标签: servlets
错误java.lang.OutOfMemoryError:PermGen空间
在我的项目中,我得到如下错误:
SEVERE: Servlet.service() for servlet [dispatcher] in context with path [/ExamSy stem] threw exception [javax.servlet.ServletException: java.lang.OutOfMemoryErro r: PermGen space] with root cause
java.lang.OutOfMemoryError: PermGen space
May 06, 2014 2:44:18 AM org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive /home/anything/public_html/ExamSystemold .war
May 06, 2014 2:47:08 AM org.apache.tomcat.util.digester.Digester startElement
SEVERE: Begin event threw error
java.lang.OutOfMemoryError: PermGen spaceException in thread "ContainerBackgroundProcessor[StandardEngine[Catalina]]" jav a.lang.OutOfMemoryError: PermGen space
Exception in thread "ContainerBackgroundProcessor[StandardEngine[Catalina]]" jav a.lang.OutOfMemoryError: PermGen space
1
推荐指数
推荐指数
1
解决办法
解决办法
3万
查看次数
查看次数
如何使用表单操作从JSP页面映射servlet调用？
我有一个名为Welcome_2.html的JSP页面 
在它的表单操作中,我调用了一个这样的servlet:
<form action="/servlets/MyFirstServlet" method="post" id="form_id">
servlet"MyFirstServlet"在 
WEB-INF类servlet MyFirstServlet
并且jsp位于与WEB-INF处于同一级别的文件夹HTML下
即在练习中我有3个文件夹
HTML META-INF WEB-INF
在web.xml中我有以下代码段
<servlet>
<servlet-name>MyFirstServlet</servlet-name>
<servlet-class>servlets.MyFirstServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>MyFirstServlet</servlet-name>
<url-pattern>/servlets/MyFirstServlet</url-pattern>
</servlet-mapping>
为什么不调用servlet？我点击浏览器上的HTML页面并尝试调用servlet ...我只是一个初学者原谅我的智力不佳.
1
推荐指数
推荐指数
1
解决办法
解决办法
2万
查看次数
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请求参数中的Spring,middle score
有没有办法使用spring中的请求将查询参数映射到中间分数？
我没有问题绑定单个措辞参数这样做:
Uri例子: http://localhost:8080/test/?product=hotels
public class CitiesRequest{
private ProductType product;
public ProductType getProduct() {
return this.product;
}
public void setProduct(String product) {
this.product = product;
}
}
但我希望能够接收这样的参数:
http://localhost:8080/test/?product-type=hotels
1
推荐指数
推荐指数
1
解决办法
解决办法
596
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查看次数
如何在servlet中设置会话变量并在JSP中获取它？
我正在学习java并尝试将一些变量从servlet传递给jsp页面.这是来自servlet页面的代码
@WebServlet("/Welcome")
public class WelcomeServlet extends HttpServlet
{
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{
HttpSession session = request.getSession();
session.setAttribute("MyAttribute", "test value");
// response.sendRedirect("index.jsp");
RequestDispatcher dispatcher = request.getRequestDispatcher("index.jsp");
dispatcher.forward(request, response);
}
}
简单的jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>My Index page</title>
</head>
<body>
Index page
<br />
<%
Object sss = request.getAttribute("MyAttribute");
String a = …1
推荐指数
推荐指数
1
解决办法
解决办法
7万
查看次数
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从Curl POST请求中提取数据
我正在使用curl发出POST请求,如下所示
curl -H 'Accept: application/json' \
-H 'Content-Type: application/json' \
-X POST \
-d '{ "name": "PhoneName", "description": "Phone Description!", "details": { "imeiNumber": "123456789123456", "phoneNumber": "9999999999"}}' \
-k \
http://test.domain.com/myTestServer/devices
但是在servlet中我无法获得任何发布的数据.
public void devices(HttpServletRequest request, HttpServletResponse response) throws IOException {
System.out.println("Got Request for devices");
System.out.println("Request is : "+ request);
System.out.println("Name : " + request.getParameter("name")); //gives null
System.out.println("description : " + request.getParameter("description")); //gives null
Enumeration<String> paramNames = request.getParameterNames(); //Empty Enumeration
while(paramNames.hasMoreElements()){
String paramName = paramNames.nextElement();
System.out.println(paramName + " : " + …1
推荐指数
推荐指数
1
解决办法
解决办法
3021
查看次数
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java.lang.ClassNotFoundException：org.json.JSONException
我正在尝试以字符串格式将json数据从servlet传递到jsp，但是尝试执行相同的操作时却出现了facin错误
我不确定我使用的代码还是tomcat服务器（7.0.33）是否存在问题
这是我的servlet代码
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.json.JSONException;
import org.json.JSONObject;
/**
* Servlet implementation class ChartDemo
*/
@WebServlet("/ChartDemo")
public class ChartDemo extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public ChartDemo() {
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
String[] …1
推荐指数
推荐指数
1
解决办法
解决办法
6978
查看次数
查看次数
HTTP状态500 - servlet appServlet的Servlet.init()引发异常
我想尝试一个简单的程序,但得到以下错误.我正在使用Eclipse Kelper和Tomcat 7.0.尝试过很多东西,但没有什么对我有用.
HTTP Status 500 - Servlet.init() for servlet appServlet threw exception
type Exception report
message Servlet.init() for servlet appServlet threw exception
description The server encountered an internal error that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Servlet.init() for servlet appServlet threw exception
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.lang.Thread.run(Unknown Source)
root cause
java.lang.IllegalArgumentException
org.springframework.asm.ClassReader.<init>(Unknown Source)
org.springframework.asm.ClassReader.<init>(Unknown Source)
org.springframework.asm.ClassReader.<init>(Unknown Source)
org.springframework.core.type.classreading.SimpleMetadataReader.<init>(SimpleMetadataReader.java:52)
org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:80)
org.springframework.core.type.classreading.CachingMetadataReaderFactory.getMetadataReader(CachingMetadataReaderFactory.java:102)
org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:76)
org.springframework.context.annotation.ConfigurationClassParser.getImports(ConfigurationClassParser.java:298)
org.springframework.context.annotation.ConfigurationClassParser.getImports(ConfigurationClassParser.java:300)
org.springframework.context.annotation.ConfigurationClassParser.getImports(ConfigurationClassParser.java:300)
org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:230)
org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:153)
org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:130)
org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:285)
org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:223)
org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:630) …1
推荐指数
推荐指数
1
解决办法
解决办法
6万
查看次数
查看次数
线程本地 - 我做错了什么？
[IMG] http://i60.tinypic.com/121bww0.jpg [/IMG] (请求高代表用户,请链接图片,它会支持这个问题.)
嗨,图像描绘了我理解的网络应用程序流程.浏览器向spring调度程序servlet发送请求.servlet为每个请求生成一个新线程(我假设默认情况下这样做.我不知道如何控制它.)代码如下:
public class Result{
private List<String> response = new ArrayList<String>();
public setResponse(List<String> list){
this.response = list;
}
public list<String> getResponse(){
return response ;
}
}
public class ResponseUtil {
private static final ThreadLocal<Result> responseObject = new InheritableThreadLocal<Result>();
public static void initialize(){
if(responseObject.get() == null){
Result result= new Result();
result.setResponse(new ArrayList<String>());
responseObject.set(result);
}
}
public static void addMessage(String message){
List<String> messages = responseObject.get().getResponse();
messages.add(message);
}
public static Response getResponse(){
return responseObject.get();
}
}
@Component
public class OnboardingEndPointImpl …1
推荐指数
推荐指数
1
解决办法
解决办法
283
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从Java Servlet发送巨大的json对象
Java servlet返回JSON对象.
response.setContentType("application/json");
response.getWriter().write(json.toString());
JSON对象包含从表(数据库)大小获取的数据,大小> 50 MB.
在运行时,servlet会抛出此错误:
java.lang.OutOfMemoryError: Java heap space
似乎问题在于编写json数据.服务器无法为字符串分配大小> 50 MB的连续内存.
我无法找到解决此问题的方法.如何从Servlet发送巨大的JSON对象？
1
推荐指数
推荐指数
1
解决办法
解决办法
1291
查看次数
查看次数
Spring:servlet-mapping - > url-pattern:/*工作但无法显示
web.xml中
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/webmvc-config.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>/</welcome-file>
</welcome-file-list>
/WEB-INF/spring/webmvc-config.xml
<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<property name="mediaTypes">
<map>
<entry key="atom" value="application/atom+xml" />
<entry key="html" value="text/html" />
<entry key="json" value="application/json" />
</map>
</property>
<property name="viewResolvers">
<list>
<bean class="org.springframework.web.servlet.view.BeanNameViewResolver" />
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/" />
<property name="suffix" value=".jsp" />
</bean>
</list>
</property>
<property name="defaultViews">
<list>
<bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView" />
</list>
</property>
</bean>
调节器
@Controller
@RequestMapping ( "/" )
public class IndexController extends BaseController
{
@RequestMapping ( "/" …1
推荐指数
推荐指数
1
解决办法
解决办法
1万
查看次数
查看次数
标签 统计
java ×10
servlets ×10
jsp ×3
spring ×3
json ×2
spring-mvc ×2
curl ×1
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