diff --git a/hive/src/main/java/io/confluent/connect/storage/errors/HiveMetaStoreException.java b/hive/src/main/java/io/confluent/connect/storage/errors/HiveMetaStoreException.java
index 5fffa0fd1..fad09ed7d 100644
--- a/hive/src/main/java/io/confluent/connect/storage/errors/HiveMetaStoreException.java
+++ b/hive/src/main/java/io/confluent/connect/storage/errors/HiveMetaStoreException.java
@@ -19,6 +19,8 @@
 
 public class HiveMetaStoreException extends ConnectException {
 
+  private static final long serialVersionUID = 1L;
+
   public HiveMetaStoreException(String s) {
     super(s);
   }
diff --git a/partitioner/src/main/java/io/confluent/connect/storage/errors/PartitionException.java b/partitioner/src/main/java/io/confluent/connect/storage/errors/PartitionException.java
index 9cd55d486..8c4ff4f2c 100644
--- a/partitioner/src/main/java/io/confluent/connect/storage/errors/PartitionException.java
+++ b/partitioner/src/main/java/io/confluent/connect/storage/errors/PartitionException.java
@@ -18,7 +18,9 @@
 import org.apache.kafka.connect.errors.ConnectException;
 
 public class PartitionException extends ConnectException {
-  
+
+  private static final long serialVersionUID = 1L;
+
   public PartitionException(String s) {
     super(s);
   }
diff --git a/pom.xml b/pom.xml
index e62d6ed95..ff7c0294c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -172,6 +172,7 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <inherited>true</inherited>
                 <configuration>
+                    <showWarnings>true</showWarnings>
                     <compilerArgs>
                         <arg>-Xlint:all</arg>
                         <arg>-Werror</arg>