Multi threaded exception when using request transformation

[Vysci]

If you create a request transformation, at least for "all" injection point (not sure about other injections points) and then send bunch of concurrent requests ie using seq 1 20 | xargs -n1 -P5 <curl command here> some requests will result in the following exception:

java.util.concurrent.CompletionException: java.lang.RuntimeException: java.lang.IllegalStateException: Multi threaded access requested by thread Thread[reactor-http-epoll-4,5,main] but is not allowed for language(s) js.
	at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:315) ~[na:na]
	at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:320) ~[na:na]
	at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1159) ~[na:na]
	at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510) ~[na:na]
	at java.base/java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:2147) ~[na:na]
	at ai.diffy.util.Future.lambda$assign$0(Future.java:12) ~[classes!/:1.0.0-SNAPSHOT]
	at java.base/java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:863) ~[na:na]
	at java.base/java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:841) ~[na:na]
	at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510) ~[na:na]
	at java.base/java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:2147) ~[na:na]
	at reactor.core.publisher.MonoToCompletableFuture.onNext(MonoToCompletableFuture.java:64) ~[reactor-core-3.4.22.jar!/:3.4.22]
	at reactor.core.publisher.FluxHandle$HandleSubscriber.onNext(FluxHandle.java:126) ~[reactor-core-3.4.22.jar!/:3.4.22]
	at reactor.core.publisher.FluxMap$MapConditionalSubscriber.onNext(FluxMap.java:224) ~[reactor-core-3.4.22.jar!/:3.4.22]
	at reactor.core.publisher.FluxDoFinally$DoFinallySubscriber.onNext(FluxDoFinally.java:113) ~[reactor-core-3.4.22.jar!/:3.4.22]
	at reactor.core.publisher.FluxHandleFuseable$HandleFuseableSubscriber.onNext(FluxHandleFuseable.java:191) ~[reactor-core-3.4.22.jar!/:3.4.22]
	at reactor.core.publisher.FluxContextWrite$ContextWriteSubscriber.onNext(FluxContextWrite.java:107) ~[reactor-core-3.4.22.jar!/:3.4.22]
	at reactor.core.publisher.Operators$MonoSubscriber.complete(Operators.java:1816) ~[reactor-core-3.4.22.jar!/:3.4.22]
	at reactor.core.publisher.MonoCollectList$MonoCollectListSubscriber.onComplete(MonoCollectList.java:129) ~[reactor-core-3.4.22.jar!/:3.4.22]
	at reactor.core.publisher.FluxPeek$PeekSubscriber.onComplete(FluxPeek.java:260) ~[reactor-core-3.4.22.jar!/:3.4.22]
	at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:144) ~[reactor-core-3.4.22.jar!/:3.4.22]
	at reactor.netty.channel.FluxReceive.onInboundComplete(FluxReceive.java:400) ~[reactor-netty-core-1.0.22.jar!/:1.0.22]
	at reactor.netty.channel.ChannelOperations.onInboundComplete(ChannelOperations.java:419) ~[reactor-netty-core-1.0.22.jar!/:1.0.22]
	at reactor.netty.http.server.HttpServerOperations.onInboundNext(HttpServerOperations.java:600) ~[reactor-netty-http-1.0.22.jar!/:1.0.22]
	at reactor.netty.channel.ChannelOperationsHandler.channelRead(ChannelOperationsHandler.java:93) ~[reactor-netty-core-1.0.22.jar!/:1.0.22]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.79.Final.jar!/:4.1.79.Final]
	at reactor.netty.http.server.HttpTrafficHandler.channelRead(HttpTrafficHandler.java:258) ~[reactor-netty-http-1.0.22.jar!/:1.0.22]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436) ~[netty-transport-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:327) ~[netty-codec-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:299) ~[netty-codec-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251) ~[netty-transport-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) ~[netty-transport-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) ~[netty-transport-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) ~[netty-transport-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) ~[netty-transport-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) ~[netty-transport-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:800) ~[netty-transport-classes-epoll-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe$1.run(AbstractEpollChannel.java:425) ~[netty-transport-classes-epoll-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174) ~[netty-common-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167) ~[netty-common-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470) ~[netty-common-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:391) ~[netty-transport-classes-epoll-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.79.Final.jar!/:4.1.79.Final]
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-common-4.1.79.Final.jar!/:4.1.79.Final]
	at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]
Caused by: java.lang.RuntimeException: java.lang.IllegalStateException: Multi threaded access requested by thread Thread[reactor-http-epoll-4,5,main] but is not allowed for language(s) js.
	at ai.diffy.functional.algebra.UnsafeFunction.lambda$suppressThrowable$2(UnsafeFunction.java:25) ~[classes!/:1.0.0-SNAPSHOT]
	at java.base/java.util.function.Function.lambda$compose$0(Function.java:68) ~[na:na]
	at ai.diffy.functional.endpoints.Endpoint.apply(Endpoint.java:28) ~[classes!/:1.0.0-SNAPSHOT]
	at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1150) ~[na:na]
	... 49 common frames omitted
Caused by: java.lang.IllegalStateException: Multi threaded access requested by thread Thread[reactor-http-epoll-4,5,main] but is not allowed for language(s) js.
	at com.oracle.truffle.polyglot.PolyglotEngineException.illegalState(PolyglotEngineException.java:129) ~[truffle-api-21.2.0.jar!/:na]
	at com.oracle.truffle.polyglot.PolyglotContextImpl.throwDeniedThreadAccess(PolyglotContextImpl.java:1075) ~[truffle-api-21.2.0.jar!/:na]
	at com.oracle.truffle.polyglot.PolyglotContextImpl.checkAllThreadAccesses(PolyglotContextImpl.java:933) ~[truffle-api-21.2.0.jar!/:na]
	at com.oracle.truffle.polyglot.PolyglotContextImpl.enterThreadChanged(PolyglotContextImpl.java:789) ~[truffle-api-21.2.0.jar!/:na]
	at com.oracle.truffle.polyglot.PolyglotEngineImpl.enter(PolyglotEngineImpl.java:1815) ~[truffle-api-21.2.0.jar!/:na]
	at com.oracle.truffle.polyglot.HostToGuestRootNode.execute(HostToGuestRootNode.java:110) ~[truffle-api-21.2.0.jar!/:na]
	at com.oracle.truffle.api.impl.DefaultCallTarget.callDirectOrIndirect(DefaultCallTarget.java:85) ~[truffle-api-21.2.0.jar!/:na]
	at com.oracle.truffle.api.impl.DefaultCallTarget.call(DefaultCallTarget.java:102) ~[truffle-api-21.2.0.jar!/:na]
	at com.oracle.truffle.api.impl.DefaultRuntimeAccessor$DefaultRuntimeSupport.callProfiled(DefaultRuntimeAccessor.java:124) ~[truffle-api-21.2.0.jar!/:na]
	at com.oracle.truffle.polyglot.PolyglotValueDispatch$InteropValue.execute(PolyglotValueDispatch.java:2345) ~[truffle-api-21.2.0.jar!/:na]
	at org.graalvm.polyglot.Value.execute(Value.java:830) ~[graal-sdk-21.2.0.jar!/:na]
	at ai.diffy.interpreter.Lambda.lambda$new$1(Lambda.java:36) ~[classes!/:1.0.0-SNAPSHOT]
	at ai.diffy.functional.algebra.UnsafeFunction.lambda$andThen$1(UnsafeFunction.java:17) ~[classes!/:1.0.0-SNAPSHOT]
	at ai.diffy.functional.algebra.UnsafeFunction.lambda$andThen$1(UnsafeFunction.java:17) ~[classes!/:1.0.0-SNAPSHOT]
	at ai.diffy.functional.algebra.UnsafeFunction.lambda$andThen$1(UnsafeFunction.java:17) ~[classes!/:1.0.0-SNAPSHOT]
	at ai.diffy.functional.algebra.UnsafeFunction.lambda$andThen$1(UnsafeFunction.java:17) ~[classes!/:1.0.0-SNAPSHOT]
	at ai.diffy.interpreter.Lambda.apply(Lambda.java:46) ~[classes!/:1.0.0-SNAPSHOT]
	at ai.diffy.functional.algebra.UnsafeFunction.lambda$suppressThrowable$2(UnsafeFunction.java:23) ~[classes!/:1.0.0-SNAPSHOT]
	... 52 common frames omitted
Caused by: com.oracle.truffle.api.TruffleStackTrace$LazyStackTrace: null