problem with pgjdbc prepared statements and new jsonb exists operator (?)

Hello,

I'm testing out the new jsonb functionality in Postgresql 9.4 and ran
across an issue with some of the newly introduced operators for the jsonb
datatype described here (
http://www.postgresql.org/docs/9.4/static/functions-json.html#FUNCTIONS-JSONB-OP-TABLE)
when used with JDBC prepared statements.

I have created the following table:

create table "JsonTest0" ("id" BIGSERIAL NOT NULL PRIMARY KEY,"json" jsonb
DEFAULT ' {"a":"v1","b":2} ' NOT NULL)

When I'm creating and executing a simple statement using the exist operator
then I get expected results back:

connection.createStatement.executeQuery("select x2.\"json\" from
\"JsonTest0\" x2 where (x2.\"json\" ? 'c') = true")

When I try to execute the same query using a prepared statement, I get the
following:

connection.prepareStatement("select x2.\"json\" from \"JsonTest0\" x2 where
(x2.\"json\" ? 'c') = true").executeQuery()

org.postgresql.util.PSQLException: No value specified for parameter 1.
at
org.postgresql.core.v3.SimpleParameterList.checkAllParametersSet(SimpleParameterList.java:216)
at
org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:244)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:560)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:417)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:302)

So it looks like the ? character, which is used as the jsonb exists
operator is confusing the prepared statement parser, which treats it as a
parameter substitution instead.

Is this expected behaviour and am I stuck with non-prepared statements when
using the new ?, ?& and ?| jsonb operators ?
Any other workarounds, like escaping or function aliases that you may know
of ?

I tested with both: 9.3-1100-jdbc41 and 9.4-1200-jdbc41-SNAPSHOT versions

BR,

Peter Mortier