Hey Mark,

Seems that there are more places that the problem occurs. Both in the new 2.12 and Beta 2.
Here are the traces:

BR,
Hugo

org.firebirdsql.jdbc.FBSQLException: GDS Exception. 335544332. invalid transaction handle (expecting explicit transaction start)
    at org.firebirdsql.jdbc.AbstractPreparedStatement.<init>(AbstractPreparedStatement.java:137)
    at org.firebirdsql.jdbc.FBPreparedStatement.<init>(FBPreparedStatement.java:45)
    at sun.reflect.GeneratedConstructorAccessor3.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.firebirdsql.jdbc.FBStatementFactory.createPreparedStatement(FBStatementFactory.java:89)
    at org.firebirdsql.jdbc.AbstractDatabaseMetaData.getStatement(AbstractDatabaseMetaData.java:6165)
    at org.firebirdsql.jdbc.AbstractDatabaseMetaData.doQuery(AbstractDatabaseMetaData.java:6205)
    at org.firebirdsql.jdbc.FBResultSetMetaData.getExtendedFieldInfo(FBResultSetMetaData.java:832)
    at org.firebirdsql.jdbc.FBResultSetMetaData.getExtFieldInfo(FBResultSetMetaData.java:681)
    at org.firebirdsql.jdbc.FBResultSetMetaData.getPrecision(FBResultSetMetaData.java:304)
    at com.borland.dx.sql.dataset.RuntimeMetaData.a(Unknown Source)
    at com.borland.dx.sql.dataset.JdbcProvider.b(Unknown Source)
    at com.borland.dx.sql.dataset.JdbcProvider.provideData(Unknown Source)
    at com.borland.dx.dataset.StorageDataSet.refresh(Unknown Source)
    at com.borland.dx.sql.dataset.QueryDataSet.refresh(Unknown Source)
    at advit.web.dxweb.MyQueryDataSet.execType(MyQueryDataSet.java:266)
    at advit.web.dxweb.MyQueryDataSet.myRefresh(MyQueryDataSet.java:241)
    at advit.web.dxweb.MyQueryDataSet.refresh(MyQueryDataSet.java:129)
    at advit.db.Sql$QUERY.refreshWithPool(Sql.java:284)
    at advit.db.Sql$QUERY.execQds(Sql.java:203)
    at advit.db.Sql$QUERY.execWithPool(Sql.java:234)
    at advit.report.DayReport.refreshSets(DayReport.java:172)
    at advit.report.DayReport.makeAlldays(DayReport.java:273)
    at advit.report.ReportSender.makeZ_alldays(ReportSender.java:191)
    at advit.report.ReportSender.makeReport(ReportSender.java:127)
    at advit.report.ReportSender.checkSend(ReportSender.java:83)
    at advit.report.ReportSender.send(ReportSender.java:46)
    at advit.report.ReportSender.<init>(ReportSender.java:36)
    at advit.MainTest$1.run(MainTest.java:186)
    at java.lang.Thread.run(Unknown Source)
Caused by: org.firebirdsql.gds.GDSException: invalid transaction handle (expecting explicit transaction start)
    at org.firebirdsql.gds.impl.wire.AbstractJavaGDSImpl.readStatusVector(AbstractJavaGDSImpl.java:2120)
    at org.firebirdsql.gds.impl.wire.AbstractJavaGDSImpl.receiveResponse(AbstractJavaGDSImpl.java:2070)
    at org.firebirdsql.gds.impl.wire.AbstractJavaGDSImpl.iscDsqlPrepare(AbstractJavaGDSImpl.java:1478)
    at org.firebirdsql.gds.impl.GDSHelper.prepareStatement(GDSHelper.java:214)
    at org.firebirdsql.jdbc.AbstractStatement.prepareFixedStatement(AbstractStatement.java:1388)
    at org.firebirdsql.jdbc.AbstractPreparedStatement.prepareFixedStatement(AbstractPreparedStatement.java:1268)
    at org.firebirdsql.jdbc.AbstractPreparedStatement.<init>(AbstractPreparedStatement.java:134)
    ... 30 more
   
..........................................................................................

org.firebirdsql.jdbc.FBSQLException: You cannot getAutoCommit on an unassociated closed connection.
    at org.firebirdsql.jdbc.AbstractConnection.getAutoCommit(AbstractConnection.java:445)
    at com.borland.dx.sql.dataset.Database.setJdbcConnection(Unknown Source)
    at advit.web.dxweb.MyQueryDataSet.setPoolconn(MyQueryDataSet.java:303)
    at advit.web.dxweb.MyQueryDataSet.execType(MyQueryDataSet.java:261)
    at advit.web.dxweb.MyQueryDataSet.myRefresh(MyQueryDataSet.java:237)
    at advit.web.dxweb.MyQueryDataSet.refresh(MyQueryDataSet.java:128)
........................................................................................

java.lang.NullPointerException
    at org.firebirdsql.jdbc.AbstractConnection.getDatabaseParameterBuffer(AbstractConnection.java:224)
    at org.firebirdsql.jdbc.FBResultSetMetaData.<init>(FBResultSetMetaData.java:61)
    at org.firebirdsql.jdbc.AbstractResultSet.getMetaData(AbstractResultSet.java:1025)
    at com.borland.dx.sql.dataset.RuntimeMetaData.a(Unknown Source)
    at com.borland.dx.sql.dataset.JdbcProvider.b(Unknown Source)
    at com.borland.dx.sql.dataset.JdbcProvider.provideData(Unknown Source)
    at com.borland.dx.dataset.StorageDataSet.refresh(Unknown Source)
    at com.borland.dx.sql.dataset.QueryDataSet.refresh(Unknown Source)
   
----------****-----------------------JayBird---3.0--------------*********---------------------------------------------

java.sql.SQLNonTransientException: No transaction or transaction not ACTIVE
    at org.firebirdsql.gds.ng.TransactionHelper.checkTransactionActive(TransactionHelper.java:49)
    at org.firebirdsql.gds.ng.wire.version11.V11Statement.prepare(V11Statement.java:57)
    at org.firebirdsql.jdbc.FBStatement.prepareFixedStatement(FBStatement.java:1399)
    at org.firebirdsql.jdbc.AbstractPreparedStatement.prepareFixedStatement(AbstractPreparedStatement.java:1229)
    at org.firebirdsql.jdbc.AbstractPreparedStatement.<init>(AbstractPreparedStatement.java:147)
    at org.firebirdsql.jdbc.FBPreparedStatement.<init>(FBPreparedStatement.java:49)
    at org.firebirdsql.jdbc.FBDatabaseMetaData.getStatement(FBDatabaseMetaData.java:5032)
    at org.firebirdsql.jdbc.FBDatabaseMetaData.doQuery(FBDatabaseMetaData.java:5070)
    at org.firebirdsql.jdbc.FBResultSetMetaData.getExtendedFieldInfo(FBResultSetMetaData.java:514)
    at org.firebirdsql.jdbc.AbstractFieldMetaData.getExtFieldInfo(AbstractFieldMetaData.java:341)
    at org.firebirdsql.jdbc.AbstractFieldMetaData.getPrecisionInternal(AbstractFieldMetaData.java:279)
    at org.firebirdsql.jdbc.FBResultSetMetaData.getPrecision(FBResultSetMetaData.java:289)
    at com.borland.dx.sql.dataset.RuntimeMetaData.a(Unknown Source)
    at com.borland.dx.sql.dataset.JdbcProvider.b(Unknown Source)
    at com.borland.dx.sql.dataset.JdbcProvider.provideData(Unknown Source)
    at com.borland.dx.dataset.StorageDataSet.refresh(Unknown Source)
    at com.borland.dx.sql.dataset.QueryDataSet.refresh(Unknown Source)