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I have been searching for quite some time to read an "official statement" on this matter, but found none. Therefore, could anyone please indicate a reference or point to some news on this? What version of JasperReports has support for Java 8, or at least is there partial support available? (or is it "trial and error"?)
Some posts on the Jasper community forum seem to indicate that iReport and JasperReports Server does not provide Java 8 support yet. On the other hand, I see some indications that it does, at least in part (http://community.jaspersoft.com/jasperreports-server/issues/3498). It is a bit confusing.
UPDATE Please see Teodor Danciu's answer below for the current status.
As far as i know, JasperReport does not support Java 8 yet, just like you said. In this post a member of JasperSoft staff clearly states that they will introduce it on later versions of their library, so i would trust him: JasperReport - Java 8 compatibility.
We are not aware of any issue with running JasperReports Library on Java 8.
At some point we needed to upgrade the JDT compiler to support Java 8, but after doing so, there were no other issues we know about.