type Exception report
message rethrew: HttpException: 502 Bad Gateway
description The server encountered an internal error that prevented it from fulfilling this request.
exception
HttpException: HttpException: 502 Bad Gateway: rethrew: HttpException: 502 Bad Gateway com.hp.hpl.jena.sparql.engine.http.HttpQuery.execCommon(HttpQuery.java:273) com.hp.hpl.jena.sparql.engine.http.HttpQuery.execGet(HttpQuery.java:167) com.hp.hpl.jena.sparql.engine.http.HttpQuery.exec(HttpQuery.java:128) com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execModel(QueryEngineHTTP.java:101) com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execDescribe(QueryEngineHTTP.java:95) com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execDescribe(QueryEngineHTTP.java:93) de.fuberlin.wiwiss.pubby.RemoteSPARQLDataSource.execDescribeQuery(RemoteSPARQLDataSource.java:74) de.fuberlin.wiwiss.pubby.RemoteSPARQLDataSource.getResourceDescription(RemoteSPARQLDataSource.java:52) de.fuberlin.wiwiss.pubby.servlets.BaseServlet.getResourceDescription(BaseServlet.java:66) de.fuberlin.wiwiss.pubby.servlets.PageURLServlet.doGet(PageURLServlet.java:36) de.fuberlin.wiwiss.pubby.servlets.BaseURLServlet.doGet(BaseURLServlet.java:33) de.fuberlin.wiwiss.pubby.servlets.BaseServlet.doGet(BaseServlet.java:94) javax.servlet.http.HttpServlet.service(HttpServlet.java:624) javax.servlet.http.HttpServlet.service(HttpServlet.java:731) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
HttpException: 502 Bad Gateway com.hp.hpl.jena.sparql.engine.http.HttpQuery.execCommon(HttpQuery.java:259) com.hp.hpl.jena.sparql.engine.http.HttpQuery.execGet(HttpQuery.java:167) com.hp.hpl.jena.sparql.engine.http.HttpQuery.exec(HttpQuery.java:128) com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execModel(QueryEngineHTTP.java:101) com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execDescribe(QueryEngineHTTP.java:95) com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execDescribe(QueryEngineHTTP.java:93) de.fuberlin.wiwiss.pubby.RemoteSPARQLDataSource.execDescribeQuery(RemoteSPARQLDataSource.java:74) de.fuberlin.wiwiss.pubby.RemoteSPARQLDataSource.getResourceDescription(RemoteSPARQLDataSource.java:52) de.fuberlin.wiwiss.pubby.servlets.BaseServlet.getResourceDescription(BaseServlet.java:66) de.fuberlin.wiwiss.pubby.servlets.PageURLServlet.doGet(PageURLServlet.java:36) de.fuberlin.wiwiss.pubby.servlets.BaseURLServlet.doGet(BaseURLServlet.java:33) de.fuberlin.wiwiss.pubby.servlets.BaseServlet.doGet(BaseServlet.java:94) javax.servlet.http.HttpServlet.service(HttpServlet.java:624) javax.servlet.http.HttpServlet.service(HttpServlet.java:731) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.68 (Ubuntu) logs.