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VelocityViewServlet : Error processing a template for path '/dispatcher'

Invocation of method 'getSelfDefinedById' in class com.mysteel.esite.tags.SelfDefinedTag threw exception org.springframework.remoting.RemoteConnectFailureException: Cannot connect to Hessian remote service at [http://101.52.212.202:1985/api/esite/CustomPageService]; nested exception is com.caucho.hessian.client.HessianConnectionException: 502: java.io.IOException: Server returned HTTP response code: 502 for URL: http://101.52.212.202:1985/api/esite/CustomPageService @ /templates/handtailor/2522855/left.html[40,78]

org.springframework.remoting.RemoteConnectFailureException: Cannot connect to Hessian remote service at [http://101.52.212.202:1985/api/esite/CustomPageService]; nested exception is com.caucho.hessian.client.HessianConnectionException: 502: java.io.IOException: Server returned HTTP response code: 502 for URL: http://101.52.212.202:1985/api/esite/CustomPageService
	at org.springframework.remoting.caucho.HessianClientInterceptor.convertHessianAccessException(HessianClientInterceptor.java:258)
	at org.springframework.remoting.caucho.HessianClientInterceptor.invoke(HessianClientInterceptor.java:227)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
	at com.sun.proxy.$Proxy8.getCustomPageById(Unknown Source)
	at com.mysteel.esite.application.CustomPageAOImpl.getCustomPageById(CustomPageAOImpl.java:27)
	at com.mysteel.esite.tags.SelfDefinedTag.getSelfDefinedById(SelfDefinedTag.java:20)
	at sun.reflect.GeneratedMethodAccessor35.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:295)
	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:245)
	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:203)
	at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:419)
	at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:73)
	at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:125)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
	at org.apache.velocity.runtime.directive.Parse.render(Parse.java:224)
	at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
	at org.apache.velocity.Template.merge(Template.java:254)
	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.performMerge(VelocityViewServlet.java:762)
	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.mergeTemplate(VelocityViewServlet.java:719)
	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doRequest(VelocityViewServlet.java:551)
	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doGet(VelocityViewServlet.java:507)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at com.mysteel.common.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:77)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:617)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
	at org.apache.tomcat.util.net.AprEndpoint$SocketWithOptionsProcessor.run(AprEndpoint.java:2440)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)
Caused by: com.caucho.hessian.client.HessianConnectionException: 502: java.io.IOException: Server returned HTTP response code: 502 for URL: http://101.52.212.202:1985/api/esite/CustomPageService
	at com.caucho.hessian.client.HessianURLConnection.sendRequest(HessianURLConnection.java:142)
	at com.caucho.hessian.client.HessianProxy.sendRequest(HessianProxy.java:283)
	at com.caucho.hessian.client.HessianProxy.invoke(HessianProxy.java:170)
	at com.sun.proxy.$Proxy7.getCustomPageById(Unknown Source)
	at sun.reflect.GeneratedMethodAccessor36.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.springframework.remoting.caucho.HessianClientInterceptor.invoke(HessianClientInterceptor.java:222)
	... 48 more
Caused by: java.io.IOException: Server returned HTTP response code: 502 for URL: http://101.52.212.202:1985/api/esite/CustomPageService
	at sun.reflect.GeneratedConstructorAccessor26.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
	at sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1676)
	at sun.net.www.protocol.http.HttpURLConnection$6.run(HttpURLConnection.java:1674)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnection.java:1672)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1245)
	at com.caucho.hessian.client.HessianURLConnection.sendRequest(HessianURLConnection.java:122)
	... 55 more
Caused by: java.io.IOException: Server returned HTTP response code: 502 for URL: http://101.52.212.202:1985/api/esite/CustomPageService
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1627)
	at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:468)
	at com.caucho.hessian.client.HessianURLConnection.sendRequest(HessianURLConnection.java:109)
	... 55 more