ConcurrentModificationException generating schemas in multithreaded environment

[idelvall]

java.lang.RuntimeException: org.brutusin.com.fasterxml.jackson.databind.JsonMappingException: (was java.util.ConcurrentModificationException) (through reference chain: org.brutusin.json.impl.["properties"])
    at org.brutusin.json.impl.JacksonCodec.getSchemaString(JacksonCodec.java:223)
    at org.brutusin.json.spi.JsonCodec.getSchema(JsonCodec.java:69)
    at org.brutusin.rpc.http.RpcServlet.execute(RpcServlet.java:372)
    at org.brutusin.rpc.http.RpcServlet.execute(RpcServlet.java:401)
    at org.brutusin.rpc.http.RpcServlet.doPost(RpcServlet.java:213)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:344)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
    at org.glassfish.tyrus.servlet.TyrusServletFilter.doFilter(TyrusServletFilter.java:295)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:316)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:415)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:282)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:201)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:175)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:561)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.brutusin.com.fasterxml.jackson.databind.JsonMappingException: (was java.util.ConcurrentModificationException) (through reference chain: org.brutusin.json.impl.["properties"])
    at org.brutusin.com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:210)
    at org.brutusin.com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:177)
    at org.brutusin.com.fasterxml.jackson.databind.ser.std.StdSerializer.wrapAndThrow(StdSerializer.java:199)
    at org.brutusin.com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:683)
    at org.brutusin.com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeWithType(BeanSerializerBase.java:566)
    at org.brutusin.com.fasterxml.jackson.databind.ser.impl.TypeWrappedSerializer.serialize(TypeWrappedSerializer.java:32)
    at org.brutusin.com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:130)
    at org.brutusin.com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:3554)
    at org.brutusin.com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(ObjectMapper.java:2925)
    at org.brutusin.json.impl.JacksonCodec.getSchemaString(JacksonCodec.java:221)
    ... 39 more
Caused by: java.util.ConcurrentModificationException
    at java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:711)
    at java.util.LinkedHashMap$LinkedEntryIterator.next(LinkedHashMap.java:744)
    at java.util.LinkedHashMap$LinkedEntryIterator.next(LinkedHashMap.java:742)
    at org.brutusin.com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeTypedFields(MapSerializer.java:762)
    at org.brutusin.com.fasterxml.jackson.databind.ser.std.MapSerializer.serializeFields(MapSerializer.java:524)
    at org.brutusin.com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:469)
    at org.brutusin.com.fasterxml.jackson.databind.ser.std.MapSerializer.serialize(MapSerializer.java:29)
    at org.brutusin.com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:693)
    at org.brutusin.com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:675)
    ... 45 more
]]

[ca2ju3]

Hey, Has the problem been solved? Now I have the same issue in my project.

[idelvall]

It is not actually solved, but the schema caching introduced in brutusin/json@c88334b
avoids the problem.

For your case, as you are using Brutusin-RPC: use at least version 1.2.7

[idelvall]

I have just released version 1.3.0 of Brutusin-RPC. You better use this last version