weird maven behaviour

I seem to get a very weird maven behaviour
Basically I sometimes get allmy tests to pass and sometimes
get all mytimes
to fail 

Caused by: java.lang.IllegalArgumentException: No attributes
are implemented
	at
org.apache.xerces.jaxp.DocumentBuilderFactoryImpl.setAttribu
te(DocumentBuilderFactoryImpl.java:98)
	at
org.springframework.orm.jpa.persistenceunit.PersistenceUnitR
eader.validateResource(PersistenceUnitReader.java:172)
	at
org.springframework.orm.jpa.persistenceunit.PersistenceUnitR
eader.readPersistenceUnitInfos(PersistenceUnitReader.java:13
3)
	at
org.springframework.orm.jpa.persistenceunit.DefaultPersisten
ceUnitManager.readPersistenceUnitInfos(DefaultPersistenceUni
tManager.java:278)


>From thelooks of it its using a very old version of the
xerces but when
updating to a newer version of xerces 2.4.0 .. it seems to
work sometimes
looks like its getting different things on different runs in
its calsspath
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