That's great, thank you for the feedback!
Gianluca Sartori -- https://dueuno.com On Thu, 19 Feb 2026 at 12:52, James Fredley <[email protected]> wrote: > Yes on all apps run in Java 25, the underlying dependencies will hopefully > be ready with updates for Grails 8: > https://github.com/apache/grails-core/issues/15045 > > Related > https://github.com/apache/grails-core/issues/15343 > https://github.com/apache/grails-core/issues/15216 > > James > > On 2026/02/19 11:00:57 Gianluca Sartori wrote: > > Hi folks, > > > > I’ve noticed that when starting my Grails 7 applications with Java 25, my > > console is flooded with warnings like: > > > > WARNING: Use of the three-letter time zone ID "EST" is deprecated and > > it will be removed in a future release > > WARNING: Use of the three-letter time zone ID "PST" is deprecated and > > it will be removed in a future release > > ... > > > > After investigation, I traced the cause using a debugger and stack > traces. > > The root cause is *Apache Commons Lang’s FastDateFormat / > FastDateParser*, > > specifically when used by *Grails’ DateMarshaller for XML*. > > > > Stack trace highlights: > > > > at java.util.TimeZone.getTimeZone(TimeZone.java:549) > > at > org.apache.commons.lang3.time.FastDateParser$TimeZoneStrategy.<init>(FastDateParser.java:531) > > ... > > at > org.grails.web.converters.marshaller.xml.DateMarshaller.<init>(DateMarshaller.java:51) > > > > Explanation > > > > - > > > > FastDateParser internally maps *all three-letter short time zone IDs* > > (like PST, EST, MST) for legacy support. > > - > > > > Modern JVMs (Java 17+) *deprecate these short IDs*, so every mapping > > triggers a warning. > > - > > > > The warnings appear *at startup*, during Grails XML marshaller > > initialization, even if your code does not explicitly use those short > IDs. > > > > This is why a clean Grails 7 application does *not* show the warnings — > the > > marshaller is not invoked until needed. In projects that use > DateMarshaller > > for XML/JSON, the warnings are printed immediately at startup. > > > > *---* > > > > *DISCLAIMER: I'm using AI to recap the issue but I've properly done the > > investigation debugging java.util.TimeZone setting breakpoints at line > 549 > > & 562.---* > > > > It looks like a problem with > > org.grails.web.converters.marshaller.xml.DateMarshaller > > in Java 25,is anyone else experiencing this? > > > > Cheers, > > Gianluca > > > > > > Gianluca Sartori > > -- > > https://dueuno.com > > >
