAddress[] toAddress = new InternetAddress[to.length];
// To get the array of addresses
for (int i = 0; i < to.length; i++) {
toAddress[i] = new InternetAddress(to[i]);
}
for (int i = 0; i < toAddress.length; i++) {
message.addRecipient(Message.RecipientType.TO, toAddress[i]);
}
message.setSubject(subject);
message.setText(body);
Transport transport = session.getTransport("smtp");
transport.connect(host, from, pass);
transport.sendMessage(message, message.getAllRecipients());
transport.close();
} catch (AddressException ae) {
ae.printStackTrace();
} catch (MessagingException me) {
me.printStackTrace();
}
}
当我把它作为一个java应用程序运行时，一切都很好，邮件也被发送了。但是，当我尝试运行tomcat apache服务器时，它根本无法启动。当我把代码放在注释中时，服务器又开始运行了。
为什么会发生这种事？有人能帮我用tomcat发这封电子邮件吗？
非常感谢！
=====================编辑：=====================
当代码处于注释中，并且服务器开始运行时，控制台消息为：
יונ 25, 2015 2:49:21 AM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:Program FilesJavajre8bin;C:WindowsSunJavabin;C:Windowssystem32;C:Windows;C:MinGWbin; C:MinGWmsys1.0bin; C:Program Files (x86)InteliCLS Client;C:Program FilesInteliCLS Client;C:Program Files (x86)NVIDIA CorporationPhysXCommon;C:Program FilesCommon FilesMicrosoft SharedWindows Live;C:Program Files (x86)Common FilesMicrosoft SharedWindows Live;C:Windowssystem32;C:Windows;C:WindowsSystem32Wbem;C:WindowsSystem32WindowsPowerShellv1.0;C:Program Files (x86)Windows LiveShared;C:Program Files (x86)IntelOpenCL SDK2.0binx86;C:Program Files (x86)IntelOpenCL SDK2.0binx64;C:Program FilesIntelIntel(R) Management Engine ComponentsDAL;C:Program FilesIntelIntel(R) Management Engine ComponentsIPT;C:Program Files (x86)IntelIntel(R) Management Engine ComponentsDAL;C:Program Files (x86)IntelIntel(R) Management Engine ComponentsIPT;C:Program FilesIntelWiFibin;C:Program FilesCommon FilesIntelWirelessCommon;C:Program FilesDiskeeper CorporationExpressCache;;C:TDM-GCC-64bin;C:Program Files (x86)SkypePhone;C:MinGWbin; C:MinGWmsys1.0bin; C:Program Files (x86)SSH Communications SecuritySSH Secure Shell;;.
יונ 25, 2015 2:49:22 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:DolphinsTagWebsite' did not find a matching property.
יונ 25, 2015 2:49:22 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context/Loader} Setting property 'useSystemClassLoaderAsParent' to 'false' did not find a matching property.
יונ 25, 2015 2:49:22 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:CrowdsourcingApplication' did not find a matching property.
יונ 25, 2015 2:49:22 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context/Loader} Setting property 'useSystemClassLoaderAsParent' to 'false' did not find a matching property.
יונ 25, 2015 2:49:23 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:FairPlay' did not find a matching property.
יונ 25, 2015 2:49:23 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context/Loader} Setting property 'useSystemClassLoaderAsParent' to 'false' did not find a matching property.
יונ 25, 2015 2:49:23 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-80"]
יונ 25, 2015 2:49:23 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
יונ 25, 2015 2:49:23 AM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 3087 ms
יונ 25, 2015 2:49:23 AM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
יונ 25, 2015 2:49:23 AM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.34
在代码没有注释之后，服务器说："以localhost启动tomcat7.0服务器"遇到了问题。localhost上的服务器Tomcat v7.0无法在90秒内启动。如果服务器需要更多时间，请尝试在服务器编辑器中增加超时时间。
控制台消息为：
יונ 25, 2015 2:40:32 AM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:Program FilesJavajre8bin;C:WindowsSunJavabin;C:Windowssystem32;C:Windows;C:MinGWbin; C:MinGWmsys1.0bin; C:Program Files (x86)InteliCLS Client;C:Program FilesInteliCLS Client;C:Program Files (x86)NVIDIA CorporationPhysXCommon;C:Program FilesCommon FilesMicrosoft SharedWindows Live;C:Program Files (x86)Common FilesMicrosoft SharedWindows Live;C:Windowssystem32;C:Windows;C:WindowsSystem32Wbem;C:WindowsSystem32WindowsPowerShellv1.0;C:Program Files (x86)Windows LiveShared;C:Program Files (x86)IntelOpenCL SDK2.0binx86;C:Program Files (x86)IntelOpenCL SDK2.0binx64;C:Program FilesIntelIntel(R) Management Engine ComponentsDAL;C:Program FilesIntelIntel(R) Management Engine ComponentsIPT;C:Program Files (x86)IntelIntel(R) Management Engine ComponentsDAL;C:Program Files (x86)IntelIntel(R) Management Engine ComponentsIPT;C:Program FilesIntelWiFibin;C:Program FilesCommon FilesIntelWirelessCommon;C:Program FilesDiskeeper CorporationExpressCache;;C:TDM-GCC-64bin;C:Program Files (x86)SkypePhone;C:MinGWbin; C:MinGWmsys1.0bin; C:Program Files (x86)SSH Communications SecuritySSH Secure Shell;;.
יונ 25, 2015 2:40:32 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:DolphinsTagWebsite' did not find a matching property.
יונ 25, 2015 2:40:33 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context/Loader} Setting property 'useSystemClassLoaderAsParent' to 'false' did not find a matching property.
יונ 25, 2015 2:40:33 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:CrowdsourcingApplication' did not find a matching property.
יונ 25, 2015 2:40:33 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context/Loader} Setting property 'useSystemClassLoaderAsParent' to 'false' did not find a matching property.
יונ 25, 2015 2:40:33 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:FairPlay' did not find a matching property.
יונ 25, 2015 2:40:33 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context/Loader} Setting property 'useSystemClassLoaderAsParent' to 'false' did not find a matching property.
יונ 25, 2015 2:40:34 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-80"]
יונ 25, 2015 2:40:34 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
יונ 25, 2015 2:40:34 AM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 3617 ms
יונ 25, 2015 2:40:34 AM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
יונ 25, 2015 2:40:34 AM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.34
יונ 25, 2015 2:40:38 AM org.apache.catalina.util.SessionIdGenerator createSecureRandom
INFO: Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [542] milliseconds.
יונ 25, 2015 2:40:48 AM org.apache.catalina.core.ContainerBase startInternal
SEVERE: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/FairPlay]]
at java.util.concurrent.FutureTask.report(Unknown Source)
at java.util.concurrent.FutureTask.get(Unknown Source)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/FairPlay]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
... 6 more
Caused by: java.lang.NoClassDefFoundError: javax/mail/internet/AddressException
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Unknown Source)
at java.lang.Class.getDeclaredFields(Unknown Source)
at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:87)
at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:261)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:140)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:67)
at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:405)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:881)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:369)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5173)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 6 more
Caused by: java.lang.ClassNotFoundException: javax.mail.internet.AddressException
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
... 20 more
יונ 25, 2015 2:40:48 AM org.apache.catalina.core.ContainerBase startInternal
SEVERE: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]
at java.util.concurrent.FutureTask.report(Unknown Source)
at java.util.concurrent.FutureTask.get(Unknown Source)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:302)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:732)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.startup.Catalina.start(Catalina.java:684)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:451)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1131)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 6 more
יונ 25, 2015 2:40:48 AM org.apache.catalina.startup.Catalina start
SEVERE: Catalina.start:
org.apache.catalina.LifecycleException: Failed to start component [StandardServer[8005]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.startup.Catalina.start(Catalina.java:684)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:451)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardService[Catalina]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:732)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 7 more
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 9 more
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1131)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:302)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 11 more
יונ 25, 2015 2:40:48 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 13858 ms
请帮忙！！！！
在我看来，这就像是一个jar冲突问题，因为所需的类定义没有被链接。
好的，所以问题解决了。。我把jar文件放在Webcontent/Web-inf/libs文件夹中，tomcat就可以运行它了！！（以前，jar文件位于我的项目根目录中的libs文件夹中）。非常感谢您的帮助：）！