diff --git a/livy/src/main/java/org/apache/zeppelin/livy/BaseLivyInterprereter.java b/livy/src/main/java/org/apache/zeppelin/livy/BaseLivyInterpreter.java
similarity index 98%
rename from livy/src/main/java/org/apache/zeppelin/livy/BaseLivyInterprereter.java
rename to livy/src/main/java/org/apache/zeppelin/livy/BaseLivyInterpreter.java
index 77c98d9aeb9..b52ba16e57b 100644
--- a/livy/src/main/java/org/apache/zeppelin/livy/BaseLivyInterprereter.java
+++ b/livy/src/main/java/org/apache/zeppelin/livy/BaseLivyInterpreter.java
@@ -49,7 +49,6 @@
 import java.util.Map;
 import java.util.Properties;
 import java.util.Set;
-import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.ConcurrentHashMap;
 
 
@@ -57,9 +56,9 @@
 /**
  * Base class for livy interpreters.
  */
-public abstract class BaseLivyInterprereter extends Interpreter {
+public abstract class BaseLivyInterpreter extends Interpreter {
 
-  protected static final Logger LOGGER = LoggerFactory.getLogger(BaseLivyInterprereter.class);
+  protected static final Logger LOGGER = LoggerFactory.getLogger(BaseLivyInterpreter.class);
   private static Gson gson = new GsonBuilder().setPrettyPrinting().disableHtmlEscaping().create();
   private static String SESSION_NOT_FOUND_PATTERN = "\"Session '\\d+' not found.\"";
 
@@ -68,7 +67,6 @@ public abstract class BaseLivyInterprereter extends Interpreter {
   private int sessionCreationTimeout;
   private int pullStatusInterval;
   protected boolean displayAppInfo;
-  private AtomicBoolean sessionExpired = new AtomicBoolean(false);
   protected LivyVersion livyVersion;
   private RestTemplate restTemplate;
 
@@ -77,7 +75,7 @@ public abstract class BaseLivyInterprereter extends Interpreter {
   private ConcurrentHashMap<String, Integer> paragraphId2StmtProgressMap =
       new ConcurrentHashMap<>();
 
-  public BaseLivyInterprereter(Properties property) {
+  public BaseLivyInterpreter(Properties property) {
     super(property);
     this.livyURL = property.getProperty("zeppelin.livy.url");
     this.displayAppInfo = Boolean.parseBoolean(
diff --git a/livy/src/main/java/org/apache/zeppelin/livy/LivyPySpark3Interpreter.java b/livy/src/main/java/org/apache/zeppelin/livy/LivyPySpark3Interpreter.java
index f1f35384c86..174c2c0a483 100644
--- a/livy/src/main/java/org/apache/zeppelin/livy/LivyPySpark3Interpreter.java
+++ b/livy/src/main/java/org/apache/zeppelin/livy/LivyPySpark3Interpreter.java
@@ -17,16 +17,6 @@
 
 package org.apache.zeppelin.livy;
 
-import org.apache.zeppelin.interpreter.*;
-import org.apache.zeppelin.interpreter.thrift.InterpreterCompletion;
-import org.apache.zeppelin.scheduler.Scheduler;
-import org.apache.zeppelin.scheduler.SchedulerFactory;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
 import java.util.Properties;
 
 
diff --git a/livy/src/main/java/org/apache/zeppelin/livy/LivyPySparkBaseInterpreter.java b/livy/src/main/java/org/apache/zeppelin/livy/LivyPySparkBaseInterpreter.java
index c0de234ed57..17b20e3634f 100644
--- a/livy/src/main/java/org/apache/zeppelin/livy/LivyPySparkBaseInterpreter.java
+++ b/livy/src/main/java/org/apache/zeppelin/livy/LivyPySparkBaseInterpreter.java
@@ -23,7 +23,7 @@
 /**
  * Base class for PySpark Interpreter
  */
-public abstract class LivyPySparkBaseInterpreter extends BaseLivyInterprereter {
+public abstract class LivyPySparkBaseInterpreter extends BaseLivyInterpreter {
 
   public LivyPySparkBaseInterpreter(Properties property) {
     super(property);
diff --git a/livy/src/main/java/org/apache/zeppelin/livy/LivyPySparkInterpreter.java b/livy/src/main/java/org/apache/zeppelin/livy/LivyPySparkInterpreter.java
index b5bf10628b4..d664bbe762f 100644
--- a/livy/src/main/java/org/apache/zeppelin/livy/LivyPySparkInterpreter.java
+++ b/livy/src/main/java/org/apache/zeppelin/livy/LivyPySparkInterpreter.java
@@ -17,16 +17,6 @@
 
 package org.apache.zeppelin.livy;
 
-import org.apache.zeppelin.interpreter.*;
-import org.apache.zeppelin.interpreter.thrift.InterpreterCompletion;
-import org.apache.zeppelin.scheduler.Scheduler;
-import org.apache.zeppelin.scheduler.SchedulerFactory;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
 import java.util.Properties;
 
 
diff --git a/livy/src/main/java/org/apache/zeppelin/livy/LivySparkInterpreter.java b/livy/src/main/java/org/apache/zeppelin/livy/LivySparkInterpreter.java
index f3a5eab4390..606ef64a8a4 100644
--- a/livy/src/main/java/org/apache/zeppelin/livy/LivySparkInterpreter.java
+++ b/livy/src/main/java/org/apache/zeppelin/livy/LivySparkInterpreter.java
@@ -17,23 +17,12 @@
 
 package org.apache.zeppelin.livy;
 
-import org.apache.zeppelin.interpreter.*;
-import org.apache.zeppelin.interpreter.thrift.InterpreterCompletion;
-import org.apache.zeppelin.scheduler.Scheduler;
-import org.apache.zeppelin.scheduler.SchedulerFactory;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
 import java.util.Properties;
-import java.util.concurrent.ConcurrentHashMap;
 
 /**
  * Livy Spark interpreter for Zeppelin.
  */
-public class LivySparkInterpreter extends BaseLivyInterprereter {
+public class LivySparkInterpreter extends BaseLivyInterpreter {
 
   public LivySparkInterpreter(Properties property) {
     super(property);
diff --git a/livy/src/main/java/org/apache/zeppelin/livy/LivySparkRInterpreter.java b/livy/src/main/java/org/apache/zeppelin/livy/LivySparkRInterpreter.java
index 9bd24b707e1..c2704371c64 100644
--- a/livy/src/main/java/org/apache/zeppelin/livy/LivySparkRInterpreter.java
+++ b/livy/src/main/java/org/apache/zeppelin/livy/LivySparkRInterpreter.java
@@ -17,23 +17,13 @@
 
 package org.apache.zeppelin.livy;
 
-import org.apache.zeppelin.interpreter.*;
-import org.apache.zeppelin.interpreter.thrift.InterpreterCompletion;
-import org.apache.zeppelin.scheduler.Scheduler;
-import org.apache.zeppelin.scheduler.SchedulerFactory;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
 import java.util.Properties;
 
 
 /**
  * Livy PySpark interpreter for Zeppelin.
  */
-public class LivySparkRInterpreter extends BaseLivyInterprereter {
+public class LivySparkRInterpreter extends BaseLivyInterpreter {
 
   public LivySparkRInterpreter(Properties property) {
     super(property);
diff --git a/livy/src/main/java/org/apache/zeppelin/livy/LivySparkSQLInterpreter.java b/livy/src/main/java/org/apache/zeppelin/livy/LivySparkSQLInterpreter.java
index 9c0d35918a7..d132b5b41db 100644
--- a/livy/src/main/java/org/apache/zeppelin/livy/LivySparkSQLInterpreter.java
+++ b/livy/src/main/java/org/apache/zeppelin/livy/LivySparkSQLInterpreter.java
@@ -30,7 +30,7 @@
 /**
  * Livy SparkSQL Interpreter for Zeppelin.
  */
-public class LivySparkSQLInterpreter extends BaseLivyInterprereter {
+public class LivySparkSQLInterpreter extends BaseLivyInterpreter {
 
   public static final String ZEPPELIN_LIVY_SPARK_SQL_FIELD_TRUNCATE =
       "zeppelin.livy.spark.sql.field.truncate";
diff --git a/livy/src/test/java/org/apache/zeppelin/livy/LivyInterpreterIT.java b/livy/src/test/java/org/apache/zeppelin/livy/LivyInterpreterIT.java
index 007c0edda3f..6db75e9dd72 100644
--- a/livy/src/test/java/org/apache/zeppelin/livy/LivyInterpreterIT.java
+++ b/livy/src/test/java/org/apache/zeppelin/livy/LivyInterpreterIT.java
@@ -761,7 +761,7 @@ public void testLivyTutorialNote() throws IOException {
     }
   }
 
-  private boolean isSpark2(BaseLivyInterprereter interpreter, InterpreterContext context) {
+  private boolean isSpark2(BaseLivyInterpreter interpreter, InterpreterContext context) {
     InterpreterResult result = null;
     if (interpreter instanceof LivySparkRInterpreter) {
       result = interpreter.interpret("sparkR.session()", context);