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VelocityViewServlet : Error processing the template

com.fasterxml.jackson.databind.JsonMappingException: No content to map due to end-of-input
 at [Source: java.io.StringReader@281f60fd; line: 1, column: 1]
	at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:164)
	at com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:2931)
	at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2873)
	at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2034)
	at cn.dalian.web.velocity.Tool2017.getBsgkList(Tool2017.java:69)
	at sun.reflect.GeneratedMethodAccessor146.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:267)
	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:197)
	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:175)
	at org.apache.velocity.runtime.parser.node.ASTReference.value(ASTReference.java:327)
	at org.apache.velocity.runtime.parser.node.ASTExpression.value(ASTExpression.java:51)
	at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:95)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:230)
	at org.apache.velocity.Template.merge(Template.java:256)
	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.performMerge(Unknown Source)
	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.mergeTemplate(Unknown Source)
	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doRequest(Unknown Source)
	at org.apache.velocity.tools.view.servlet.VelocityViewServlet.doGet(Unknown Source)
	at cn.dalian.web.servlet.VelocityServlet.doGet(VelocityServlet.java:25)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:120)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:97)
	at com.caucho.server.dispatch.ServletFilterChain.doFilter(ServletFilterChain.java:109)
	at CharacterFilter.doFilter(CharacterFilter.java:18)
	at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:89)
	at cn.dalian.web.filter.CEncodingFilter.doFilter(CEncodingFilter.java:52)
	at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:89)
	at com.opensymphony.oscache.web.filter.CacheFilter.doFilter(CacheFilter.java:175)
	at com.caucho.server.dispatch.FilterFilterChain.doFilter(FilterFilterChain.java:89)
	at com.caucho.server.webapp.DispatchFilterChain.doFilter(DispatchFilterChain.java:131)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:289)
	at com.caucho.server.webapp.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:298)
	at com.caucho.server.webapp.RequestDispatcherImpl.dispatch(RequestDispatcherImpl.java:141)
	at com.caucho.server.dispatch.RewriteDispatchFilterChain.doFilter(RewriteDispatchFilterChain.java:91)
	at com.caucho.server.webapp.WebAppFilterChain.doFilter(WebAppFilterChain.java:156)
	at com.caucho.server.webapp.AccessLogFilterChain.doFilter(AccessLogFilterChain.java:95)
	at com.caucho.server.dispatch.ServletInvocation.service(ServletInvocation.java:289)
	at com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:838)
	at com.caucho.network.listen.TcpSocketLink.dispatchRequest(TcpSocketLink.java:1346)
	at com.caucho.network.listen.TcpSocketLink.handleRequest(TcpSocketLink.java:1302)
	at com.caucho.network.listen.TcpSocketLink.handleRequestsImpl(TcpSocketLink.java:1286)
	at com.caucho.network.listen.TcpSocketLink.handleRequests(TcpSocketLink.java:1194)
	at com.caucho.network.listen.TcpSocketLink.handleAcceptTaskImpl(TcpSocketLink.java:993)
	at com.caucho.network.listen.ConnectionTask.runThread(ConnectionTask.java:117)
	at com.caucho.network.listen.ConnectionTask.run(ConnectionTask.java:93)
	at com.caucho.network.listen.SocketLinkThreadLauncher.handleTasks(SocketLinkThreadLauncher.java:169)
	at com.caucho.network.listen.TcpSocketAcceptThread.run(TcpSocketAcceptThread.java:61)
	at com.caucho.env.thread2.ResinThread2.runTasks(ResinThread2.java:173)
	at com.caucho.env.thread2.ResinThread2.run(ResinThread2.java:118)