问题:org.apache.jasper.JasperException: Unable to compile class for JSP
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发布一个从别处拿来的项目后访问登录页面遇到问题:
严重: Servlet.service() for servlet [jsp] in context with path [/train] threw exception [Unable to compile class for JSP:
An error occurred at line: [54] in the generated java file: [D:\Tomcat8\work\Catalina\localhost\train\org\apache\jsp\Login_jsp.java]
The method getJspApplicationContext(ServletContext) is undefined for the type JspFactory
Stacktrace:] with root cause
org.apache.jasper.JasperException: Unable to compile class for JSP:
An error occurred at line: [54] in the generated java file: [D:\Tomcat8\work\Catalina\localhost\train\org\apache\jsp\Login_jsp.java]
The method getJspApplicationContext(ServletContext) is undefined for the type JspFactory
Stacktrace:
at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:102)
at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:198)
at org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:450)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:361)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:336)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:323)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:580)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:356)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
猜测是否是导入的jar的问题,把build path中的javaEE5 Library 换成了JavaEE6,项目 Clean后再Build,然后发布。问题依旧。
项目中使用的jre是1.7版,而MyEclipse首选项中的Java Compiler是1.6,把它改成1.7,结果项目上出现叉叉。
查看Problem窗口,看到有一句这样的错误信息:
Description ResourcePath LocationType
Java compiler level does not match the version of the installed Java project facet.train UnknownFaceted Project Problem (Java Version Mismatch)
再在首选项中MyEclipse->Project Facets 中看到,此处的Java版本是1.6,把它也改为1.7,如下:
做了很多尝试:
去除Build Path中对JavaEE6的导入。
将web.xml中的版本由2.5改为3.0。
换成MyEclipse内置的Tomcat.
...
都不管用.
最后发现WebContent\lib目录下除了servlet-api.jar,还有另一个servlet.jar,这个jar查看后确定是另一个版本的同类文件。删除此servlet.jar,保留和Tomcat\lib下一致的servlet-api.jar,Clean->Build再deployed,终于正常了!
此时我项目中导入的是jre1.7的库,项目的Project Facets是1.6,工作空间的Compiler兼容版本是1.6.
Build Path:
WEB-INF\lib下面的jar:
web.xml中依然是3.0规范。
总结一句:项目中使用的servlet api 的版本一定要和Tomcat下面的一致。
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