doctording opened a new issue #8735: com.sun.jersey.api.MessageException when set worker select strategy of javascript URL: https://github.com/apache/incubator-druid/issues/8735 druid version: 0.12.3 I want use "javascript" as my worker select strategy, so set `druid.javascript.enabled = true` and send a post request to overlord, eg:  then exception in overlord.log ```java 2019-10-24T22:05:25,683 ERROR [qtp1639341396-104] com.sun.jersey.spi.container.ContainerResponse - Mapped exception to response: 500 (Internal Server Error) javax.ws.rs.WebApplicationException: com.sun.jersey.api.MessageException: A message body writer for Java class com.google.common.collect.SingletonImmutableBiMap, and Java type class com.google.common.collect.SingletonImmutableBiMap, and MIME media type application/octet-stream was not found. at com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:284) [jersey-server-1.19.3.jar:1.19.3] at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1510) [jersey-server-1.19.3.jar:1.19.3] at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419) [jersey-server-1.19.3.jar:1.19.3] at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409) [jersey-server-1.19.3.jar:1.19.3] at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409) [jersey-servlet-1.19.3.jar:1.19.3] at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:558) [jersey-servlet-1.19.3.jar:1.19.3] at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:733) [jersey-servlet-1.19.3.jar:1.19.3] at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) [javax.servlet-api-3.1.0.jar:3.1.0] at com.google.inject.servlet.ServletDefinition.doServiceImpl(ServletDefinition.java:286) [guice-servlet-4.1.0.jar:?] at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:276) [guice-servlet-4.1.0.jar:?] at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:181) [guice-servlet-4.1.0.jar:?] at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91) [guice-servlet-4.1.0.jar:?] at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:85) [guice-servlet-4.1.0.jar:?] at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:120) [guice-servlet-4.1.0.jar:?] at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:135) [guice-servlet-4.1.0.jar:?] at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.10.v20180503.jar:9.4.10.v20180503] at io.druid.server.http.RedirectFilter.doFilter(RedirectFilter.java:72) [druid-server-0.12.3-iap7.jar:0.12.3-iap7] at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.10.v20180503.jar:9.4.10.v20180503] at io.druid.server.security.PreResponseAuthorizationCheckFilter.doFilter(PreResponseAuthorizationCheckFilter.java:84) [druid-server-0.12.3-iap7.jar:0.12.3-iap7] at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.10.v20180503.jar:9.4.10.v20180503] at io.druid.server.security.AllowOptionsResourceFilter.doFilter(AllowOptionsResourceFilter.java:76) [druid-server-0.12.3-iap7.jar:0.12.3-iap7] at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.10.v20180503.jar:9.4.10.v20180503] at io.druid.server.security.AllowAllAuthenticator$1.doFilter(AllowAllAuthenticator.java:85) [druid-server-0.12.3-iap7.jar:0.12.3-iap7] at io.druid.server.security.AuthenticationWrappingFilter.doFilter(AuthenticationWrappingFilter.java:60) [druid-server-0.12.3-iap7.jar:0.12.3-iap7] at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.10.v20180503.jar:9.4.10.v20180503] at io.druid.server.security.SecuritySanityCheckFilter.doFilter(SecuritySanityCheckFilter.java:88) [druid-server-0.12.3-iap7.jar:0.12.3-iap7] at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1642) [jetty-servlet-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533) [jetty-servlet-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473) [jetty-servlet-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:724) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:61) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.server.Server.handle(Server.java:531) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:352) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260) [jetty-server-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:281) [jetty-io-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:102) [jetty-io-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118) [jetty-io-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333) [jetty-util-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310) [jetty-util-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168) [jetty-util-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126) [jetty-util-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366) [jetty-util-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:760) [jetty-util-9.4.10.v20180503.jar:9.4.10.v20180503] at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:678) [jetty-util-9.4.10.v20180503.jar:9.4.10.v20180503] at java.lang.Thread.run(Thread.java:745) [?:1.8.0_102] ```
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