return null if no template could be found

scm-webapp/src/main/java/sonia/scm/template/MustacheTemplateEngine.java

@@ -37,6 +37,7 @@ package sonia.scm.template;
 
 import com.github.mustachejava.Mustache;
 
+import com.google.common.util.concurrent.UncheckedExecutionException;
 import com.google.inject.Inject;
 
 import org.slf4j.Logger;
@@ -104,20 +105,47 @@ public class MustacheTemplateEngine implements TemplateEngine
     }
 
     Template template = null;
-    Mustache mustache = factory.compile(templatePath);
 
-    if (mustache != null)
+    try
     {
-      if (logger.isTraceEnabled())
+
+      Mustache mustache = factory.compile(templatePath);
+
+      if (mustache != null)
       {
-        logger.trace("return mustache template for {}", templatePath);
+        if (logger.isTraceEnabled())
+        {
+          logger.trace("return mustache template for {}", templatePath);
+        }
+
+        template = new MustacheTemplate(templatePath, mustache);
+      }
+      else if (logger.isWarnEnabled())
+      {
+        logger.warn("could not find mustache template at {}", templatePath);
       }
 
-      template = new MustacheTemplate(templatePath, mustache);
     }
-    else if (logger.isWarnEnabled())
+    catch (MustacheTemplateNotFoundException ex)
     {
-      logger.warn("could not find mustache template at {}", templatePath);
+      if (logger.isWarnEnabled())
+      {
+        logger.warn("could not find mustache template at {}", templatePath);
+      }
+    }
+    catch (UncheckedExecutionException ex)
+    {
+      if (ex.getCause() instanceof MustacheTemplateNotFoundException)
+      {
+        if (logger.isWarnEnabled())
+        {
+          logger.warn("could not find mustache template at {}", templatePath);
+        }
+        else
+        {
+          throw ex;
+        }
+      }
     }
 
     return template;

scm-webapp/src/main/java/sonia/scm/template/MustacheTemplateNotFoundException.java

@@ -0,0 +1,85 @@
+/**
+ * Copyright (c) 2010, Sebastian Sdorra All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer. 2. Redistributions in
+ * binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or other
+ * materials provided with the distribution. 3. Neither the name of SCM-Manager;
+ * nor the names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://bitbucket.org/sdorra/scm-manager
+ *
+ */
+
+
+
+package sonia.scm.template;
+
+/**
+ *
+ * @author Sebastian Sdorra
+ */
+public final class MustacheTemplateNotFoundException extends RuntimeException
+{
+
+  /** Field description */
+  private static final long serialVersionUID = -1998700779900576217L;
+
+  //~--- constructors ---------------------------------------------------------
+
+  /**
+   * Constructs ...
+   *
+   */
+  public MustacheTemplateNotFoundException() {}
+
+  /**
+   * Constructs ...
+   *
+   *
+   * @param message
+   */
+  public MustacheTemplateNotFoundException(String message)
+  {
+    super(message);
+  }
+
+  /**
+   * Constructs ...
+   *
+   *
+   * @param cause
+   */
+  public MustacheTemplateNotFoundException(Throwable cause)
+  {
+    super(cause);
+  }
+
+  /**
+   * Constructs ...
+   *
+   *
+   * @param message
+   * @param cause
+   */
+  public MustacheTemplateNotFoundException(String message, Throwable cause)
+  {
+    super(message, cause);
+  }
+}

scm-webapp/src/main/java/sonia/scm/template/ServletMustacheFactory.java

@@ -30,6 +30,7 @@
  */
 
 
+
 package sonia.scm.template;
 
 //~--- non-JDK imports --------------------------------------------------------
@@ -129,6 +130,12 @@ public class ServletMustacheFactory extends DefaultMustacheFactory
       logger.warn("could not find resource {}", resourceName);
     }
 
+    if (reader == null)
+    {
+      throw new MustacheTemplateNotFoundException(
+        "could not find template for resource ".concat(resourceName));
+    }
+
     return reader;
   }