• Issue number: #38
• Primary method: net.splitcells.website.server.Server.serveToHttpAt

Task Description

If multiple ProjectsRenderer are created and each used by a dedicated thread, then these ProjectsRenderers still have problems with each other's thread.

The basis for the webserver thread safety was created here. This issue is part of "Solve sport lesson assignment".

Tasks

• [x] Multithreaded webserver sometimes has random errors, when optimization problems are submitted via the editors.
  • [x] The Whole XML class needs to be removed, as it is not thread safe. See "Create minimal Java grammar.".#
    • [x] Blog about the fact that the XML of Java used incorrectly, because of arrogance.
  • [x] Try improving the multithreaded webserver by trying an experimental handler fix for the multipart-bodies of forms: Use end handler and body handler by nesting these. -> It now works.
  • [o] Only expect multipart, if the request is not read yet: if (!routingContext.request().isEnded()) { routingContext.request().setExpectMultipart(true);}. See Multipart Exception. -> Multipart works now.
  • [o] When multi threading is enabled, forms are not executed in parallel. -> The handler of the router needs to be a blocking handler. executeBlocking does not to execute a request in a worker thread.
  • [x] BinaryProcessor does not execute requests in parallel. -> A synchronized modifier caused a problem.
  • [x] Use .useNormalizedPath(true).

Conclusions

Its hard for me to understand the Vert.x doc, which caused many misunderstandings and pain.

Multipart Exception

19:43:16.303 [vert.x-eventloop-thread-0] DEBUG io.vertx.ext.web.RoutingContext -- RoutingContext failure (500)
java.lang.IllegalStateException: Request has already been read
	at io.vertx.core.http.impl.Http1xServerRequest.checkEnded(Http1xServerRequest.java:671)
	at io.vertx.core.http.impl.Http1xServerRequest.setExpectMultipart(Http1xServerRequest.java:477)
	at io.vertx.core.http.impl.HttpServerRequestWrapper.setExpectMultipart(HttpServerRequestWrapper.java:254)
	at net.splitcells.website.server.Server$2$2.lambda$start$6(Server.java:177)
	at io.vertx.ext.web.impl.BlockingHandlerDecorator.lambda$handle$0(BlockingHandlerDecorator.java:48)
	at io.vertx.core.impl.ContextBase.lambda$null$0(ContextBase.java:137)
	at io.vertx.core.impl.ContextInternal.dispatch(ContextInternal.java:264)
	at io.vertx.core.impl.ContextBase.lambda$executeBlocking$1(ContextBase.java:135)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Thread.java:1583)