Index: trunk/test/performance/org/openstreetmap/josm/data/osm/KeyValuePerformanceTest.java
===================================================================
--- trunk/test/performance/org/openstreetmap/josm/data/osm/KeyValuePerformanceTest.java	(revision 16822)
+++ trunk/test/performance/org/openstreetmap/josm/data/osm/KeyValuePerformanceTest.java	(revision 16913)
@@ -34,5 +34,5 @@
     private static final int STRING_INTERN_TESTS = 5000000;
     private static final double[] TAG_NODE_RATIOS = new double[] {.05, .3, 3, 20, 200};
-    private ArrayList<String> testStrings = new ArrayList<>();
+    private final ArrayList<String> testStrings = new ArrayList<>();
     private Random random;
 
Index: trunk/test/performance/org/openstreetmap/josm/data/osm/OsmDataGenerator.java
===================================================================
--- trunk/test/performance/org/openstreetmap/josm/data/osm/OsmDataGenerator.java	(revision 16822)
+++ trunk/test/performance/org/openstreetmap/josm/data/osm/OsmDataGenerator.java	(revision 16913)
@@ -80,5 +80,5 @@
      */
     public abstract static class DataGenerator {
-        private String datasetName;
+        private final String datasetName;
         protected final Random random;
         private DataSet ds;
Index: trunk/test/performance/org/openstreetmap/josm/gui/mappaint/mapcss/MapCSSStyleSourceFilterTest.java
===================================================================
--- trunk/test/performance/org/openstreetmap/josm/gui/mappaint/mapcss/MapCSSStyleSourceFilterTest.java	(revision 16822)
+++ trunk/test/performance/org/openstreetmap/josm/gui/mappaint/mapcss/MapCSSStyleSourceFilterTest.java	(revision 16913)
@@ -25,5 +25,5 @@
     private static class CssGenerator {
         StringBuilder sb = new StringBuilder();
-        private KeyValueDataGenerator generator;
+        private final KeyValueDataGenerator generator;
 
         /**
Index: trunk/test/performance/org/openstreetmap/josm/io/OsmReaderPerformanceTest.java
===================================================================
--- trunk/test/performance/org/openstreetmap/josm/io/OsmReaderPerformanceTest.java	(revision 16822)
+++ trunk/test/performance/org/openstreetmap/josm/io/OsmReaderPerformanceTest.java	(revision 16913)
@@ -31,5 +31,5 @@
 public class OsmReaderPerformanceTest {
     private static final int TIMES = 4;
-    private static String DATA_FILE = "nodist/data/neubrandenburg.osm.bz2";
+    private static final String DATA_FILE = "nodist/data/neubrandenburg.osm.bz2";
 
     /**