java - Apache HttpClient 在使用 Wily 代理时抛出异常

Question

我有一个简单的过滤器类，它使用 Apache HttpClient 连接到同一 tomcat 实例中的不同应用程序。最近，为了提高 Tomcat 服务器的性能，我们向 tomcat 添加了一些自定义 JVM 参数，其中一个参数如下

export CATALINA_OPTS="$CATALINA_OPTS -javaagent:/app/wily/Agent.jar -Dcom.wily.introscope.agentProfile=/app/wily/IntroscopeAgent_IAASTomcat.profile -Dcom.wily.introscope.agent.agentName=iaas_dev_tomcat_instance"

添加此属性后，Apache HttpClient 代码不起作用并抛出以下异常堆栈跟踪。

java.lang.IllegalArgumentException: Socket not created by this factory.
    at org.apache.http.conn.scheme.PlainSocketFactory.isSecure(PlainSocketFactory.java:134)
    at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:136)
    at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
    at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
    at org.apache.http.impl.client.DefaultClientRequestDirector.execute(DefaultClientRequestDirector.java:309)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:501)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:456)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:422)
    at com.vzw.issi.filters.UserValidationFilter.doFilter(UserValidationFilter.java:101)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:205)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)

以下是我的过滤器代码。

httpClient = new DefaultHttpClient();
                HttpPost httpPost = new HttpPost(securityServiceURL);
                // Getting the SM Header
                httpPost.setHeader(StatusReportConstants.SM_USER, httpServletRequest.getHeader(StatusReportConstants.SM_USER));
                List<NameValuePair> urlParameters = new ArrayList<NameValuePair>();
                urlParameters.add(new BasicNameValuePair(StatusReportConstants.SOURCE_APP_NAME, StatusReportConstants.APP_DISPLAY_NAME));
                urlParameters.add(new BasicNameValuePair(StatusReportConstants.SUB_SERVICE_NAME, StatusReportConstants.SERVICE_VALIDATE_USER));
                httpPost.setEntity(new UrlEncodedFormEntity(urlParameters));
                HttpResponse httpResponse = httpClient.execute(httpPost);
                HttpEntity httpEntity = httpResponse.getEntity();
                String jsonString = null; 
                if (null != httpEntity) {
                    jsonString = EntityUtils.toString(httpEntity);
                }
                HttpServletResponse httpServletResponse = (HttpServletResponse)response;

我仅通过 http 进行通信。当我评论 JVM 参数时，此 httpclient 代码工作正常。

为什么会发生这种情况？

Answer 1

显然，代理使用了 java.net.Socket 类，这混淆了旧版本的 HttpClient 连接管理代码。如果您将 HttpClient 升级到版本 4.2.6 或 4.3.1，问题就会消失。