org.firebirdsql.jdbc.FBSQLException: GDS Exception. invalid transaction handle (expecting explicit transaction start)
	at org.firebirdsql.jdbc.FBStatement.executeQuery(FBStatement.java:156)
	at imaginart.Transaccio.getTipusProducte(Transaccio.java:880)
	at /especificacionsPrincipalsProducteLlista.jsp._jspService(/especificacionsPrincipalsProducteLlista.jsp.java:31) (JSP page line 3)
	at com.orionserver[Orion/2.0.7 (build 11273)].http.OrionHttpJspPage.service(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._ay._rkb(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)].server.http.JSPServlet.service(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._csb._pvd(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._csb.include(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._dnb.include(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)].server.http.EvermindPageContext.include(Unknown Source)
	at /llistatProductesPerMarca.jsp._jspService(/llistatProductesPerMarca.jsp.java:576)
	at com.orionserver[Orion/2.0.7 (build 11273)].http.OrionHttpJspPage.service(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._ay._rkb(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)].server.http.JSPServlet.service(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._csb._pvd(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._csb._boc(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._ax._lsc(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._ax._uab(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._bf.run(Unknown Source)
at org.firebirdsql.gds.GDSException: invalid transaction handle (expecting explicit transaction start)
	at org.firebirdsql.jgds.GDS_Impl.isc_dsql_prepare(GDS_Impl.java:1136)
	at org.firebirdsql.jca.FBManagedConnection.prepareSQL(FBManagedConnection.java:767)
	at org.firebirdsql.jdbc.FBConnection.prepareSQL(FBConnection.java:1110)
	at org.firebirdsql.jdbc.FBStatement.prepareFixedStatement(FBStatement.java:998)
	at org.firebirdsql.jdbc.FBStatement.internalExecute(FBStatement.java:986)
	at org.firebirdsql.jdbc.FBStatement.executeQuery(FBStatement.java:140)
	at imaginart.Transaccio.getTipusProducte(Transaccio.java:880)
	at /especificacionsPrincipalsProducteLlista.jsp._jspService(/especificacionsPrincipalsProducteLlista.jsp.java:31) (JSP page line 3)
	at com.orionserver[Orion/2.0.7 (build 11273)].http.OrionHttpJspPage.service(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._ay._rkb(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)].server.http.JSPServlet.service(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._csb._pvd(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._csb.include(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._dnb.include(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)].server.http.EvermindPageContext.include(Unknown Source)
	at /llistatProductesPerMarca.jsp._jspService(/llistatProductesPerMarca.jsp.java:576)
	at com.orionserver[Orion/2.0.7 (build 11273)].http.OrionHttpJspPage.service(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._ay._rkb(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)].server.http.JSPServlet.service(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._csb._pvd(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._csb._boc(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._ax._lsc(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._ax._uab(Unknown Source)
	at com.evermind[Orion/2.0.7 (build 11273)]._bf.run(Unknown Source)