Fix checkstyle

.github/workflows/main.yaml

@@ -94,7 +94,7 @@ jobs:
       - run: make checks
       - uses: actions/upload-artifact@v3
         with:
-          name: Checkstyle and Spotbugs reports
+          name: Checkstyle and SpotBugs reports
           path: reports
           if-no-files-found: ignore
         if: always()

build.gradle

@@ -42,12 +42,12 @@ configure(subprojects.findAll { ['core', 'examples'].contains(it.name) }) {
         // https://github.com/gradle/gradle/blob/v6.7.1/subprojects/code-quality/src/main/groovy/org/gradle/api/plugins/quality/CheckstylePlugin.java#L37
         configFile = file("$rootProject.rootDir/checkstyle_checks.xml")
         configProperties = ['basedir': project.rootDir.path]
-        reportsDir = file("$project.buildDir/reports/checkstyleReports")
+        reportsDir = file("$project.buildDir/reports/CheckstyleReports")
     }
 
     spotbugs {
         toolVersion = "4.4.2" // com.github.spotbugs:spotbugs-annotations
-        reportsDir = file("$project.buildDir/reports/spotbugsReports")
+        reportsDir = file("$project.buildDir/reports/SpotBugsReports")
         effort = "max"
         reportLevel = "high"
     }

core/src/test/java/org/mapfish/print/servlet/package-info.java

@@ -0,0 +1,2 @@
+/** Test the servlet package. */
+package org.mapfish.print.servlet;