我想构建一个简单的java servlet在我的机器上的tomcat服务器上运行。NoClassDefFoundError尝试加载与tomcat的servlet中的dll
我的servlet代码是:
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class javaservlet
*/
@WebServlet(description = "java servlet", urlPatterns = { "/javaservlet" })
public class javaservlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public javaservlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
PrintWriter writer = response.getWriter();
calldll callingdll = new calldll();
ServletContext context = getServletConfig().getServletContext();
String path = context.getContextPath();
writer.println(path);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
,它工作正常
我也有一个加载DLL中的第二类(不是calldll callingdll = new calldll();
部分我会在下面我得到了什么的错误解释)文件名为“calldll.dll”(做了所有用javac,JAVAH和东西的工作,它的工作原理)我的DLL文件被放到C:\apache-tomcat-7.0.37\wtpwebapps\myServlet\WEB-INF\lib
,我已经指出的天然存在的构建路径和我的类代码为
public class calldll {
private native void print();
public static void main (String[] args){
new calldll().print();
}
static {
System.loadLibrary("calldll");
}
}
我来自哪里做的dll
我的C文件是一个非常简单的
#include<jni.h>
#include<stdio.h>
#include<windows.h>
#include "calldll.h"
JNIEXPORT void JNICALL
Java_calldll_print(JNIEnv*env,jobject obj)
{
printf("It Works!");
return;
}
当我运行在那里我调用加载DLL我得到这个调用DLL类javaservlet:
java.lang.NoClassDefFoundError: Could not initialize class calldll
javaservlet.doGet(javaservlet.java:33)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
的奇怪的是,当我单独运行java类时,消息“It works”出现,所以类成功加载了dll。但是,当我在servlet创建类的实例,它从servlet犯规是不这是我的问题....
我加入calldll类
赶上(UnsatisfiedLinkError E) System.err.println(“本机代码库无法加载。\ n”+ e); }
,看它是否是静态的问题,我得到以下错误,当我运行的servlet
Native code library failed to load.
java.lang.UnsatisfiedLinkError: no calldll in java.library.path
,但如果我单独执行它我calldll类仍正常工作......还等什么是发生在我做错了这个servlet:■
添加的servlet .jar添加到你的类路径中。希望它有效。如果你使用的是Eclipse,你可以添加为外部库尝试。 – 2013-02-27 09:49:38
感谢您的重播,您可以更具体地了解我必须做什么? – user878813 2013-02-27 09:50:33
我相信你在用'System.loadLibrary(“calldll”);'得到错误。捕获'loadLibrary'方法抛出的异常。这将有助于找出错误的确切原因。 – 2013-02-27 09:52:16