[SCB-2577] enable checkstyle UpperEll (#3090)
diff --git a/ci/checkstyle/checkstyle.xml b/ci/checkstyle/checkstyle.xml
index 3bd7a11..311f255 100644
--- a/ci/checkstyle/checkstyle.xml
+++ b/ci/checkstyle/checkstyle.xml
@@ -90,6 +90,10 @@
<module name="UnusedImports">
<property name="processJavadoc" value="true"/>
</module>
+ <module name="UpperEll">
+ <!-- Checks that long constants are defined with an upper ell.-->
+ <property name="severity" value="error"/>
+ </module>
<module name="WhitespaceAfter">
<!-- Checks that commas, semicolons and typecasts are followed by
whitespace.