Performance issue: 8 String concatenation in log.trace() on inject()

Typical logging issue, String concatenation in JndiPropertyInjector in EJB.

Snippet from
http://anonsvn.jboss.org/repos/jbossas/projects/ejb3/tags/jboss-ejb3-core-1.3.4/src/main/java/org/jboss/injection/JndiPropertyInjector.java

...
58861 wolfc public void inject(Object instance)
58861 wolfc {
58861 wolfc Object value = lookup(jndiName);
64345 wolfc log.trace("injecting " + value + " from " + jndiName + " into " + property + " of " + instance);
73107 wolfc try
73107 wolfc

{ 73107 wolfc property.set(instance, value); 73107 wolfc }

73107 wolfc catch(IllegalArgumentException e)
73107 wolfc {
...

We should rather be using isTraceEnabled before doing such expensive (and often "useless" operation.