[OLINGO-768] Exception Implementation

Signed-off-by: Chandan V A <chandan.v.a@sap.com>
diff --git a/ext/odata-jpa/odata-jpa-core/src/main/java/org/apache/olingo/jpa/core/exception/ODataJPAModelException.java b/ext/odata-jpa/odata-jpa-core/src/main/java/org/apache/olingo/jpa/core/exception/ODataJPAModelException.java
new file mode 100644
index 0000000..fa50a36
--- /dev/null
+++ b/ext/odata-jpa/odata-jpa-core/src/main/java/org/apache/olingo/jpa/core/exception/ODataJPAModelException.java
@@ -0,0 +1,49 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.olingo.jpa.core.exception;
+
+import org.apache.olingo.jpa.api.exception.ODataJPAException;
+
+public class ODataJPAModelException extends ODataJPAException {
+  /**
+   * 
+   */
+  private static final long serialVersionUID = 1L;
+  private static final String DEFAULT_BUNDLE_NAME = "odata-jpa-model-exception-i18n";
+
+  public static enum MessageKeys implements MessageKey {
+    INVALID_PERSISTENCE_UNIT;
+    
+    @Override
+    public String getKey() {
+      return name();
+    }
+  }
+
+  public ODataJPAModelException(String developmentMessage, Throwable cause, MessageKey messageKey,
+      String[] parameters) {
+    super(developmentMessage, cause, messageKey, parameters);
+  }
+
+  @Override
+  protected String getBundleName() {
+    return DEFAULT_BUNDLE_NAME ;
+  }
+
+}
diff --git a/ext/odata-jpa/odata-jpa-core/src/main/java/org/apache/olingo/jpa/core/exception/ODataJPARuntimeException.java b/ext/odata-jpa/odata-jpa-core/src/main/java/org/apache/olingo/jpa/core/exception/ODataJPARuntimeException.java
index 0731d2b..9886fc0 100644
--- a/ext/odata-jpa/odata-jpa-core/src/main/java/org/apache/olingo/jpa/core/exception/ODataJPARuntimeException.java
+++ b/ext/odata-jpa/odata-jpa-core/src/main/java/org/apache/olingo/jpa/core/exception/ODataJPARuntimeException.java
@@ -26,7 +26,7 @@
    * 
    */
   private static final long serialVersionUID = 1L;
-  private static final String DEFAULT_BUNDLE_NAME = "odata-jpa-core-exception-i18n";
+  private static final String DEFAULT_BUNDLE_NAME = "odata-jpa-rt-exception-i18n";
 
   public static enum MessageKeys implements MessageKey {
     NULL_PUNIT;
diff --git a/ext/odata-jpa/odata-jpa-core/src/main/resources/odata-jpa-model-exception-i18n.properties b/ext/odata-jpa/odata-jpa-core/src/main/resources/odata-jpa-model-exception-i18n.properties
new file mode 100644
index 0000000..366086b
--- /dev/null
+++ b/ext/odata-jpa/odata-jpa-core/src/main/resources/odata-jpa-model-exception-i18n.properties
@@ -0,0 +1,20 @@
+#-------------------------------------------------------------------------------
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+#-------------------------------------------------------------------------------
+# Basic Apache Olingo exception messages
+#
diff --git a/ext/odata-jpa/odata-jpa-core/src/main/resources/odata-jpa-core-exception-i18n.properties b/ext/odata-jpa/odata-jpa-core/src/main/resources/odata-jpa-rt-exception-i18n.properties
similarity index 100%
rename from ext/odata-jpa/odata-jpa-core/src/main/resources/odata-jpa-core-exception-i18n.properties
rename to ext/odata-jpa/odata-jpa-core/src/main/resources/odata-jpa-rt-exception-i18n.properties