tomcat6异常:Only a type can be imported解决方法
2010-09-07 13:33
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这次项目开发,运行环境的tomcat版本从5.5.12升级到了6.0.18,发现以前的项目不能跑了,访问一个很简单的jsp也会报错,说无法编译,报的错误就是:Only a type can be imported. com.xxx.xxx.XXX resolves to a package,意思就是说你jsp页面上引用的那个类不存在,可是在老版本明明跑的好好的,而且另一个现象就是项目根目录下的jsp访问没有问题,子目录下就报错,google了一下,发现这是新版本tomcat的一个变化,就是如果不指定context的话,每一个子文件夹都会被tomcat当作一个独立的虚拟应用的,所以每个子文件夹下的jsp页面访问的时候,都会在它的同一层找WEB-INF里面的class,这样当然找不到了,只有刚巧放在根目录下的jsp文件能访问。 解决办法:其实这也是自己以前写tomcat的配置文件时候,写法不规范造成的,以前的server.xml里面host信息代码如下: <Host name="www.local.com" appBase="D://projects//myWebSite//WebContent" unpackWARs="true" autoDeploy="true" xmlValidation="false" xmlNamespaceAware="false"> <Alias>192.168.1.43</Alias> <Context path="" docBase="" reloadable="true"> <Logger className="org.apache.catalina.logger.FileLogger" directory="logs" prefix="www.local.com_log." suffix=".txt" timestamp="true"/> </Context></Host> 这其中Context里面的docBase为空,文件路径就靠Host里的appBase去指定,这样tomcat认为你这个站点下没有应用,会自动把每个文件夹当作一个虚拟应用处理。修改后的代码片段如下: <Host name="www.local.com" appBase="" unpackWARs="true" autoDeploy="true" xmlValidation="false" xmlNamespaceAware="false"> <Alias>192.168.1.43</Alias> <Context path="" docBase="D://projects//myWebSite//WebContent" reloadable="true"> <Logger className="org.apache.catalina.logger.FileLogger" directory="logs" prefix="www.local.com_log." suffix=".txt" timestamp="true"/> </Context></Host> 可以看到Host里面不再指定appBase了,而是在主机下建立一个应用,应用的文件路径通过docBase来指定,这样就不会再产生找不到class的问题了。 ps:tomcat的这个问题好像是从5.5.28就开始了,记得以前也曾经尝试过升级tomcat,就发生了类似的问题,但是当时没充裕时间去解决,就一直把问题遗留到现在。 |
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