In java.sql.Types, value -1 corresponds to LONGVARCHAR. Properties of type
org.jbpm.bpel.db.type.ElementType in jBPM BPEL use that JDBC type. HSQL and MySQL support
it but not Oracle, apparently.
The solution is changing the JDBC type to VARCHAR. I've created issue BPEL-230 for
tracking purposes. I will describe a workaround there.
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