Java 的 XML DocumentBuilder 因解析超时而失败？
Java's XML DocumentBuilder fails with parse time out?
我有一个我认为是典型的用例。我正在使用 Apache HttpClient 为远程（内部）服务器创建 POST。服务器的响应是 XML。
我以流的形式从实体获取响应并将其直接解析为 XML 文档。此代码片段显示了我在做什么。
HttpResponse response = httpClient.execute(request);
int code = response.getStatusLine().getStatusCode();
if(code != 200) {
returnValue.addParameter("msg", "Recieved invalid status code '" + code + "'");
}
else {
HttpEntity entity = response.getEntity();
if (entity != null) {
InputStream iStream = entity.getContent();
try {
DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document doc = db.parse(iStream);
在我的开发箱上 运行 一切正常。但是当我将它部署到我们的一个内部服务器时，我在我的代码片段 db.parse(iStream).
的最后一行收到连接超时异常
为什么？
我的理解（和 Fiddler）表示，当我向实体询问内容时，请求已完成。因此输入流不是通过网络拉取的，因此应该非常快！
有人知道会发生什么吗？
非常感谢
更新，这是我得到的堆栈跟踪
java.net.ConnectException: Connection timed out: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method) ~[?:1.7.0_80]
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79) ~[?:1.7.0_80]
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) ~[?:1.7.0_80]
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) ~[?:1.7.0_80]
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) ~[?:1.7.0_80]
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[?:1.7.0_80]
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[?:1.7.0_80]
at java.net.Socket.connect(Socket.java:579) ~[?:1.7.0_80]
at java.net.Socket.connect(Socket.java:528) ~[?:1.7.0_80]
at sun.net.NetworkClient.doConnect(NetworkClient.java:180) ~[?:1.7.0_80]
at sun.net.www.http.HttpClient.openServer(HttpClient.java:432) ~[?:1.7.0_80]
at sun.net.www.http.HttpClient.openServer(HttpClient.java:527) ~[?:1.7.0_80]
at sun.net.www.http.HttpClient.<init>(HttpClient.java:211) ~[?:1.7.0_80]
at sun.net.www.http.HttpClient.New(HttpClient.java:308) ~[?:1.7.0_80]
at sun.net.www.http.HttpClient.New(HttpClient.java:326) ~[?:1.7.0_80]
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:997) ~[?:1.7.0_80]
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:933) ~[?:1.7.0_80]
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:851) ~[?:1.7.0_80]
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1301) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:643) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(XMLEntityManager.java:1297) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startDTDEntity(XMLEntityManager.java:1264) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.setInputSource(XMLDTDScannerImpl.java:263) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(XMLDocumentScannerImpl.java:1164) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(XMLDocumentScannerImpl.java:1050) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:964) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:243) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:347) ~[?:1.7.0_80]
at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:121) ~[?:1.7.0_80]
at com.XXXXXX.YYYYY.harness.server.Api.postCxml(Api.java:183) [classes/:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_80]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_80]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_80]
at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_80]
at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.invoke(ResourceMethodInvocationHandlerFactory.java:81) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.run(AbstractJavaResourceMethodDispatcher.java:144) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:160) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.server.ServerRuntime.run(ServerRuntime.java:326) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.internal.Errors.call(Errors.java:271) [jersey-common-2.22.2.jar:?]
at org.glassfish.jersey.internal.Errors.call(Errors.java:267) [jersey-common-2.22.2.jar:?]
at org.glassfish.jersey.internal.Errors.process(Errors.java:315) [jersey-common-2.22.2.jar:?]
at org.glassfish.jersey.internal.Errors.process(Errors.java:297) [jersey-common-2.22.2.jar:?]
at org.glassfish.jersey.internal.Errors.process(Errors.java:267) [jersey-common-2.22.2.jar:?]
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317) [jersey-common-2.22.2.jar:?]
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:473) [jersey-container-servlet-core-2.22.2.jar:?]
at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427) [jersey-container-servlet-core-2.22.2.jar:?]
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388) [jersey-container-servlet-core-2.22.2.jar:?]
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341) [jersey-container-servlet-core-2.22.2.jar:?]
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228) [jersey-container-servlet-core-2.22.2.jar:?]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) [catalina.jar:8.0.30]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-websocket.jar:8.0.30]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.30]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30]
at org.apache.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:71) [log4j-web-2.5.jar:2.5]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.30]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212) [catalina.jar:8.0.30]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) [catalina.jar:8.0.30]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) [catalina.jar:8.0.30]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141) [catalina.jar:8.0.30]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [catalina.jar:8.0.30]
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) [catalina.jar:8.0.30]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [catalina.jar:8.0.30]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:521) [catalina.jar:8.0.30]
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096) [tomcat-coyote.jar:8.0.30]
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674) [tomcat-coyote.jar:8.0.30]
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2500) [tomcat-coyote.jar:8.0.30]
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2489) [tomcat-coyote.jar:8.0.30]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [?:1.7.0_80]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [?:1.7.0_80]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:8.0.30]
at java.lang.Thread.run(Thread.java:745) [?:1.7.0_80]
你能post准确的错误消息吗？你能post回复的内容看看里面有什么吗？
但对我来说，这听起来像是网络/安全设置中的问题。
可能是 DocumentBuilder 试图通过网络套接字访问您的 XML 文档的 DTD 失败了？如果 XML 文档中有 DTD 引用，请尝试将其编辑掉以证明原因。
正如 KilleKat 指出的那样，这是由于 DocumentBuilder 试图验证外部 DTD。我用这个 post
Make DocumentBuilder.parse ignore DTD references
并将我的代码修改为
HttpResponse response = httpClient.execute(request);
int code = response.getStatusLine().getStatusCode();
if(code != 200) {
returnValue.addParameter("msg", "Recieved invalid status code '" + code + "'");
}
else {
HttpEntity entity = response.getEntity();
if (entity != null) {
InputStream iStream = entity.getContent();
try {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setValidating(false);
dbf.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(iStream);
我有一个我认为是典型的用例。我正在使用 Apache HttpClient 为远程（内部）服务器创建 POST。服务器的响应是 XML。
我以流的形式从实体获取响应并将其直接解析为 XML 文档。此代码片段显示了我在做什么。
HttpResponse response = httpClient.execute(request);
int code = response.getStatusLine().getStatusCode();
if(code != 200) {
returnValue.addParameter("msg", "Recieved invalid status code '" + code + "'");
}
else {
HttpEntity entity = response.getEntity();
if (entity != null) {
InputStream iStream = entity.getContent();
try {
DocumentBuilder db = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document doc = db.parse(iStream);
在我的开发箱上 运行 一切正常。但是当我将它部署到我们的一个内部服务器时，我在我的代码片段 db.parse(iStream).
为什么？
我的理解（和 Fiddler）表示，当我向实体询问内容时，请求已完成。因此输入流不是通过网络拉取的，因此应该非常快！
有人知道会发生什么吗？
非常感谢
更新，这是我得到的堆栈跟踪
java.net.ConnectException: Connection timed out: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method) ~[?:1.7.0_80]
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79) ~[?:1.7.0_80]
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) ~[?:1.7.0_80]
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) ~[?:1.7.0_80]
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) ~[?:1.7.0_80]
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[?:1.7.0_80]
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[?:1.7.0_80]
at java.net.Socket.connect(Socket.java:579) ~[?:1.7.0_80]
at java.net.Socket.connect(Socket.java:528) ~[?:1.7.0_80]
at sun.net.NetworkClient.doConnect(NetworkClient.java:180) ~[?:1.7.0_80]
at sun.net.www.http.HttpClient.openServer(HttpClient.java:432) ~[?:1.7.0_80]
at sun.net.www.http.HttpClient.openServer(HttpClient.java:527) ~[?:1.7.0_80]
at sun.net.www.http.HttpClient.<init>(HttpClient.java:211) ~[?:1.7.0_80]
at sun.net.www.http.HttpClient.New(HttpClient.java:308) ~[?:1.7.0_80]
at sun.net.www.http.HttpClient.New(HttpClient.java:326) ~[?:1.7.0_80]
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:997) ~[?:1.7.0_80]
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:933) ~[?:1.7.0_80]
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:851) ~[?:1.7.0_80]
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1301) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:643) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(XMLEntityManager.java:1297) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startDTDEntity(XMLEntityManager.java:1264) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.setInputSource(XMLDTDScannerImpl.java:263) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(XMLDocumentScannerImpl.java:1164) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(XMLDocumentScannerImpl.java:1050) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:964) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:243) ~[?:1.7.0_80]
at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:347) ~[?:1.7.0_80]
at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:121) ~[?:1.7.0_80]
at com.XXXXXX.YYYYY.harness.server.Api.postCxml(Api.java:183) [classes/:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_80]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_80]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_80]
at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_80]
at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.invoke(ResourceMethodInvocationHandlerFactory.java:81) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.run(AbstractJavaResourceMethodDispatcher.java:144) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:160) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.server.ServerRuntime.run(ServerRuntime.java:326) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.internal.Errors.call(Errors.java:271) [jersey-common-2.22.2.jar:?]
at org.glassfish.jersey.internal.Errors.call(Errors.java:267) [jersey-common-2.22.2.jar:?]
at org.glassfish.jersey.internal.Errors.process(Errors.java:315) [jersey-common-2.22.2.jar:?]
at org.glassfish.jersey.internal.Errors.process(Errors.java:297) [jersey-common-2.22.2.jar:?]
at org.glassfish.jersey.internal.Errors.process(Errors.java:267) [jersey-common-2.22.2.jar:?]
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317) [jersey-common-2.22.2.jar:?]
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154) [jersey-server-2.22.2.jar:?]
at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:473) [jersey-container-servlet-core-2.22.2.jar:?]
at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427) [jersey-container-servlet-core-2.22.2.jar:?]
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388) [jersey-container-servlet-core-2.22.2.jar:?]
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341) [jersey-container-servlet-core-2.22.2.jar:?]
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228) [jersey-container-servlet-core-2.22.2.jar:?]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) [catalina.jar:8.0.30]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-websocket.jar:8.0.30]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.30]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30]
at org.apache.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:71) [log4j-web-2.5.jar:2.5]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) [catalina.jar:8.0.30]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:8.0.30]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212) [catalina.jar:8.0.30]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) [catalina.jar:8.0.30]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) [catalina.jar:8.0.30]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141) [catalina.jar:8.0.30]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [catalina.jar:8.0.30]
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) [catalina.jar:8.0.30]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) [catalina.jar:8.0.30]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:521) [catalina.jar:8.0.30]
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096) [tomcat-coyote.jar:8.0.30]
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674) [tomcat-coyote.jar:8.0.30]
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2500) [tomcat-coyote.jar:8.0.30]
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2489) [tomcat-coyote.jar:8.0.30]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [?:1.7.0_80]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [?:1.7.0_80]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:8.0.30]
at java.lang.Thread.run(Thread.java:745) [?:1.7.0_80]
你能post准确的错误消息吗？你能post回复的内容看看里面有什么吗？
但对我来说，这听起来像是网络/安全设置中的问题。
可能是 DocumentBuilder 试图通过网络套接字访问您的 XML 文档的 DTD 失败了？如果 XML 文档中有 DTD 引用，请尝试将其编辑掉以证明原因。
正如 KilleKat 指出的那样，这是由于 DocumentBuilder 试图验证外部 DTD。我用这个 post
Make DocumentBuilder.parse ignore DTD references
并将我的代码修改为
HttpResponse response = httpClient.execute(request);
int code = response.getStatusLine().getStatusCode();
if(code != 200) {
returnValue.addParameter("msg", "Recieved invalid status code '" + code + "'");
}
else {
HttpEntity entity = response.getEntity();
if (entity != null) {
InputStream iStream = entity.getContent();
try {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setValidating(false);
dbf.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(iStream);