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对 sym 100 压测，后台已经各种抛出错误，无法运转了

本贴最后更新于 2495 天前，其中的信息可能已经时过境迁


[ERROR]-[2018-01-06 02:40:50]-[org.b3log.latke.servlet.renderer.freemarker.AbstractFreeMarkerRenderer:138]: FreeMarker renders error
FreeMarker template error:
The following has evaluated to null or missing:
==> article  [in template "article.ftl" at line 7, column 25]

----
Tip: If the failing expression is known to be legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----

----
FTL stack trace ("~" means nesting-related):
        - Failed at: ${article.articleTitleEmojUnicode}  [in template "article.ftl" at line 7, column 23]
        - Reached through: @head title="${article.articleTitleEm...  [in template "article.ftl" at line 7, column 9]
----

Java stack trace (for programmers):
----
freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...]
        at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:131)
        at freemarker.core.UnexpectedTypeException.newDesciptionBuilder(UnexpectedTypeException.java:77)
        at freemarker.core.UnexpectedTypeException.<init>(UnexpectedTypeException.java:40)
        at freemarker.core.NonHashException.<init>(NonHashException.java:46)
        at freemarker.core.Dot._eval(Dot.java:45)
        at freemarker.core.Expression.eval(Expression.java:78)
        at freemarker.core.Expression.evalAndCoerceToString(Expression.java:82)
        at freemarker.core.DollarVariable.accept(DollarVariable.java:41)
        at freemarker.core.Environment.visit(Environment.java:324)
        at freemarker.core.MixedContent.accept(MixedContent.java:54)
        at freemarker.core.Environment.visit(Environment.java:324)
        at freemarker.core.Environment.renderElementToString(Environment.java:2196)
        at freemarker.core.StringLiteral.evalAndCoerceToString(StringLiteral.java:96)
        at freemarker.core.StringLiteral._eval(StringLiteral.java:73)
        at freemarker.core.Expression.eval(Expression.java:78)
        at freemarker.core.Environment.setMacroContextLocalsFromArguments(Environment.java:739)
        at freemarker.core.Environment.invoke(Environment.java:689)
        at freemarker.core.UnifiedCall.accept(UnifiedCall.java:84)
        at freemarker.core.Environment.visit(Environment.java:324)
        at freemarker.core.MixedContent.accept(MixedContent.java:54)
        at freemarker.core.Environment.visit(Environment.java:324)
        at freemarker.core.Environment.process(Environment.java:302)
        at freemarker.template.Template.process(Template.java:325)
        at org.b3log.latke.servlet.renderer.freemarker.AbstractFreeMarkerRenderer.genHTML(AbstractFreeMarkerRenderer.java:162)
        at org.b3log.symphony.processor.SkinRenderer.genHTML(SkinRenderer.java:155)
        at org.b3log.latke.servlet.renderer.freemarker.AbstractFreeMarkerRenderer.render(AbstractFreeMarkerRenderer.java:133)
        at org.b3log.latke.servlet.DispatcherServlet.result(DispatcherServlet.java:111)
        at org.b3log.latke.servlet.DispatcherServlet.service(DispatcherServlet.java:89)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.b3log.latke.servlet.filter.EncodingFilter.doFilter(EncodingFilter.java:71)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:501)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1376)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:745)
[ERROR]-[2018-01-06 02:40:50]-[org.b3log.latke.repository.jdbc.JdbcRepository:847]: Gets connection failed
com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 5000, active 50, maxActive 50
        at com.alibaba.druid.pool.DruidDataSource.getConnectionInternal(DruidDataSource.java:1267)
        at com.alibaba.druid.pool.DruidDataSource.getConnectionDirect(DruidDataSource.java:1086)
        at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1066)
        at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1056)
        at org.b3log.latke.repository.jdbc.util.Connections.getConnection(Connections.java:192)
        at org.b3log.latke.repository.jdbc.JdbcRepository.getConnection(JdbcRepository.java:843)
        at org.b3log.latke.repository.jdbc.JdbcRepository.get(JdbcRepository.java:401)
        at org.b3log.latke.repository.AbstractRepository.get(AbstractRepository.java:135)
        at org.b3log.symphony.repository.RoleRepository_$$_jvst50e_11._d8get(RoleRepository_$$_jvst50e_11.java)
        at sun.reflect.GeneratedMethodAccessor108.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.b3log.latke.ioc.bean.JavassistMethodHandler.invoke(JavassistMethodHandler.java:106)
        at org.b3log.symphony.repository.RoleRepository_$$_jvst50e_11.get(RoleRepository_$$_jvst50e_11.java)
        at org.b3log.symphony.service.RoleQueryService.getRole(RoleQueryService.java:141)
        at org.b3log.symphony.service.RoleQueryService_$$_jvst50e_c._d7getRole(RoleQueryService_$$_jvst50e_c.java)
        at sun.reflect.GeneratedMethodAccessor107.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.b3log.latke.ioc.bean.JavassistMethodHandler.invoke(JavassistMethodHandler.java:106)
        at org.b3log.symphony.service.RoleQueryService_$$_jvst50e_c.getRole(RoleQueryService_$$_jvst50e_c.java)
        at org.b3log.symphony.processor.advice.PermissionGrant.doAdvice(PermissionGrant.java:81)
        at org.b3log.symphony.processor.advice.PermissionGrant_$$_jvst50e_8d._d1doAdvice(PermissionGrant_$$_jvst50e_8d.java)
        at sun.reflect.GeneratedMethodAccessor119.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.b3log.latke.ioc.bean.JavassistMethodHandler.invoke(JavassistMethodHandler.java:106)
        at org.b3log.symphony.processor.advice.PermissionGrant_$$_jvst50e_8d.doAdvice(PermissionGrant_$$_jvst50e_8d.java)
        at org.b3log.latke.servlet.handler.AdviceHandler.handle(AdviceHandler.java:119)
        at org.b3log.latke.servlet.HttpControl.nextHandler(HttpControl.java:99)
        at org.b3log.latke.servlet.handler.ArgsHandler.handle(ArgsHandler.java:60)
        at org.b3log.latke.servlet.HttpControl.nextHandler(HttpControl.java:99)
        at org.b3log.latke.servlet.handler.RequestDispatchHandler.handle(RequestDispatchHandler.java:92)
        at org.b3log.latke.servlet.HttpControl.nextHandler(HttpControl.java:99)
        at org.b3log.latke.servlet.handler.RequestPrepareHandler.handle(RequestPrepareHandler.java:45)
        at org.b3log.latke.servlet.HttpControl.nextHandler(HttpControl.java:99)
        at org.b3log.latke.servlet.handler.StaticResourceHandler.handle(StaticResourceHandler.java:119)
        at org.b3log.latke.servlet.HttpControl.nextHandler(HttpControl.java:99)
        at org.b3log.latke.servlet.DispatcherServlet.service(DispatcherServlet.java:84)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.b3log.latke.servlet.filter.EncodingFilter.doFilter(EncodingFilter.java:71)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:501)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1376)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:745)
[ERROR]-[2018-01-06 02:40:50]-[org.b3log.latke.repository.jdbc.JdbcRepository:412]: get:null
java.lang.NullPointerException
[ERROR]-[2018-01-06 02:40:50]-[org.b3log.symphony.service.RoleQueryService:149]: Gets role failed
org.b3log.latke.repository.RepositoryException: java.lang.NullPointerException
        at org.b3log.latke.repository.jdbc.JdbcRepository.get(JdbcRepository.java:413)
        at org.b3log.latke.repository.AbstractRepository.get(AbstractRepository.java:135)
        at org.b3log.symphony.repository.RoleRepository_$$_jvst50e_11._d8get(RoleRepository_$$_jvst50e_11.java)
        at sun.reflect.GeneratedMethodAccessor108.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.b3log.latke.ioc.bean.JavassistMethodHandler.invoke(JavassistMethodHandler.java:106)
        at org.b3log.symphony.repository.RoleRepository_$$_jvst50e_11.get(RoleRepository_$$_jvst50e_11.java)
        at org.b3log.symphony.service.RoleQueryService.getRole(RoleQueryService.java:141)
        at org.b3log.symphony.service.RoleQueryService_$$_jvst50e_c._d7getRole(RoleQueryService_$$_jvst50e_c.java)
        at sun.reflect.GeneratedMethodAccessor107.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.b3log.latke.ioc.bean.JavassistMethodHandler.invoke(JavassistMethodHandler.java:106)
        at org.b3log.symphony.service.RoleQueryService_$$_jvst50e_c.getRole(RoleQueryService_$$_jvst50e_c.java)
        at org.b3log.symphony.processor.advice.PermissionGrant.doAdvice(PermissionGrant.java:81)
        at org.b3log.symphony.processor.advice.PermissionGrant_$$_jvst50e_8d._d1doAdvice(PermissionGrant_$$_jvst50e_8d.java)
        at sun.reflect.GeneratedMethodAccessor119.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.b3log.latke.ioc.bean.JavassistMethodHandler.invoke(JavassistMethodHandler.java:106)
        at org.b3log.symphony.processor.advice.PermissionGrant_$$_jvst50e_8d.doAdvice(PermissionGrant_$$_jvst50e_8d.java)
        at org.b3log.latke.servlet.handler.AdviceHandler.handle(AdviceHandler.java:119)
        at org.b3log.latke.servlet.HttpControl.nextHandler(HttpControl.java:99)
        at org.b3log.latke.servlet.handler.ArgsHandler.handle(ArgsHandler.java:60)
        at org.b3log.latke.servlet.HttpControl.nextHandler(HttpControl.java:99)
        at org.b3log.latke.servlet.handler.RequestDispatchHandler.handle(RequestDispatchHandler.java:92)
        at org.b3log.latke.servlet.HttpControl.nextHandler(HttpControl.java:99)
        at org.b3log.latke.servlet.handler.RequestPrepareHandler.handle(RequestPrepareHandler.java:45)
        at org.b3log.latke.servlet.HttpControl.nextHandler(HttpControl.java:99)
        at org.b3log.latke.servlet.handler.StaticResourceHandler.handle(StaticResourceHandler.java:119)
        at org.b3log.latke.servlet.HttpControl.nextHandler(HttpControl.java:99)
        at org.b3log.latke.servlet.DispatcherServlet.service(DispatcherServlet.java:84)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.b3log.latke.servlet.filter.EncodingFilter.doFilter(EncodingFilter.java:71)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:501)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1376)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
[ERROR]-[2018-01-06 02:40:50]-[org.b3log.latke.servlet.HttpControl:104]: Request [
    method=GET,
    URL=http://www.3xmq.com:8080/article/1515141092284,
    contentType=null,
    characterEncoding=UTF-8,
    local=[
        addr=172.17.99.240,
        port=8080,
        name=3xmq],
    remote=[
        addr=39.106.78.43,
        port=35882,
        host=39.106.78.43],
    headers=[
        connection=upgrade
        host=www.3xmq.com:8080
        user-agent=Apache-HttpClient/4.5.3 (Java/1.8.0_121)
    ]
] processing failed 
java.lang.NullPointerException
        at org.b3log.symphony.processor.advice.PermissionGrant.doAdvice(PermissionGrant.java:84)
        at org.b3log.symphony.processor.advice.PermissionGrant_$$_jvst50e_8d._d1doAdvice(PermissionGrant_$$_jvst50e_8d.java)
        at sun.reflect.GeneratedMethodAccessor119.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.b3log.latke.ioc.bean.JavassistMethodHandler.invoke(JavassistMethodHandler.java:106)
        at org.b3log.symphony.processor.advice.PermissionGrant_$$_jvst50e_8d.doAdvice(PermissionGrant_$$_jvst50e_8d.java)
        at org.b3log.latke.servlet.handler.AdviceHandler.handle(AdviceHandler.java:119)
        at org.b3log.latke.servlet.HttpControl.nextHandler(HttpControl.java:99)
        at org.b3log.latke.servlet.handler.ArgsHandler.handle(ArgsHandler.java:60)
        at org.b3log.latke.servlet.HttpControl.nextHandler(HttpControl.java:99)
        at org.b3log.latke.servlet.handler.RequestDispatchHandler.handle(RequestDispatchHandler.java:92)
        at org.b3log.latke.servlet.HttpControl.nextHandler(HttpControl.java:99)
        at org.b3log.latke.servlet.handler.RequestPrepareHandler.handle(RequestPrepareHandler.java:45)
        at org.b3log.latke.servlet.HttpControl.nextHandler(HttpControl.java:99)
        at org.b3log.latke.servlet.handler.StaticResourceHandler.handle(StaticResourceHandler.java:119)
        at org.b3log.latke.servlet.HttpControl.nextHandler(HttpControl.java:99)
        at org.b3log.latke.servlet.DispatcherServlet.service(DispatcherServlet.java:84)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.b3log.latke.servlet.filter.EncodingFilter.doFilter(EncodingFilter.java:71)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:501)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1376)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:745)
[ERROR]-[2018-01-06 02:40:50]-[org.b3log.latke.servlet.renderer.freemarker.AbstractFreeMarkerRenderer:138]: FreeMarker renders error
FreeMarker template error:
The following has evaluated to null or missing:
==> article  [in template "article.ftl" at line 7, column 25]

----
Tip: If the failing expression is known to be legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----

----
FTL stack trace ("~" means nesting-related):
        - Failed at: ${article.articleTitleEmojUnicode}  [in template "article.ftl" at line 7, column 23]
        - Reached through: @head title="${article.articleTitleEm...  [in template "article.ftl" at line 7, column 9]
----

Java stack trace (for programmers):
----
freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...]
        at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:131)
        at freemarker.core.UnexpectedTypeException.newDesciptionBuilder(UnexpectedTypeException.java:77)
        at freemarker.core.UnexpectedTypeException.<init>(UnexpectedTypeException.java:40)
        at freemarker.core.NonHashException.<init>(NonHashException.java:46)
        at freemarker.core.Dot._eval(Dot.java:45)
        at freemarker.core.Expression.eval(Expression.java:78)
        at freemarker.core.Expression.evalAndCoerceToString(Expression.java:82)
        at freemarker.core.DollarVariable.accept(DollarVariable.java:41)
        at freemarker.core.Environment.visit(Environment.java:324)
        at freemarker.core.MixedContent.accept(MixedContent.java:54)
        at freemarker.core.Environment.visit(Environment.java:324)
        at freemarker.core.Environment.renderElementToString(Environment.java:2196)
        at freemarker.core.StringLiteral.evalAndCoerceToString(StringLiteral.java:96)
        at freemarker.core.StringLiteral._eval(StringLiteral.java:73)
        at freemarker.core.Expression.eval(Expression.java:78)
        at freemarker.core.Environment.setMacroContextLocalsFromArguments(Environment.java:739)
        at freemarker.core.Environment.invoke(Environment.java:689)
        at freemarker.core.UnifiedCall.accept(UnifiedCall.java:84)
        at freemarker.core.Environment.visit(Environment.java:324)
        at freemarker.core.MixedContent.accept(MixedContent.java:54)
        at freemarker.core.Environment.visit(Environment.java:324)
        at freemarker.core.Environment.process(Environment.java:302)
        at freemarker.template.Template.process(Template.java:325)
        at org.b3log.latke.servlet.renderer.freemarker.AbstractFreeMarkerRenderer.genHTML(AbstractFreeMarkerRenderer.java:162)
        at org.b3log.symphony.processor.SkinRenderer.genHTML(SkinRenderer.java:155)
        at org.b3log.latke.servlet.renderer.freemarker.AbstractFreeMarkerRenderer.render(AbstractFreeMarkerRenderer.java:133)
        at org.b3log.latke.servlet.DispatcherServlet.result(DispatcherServlet.java:111)
        at org.b3log.latke.servlet.DispatcherServlet.service(DispatcherServlet.java:89)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.b3log.latke.servlet.filter.EncodingFilter.doFilter(EncodingFilter.java:71)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:501)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1376)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:745)

mysql 慢查询

# Time: 2018-01-05T18:44:02.436437Z
# User@Host: root[root] @  [39.106.78.43]  Id:    99
# Query_time: 6.401251  Lock_time: 0.000069 Rows_sent: 10  Rows_examined: 10
SET timestamp=1515177842;
select  *  from symphony_article where (articleRandomDouble>=0.0 and articleRandomDouble<=0.13575782778368972 and articleStatus=0) limit 0,10;
# Time: 2018-01-05T18:44:15.246272Z
# User@Host: root[root] @  [39.106.78.43]  Id:    88
# Query_time: 13.830847  Lock_time: 0.000155 Rows_sent: 10  Rows_examined: 10
SET timestamp=1515177855;
select  *  from symphony_article where (articleRandomDouble>=0.0 and articleRandomDouble<=0.16891545026924093 and articleStatus=0) limit 0,10;
# Time: 2018-01-05T18:44:44.958681Z
# User@Host: root[root] @  [39.106.78.43]  Id:    69
# Query_time: 12.792900  Lock_time: 0.000097 Rows_sent: 10  Rows_examined: 10
SET timestamp=1515177884;
select  *  from symphony_article where (articleRandomDouble>=0.0 and articleRandomDouble<=0.18897769303593281 and articleStatus=0) limit 0,10;
# Time: 2018-01-05T18:44:45.332415Z
# User@Host: root[root] @  [39.106.78.43]  Id:   109
# Query_time: 14.992689  Lock_time: 0.000054 Rows_sent: 10  Rows_examined: 10
SET timestamp=1515177885;
select  *  from symphony_article where (articleRandomDouble>=0.0 and articleRandomDouble<=0.19932722235331668 and articleStatus=0) limit 0,10;
# Time: 2018-01-05T18:44:46.543399Z
# User@Host: root[root] @  [39.106.78.43]  Id:    92
# Query_time: 14.546881  Lock_time: 0.000124 Rows_sent: 10  Rows_examined: 10
SET timestamp=1515177886;
select  *  from symphony_article where (articleRandomDouble>=0.0 and articleRandomDouble<=0.21861146510702367 and articleStatus=0) limit 0,10;
# Time: 2018-01-05T18:44:54.518877Z
# User@Host: root[root] @  [39.106.78.43]  Id:    85
# Query_time: 60.059722  Lock_time: 0.000073 Rows_sent: 10  Rows_examined: 10
SET timestamp=1515177894;
select  *  from symphony_article where (articleRandomDouble>=0.0 and articleRandomDouble<=0.060243983404944634 and articleStatus=0) limit 0,10;
# Time: 2018-01-05T18:44:58.642866Z
# User@Host: root[root] @  [39.106.78.43]  Id:    63
# Query_time: 6.031573  Lock_time: 0.000077 Rows_sent: 10  Rows_examined: 10
SET timestamp=1515177898;
select  *  from symphony_article where (articleRandomDouble>=0.0 and articleRandomDouble<=0.08719545215588231 and articleStatus=0) limit 0,10;

Sym
Sym 是一款用 Java 实现的现代化社区（论坛/BBS/社交网络/博客）系统平台。

下一代的社区系统，为未来而构建
- Sym 安装指南
- 客户端 API 文档
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性能

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mobdev 6 年前北京位置

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对 sym 100 压测，后台已经各种抛出错误，无法运转了

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我们正在构建一个小众社区，大家在这里相互信任，以平等 • 自由 • 奔放的价值观进行分享交流。最终，希望大家能够找到与自己志同道合的伙伴，共同成长。

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来自帝都的羊，技术公众号：架构师小秘圈北京

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