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.

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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.

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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.

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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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