diff --git a/core/amber/src/main/scala/edu/uci/ics/amber/engine/architecture/deploysemantics/PhysicalOp.scala b/core/amber/src/main/scala/edu/uci/ics/amber/engine/architecture/deploysemantics/PhysicalOp.scala
index 67000e14fdd..581e9ebcd4d 100644
--- a/core/amber/src/main/scala/edu/uci/ics/amber/engine/architecture/deploysemantics/PhysicalOp.scala
+++ b/core/amber/src/main/scala/edu/uci/ics/amber/engine/architecture/deploysemantics/PhysicalOp.scala
@@ -2,12 +2,7 @@ package edu.uci.ics.amber.engine.architecture.deploysemantics
 
 import akka.actor.Deploy
 import akka.remote.RemoteScope
-import com.fasterxml.jackson.annotation.{
-  JsonAutoDetect,
-  JsonIgnore,
-  JsonIgnoreProperties,
-  JsonProperty
-}
+import com.fasterxml.jackson.annotation.{JsonIgnore, JsonIgnoreProperties}
 import com.typesafe.scalalogging.LazyLogging
 import edu.uci.ics.amber.engine.architecture.common.AkkaActorService
 import edu.uci.ics.amber.engine.architecture.controller.execution.OperatorExecution
diff --git a/core/amber/src/main/scala/edu/uci/ics/texera/web/model/websocket/request/WorkflowExecuteRequest.scala b/core/amber/src/main/scala/edu/uci/ics/texera/web/model/websocket/request/WorkflowExecuteRequest.scala
index 818e5e2fb0d..04e94187628 100644
--- a/core/amber/src/main/scala/edu/uci/ics/texera/web/model/websocket/request/WorkflowExecuteRequest.scala
+++ b/core/amber/src/main/scala/edu/uci/ics/texera/web/model/websocket/request/WorkflowExecuteRequest.scala
@@ -1,8 +1,6 @@
 package edu.uci.ics.texera.web.model.websocket.request
 
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize
-import edu.uci.ics.amber.engine.architecture.deploysemantics.PhysicalOp
-import edu.uci.ics.amber.engine.common.workflow.PhysicalLink
 import edu.uci.ics.texera.workflow.common.operators.LogicalOp
 import edu.uci.ics.texera.workflow.common.workflow.{LogicalLink, WorkflowSettings}
 
diff --git a/core/amber/src/main/scala/edu/uci/ics/texera/workflow/common/workflow/WorkflowCompiler.scala b/core/amber/src/main/scala/edu/uci/ics/texera/workflow/common/workflow/WorkflowCompiler.scala
index 8935e7958a9..341bfc25f52 100644
--- a/core/amber/src/main/scala/edu/uci/ics/texera/workflow/common/workflow/WorkflowCompiler.scala
+++ b/core/amber/src/main/scala/edu/uci/ics/texera/workflow/common/workflow/WorkflowCompiler.scala
@@ -15,7 +15,7 @@ import edu.uci.ics.texera.web.workflowruntimestate.WorkflowAggregatedState.FAILE
 import edu.uci.ics.texera.web.workflowruntimestate.WorkflowFatalError
 import edu.uci.ics.texera.workflow.common.WorkflowContext
 import edu.uci.ics.texera.workflow.common.storage.OpResultStorage
-import edu.uci.ics.texera.workflow.common.tuple.schema.{Attribute, Schema}
+import edu.uci.ics.texera.workflow.common.tuple.schema.Schema
 import edu.uci.ics.texera.workflow.operators.sink.managed.ProgressiveSinkOpDesc
 import edu.uci.ics.texera.workflow.operators.visualization.VisualizationConstants