If there are composite keys in the database schema, the JBoss Seam Skeleton App [beta] exporter throws an error when parse composite identifier property:

!ENTRY org.hibernate.eclipse 1 10000 2006-06-01 09:17:37.364
!MESSAGE DEBUG Worker-0 org.hibernate.tool.hbm2x.TemplateHelper - putInContext pojo=org.hibernate.tool.hbm2x.pojo.EntityPOJOClass(persistence.data.UserFlow)

!ENTRY org.hibernate.eclipse 1 10000 2006-06-01 09:17:37.377
!MESSAGE DEBUG Worker-0 org.hibernate.tool.hbm2x.TemplateHelper - putInContext clazz=org.hibernate.mapping.RootClass(persistence.data.UserFlow)

!ENTRY org.hibernate.eclipse 4 40000 2006-06-01 09:17:37.381
!MESSAGE ERROR Worker-0 freemarker.runtime -
!STACK 0

Expression field.value.typeName is undefined on line 35, column 6 in seam/find.jsp.ftl.
The problematic instruction:
---------- ==> if-else [on line 35, column 1 in seam/find.jsp.ftl]
----------
Java backtrace for programmers:
---------- freemarker.core.InvalidReferenceException: Expression field.value.typeName is undefined on line 35, column 6 in seam/find.jsp.ftl.
at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124)
at freemarker.core.ComparisonExpression.isTrue(ComparisonExpression.java:121)
at freemarker.core.IfBlock.accept(IfBlock.java:80)
at freemarker.core.Environment.visit(Environment.java:196)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:196)
at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:79)
at freemarker.core.Environment.visit(Environment.java:196)
at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:160)
at freemarker.core.Environment.visit(Environment.java:351)
at freemarker.core.IteratorBlock.accept(IteratorBlock.java:95)
at freemarker.core.Environment.visit(Environment.java:196)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:196)
at freemarker.core.Environment.process(Environment.java:176)
at freemarker.template.Template.process(Template.java:231)
at org.hibernate.tool.hbm2x.TemplateHelper.processTemplate(TemplateHelper.java:243)
at org.hibernate.tool.hbm2x.TemplateProducer.produceToString(TemplateProducer.java:67)
at org.hibernate.tool.hbm2x.TemplateProducer.produce(TemplateProducer.java:28)
at org.hibernate.tool.hbm2x.TemplateProducer.produce(TemplateProducer.java:97)
at org.hibernate.tool.hbm2x.GenericExporter.exportPOJO(GenericExporter.java:112)
at org.hibernate.tool.hbm2x.GenericExporter.exportPersistentClass(GenericExporter.java:101)
at org.hibernate.tool.hbm2x.GenericExporter.exportClasses(GenericExporter.java:84)
at org.hibernate.tool.hbm2x.GenericExporter.doStart(GenericExporter.java:69)
at org.hibernate.tool.hbm2x.AbstractExporter.start(AbstractExporter.java:93)
at org.hibernate.tool.hbm2x.GenericExporter.start(GenericExporter.java:59)
at org.hibernate.tool.hbm2x.seam.SeamExporter.doStart(SeamExporter.java:65)
at org.hibernate.tool.hbm2x.AbstractExporter.start(AbstractExporter.java:93)
at org.hibernate.eclipse.launch.CodeGenerationLaunchDelegate$1.execute(CodeGenerationLaunchDelegate.java:250)
at org.hibernate.console.execution.DefaultExecutionContext.execute(DefaultExecutionContext.java:35)
at org.hibernate.console.ConsoleConfiguration.execute(ConsoleConfiguration.java:68)
at org.hibernate.eclipse.launch.CodeGenerationLaunchDelegate.runExporters(CodeGenerationLaunchDelegate.java:221)
at org.hibernate.eclipse.launch.CodeGenerationLaunchDelegate.launch(CodeGenerationLaunchDelegate.java:108)
at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:590)
at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:515)
at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:733)
at org.eclipse.debug.internal.ui.DebugUIPlugin$6.run(DebugUIPlugin.java:931)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:76)

When you fixed this one you will get the similar error when generates Java sources and hits composite identifier property:

!ENTRY org.hibernate.eclipse 1 10000 2006-06-01 09:10:05.689
!MESSAGE DEBUG Worker-0 org.hibernate.tool.hbm2x.TemplateHelper - putInContext pojo=org.hibernate.tool.hbm2x.pojo.ComponentPOJOClass(persistence.data.FlowActionId)

!ENTRY org.hibernate.eclipse 1 10000 2006-06-01 09:10:05.690
!MESSAGE DEBUG Worker-0 org.hibernate.tool.hbm2x.TemplateHelper - putInContext clazz=org.hibernate.mapping.Component([org.hibernate.mapping.Property(flowCode), org.hibernate.mapping.Property(actionId)])

!ENTRY org.hibernate.eclipse 4 40000 2006-06-01 09:10:05.693
!MESSAGE ERROR Worker-0 freemarker.runtime -
!STACK 0

Expression pojo.identifierProperty is undefined on line 47, column 6 in seam/editorbean.java.ftl.
The problematic instruction:
---------- ==> if pojo.identifierProperty.value.identifierGeneratorStrategy == "assigned" [on line 47, column 1 in seam/editorbean.java.ftl]
----------
Java backtrace for programmers:
---------- freemarker.core.InvalidReferenceException: Expression pojo.identifierProperty is undefined on line 47, column 6 in seam/editorbean.java.ftl.
at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124)
at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:134)
at freemarker.core.Dot._getAsTemplateModel(Dot.java:78)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at freemarker.core.Dot._getAsTemplateModel(Dot.java:74)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at freemarker.core.ComparisonExpression.isTrue(ComparisonExpression.java:111)
at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:77)
at freemarker.core.Environment.visit(Environment.java:196)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:196)
at freemarker.core.Environment.visit(Environment.java:233)
at freemarker.core.BlockAssignment.accept(BlockAssignment.java:83)
at freemarker.core.Environment.visit(Environment.java:196)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:196)
at freemarker.core.Environment.process(Environment.java:176)
at freemarker.template.Template.process(Template.java:231)
at org.hibernate.tool.hbm2x.TemplateHelper.processTemplate(TemplateHelper.java:243)
at org.hibernate.tool.hbm2x.TemplateProducer.produceToString(TemplateProducer.java:67)
at org.hibernate.tool.hbm2x.TemplateProducer.produce(TemplateProducer.java:28)
at org.hibernate.tool.hbm2x.TemplateProducer.produce(TemplateProducer.java:97)
at org.hibernate.tool.hbm2x.GenericExporter.exportPOJO(GenericExporter.java:112)
at org.hibernate.tool.hbm2x.GenericExporter.exportComponent(GenericExporter.java:97)
at org.hibernate.tool.hbm2x.GenericExporter.exportClasses(GenericExporter.java:91)
at org.hibernate.tool.hbm2x.GenericExporter.doStart(GenericExporter.java:69)
at org.hibernate.tool.hbm2x.AbstractExporter.start(AbstractExporter.java:93)
at org.hibernate.tool.hbm2x.GenericExporter.start(GenericExporter.java:59)
at org.hibernate.tool.hbm2x.seam.SeamExporter.doStart(SeamExporter.java:83)
at org.hibernate.tool.hbm2x.AbstractExporter.start(AbstractExporter.java:93)
at org.hibernate.eclipse.launch.CodeGenerationLaunchDelegate$1.execute(CodeGenerationLaunchDelegate.java:250)
at org.hibernate.console.execution.DefaultExecutionContext.execute(DefaultExecutionContext.java:35)
at org.hibernate.console.ConsoleConfiguration.execute(ConsoleConfiguration.java:68)
at org.hibernate.eclipse.launch.CodeGenerationLaunchDelegate.runExporters(CodeGenerationLaunchDelegate.java:221)
at org.hibernate.eclipse.launch.CodeGenerationLaunchDelegate.launch(CodeGenerationLaunchDelegate.java:108)
at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:590)
at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:515)
at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:733)
at org.eclipse.debug.internal.ui.DebugUIPlugin$6.run(DebugUIPlugin.java:931)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:76)