diff --git a/src/scala/microsoft-spark-2-3/pom.xml b/src/scala/microsoft-spark-2-3/pom.xml
index 8cde04b6e..4df5b0c22 100644
--- a/src/scala/microsoft-spark-2-3/pom.xml
+++ b/src/scala/microsoft-spark-2-3/pom.xml
@@ -45,6 +45,12 @@
       <version>1.2.5</version>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>com.microsoft.scala</groupId>
+      <artifactId>microsoft-spark-common</artifactId>
+      <version>${microsoft-spark.version}</version>
+      <scope>compile</scope>
+    </dependency>
   </dependencies>
 
   <build>
@@ -72,6 +78,24 @@
           </args>
         </configuration>
       </plugin>
+      <plugin>
+        <artifactId>maven-assembly-plugin</artifactId>
+        <version>3.1.1</version>
+        <configuration>
+          <appendAssemblyId>false</appendAssemblyId>
+          <descriptorRefs>
+            <descriptorRef>jar-with-dependencies</descriptorRef>
+          </descriptorRefs>
+        </configuration>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <goals>
+              <goal>single</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
     </plugins>
   </build>
 </project>
diff --git a/src/scala/microsoft-spark-2-4/pom.xml b/src/scala/microsoft-spark-2-4/pom.xml
index 1c959bb05..efb82a6c1 100644
--- a/src/scala/microsoft-spark-2-4/pom.xml
+++ b/src/scala/microsoft-spark-2-4/pom.xml
@@ -45,6 +45,12 @@
       <version>1.2.5</version>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>com.microsoft.scala</groupId>
+      <artifactId>microsoft-spark-common</artifactId>
+      <version>${microsoft-spark.version}</version>
+      <scope>compile</scope>
+    </dependency>
   </dependencies>
 
   <build>
@@ -72,6 +78,24 @@
           </args>
         </configuration>
       </plugin>
+      <plugin>
+        <artifactId>maven-assembly-plugin</artifactId>
+        <version>3.1.1</version>
+        <configuration>
+          <appendAssemblyId>false</appendAssemblyId>
+          <descriptorRefs>
+            <descriptorRef>jar-with-dependencies</descriptorRef>
+          </descriptorRefs>
+        </configuration>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <goals>
+              <goal>single</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
     </plugins>
   </build>
 </project>
diff --git a/src/scala/microsoft-spark-2-4/src/main/scala/org/apache/spark/api/dotnet/JVMObjectTracker.scala b/src/scala/microsoft-spark-2-4/src/main/scala/org/apache/spark/api/dotnet/JVMObjectTracker.scala
deleted file mode 100644
index aceb58c01..000000000
--- a/src/scala/microsoft-spark-2-4/src/main/scala/org/apache/spark/api/dotnet/JVMObjectTracker.scala
+++ /dev/null
@@ -1,54 +0,0 @@
-/*
- * Licensed to the .NET Foundation under one or more agreements.
- * The .NET Foundation licenses this file to you under the MIT license.
- * See the LICENSE file in the project root for more information.
- */
-
-package org.apache.spark.api.dotnet
-
-import scala.collection.mutable.HashMap
-
-/**
- * Tracks JVM objects returned to .NET which is useful for invoking calls from .NET on JVM objects.
- */
-private[dotnet] class JVMObjectTracker {
-
-  // Multiple threads may access objMap and increase objCounter. Because get method return Option,
-  // it is convenient to use a Scala map instead of java.util.concurrent.ConcurrentHashMap.
-  private[this] val objMap = new HashMap[String, Object]
-  private[this] var objCounter: Int = 1
-
-  def getObject(id: String): Object = {
-    synchronized {
-      objMap(id)
-    }
-  }
-
-  def get(id: String): Option[Object] = {
-    synchronized {
-      objMap.get(id)
-    }
-  }
-
-  def put(obj: Object): String = {
-    synchronized {
-      val objId = objCounter.toString
-      objCounter = objCounter + 1
-      objMap.put(objId, obj)
-      objId
-    }
-  }
-
-  def remove(id: String): Option[Object] = {
-    synchronized {
-      objMap.remove(id)
-    }
-  }
-
-  def clear(): Unit = {
-    synchronized {
-      objMap.clear()
-      objCounter = 1
-    }
-  }
-}
diff --git a/src/scala/microsoft-spark-3-0/pom.xml b/src/scala/microsoft-spark-3-0/pom.xml
index 9ece1794f..c52d2c6b7 100644
--- a/src/scala/microsoft-spark-3-0/pom.xml
+++ b/src/scala/microsoft-spark-3-0/pom.xml
@@ -45,6 +45,12 @@
       <version>1.2.5</version>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>com.microsoft.scala</groupId>
+      <artifactId>microsoft-spark-common</artifactId>
+      <version>${microsoft-spark.version}</version>
+      <scope>compile</scope>
+    </dependency>
   </dependencies>
 
   <build>
@@ -72,6 +78,24 @@
           </args>
         </configuration>
       </plugin>
+      <plugin>
+        <artifactId>maven-assembly-plugin</artifactId>
+        <version>3.1.1</version>
+        <configuration>
+          <appendAssemblyId>false</appendAssemblyId>
+          <descriptorRefs>
+            <descriptorRef>jar-with-dependencies</descriptorRef>
+          </descriptorRefs>
+        </configuration>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <goals>
+              <goal>single</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
     </plugins>
   </build>
 </project>
diff --git a/src/scala/microsoft-spark-3-0/src/main/scala/org/apache/spark/api/dotnet/JVMObjectTracker.scala b/src/scala/microsoft-spark-3-0/src/main/scala/org/apache/spark/api/dotnet/JVMObjectTracker.scala
deleted file mode 100644
index 81cfaf88b..000000000
--- a/src/scala/microsoft-spark-3-0/src/main/scala/org/apache/spark/api/dotnet/JVMObjectTracker.scala
+++ /dev/null
@@ -1,55 +0,0 @@
-/*
- * Licensed to the .NET Foundation under one or more agreements.
- * The .NET Foundation licenses this file to you under the MIT license.
- * See the LICENSE file in the project root for more information.
- */
-
-
-package org.apache.spark.api.dotnet
-
-import scala.collection.mutable.HashMap
-
-/**
- * Tracks JVM objects returned to .NET which is useful for invoking calls from .NET on JVM objects.
- */
-private[dotnet] class JVMObjectTracker {
-
-  // Multiple threads may access objMap and increase objCounter. Because get method return Option,
-  // it is convenient to use a Scala map instead of java.util.concurrent.ConcurrentHashMap.
-  private[this] val objMap = new HashMap[String, Object]
-  private[this] var objCounter: Int = 1
-
-  def getObject(id: String): Object = {
-    synchronized {
-      objMap(id)
-    }
-  }
-
-  def get(id: String): Option[Object] = {
-    synchronized {
-      objMap.get(id)
-    }
-  }
-
-  def put(obj: Object): String = {
-    synchronized {
-      val objId = objCounter.toString
-      objCounter = objCounter + 1
-      objMap.put(objId, obj)
-      objId
-    }
-  }
-
-  def remove(id: String): Option[Object] = {
-    synchronized {
-      objMap.remove(id)
-    }
-  }
-
-  def clear(): Unit = {
-    synchronized {
-      objMap.clear()
-      objCounter = 1
-    }
-  }
-}
diff --git a/src/scala/microsoft-spark-common/pom.xml b/src/scala/microsoft-spark-common/pom.xml
new file mode 100644
index 000000000..1f256f157
--- /dev/null
+++ b/src/scala/microsoft-spark-common/pom.xml
@@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>com.microsoft.scala</groupId>
+    <artifactId>microsoft-spark</artifactId>
+    <version>${microsoft-spark.version}</version>
+  </parent>
+  <artifactId>microsoft-spark-common</artifactId>
+  <inceptionYear>2019</inceptionYear>
+  <properties>
+    <encoding>UTF-8</encoding>
+    <scala.version>2.12.8</scala.version>
+    <scala.binary.version>2.12</scala.binary.version>
+  </properties>
+
+
+  <dependencies>
+    <dependency>
+      <groupId>org.scala-lang</groupId>
+      <artifactId>scala-library</artifactId>
+      <version>${scala.version}</version>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <sourceDirectory>src/main/scala</sourceDirectory>
+    <testSourceDirectory>src/test/scala</testSourceDirectory>
+    <plugins>
+      <plugin>
+        <groupId>org.scala-tools</groupId>
+        <artifactId>maven-scala-plugin</artifactId>
+        <version>2.15.2</version>
+        <executions>
+          <execution>
+            <goals>
+              <goal>compile</goal>
+              <goal>testCompile</goal>
+            </goals>
+          </execution>
+        </executions>
+        <configuration>
+          <scalaVersion>${scala.version}</scalaVersion>
+          <args>
+            <arg>-target:jvm-1.8</arg>
+            <arg>-deprecation</arg>
+            <arg>-feature</arg>
+          </args>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+
+</project>
diff --git a/src/scala/microsoft-spark-2-3/src/main/scala/org/apache/spark/api/dotnet/JVMObjectTracker.scala b/src/scala/microsoft-spark-common/src/main/scala/org/apache/spark/api/dotnet/JVMObjectTracker.scala
similarity index 96%
rename from src/scala/microsoft-spark-2-3/src/main/scala/org/apache/spark/api/dotnet/JVMObjectTracker.scala
rename to src/scala/microsoft-spark-common/src/main/scala/org/apache/spark/api/dotnet/JVMObjectTracker.scala
index aceb58c01..b5290cb49 100644
--- a/src/scala/microsoft-spark-2-3/src/main/scala/org/apache/spark/api/dotnet/JVMObjectTracker.scala
+++ b/src/scala/microsoft-spark-common/src/main/scala/org/apache/spark/api/dotnet/JVMObjectTracker.scala
@@ -11,7 +11,7 @@ import scala.collection.mutable.HashMap
 /**
  * Tracks JVM objects returned to .NET which is useful for invoking calls from .NET on JVM objects.
  */
-private[dotnet] class JVMObjectTracker {
+class JVMObjectTracker {
 
   // Multiple threads may access objMap and increase objCounter. Because get method return Option,
   // it is convenient to use a Scala map instead of java.util.concurrent.ConcurrentHashMap.
diff --git a/src/scala/pom.xml b/src/scala/pom.xml
index bb0b408ae..56c661af6 100644
--- a/src/scala/pom.xml
+++ b/src/scala/pom.xml
@@ -14,6 +14,7 @@
     <module>microsoft-spark-2-3</module>
     <module>microsoft-spark-2-4</module>
     <module>microsoft-spark-3-0</module>
+    <module>microsoft-spark-common</module>
   </modules>
 
   <pluginRepositories>