diff --git a/src/main/org/apache/tools/ant/taskdefs/compilers/DefaultCompilerAdapter.java b/src/main/org/apache/tools/ant/taskdefs/compilers/DefaultCompilerAdapter.java
index 2aa3dd43b..9b231d38b 100644
--- a/src/main/org/apache/tools/ant/taskdefs/compilers/DefaultCompilerAdapter.java
+++ b/src/main/org/apache/tools/ant/taskdefs/compilers/DefaultCompilerAdapter.java
@@ -108,7 +108,7 @@ public abstract class DefaultCompilerAdapter implements CompilerAdapter {
     protected String memoryMaximumSize;
 
     protected File[] compileList;
-    protected static String lSep = System.getProperty("line.separator");
+    protected static final String lSep = System.getProperty("line.separator");
     protected Javac attributes;
 
     private FileUtils fileUtils = FileUtils.newFileUtils();
diff --git a/src/main/org/apache/tools/ant/taskdefs/optional/jsp/JspNameMangler.java b/src/main/org/apache/tools/ant/taskdefs/optional/jsp/JspNameMangler.java
index cd83753a5..f3539ea38 100644
--- a/src/main/org/apache/tools/ant/taskdefs/optional/jsp/JspNameMangler.java
+++ b/src/main/org/apache/tools/ant/taskdefs/optional/jsp/JspNameMangler.java
@@ -67,7 +67,7 @@ public class JspNameMangler implements JspMangler {
     /**
      * this is the list of keywords which can not be used as classnames
      */
-    public static String[] keywords = {
+    public static final String[] keywords = {
             "assert",
             "abstract", "boolean", "break", "byte",
             "case", "catch", "char", "class",
diff --git a/src/main/org/apache/tools/ant/types/Path.java b/src/main/org/apache/tools/ant/types/Path.java
index 6f5657022..22e485431 100644
--- a/src/main/org/apache/tools/ant/types/Path.java
+++ b/src/main/org/apache/tools/ant/types/Path.java
@@ -100,7 +100,7 @@ public class Path extends DataType implements Cloneable {
     private Vector elements;
 
     /** The system classspath as a Path object */
-    public static Path systemClasspath =
+    public static final Path systemClasspath =
         new Path(null, System.getProperty("java.class.path"));