Added custom ognl class resolver see #161

src/main/java/org/apache/ibatis/ognl/MyBatisClassResolver.java

@@ -0,0 +1,61 @@
+/*
+ *    Copyright 2009-2012 the original author or authors.
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+package org.apache.ibatis.ognl;
+
+import ognl.ClassResolver;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/*
+ * Custom ognl {@code ClassResolver} which behaves same like ognl's {@code DefaultClassResolver}. But
+ * additionally tries to find the class using the current thread's context-class-loader if not
+ * found via {@code Class.forName}.
+ *
+ * @see https://github.com/mybatis/mybatis-3/issues/161
+ *
+ * @author Daniel Guggi
+ */
+public class MyBatisClassResolver implements ClassResolver {
+
+    private Map<String, Class<?>> classes = new HashMap<String, Class<?>>(101);
+
+    public MyBatisClassResolver() {
+        super();
+    }
+
+    public Class classForName(String className, Map context) throws ClassNotFoundException {
+        Class<?> result = null;
+
+        if ((result = (Class)classes.get(className)) == null) {
+            try {
+                result = Class.forName(className);
+            } catch (ClassNotFoundException e1) {
+                try {
+                    result = Class.forName(className, true, Thread.currentThread().getContextClassLoader());
+                } catch (ClassNotFoundException e2) {
+                    if (className.indexOf('.') == -1) {
+                        result = Class.forName("java.lang." + className);
+                        classes.put("java.lang." + className, result);
+                    }
+                }
+            }
+            classes.put(className, result);
+        }
+        return result;
+    }
+}

src/main/java/org/apache/ibatis/scripting/xmltags/OgnlCache.java

@@ -29,6 +29,7 @@
 import ognl.TokenMgrError;
 
 import org.apache.ibatis.builder.BuilderException;
+import org.apache.ibatis.ognl.MyBatisClassResolver;
 
 /**
  * 
@@ -45,7 +46,8 @@ public class OgnlCache {
 
   public static Object getValue(String expression, Object root) {
     try {
-      return Ognl.getValue(parseExpression(expression), root);
+      Map context = Ognl.createDefaultContext(root, new MyBatisClassResolver());
+      return Ognl.getValue(parseExpression(expression), context, root);
     } catch (OgnlException e) {
       throw new BuilderException("Error evaluating expression '" + expression + "'. Cause: " + e, e);
     }