Question

拜托，我需要你的帮助。

我有这个java类

package com.stephen.crawler;

import org.rosuda.JRI.Rengine;

public class JRI_Interface {

    Rengine r;
    String str_globalPath="/home/pavel/workspace/opendata/r_script/";

public JRI_Interface (String str_fuente) {
    r = new Rengine(new String[] { "--no-save" }, false, null);
    r.eval("source(\""+str_globalPath+str_fuente+"\")");
}

public void exec_RProcedure(String str_procedure) {
    r.eval(str_procedure);
}

public String[] exec_RFunction (String str_procedure) {

    return r.eval(str_procedure).asStringArray();
}

}

如果执行：

，它的效果非常好

package com.stephen.crawler;

public class JRI_Start_1 {
    public static void main(String[] args)
    {


        JRI_Interface j = new JRI_Interface("staticdata.r"); 
        j.exec_RProcedure("loadParametersOD()");
        String obj[]=j.exec_RFunction("getLoadedParametersOD()");
        System.out.println (obj.length);

    }
}

但是，当我使用带有Tomcat的jsp执行时：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"
%>
<%@ page import="com.stephen.crawler.*" %>
<%@ page import="org.rosuda.JRI.*" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>My Title</title>
</head>
<%
JRI_Interface j = new JRI_Interface("staticdata.r"); 
j.exec_RProcedure("loadParametersOD()");
String obj[]=j.exec_RFunction("getLoadedParametersOD()");
%>


<body>

</body>
</html>

我收到以下消息：

> org.apache.jasper.JasperException: Ha sucedido una excepción al
> procesar la página JSP /Inicio.jsp en línea 14
> 
> 11: <title>My Title</title> 
> 12: </head> 
> 13: <% 
> 14: JRI_Interface j = new JRI_Interface("staticdata.r");  
> 15: j.exec_RProcedure("loadParametersOD()"); 
> 16: String obj[]=j.exec_RFunction("getLoadedParametersOD()"); 
> 17: %> 
> 
> Stacktrace:
>   org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:574)
>   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:461)
>   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:729)
>   org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
> causa raíz
> 
> javax.servlet.ServletException: java.lang.NoClassDefFoundError:
> org/rosuda/JRI/Rengine
>   org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:909)
>   org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:838)
>   org.apache.jsp.Inicio_jsp._jspService(Inicio_jsp.java:146)
>   org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
>   javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
>   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438)
>   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:729)
>   org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
> causa raíz
> 
> java.lang.NoClassDefFoundError: org/rosuda/JRI/Rengine
>   com.stephen.crawler.JRI_Interface.<init>(JRI_Interface.java:12)
>   org.apache.jsp.Inicio_jsp._jspService(Inicio_jsp.java:124)
>   org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
>   javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
>   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438)
>   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:729)
>   org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
> causa raíz
> 
> java.lang.ClassNotFoundException: org.rosuda.JRI.Rengine
>   org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1333)
>   org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1167)
>   com.stephen.crawler.JRI_Interface.<init>(JRI_Interface.java:12)
>   org.apache.jsp.Inicio_jsp._jspService(Inicio_jsp.java:124)
>   org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
>   javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
>   org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438)
>   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:729)
>   org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

我想念一下吗？我想我已经配置好了......

非常感谢。

Answer 1

对于Tomcat 6，Web应用程序的 / WEB-INF / classes 目录中的所有解压缩的类和资源，以及 / WEB-INF /下的JAR文件中的类和资源您的Web应用程序的lib 目录对此Web应用程序可见，但对其他应用程序不可见。

服务器环境按以下顺序初始化：

JVM的Bootstrap类
系统类加载器类（fi，＆＃39; $ JAVA_HOME / jre / lib / ext＆＃39;）
/ WEB-INF / classes
/ WEB-INF / lib / * .jar
常见的类加载器类（如果您没有其他选项）（＆$ 39; $ CATALINA_BASE / conf / catalina.properties中的common.loader＆＃39;属性）

您的servlet / webappX / jsp可能需要粗体目录中的类或jar。您的服务器似乎已为Tomcat / jsp正确配置，因为它在您的代码/配置中显示错误。正确运行REngine的代码允许使用命令行或env CLASSPATH，但是从Tomcat或其他Web服务器来看并非如此简单。希望它只是复制REngine jar的问题，尽管你可能需要调整它的配置。

GL

JSP / R错误：java.lang.NoClassDefFoundError：org / rosuda / JRI / Rengine

1 个答案: