[wildfly-dev] jdk 9 reflection problem

[David M. Lloyd]

I guess the obvious suggestion is, report a bug to XStream and tell them 
to use the comparator() method on TreeMap instead of poking the field.

Reflecting on JDK classes is going to become pretty hard in Java 9 
without using Unsafe.

On 01/05/2017 06:04 AM, Michael Musgrove wrote:
> We have just upgraded our jdk build to 9-ea+149 which has tightened up
> the accessibility rules. The recommendation seems to be to use the
> --add-opens flag to override the rules.
>
> I tried export MAVEN_OPTS="--add-opens java.base/java.util=ALL-UNNAMED"
> which made no difference. Our jdk 9 FAQ does not provided any hints either.
>
> Can anyone provide advice on how to resolve the following maven build error:
>
>
> [WARNING] Error injecting: org.apache.maven.plugins.war.WarMojo
> com.google.inject.ProvisionException: Unable to provision, see the
> following errors:
>
> 1) Error injecting constructor, java.lang.ExceptionInInitializerError
>   at org.apache.maven.plugins.war.WarMojo.<init>(Unknown Source)
>   while locating org.apache.maven.plugins.war.WarMojo
>
> ...
>
> Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make
> field private final java.util.Comparator java.util.TreeMap.comparator
> accessible: module java.base does not "opens java.util" to unnamed m
> odule @669f2128
>         at
> java.base/jdk.internal.reflect.Reflection.throwInaccessibleObjectException(Reflection.java:427)
>         at
> java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:201)
>         at
> java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:171)
>         at java.base/java.lang.reflect.Field.setAccessible(Field.java:165)
>         at com.thoughtworks.xstream.core.util.Fields.locate(Fields.java:40)
>         at
> com.thoughtworks.xstream.converters.collections.TreeMapConverter.<clinit>(TreeMapConverter.java:50)
>
>
> --
> Michael Musgrove
> Transactions Team
> e: mmusgrov at redhat.com <mailto:mmusgrov at redhat.com>
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