I'm using openfast-1.1.0 to load the FIX/FAST template file published by CME, it seems that "ComposedDecimalParser" is having difficulties parsing a DECIMAL node the with following structure:
<decimal name="NetChgPrevDay" id="451"
presence="optional">
<exponent>
</exponent>
<mantissa>
</mantissa>
</decimal>

Below are the stack dump:
----------------------------------------------------
Exception in thread "main" java.lang.NullPointerException
at org.openfast.template.loader.ComposedDecimalParser.createComposedDecimal(ComposedDecimalParser.java:96)
at org.openfast.template.loader.ComposedDecimalParser.parse(ComposedDecimalParser.java:61)
at org.openfast.template.loader.AbstractFieldParser.parse(AbstractFieldParser.java:51)
at org.openfast.template.loader.GroupParser.parseFields(GroupParser.java:80)
at org.openfast.template.loader.SequenceParser.parse(SequenceParser.java:52)
at org.openfast.template.loader.AbstractFieldParser.parse(AbstractFieldParser.java:51)
at org.openfast.template.loader.GroupParser.parseFields(GroupParser.java:80)
at org.openfast.template.loader.TemplateParser.parse(TemplateParser.java:46)
at org.openfast.template.loader.AbstractFieldParser.parse(AbstractFieldParser.java:51)
at org.openfast.template.loader.XMLMessageTemplateLoader.load(XMLMessageTemplateLoader.java:124)
at org.openfast.examples.consumer.FastMessageConsumer.<init>(FastMessageConsumer.java:36)
at org.openfast.examples.consumer.Main.main(Main.java:69)

However, the ComposedDecimalParser works correctly when the above node is changed to:

<decimal name="NetChgPrevDay" id="451"
presence="optional">
<exponent/>
<mantissa/>
</decimal>