Alessandro,

you might have noticed some gt-render failures in 
GeoTools-Master-OpenJDK8 (and the downstream failures of 
GeoServer-Master-OpenJDK8 that might be caused by this).
http://build.geo-solutions.it/jenkins/view/GeoTools/job/GeoTools-Master-OpenJDK8/

junit.framework.AssertionFailedError: More labels in image2 than image1
        at junit.framework.Assert.fail(Assert.java:57)
        at junit.framework.Assert.assertTrue(Assert.java:22)
        at junit.framework.TestCase.assertTrue(TestCase.java:192)
        at 
org.geotools.renderer.lite.LetterConflictTest.testLetterConflictEnabledCurvedLine(LetterConflictTest.java:196)

The build passes for me with Maven 3.3.9 and openjdk-8-jdk 8u91-b14-2 
amd64 on debian/sid:

$ mvn -version
Apache Maven 3.3.9 (bb52d8502b132ec0a5a3f4c09453c07478323dc5; 
2015-11-11T05:41:47+13:00)
Maven home: /home/ben/java/maven
Java version: 1.8.0_91, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-8-openjdk-amd64/jre
Default locale: en_GB, platform encoding: UTF-8
OS name: "linux", version: "4.6.0-1-amd64", arch: "amd64", family: "unix"

One of the differences between Oracle JDK and OpenJDK is that OpenJDK 
ships with no fonts and makes use of system fonts. This has in the past 
broken some gt-render unit tests on systems with unusual font 
configuration. Have you tried running LetterConflictTest in interactive 
mode on build.geo-solutions.it?

Kind regards,

-- 
Ben Caradoc-Davies <b...@transient.nz>
Director
Transient Software Limited <http://transient.nz/>
New Zealand

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