java运行ApacheDefaultHttpClient并在Tomcat中重新部署web应用程序意味着永久空间
我已经解决了这个问题几个月了,现在我确信HttpClient应该为我的permament PermGen空间错误负责
我的web应用程序使用Servlet。 其中一项功能允许用户连接到远程设备,并使用REST服务通过HTTP请求该设备的状态
当我重新部署Tomcat(在开发阶段,我不在生产中)并且PermGen出现时,问题就出现了。 我知道问题与此HttpClient有关,因为跟踪:
jun 19, 2013 4:51:34 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: El Servlet.service() para el servlet [dispatcher] en el contexto con ruta [] lanzó la excepción [Handler processing failed; nested exception is java.lang.OutOfMemoryError: PermGen space] con causa raíz
java.lang.OutOfMemoryError: PermGen space
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2904)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1173)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1681)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
at org.apache.http.impl.cookie.RFC2109Spec.<init>(RFC2109Spec.java:83)
at org.apache.http.impl.cookie.RFC2965Spec.<init>(RFC2965Spec.java:67)
at org.apache.http.impl.cookie.BestMatchSpec.getStrict(BestMatchSpec.java:75)
at org.apache.http.impl.cookie.BestMatchSpec.getVersion(BestMatchSpec.java:209)
at org.apache.http.client.protocol.RequestAddCookies.process(RequestAddCookies.java:202)
at org.apache.http.protocol.ImmutableHttpProcessor.process(ImmutableHttpProcessor.java:109)
at org.apache.http.protocol.HttpRequestExecutor.preProcess(HttpRequestExecutor.java:176)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:519)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:784)
at com.pe.f.web.PlantController.getStatus(PlantController.java:431)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:100)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:604)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:565)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
在哪里
at com.pe.f.web.PlantController.getStatus(PlantController.java:431)
是启动HTTP请求的方法
我需要解决两个主要问题:
1-这个问题具体与HttpClient有关,还是我做错了什么
这是我的代码:
for(Gdu g : p.getGduCollection()){
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
httpClient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 30000);
get = new HttpGet("http://"
+ p.getInstallationId().getIprouter()
+ ":"
+ g.getHttpPort().toString()
+ "/FSP/status");
HttpResponse response = httpClient.execute(get);
if (response.getStatusLine().getStatusCode() != 200) {
throw new RuntimeException("Failed : HTTP error code : "
+ response.getStatusLine().getStatusCode());
}
StringBuilder inputStringBuilder = new StringBuilder();
BufferedReader br = new BufferedReader(
new InputStreamReader((response.getEntity().getContent())));
String line;
while ((line = br.readLine()) != null) {
if(!line.contains("<?xml")){
inputStringBuilder.append(line);
}
}
httpClient.getConnectionManager().shutdown();
logger.debug(inputStringBuilder.toString());
Document xml = loadXMLFromString(inputStringBuilder.toString());
// sets the date
status.setDate(new SimpleDateFormat("dd/MM/yyyy HH:mm:ss").parse(xml.getElementsByTagName("time").item(0).getTextContent()));
// add power of each GDU
Float f = Float.parseFloat(status.getPower().split(" ")[0]);
f += Float.parseFloat(xml.getElementsByTagName("power").item(0).getTextContent().split(" ")[0]);
status.setPower(f.toString() + " kW");
// add the energy of each GDU
Float f2 = Float.parseFloat(status.getEnergy().split(" ")[0].replace(",", "."));
f2 += Float.parseFloat(xml.getElementsByTagName("energy").item(0).getTextContent().split(" ")[0]);
status.setEnergy(String.format("%.3f", f2 - 0.005).replace(",", ".") + " MWh");
NodeList nl = xml.getElementsByTagName("status");
stat = 0;
for(int j=0; j < nl.getLength(); j++){
if(nl.item(j).getNodeType() == Node.ELEMENT_NODE){ // Node
Element e = (Element) nl.item(j);
stat += Integer.valueOf(e.getElementsByTagName("value").item(0).getTextContent());
}
}
status.setPlantStatus(String.valueOf(stat + Integer.parseInt(status.getPlantStatus())));
} catch (ConnectTimeoutException cte ) {
status.setConnError("Unnable to communicate with plant. Reason: Connection Timeout.");
} catch (SocketTimeoutException ste) {
status.setConnError("Unnable to communicate with plant. Reason: Socket Timeout.");
} catch (IOException ex) {
status.setConnError("Unnable to communicate with plant. Reason: I/O Exception.");
} finally {
if(get != null){
get.releaseConnection();
}
}
}
我的代码打开一个HTTP连接,请求状态并以字符串形式接收XML。 一旦得到XML,我就用这些信息创建一个状态对象
2.你建议使用其他更瘦的HTTP客户端吗?可能是httpurl连接
我知道你们大多数人都会建议增加永久内存堆。 关于这个话题,我读了很多书。 我不认为增加堆大小有什么意义,因为最终,如果问题出现,它就会出现
提前谢谢
更新: 在SO post之后,我避免了HttpClient中的自动重试请求。 在接受任何答案之前,我将继续在开发服务器和生产服务器上执行测试
参考资料:
共 (0) 个答案