Java项目在Tomcat下能运行，到WAS上不能运行原因查找

来源：互联网发布：washington post 知乎编辑：程序博客网时间：2024/06/06 09:45

0、分析原因：一般都是jar包冲突

1、定位错误：发布到WAS上定位错误的位置，找到哪行代码报的错误

找到错误位置为 Scheme sch = new Scheme("https", 443, sf);

即Scheme 所在的包产生冲突

2、Tomcat控制台输出：找到报错代码行，在控制台输出该行用的类所引用的jar包

//打印Scheme 所引用的Jar包

      String jarFilePath = Scheme.class.getProtectionDomain().getCodeSource().getLocation().getFile();
        jarFilePath = java.net.URLDecoder.decode(jarFilePath, "UTF-8");
        System.out.println("+++++++++++++++++++++++++++++++"+jarFilePath);

Scheme sch = new Scheme("https", 443, sf);

3、WAS输出：放到WAS上运行输出。

在Tomcat下，控制台输出为

/D:/Workspaces/MyEclipse Blue Edition 10/Binding/WebRoot/WEB-INF/lib/httpclient-4.3.3.jar

找到在WAS上该类解析的日志输出

/wasHome/IBM/WebSphere/AppServer/plugins/com.ibm.ws.prereq.jaxrs.jar

4、方法2

package test;import java.io.IOException;import java.io.PrintWriter;import java.security.CodeSource;import java.security.ProtectionDomain;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.httpclient.Cookie;import org.apache.http.HttpResponse;import org.apache.http.impl.client.DefaultHttpClient;public class TestServlet extends HttpServlet {    /**     * The doGet method of the servlet. <br>     *     * This method is called when a form has its tag value method equals to get.     *      * @param request the request send by the client to the server     * @param response the response send by the server to the client     * @throws ServletException if an error occurred     * @throws IOException if an error occurred     */    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        request.setCharacterEncoding("UTF-8");        response.setCharacterEncoding("UTF-8");        ProtectionDomain pd1 = DefaultHttpClient.class.getProtectionDomain();          CodeSource cs1 = pd1.getCodeSource();                  ProtectionDomain pd2 = HttpResponse.class.getProtectionDomain();          CodeSource cs2 = pd2.getCodeSource();                          ProtectionDomain pd3 = Cookie.class.getProtectionDomain();          CodeSource cs3 = pd3.getCodeSource();          response.setContentType("text/html");        PrintWriter out = response.getWriter();        out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");        out.println("<HTML>");        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");        out.println("  <BODY>");        out.print("   DefaultHttpClient类 导入为httpclient包，运行时JAR包是 >>>>>> ");        out.print(cs1.getLocation());        out.print("<br/>");        out.print("   HttpResponse类 导入为httpcore 包 引用的 JAR包是>>>>>> ");        out.print(cs2.getLocation());        out.print("<br/>");                out.print("   Cookie类 导入为commons-httpclient 包 引用的 JAR包是>>>>>> ");        out.print(cs3.getLocation());        out.print("<br/>");                out.println("  </BODY>");        out.println("</HTML>");        out.flush();        out.close();    }}

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