play_java_starter_example: net::ERR_CONNECTION_RESET in public assets.

[Hugo Play]

Hi guys!

I've downloaded your starter example for Play Java (play_java_starter_example).

The server seems to be up and running according to the console: [info] play.api.Play - Application started (Dev)

However when I try to navigate to localhost:9000 the content takes too long to load and I'm finding ERR_CONNECTION_RESET issues(which explains why it is taking so long).

>In Chrome the html content is loaded, but main.css, hello.js and favicon.ico are reporting ERR_CONNECTION_RESET in Chrome Developer Tool:

GET http://localhost:9000/assets/javascripts/hello.js net::ERR_CONNECTION_RESET localhost/:13 

GET http://localhost:9000/assets/stylesheets/main.css net::ERR_CONNECTION_RESET localhost/:11

GET http://localhost:9000/assets/images/favicon.png net::ERR_CONNECTION_RESET :9000/assets/images/favicon.png:1

The Network tab of the Chrome Developer Tool is showing me that:

main.css, Timing: Stalled, 2.6 min

hello.js, Timing: Stalled,1.3 min.

>In IE the html content is not even loaded.

Full console log:

E:\Play\play-java-starter-example>.\sbt-dist\bin\sbt.bat run

Java HotSpot(TM) 64-Bit Server VM warning: Ignoring option MaxPermSize; support was removed in 8.0

[info] Loading settings from plugins.sbt ...

[info] Loading project definition from E:\Play\play-java-starter-example\project

[info] Loading settings from build.sbt ...

[info] Set current project to play-java-starter-example (in build file:/E:/Play/play-java-starter-example/)

WARNING: An illegal reflective access operation has occurred

WARNING: Illegal reflective access by play.runsupport.classloader.DelegatingClassLoader (file:/C:/Users/user/.ivy2/cache/com.typesafe.play/run-support_2.12/jars/run-support_2.12-2.6.6.jar) to method java.lang.ClassLoader.findResource(java.lang.String)

WARNING: Please consider reporting this to the maintainers of play.runsupport.classloader.DelegatingClassLoader

WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations

WARNING: All illegal access operations will be denied in a future release

--- (Running the application, auto-reloading is enabled) ---

[info] p.c.s.AkkaHttpServer - Listening for HTTP on /0:0:0:0:0:0:0:0:9000

(Server started, use Enter to stop and go back to the console...)

[info] application - ApplicationTimer demo: Starting application at 2017-11-05T08:36:39.546604900Z

[info] p.a.h.EnabledFilters - Enabled Filters (see <https://www.playframework.com/documentation/latest/Filters>):

    play.filters.csrf.CSRFFilter

    play.filters.headers.SecurityHeadersFilter

    play.filters.hosts.AllowedHostsFilter

    filters.ExampleFilter

[info] play.api.Play - Application started (Dev)

Any ideas? Thanks!

[Hugo Play]

So I answer myself, 

Just uninstalling Java 9 and installing Java 8 seemed to make it work.

[Robbie Smith]

I installed Java 8, but I got this warning: UnsupportedClassVersionError: Module has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0

Seems like the Play example was done in JAVA 9. How were you able to make it work in 8?

[Igmar Palsenberg]

Op donderdag 9 november 2017 21:19:13 UTC+1 schreef Robbie Smith:

I installed Java 8, but I got this warning: UnsupportedClassVersionError: Module has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0

Seems like the Play example was done in JAVA 9. How were you able to make it work in 8?

sbt clean cleanFiles compile should do it. Else show a full stacktrace, that should tell which class is affected.

Igmar