Uploaded image for project: 'Groovy'
  1. Groovy
  2. GROOVY-9802

groovy json - Unable to load FastStringService with java 11 http client



    • Bug
    • Status: Open
    • Major
    • Resolution: Unresolved
    • 3.0.6
    • None
    • JSON
    • None
    • Groovy Version: 3.0.6 JVM: 11.0.9 Vendor: Amazon.com Inc. OS: Linux


      The following code: 

      import groovy.json.*
      import java.net.http.*
      import static java.net.http.HttpResponse.*
      def req = HttpRequest.newBuilder()
      def parser = new JsonSlurper()
      // parser.parseText('{}') // <--- commenting in this line will make the code work
      def res = HttpClient.newHttpClient().sendAsync(req, BodyHandlers.ofString())
             .thenApply(r -> r.body())
      println "response: $res"

      when run, will break with the following exception: 

      ─➤ groovy queryjson.groovy                                                                                           
      Caught: java.util.concurrent.CompletionException: java.lang.RuntimeException: Unable to load FastStringService
      java.util.concurrent.CompletionException: java.lang.RuntimeException: Unable to load FastStringService
      Caused by: java.lang.RuntimeException: Unable to load FastStringService
        at org.apache.groovy.json.internal.FastStringUtils.getService(FastStringUtils.java:56)
        at org.apache.groovy.json.internal.FastStringUtils.toCharArray(FastStringUtils.java:66)
        at org.apache.groovy.json.internal.BaseJsonParser.parse(BaseJsonParser.java:113)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at com.sun.proxy.$Proxy17.apply(Unknown Source)

      commenting in the indicated line will make the code work. 

      I assume this is caused by the fact that the `thenApply` block of code is run from a different (pooled) thread and from a different classloader context.

      I get this, but in my mind having this simple example break is bad ergonomics and with the ubiquity of json APIs and the inclusion of a decent http client in java 11 I would expect this pattern to become quite common. I.e. wanting to create a no-deps groovy script / class which makes an http call and parses the returned json. 





            Unassigned Unassigned
            mbjarland Matias Bjarland
            0 Vote for this issue
            5 Start watching this issue