"Use generation in external process" is not workable in case "Schema Documentation (.html)" use for Seam 2.2 Booking example

1) new Project example -> Seam 2.2 Booking example -> http://anonsvn.jboss.org/repos/jbosstools/workspace/snjeza/seam-examples/booking22.zip
2) add hibernate-tools-core.jar into booking22-ejb libs;
3) create Hibernate Code gen configuration with "Schema Documentation (.html)" exporter selected based on "booking22-ejb" Hibernate Console Configuration;
4) in case "Use generation in external process" checked Hibernate Code gen does not work

to find what is an error:
5) export Hibernate Code gen configuration to ant script;
6) run this ant script with -verbose argument - result stacktrace:

>>>
Apache Ant version 1.7.1 compiled on June 27 2008
Buildfile: C:\Users\vitali.ELTEGRA\workspace8\booking22\src\zzz.xml
parsing buildfile C:\Users\vitali.ELTEGRA\workspace8\booking22\src\zzz.xml with URI = file:/C:/Users/vitali.ELTEGRA/workspace8/booking22/src/zzz.xml
Project base dir set to: C:\Users\vitali.ELTEGRA\workspace8\booking22\src
[antlib:org.apache.tools.ant] Could not load definitions from resource org/apache/tools/ant/antlib.xml. It could not be found.
Build sequence for target(s) `hibernateAntCodeGeneration' is [hibernateAntCodeGeneration]
Complete build sequence is [hibernateAntCodeGeneration, ]
hibernateAntCodeGeneration:
[hibernatetool] Executing Hibernate Tool with a JPA Configuration
[hibernatetool] 1. task: hbm2doc (Generates html schema documentation)
[hibernatetool] SLF4J: Class path contains multiple SLF4J bindings.
[hibernatetool] SLF4J: Found binding in [jar:file:/D:/Bin/jbdevstudio_beta1/jboss-eap/jboss-as/client/slf4j-jboss-logging.jar!/org/slf4j/impl/StaticLoggerBinder.class]
[hibernatetool] SLF4J: Found binding in [jar:file:/D:/Bin/jbdevstudio_beta1/jboss-eap/jboss-as/client/slf4j-jboss-logging.jar!/org/slf4j/impl/StaticLoggerBinder.class]
[hibernatetool] SLF4J: Found binding in [jar:file:/D:/Bin/jbdevstudio_beta1/jboss-eap/jboss-as/common/lib/slf4j-jboss-logging.jar!/org/slf4j/impl/StaticLoggerBinder.class]
[hibernatetool] SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
[hibernatetool] An exception occurred while running exporter #2:hbm2doc (Generates html schema documentation)
[hibernatetool] To get the full stack trace run ant with -verbose
[hibernatetool] org.hibernate.HibernateException: Could not instantiate TransactionManagerLookup ''

BUILD FAILED
C:\Users\vitali.ELTEGRA\workspace8\booking22\src\zzz.xml:285: org.hibernate.HibernateException: Could not instantiate TransactionManagerLookup ''
at org.hibernate.tool.ant.HibernateToolTask.reportException(HibernateToolTask.java:226)
at org.hibernate.tool.ant.HibernateToolTask.execute(HibernateToolTask.java:189)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:357)
at org.apache.tools.ant.Target.performTasks(Target.java:385)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.eclipse.ant.internal.launching.remote.EclipseDefaultExecutor.executeTargets(EclipseDefaultExecutor.java:32)
at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
at org.eclipse.ant.internal.launching.remote.InternalAntRunner.run(InternalAntRunner.java:423)
at org.eclipse.ant.internal.launching.remote.InternalAntRunner.main(InternalAntRunner.java:137)
Caused by: org.hibernate.HibernateException: Could not instantiate TransactionManagerLookup ''
at org.hibernate.transaction.TransactionManagerLookupFactory.getTransactionManagerLookup(TransactionManagerLookupFactory.java:93)
at org.hibernate.cfg.SettingsFactory.createTransactionManagerLookup(SettingsFactory.java:439)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:163)
at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2119)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2111)
at org.hibernate.tool.hbm2x.doc.DocHelper.<init>(DocHelper.java:135)
at org.hibernate.tool.hbm2x.DocExporter.setupContext(DocExporter.java:277)
at org.hibernate.tool.hbm2x.AbstractExporter.start(AbstractExporter.java:94)
at org.hibernate.tool.ant.ExporterTask.execute(ExporterTask.java:40)
at org.hibernate.tool.ant.HibernateToolTask.execute(HibernateToolTask.java:186)
... 16 more
— Nested Exception —
org.hibernate.HibernateException: Could not instantiate TransactionManagerLookup ''
at org.hibernate.transaction.TransactionManagerLookupFactory.getTransactionManagerLookup(TransactionManagerLookupFactory.java:93)
at org.hibernate.cfg.SettingsFactory.createTransactionManagerLookup(SettingsFactory.java:439)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:163)
at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2119)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2111)
at org.hibernate.tool.hbm2x.doc.DocHelper.<init>(DocHelper.java:135)
at org.hibernate.tool.hbm2x.DocExporter.setupContext(DocExporter.java:277)
at org.hibernate.tool.hbm2x.AbstractExporter.start(AbstractExporter.java:94)
at org.hibernate.tool.ant.ExporterTask.execute(ExporterTask.java:40)
at org.hibernate.tool.ant.HibernateToolTask.execute(HibernateToolTask.java:186)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:357)
at org.apache.tools.ant.Target.performTasks(Target.java:385)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.eclipse.ant.internal.launching.remote.EclipseDefaultExecutor.executeTargets(EclipseDefaultExecutor.java:32)
at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
at org.eclipse.ant.internal.launching.remote.InternalAntRunner.run(InternalAntRunner.java:423)
at org.eclipse.ant.internal.launching.remote.InternalAntRunner.main(InternalAntRunner.java:137)

Total time: 5 seconds
>>>