TOMCAT支持J2EE版本问题
j2ee1.4 支持的是servlet2.4,jsp2.0,ejb2.1,等等j2ee5.0 支持的是servlet2.5,jsp2.1,ejb3.0,等等.
Tomcat5实现了Servlet2.4和JSP2.0，所以在tomcat5下运行的web工程，最好是选择j2ee1.4,如果要选择j2ee5.0，需要手动拷贝j2ee5.0的jar.
Apache Tomcat version 5.5 implements the Servlet 2.4 and JavaServer Pages 2.0 specifications from the Java Community Process, and includes many additional features that make it a useful platform for developing and deploying web applications and web services.
Tomcat6实现了Servlet2.5和JSP2.1，所以他支持J2EE5.0,不需要手动拷贝包，由于J2EE规范是向前兼容的，所以他也支持j2ee1.4
Apache Tomcat version 6.0 implements the Servlet 2.5 and JavaServer Pages 2.1 specifications from the Java Community Process, and includes many additional features that make it a useful platform for developing and deploying web applications and web services.
project的.setting folder下面，有个名为org.eclipse.wst.common.project.facet.core.xml的文件，里面配置有各种版本信息,如果配置的不对，可能会报
tomcat x.x does not support version x.x of J2EE specification.....。
<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>
<installed facet="jst.java" version="5.0"/>
<installed facet="jst.web" version="2.4"/>
</faceted-project>
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