NullPointerException when executing any workflow
When any workflows is executed an NullPointerException error always raises.
JBPM tables have not been created correctly during the first startup process. JBPM no longer supports HSQLDB ( Hypersonic database).
Check if tables with name starting with JBPM_* exists in your database.
You must switch to another database ( MySQL, PostgreSQL, Oracle, SQL Server, etc. ) which work properly with JBPM.