Question

我在我的测试网络项目中尝试Guice 3.0。我在web.xml中注册了GuiceFilter和GuiceServletContextListener。比我在ServletModule中创建并注册了一个servlet：

public class MyModule extends AbstractModule {

    @Override
    protected void configure() {
        install(new ServletModule() {
            @Override
            protected void configureServlets() {
                serve("/enter").with(Dispatcher.class);
            }
        });
        bind(Logger.class).toInstance(Logger.getLogger("myLogger"));
    }
}

按预期调用Dispather，但是当它转发到JSP页面时，我收到错误：

request.getRequestDispatcher（“/ persons.jsp”）。forward（request，response）;

    org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: [56] in the generated java file: [C:\Users\user\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\work\Catalina\localhost\web1\org\apache\jsp\persons_jsp.java]
The method getDispatcherType() is undefined for the type HttpServletRequest

Stacktrace:
    org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:103)
    org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:199)
    org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:450)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:361)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:336)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:323)
    org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:564)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    servlets.Dispatcher.showPersons(Dispatcher.java:81)
    servlets.Dispatcher.process(Dispatcher.java:50)
    servlets.Dispatcher.doGet(Dispatcher.java:86)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:263)
    com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:178)
    com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91)
    com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:62)
    com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118)
    com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113)

我认为这是由于Tomcat 8.0使用的servlet-api 3.1和guice使用的servlet-api 2.5无法实现的。

在没有将我的应用服务器降级到servlet-api 2.5的情况下，是否有解决此问题的方法？

Tomcat的文档说使用2.5的最新版本是Tomcat 6。

更新事实证明，servlet-api在guice-servlet中被声明为“提供”依赖。我所要做的就是正确地声明我的依赖项以省略这个lib。我使用常春藤的当前配置：

<ivy-module version="2.0">
    <info organisation="myorg" module="mymodule"/>
    <dependencies defaultconfmapping="*->default">
        <dependency org="com.google.inject" name="guice" rev="3.0"/>
        <dependency org="org.hibernate" name="hibernate-core" rev="4.3.8.Final"/>
        <dependency org="com.google.inject.extensions" name="guice-servlet" rev="3.0"/>     
    </dependencies>
</ivy-module>

使用带有servlet-api 3.1的guice

0 个答案: