</pre></p><p><b>root cause</b> <pre>java.net.SocketException: Too many open files
java.net.Socket.createImpl(Socket.java:388)
java.net.Socket.<init>(Socket.java:361)
java.net.Socket.<init>(Socket.java:239)
org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:80)
org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:122)
org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707)
org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$HttpConnectionAdapter.open(MultiThreadedHttpConnectionManager.java:1361)
org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387)
org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
org.codehaus.xfire.transport.http.CommonsHttpMessageSender.send(CommonsHttpMessageSender.java:369)
org.codehaus.xfire.transport.http.HttpChannel.sendViaClient(HttpChannel.java:123)
org.codehaus.xfire.transport.http.HttpChannel.send(HttpChannel.java:48)
org.codehaus.xfire.handler.OutMessageSender.invoke(OutMessageSender.java:26)
org.codehaus.xfire.handler.HandlerPipeline.invoke(HandlerPipeline.java:131)
org.codehaus.xfire.client.Invocation.invoke(Invocation.java:79)
org.codehaus.xfire.client.Invocation.invoke(Invocation.java:114)
org.codehaus.xfire.client.Client.invoke(Client.java:336)
org.codehaus.xfire.client.XFireProxy.handleRequest(XFireProxy.java:77)
org.codehaus.xfire.client.XFireProxy.invoke(XFireProxy.java:57)
$Proxy23.registerPassportAll(Unknown Source)
com.woniu.register.webservice.RegisterWebService.centerRegister(RegisterWebService.java:69)
com.woniu.register.service.impl.RegisterService.centerRegister(RegisterService.java:131)
sun.reflect.GeneratedMethodAccessor74.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
$Proxy24.centerRegister(Unknown Source)
com.woniu.register.controller.CenterRegisterController.handleRequestInternal(CenterRegisterController.java:32)
org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153)
com.woniu.register.controller.BaseController.handleRequest(BaseController.java:46)
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:809)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:523)
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:463)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
com.woniu.core.web.EncodingFilter.doFilter(EncodingFilter.java:27)