Warnings when using J11 and groovy3.0.0-alpha-3

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Warnings when using J11 and groovy3.0.0-alpha-3

Kerridge, Jon


I am using J11 latest Oracle build plus groovy 3.0.0-alpha-3.


The groovy test program is a simple print hello script


I am using Intellij with Gradle and the relevant parts of the build file are:


repositories {
    maven {

dependencies {
    compile 'org.codehaus.groovy:groovy:3.0.0-alpha-3'
compile group: 'javax.xml.bind', name: 'jaxb-api', version: '2.3.0'


The program works but I get a warning as follows:


"C:\Program Files\Java\jdk-11\bin\java.exe" "-Dtools.jar=C:\Program Files\Java\jdk-11\lib\tools.jar" -Dgroovy.home=C:\Users\Jon\.gradle\caches\modules-2\files-2.1\org.codehaus.groovy\groovy\3.0.0-alpha-3\81b3f93dc6c8cdecdca450c6d5326abe9ea28971 "-Dgroovy.starter.conf=C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2018.2.2\plugins\Groovy\lib\groovy-starter.conf" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2018.2.2\lib\idea_rt.jar=58513:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2018.2.2\bin" -Dfile.encoding=UTF-8 -classpath C:\Users\Jon\.gradle\caches\modules-2\files-2.1\org.codehaus.groovy\groovy\3.0.0-alpha-3\81b3f93dc6c8cdecdca450c6d5326abe9ea28971\groovy-3.0.0-alpha-3.jar org.codehaus.groovy.tools.GroovyStarter --conf "C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2018.2.2\plugins\Groovy\lib\groovy-starter.conf" --main groovy.ui.GroovyMain --classpath .;D:\IJTest\testj10g2.5.2\out\production\classes;C:\Users\Jon\.gradle\caches\modules-2\files-2.1\org.codehaus.groovy\groovy\3.0.0-alpha-3\81b3f93dc6c8cdecdca450c6d5326abe9ea28971\groovy-3.0.0-alpha-3.jar --encoding=UTF-8 D:\IJTest\testj10g2.5.2\src\main\groovy\test1.groovy

WARNING: An illegal reflective access operation has occurred

WARNING: Illegal reflective access by org.codehaus.groovy.vmplugin.v7.Java7$1 (file:/C:/Users/Jon/.gradle/caches/modules-2/files-2.1/org.codehaus.groovy/groovy/3.0.0-alpha-3/81b3f93dc6c8cdecdca450c6d5326abe9ea28971/groovy-3.0.0-alpha-3.jar) to constructor java.lang.invoke.MethodHandles$Lookup(java.lang.Class,int)

WARNING: Please consider reporting this to the maintainers of org.codehaus.groovy.vmplugin.v7.Java7$1

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

hello from test


Process finished with exit code 0


Where hello from test is what I was expecting!


Is this currently expected behaviour or is something amiss?


Jon Kerridge



From: Paul King <[hidden email]>
Sent: 14 August 2018 12:21
To: [hidden email]; [hidden email]
Subject: Re: Java 11 Compatibility check: Apache-groovy



On Tue, Aug 14, 2018 at 9:10 PM Dragan, Krzysztof <[hidden email]> wrote:


We are reaching out to you to check Java 11 compatibility of the library Apache-groovy


Could you help us by answering the following questions:


Col 1






Library name

Latest version

Is the library compatible with Java 11 Compatible?

Is the library supported with Java 11?


(If ā€œNā€ in compatibility or support)

What is the versions that would be compatible and Supported?

Date of support availability?

Apache Groovy

Stable: 2.5.2, Preliminary: 3.0.0-alpha-3

For 2.5, Groovy classes compiled with JDK10 should run on JDK11. Groovy 3.0 builds and all tests pass on JDK11 but further testing is required.

See previous answer.

See previous answer.

2.5.2 was released yesterday. Groovy 3.0.0 final doesn't have a set target date yet but isn't due in the next few months.


Appreciate your response by 17.08.2018



Krzysztof Dragan

PTC Inc. Contractor


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Re: Warnings when using J11 and groovy3.0.0-alpha-3

Hi Kerridge,

     You can set environment variable GROOVY_TURN_OFF_JAVA_WARNINGS to true
to avoid these warnings.

     Eliminating these warnings is one of tasks of groovy 3.0.0.


Daniel Sun
Apache Groovy committer
Blog: http://blog.sunlan.me 
Twitter: @daniel_sun

Sent from: http://groovy.329449.n5.nabble.com/Groovy-Dev-f372993.html
Apache Groovy committer

Blog: http://blog.sunlan.me
Twitter: @daniel_sun