[wildfly-dev] jdk 9 reflection problem

[Michael Musgrove]

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
t: +44 191 243 0870

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