From 5715c7e29252ed230389cfce9c1a0376fec82813 Mon Sep 17 00:00:00 2001
From: Kai Moritz <kai@juplo.de>
Date: Sat, 31 Aug 2013 09:01:43 +0200
Subject: [PATCH] Fixed failure when target/classes does not exist when runnin
 mvn test phase

Thanks to Stephen Johnson <stejohns@redhat.com>

Details from the original email:
---------
The following patch stops builds failing when target/classes (or no main java exists), and target/test-classes and src/tests exist.

So for example calling

mvn test -> invokes compiler:compile and if you have export bound to process-classes phase in executions it will fail.  Maybe better to give info and carry on.  Say for example they want to leave the executions in place that deal with process-classes and also process-test-classes but they do not want it to fail if there is no java to annotate in src/classes.  The other way would be to comment out the executions bound to process-classes.  What about export being bound to process-class by default?  Could this also cause issues?

In either case I think the plugin code did checks for src/classes directory existing, in which case even call "mvn test" would fail as src/classes would not exist as no java existed in src/main only in src/test.  Have a look through the patch and see if its of any use.
---
 pom.xml                                       |  4 +++
 .../juplo/plugins/hibernate4/Hbm2DdlMojo.java | 25 ++++++++++---------
 2 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/pom.xml b/pom.xml
index 80516763..3868597a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -57,6 +57,10 @@
       <name>Eduard Szente</name>
       <email>eduard.szente@gmail.com</email>
     </contributor>
+    <contributor>
+      <name>Stephen Johnson</name>
+      <email>stejohns@redhat.com</email>
+    </contributor>
   </contributors>
 
   <distributionManagement>
diff --git a/src/main/java/de/juplo/plugins/hibernate4/Hbm2DdlMojo.java b/src/main/java/de/juplo/plugins/hibernate4/Hbm2DdlMojo.java
index 7077c9f4..24178c19 100644
--- a/src/main/java/de/juplo/plugins/hibernate4/Hbm2DdlMojo.java
+++ b/src/main/java/de/juplo/plugins/hibernate4/Hbm2DdlMojo.java
@@ -289,10 +289,6 @@ public class Hbm2DdlMojo extends AbstractMojo
       return;
     }
 
-    File dir = new File(outputDirectory);
-    if (!dir.exists())
-      throw new MojoExecutionException("Cannot scan for annotated classes in " + outputDirectory + ": directory does not exist!");
-
     Map<String,String> md5s;
     boolean modified = false;
     File saved = new File(buildDirectory + File.separator + MD5S);
@@ -360,17 +356,22 @@ public class Hbm2DdlMojo extends AbstractMojo
     try
     {
       AnnotationDB db = new AnnotationDB();
-      getLog().info("Scanning directory " + outputDirectory + " for annotated classes...");
-      URL dirUrl = dir.toURI().toURL();
-      db.scanArchives(dirUrl);
+      File dir = new File(outputDirectory);
+      if (dir.exists())
+      {
+        getLog().info("Scanning directory " + outputDirectory + " for annotated classes...");
+        URL dirUrl = dir.toURI().toURL();
+        db.scanArchives(dirUrl);
+      }
       if (scanTestClasses)
       {
         dir = new File(testOutputDirectory);
-        if (!dir.exists())
-          throw new MojoExecutionException("Cannot scan for annotated test-classes in " + testOutputDirectory + ": directory does not exist!");
-        getLog().info("Scanning directory " + testOutputDirectory + " for annotated classes...");
-        dirUrl = dir.toURI().toURL();
-        db.scanArchives(dirUrl);
+        if (dir.exists())
+        {
+          getLog().info("Scanning directory " + testOutputDirectory + " for annotated classes...");
+          URL dirUrl = dir.toURI().toURL();
+          db.scanArchives(dirUrl);
+        }
       }
 
       Set<String> classNames = new HashSet<String>();
-- 
2.20.1