potential NPEs

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@793516 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/optional/junit/BriefJUnitResultFormatter.java

@@ -253,7 +253,7 @@ public class BriefJUnitResultFormatter implements JUnitResultFormatter {
         try {
             resultWriter.write(formatTest(test) + type);
             resultWriter.newLine();
-            resultWriter.write(error.getMessage());
+            resultWriter.write(String.valueOf(error.getMessage()));
             resultWriter.newLine();
             String strace = JUnitTestRunner.getFilteredTrace(error);
             resultWriter.write(strace);

src/main/org/apache/tools/ant/taskdefs/optional/junit/JUnitTask.java

@@ -1969,13 +1969,13 @@ public class JUnitTask extends Task {
 
     private static void printDual(BufferedWriter w, PrintStream s, String text)
         throws IOException {
-        w.write(text);
+        w.write(String.valueOf(text));
         s.print(text);
     }
 
     private static void printlnDual(BufferedWriter w, PrintStream s, String text)
         throws IOException {
-        w.write(text);
+        w.write(String.valueOf(text));
         w.newLine();
         s.println(text);
     }

src/main/org/apache/tools/ant/taskdefs/optional/junit/PlainJUnitResultFormatter.java

@@ -247,7 +247,7 @@ public class PlainJUnitResultFormatter implements JUnitResultFormatter {
             try {
                 wri.write(type);
                 wri.newLine();
-                wri.write(t.getMessage());
+                wri.write(String.valueOf(t.getMessage()));
                 wri.newLine();
                 String strace = JUnitTestRunner.getFilteredTrace(t);
                 wri.write(strace);