Can you please log it? Link it to 
https://issues.apache.org/jira/browse/CALCITE-4200 
<https://issues.apache.org/jira/browse/CALCITE-4200> (if it’s not the same 
issue) and of course FLINK-19820.

> On Feb 9, 2021, at 8:28 AM, Ruben Q L <[email protected]> wrote:
> 
> Hello everyone,
> 
> While testing an application that uses Calcite, I'm getting an error when I
> try to run it on a Websphere9 environment (IBM J9 VM, Java8, Ubuntu) [1].
> It would seem there is an issue around
> org.apache.calcite.util.ImmutableBeans and the reflection mechanisms that
> it uses, in the context of RelRule#Config (and specifically the default
> method RelRule$Config.as).
> 
> Googling a bit, I found the following Flink ticket:
> https://issues.apache.org/jira/browse/FLINK-19820
> which has a very similar exception message. In that case it was seen with
> Java9 in a Debian environment, and the problem is also around
> ImmutableBeans in RelBuilder#Config, and again the issue seems generated by
> a default method (RelBuilder$Config.toBuilder).
> The Flink ticket was closed as "Won't Fix" just because Flink does not
> support Java9 (and apparently the issue did not occur with the
> Flink-supported Java versions), but the underlying Calcite problem was
> never tackled.
> 
> Even if Flink does not support Java9, Calcite does, right? Moreover, in my
> case I get the error with Java8 (only in WebSphere). So I guess we have a
> potential issue on our side.
> Has anyone ever seen this problem before?
> 
> Best regards,
> Ruben
> 
> 
> [1]
> Caused by: java.lang.ExceptionInInitializerError
>    at java.lang.J9VMInternals.ensureError(J9VMInternals.java:141)
>    at
> java.lang.J9VMInternals.recordInitializationFailure(J9VMInternals.java:130)
> ...
> Caused by: java.lang.RuntimeException: while binding method public default
> java.lang.Object
> com.onwbp.org.apache.calcite.plan.RelRule$Config.as(java.lang.Class)
>    at
> com.onwbp.org.apache.calcite.util.ImmutableBeans.makeDef(ImmutableBeans.java:285)
>    at
> com.onwbp.org.apache.calcite.util.ImmutableBeans.access$000(ImmutableBeans.java:51)
>    at
> com.onwbp.org.apache.calcite.util.ImmutableBeans$1.load(ImmutableBeans.java:64)
>    at
> com.onwbp.org.apache.calcite.util.ImmutableBeans$1.load(ImmutableBeans.java:61)
>    at
> com.onwbp.com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3529)
>    at
> com.onwbp.com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2278)
>    at
> com.onwbp.com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2155)
>    at
> com.onwbp.com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2045)
>    at
> com.onwbp.com.google.common.cache.LocalCache.get(LocalCache.java:3951)
>    at
> com.onwbp.com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3974)
>    at
> com.onwbp.com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4958)
>    at
> com.onwbp.org.apache.calcite.util.ImmutableBeans.create_(ImmutableBeans.java:91)
>    at
> com.onwbp.org.apache.calcite.util.ImmutableBeans.create(ImmutableBeans.java:72)
>    at
> com.onwbp.org.apache.calcite.plan.RelRule$Config.<clinit>(RelRule.java:121)
> <Break in method call trace.>
> ... 73 more
> Caused by: java.lang.IllegalAccessException:
> 'com.onwbp.org.apache.calcite.plan.RelRule$Config' no access to:
> 'com.onwbp.org.apache.calcite.plan.RelRule$Config.as:(Config,Class)Object/invokeSpecial'
>    at
> java.lang.invoke.MethodHandles$Lookup.checkAccess(MethodHandles.java:333)
>    at
> java.lang.invoke.MethodHandles$Lookup.unreflectSpecial(MethodHandles.java:970)
>    at
> com.onwbp.org.apache.calcite.util.ImmutableBeans.makeDef(ImmutableBeans.java:283)
> ... 86 more

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