Absolutely *everything* involved-- all the source code, all the mapping files, all the error messages, all the hql, and all the SQL-- is already there in my first post. There's nothing else to it. It's very simple to reproduce. If anyone thinks it's relevant, the build file and hibernate.cfg.xml files are below. That is absolutely everything used to produce this exception.
====hibernate.cfg.xml
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">org.postgresql.Driver</propert\y>
<property name="connection.url">jdbc:postgresql:data</property>
<property name="connection.username">postgres</property>
<property name="connection.password"></property>
<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>
<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.PostgreSQLDialect</prope\rty>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<!-- Drop and re-create the database schema on startup -->
<property name="hbm2ddl.auto">update</property>
<mapping resource="Container.hbm.xml"/>
<mapping resource="Implementer.hbm.xml"/>
</session-factory>
</hibernate-configuration>
==build.xml
<project name="test" default="compile">
<property name="sourcedir" value="${basedir}/src"/>
<property name="targetdir" value="${basedir}/bin"/>
<property name="librarydir" value="${basedir}/lib"/>
<path id="libraries">
<fileset dir="${librarydir}">
<include name="*.jar"/>
</fileset>
</path>
<target name="clean">
<delete dir="${targetdir}"/>
<mkdir dir="${targetdir}"/>
</target>
<target name="compile" depends="clean, copy-resources">
<javac compiler="jikes"
debug="yes"
srcdir="${sourcedir}"
destdir="${targetdir}"
classpathref="libraries"/>
</target>
<target name="copy-resources">
<copy todir="${targetdir}">
<fileset dir="${sourcedir}">
<exclude name="**/*.java"/>
</fileset>
</copy>
</target>
<target name="run" depends="compile">
<java fork="true" classname="Test" classpathref="libraries">
<classpath path="${targetdir}"/>
<jvmarg value="-Dhibernate.connection.isolation=8"/>
<jvmarg value="-Xdebug"/>
</java>
</target>
</project>
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