Change the failed message to something (hopefully) a bit more clear.

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git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@271902 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/Javac.java

@@ -111,7 +111,7 @@ import java.util.Vector;
 public class Javac extends MatchingTask {
 
     private final static String FAIL_MSG
-        = "Compile failed, messages should have been provided.";
+        = "Compile failed; see the compiler error output for details.";
 
     private Path src;
     private File destDir;

src/main/org/apache/tools/ant/taskdefs/Rmic.java

@@ -105,7 +105,7 @@ import java.util.Vector;
 public class Rmic extends MatchingTask {
 
     private final static String FAIL_MSG 
-        = "Rmic failed, messages should have been provided.";
+        = "Rmic failed; see the compiler error output for details.";
 
     private File baseDir;
     private String classname;