环境: jdk1.8  maven tomcat7-maven-plugin 2.0
原因:tomcat7-maven-plugin 2.0 不知吃 jdk 1.8,换成tomcat7-maven-plugin 2.2就行,即
<plugin>
                <groupId>at.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
                </configuration>
            </plugin>
org.apache.jasper.JasperException: Unable to compile class for JSP:
An error occurred at line: 1 in the generated java file
The type java.util.Map$Entry cannot be resolved. It is indirectly referenced from required .class files
Stacktrace:
    org.apache.jasperpiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:102)
    org.apache.jasperpiler.ErrorDispatcher.javacError(ErrorDispatcher.java:331)
    org.apache.ateClass(JDTCompiler.java:457)
    org.apache.jasperpiler.Compilerpile(Compiler.java:378)
    org.apache.jasperpiler.Compilerpile(Compiler.java:353)
    org.apache.jasperpiler.Compilerpile(Compiler.java:340)
    org.apache.jasper.JspCompilationContextpile(JspCompilationContext.java:646)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
unable    javax.servlet.
    org.springframework.web.servlet.derMergedOutputModel(InternalResourceView.java:238)
    org.springframework.web.servlet.der(AbstractView.java:264)
    org.springframework.web.der(DispatcherServlet.java:1201)

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