Deal with lazy class verification.

PR: 15377
Submitted by:	David Konecny <david.konecny at volny.cz>


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@273760 13f79535-47bb-0310-9956-ffa450edef68

docs/manual/install.html

@@ -288,7 +288,7 @@ Installing Ant / Optional Tasks</a> section above.</p>
     <td><a href="http://jakarta.apache.org/regexp/" target="_top">jakarta.apache.org/regexp/</a></td>
   </tr>
   <tr>
-    <td>jakarta-oro-2.0.4.jar</td>
+    <td>jakarta-oro-2.0.6.jar</td>
     <td>regexp type with mappers and the perforce tasks</td>
     <td><a href="http://jakarta.apache.org/oro/" target="_top">jakarta.apache.org/oro/</a></td>
   </tr>
@@ -408,7 +408,7 @@ Installing Ant / Optional Tasks</a> section above.</p>
 </table>
 <br>
 <hr>
-<p align="center">Copyright &copy; 2000-2002 Apache Software Foundation. All rights
+<p align="center">Copyright &copy; 2000-2003 Apache Software Foundation. All rights
 Reserved.</p>
 
 </body>

src/main/org/apache/tools/ant/util/regexp/RegexpFactory.java

@@ -1,7 +1,7 @@
 /*
  * The Apache Software License, Version 1.1
  *
- * Copyright (c) 2001-2002 The Apache Software Foundation.  All rights 
+ * Copyright (c) 2001-2003 The Apache Software Foundation.  All rights 
  * reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -95,14 +95,17 @@ public class RegexpFactory extends RegexpMatcherFactory {
         }
 
         try {
+            testAvailability("java.util.regex.Matcher");
             return createRegexpInstance("org.apache.tools.ant.util.regexp.Jdk14RegexpRegexp");
         } catch (BuildException be) {}
         
         try {
+            testAvailability("org.apache.oro.text.regex.Pattern");
             return createRegexpInstance("org.apache.tools.ant.util.regexp.JakartaOroRegexp");
         } catch (BuildException be) {}
         
         try {
+            testAvailability("org.apache.regexp.RE");
             return createRegexpInstance("org.apache.tools.ant.util.regexp.JakartaRegexpRegexp");
         } catch (BuildException be) {}
 

src/main/org/apache/tools/ant/util/regexp/RegexpMatcherFactory.java

@@ -1,7 +1,7 @@
 /*
  * The Apache Software License, Version 1.1
  *
- * Copyright (c) 2000-2002 The Apache Software Foundation.  All rights 
+ * Copyright (c) 2000-2003 The Apache Software Foundation.  All rights 
  * reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -100,14 +100,17 @@ public class RegexpMatcherFactory {
         }
 
         try {
+            testAvailability("java.util.regex.Matcher");
             return createInstance("org.apache.tools.ant.util.regexp.Jdk14RegexpMatcher");
         } catch (BuildException be) {}
         
         try {
+            testAvailability("org.apache.oro.text.regex.Pattern");
             return createInstance("org.apache.tools.ant.util.regexp.JakartaOroMatcher");
         } catch (BuildException be) {}
         
         try {
+            testAvailability("org.apache.regexp.RE");
             return createInstance("org.apache.tools.ant.util.regexp.JakartaRegexpMatcher");
         } catch (BuildException be) {}
 
@@ -123,4 +126,12 @@ public class RegexpMatcherFactory {
             throw new BuildException(t);
         }
     }
+    
+    protected void testAvailability(String className) throws BuildException {
+        try {
+            Class implClass = Class.forName(className);
+        } catch (Throwable t) {
+            throw new BuildException(t);
+        }
+    }
 }