项目添加Maven支持后，运行JUnit单元测试，出现一下错误：

ERROR in ch.qos.logback.core.joran.action.AppenderAction - Could not create an Appender of type
[com.travelsky.tdp.pkgStock.integration.logback.appender.mail.SMTPAppender]. ch.qos.logback.core.util.DynamicClassLoadingException: Failed to instantiate type

com.travelsky.tdp.pkgStock.integration.logback.appender.mail.SMTPAppender
 at ch.qos.logback.core.util.DynamicClassLoadingException: Failed to instantiate type com.travelsky.tdp.pkgStock.integration.logback.appender.mail.SMTPAppender
 at  at ch.qos.logback.core.util.OptionHelper.instantiateByClassName(OptionHelper.java:54)
 at  ......(省略打印信息)
 at  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/mail/internet/AddressException
 at  at java.lang.ClassLoader.defineClass1(Native Method)
 at  .....(省略打印信息)
 at  ... 41 common frames omitted

ERROR in ch.qos.logback.core.joran.spi.Interpreter@192:115 - ActionException in Action for tag [appender] ch.qos.logback.core.joran.spi.ActionException:

ch.qos.logback.core.util.DynamicClassLoadingException: Failed to instantiate type com.travelsky.tdp.pkgStock.integration.logback.appender.mail.SMTPAppender
 at ch.qos.logback.core.joran.spi.ActionException: ch.qos.logback.core.util.DynamicClassLoadingException: Failed to instantiate type

com.travelsky.tdp.pkgStock.integration.logback.appender.mail.SMTPAppender
 at  at ch.qos.logback.core.joran.action.AppenderAction.begin(AppenderAction.java:82)
 at  ......(省略打印信息)
 at  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: ch.qos.logback.core.util.DynamicClassLoadingException: Failed to instantiate type com.travelsky.tdp.pkgStock.integration.logback.appender.mail.SMTPAppender
 at  at ch.qos.logback.core.util.OptionHelper.instantiateByClassName(OptionHelper.java:54)
 at  ... 39 common frames omitted
Caused by: java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file <SPAN style="COLOR: #ff0000"><STRONG>javax/mail/internet/<SPAN style="COLOR: #ff0000">Ad</SPAN>dressException</STRONG></SPAN>
 at  at java.lang.ClassLoader.defineClass1(Native Method)
 at  .....(省略打印信息)
 at  ... 41 common frames omitted

　　单元测试失败，查找原因，发现如下问题：

　　1、Maven依赖中使用的 javeee.jar 版本较高，里面包含了 mail相关的接口，和 mail.jar 相冲突；

　　2、javaee.jar 中包含了 mail相关接口的 实现类；

　　3、MyEclipse自带的javaee.jar 版本和 MyEclipse本身的版本有关：MyEclipse6.5自带的javaee.jar 中不包含mail相关的接口，而MyEclipse8.0自带的javaee.jar中包含了mail相关的接口，同时包含了接口的实现；

　　4、项目中直接用到了mail.jar中的类和方法；

　　此bug出现的原因是由于类冲突，因此去掉冲突的类即可；但是应该怎么选择呢？