diff --git a/AutoRest/Generators/Java/Java.Tests/src/main/java/fixtures/bodyinteger/IntOperations.java b/AutoRest/Generators/Java/Java.Tests/src/main/java/fixtures/bodyinteger/IntOperations.java
index 06d2cb2eb7..9710c80eab 100644
--- a/AutoRest/Generators/Java/Java.Tests/src/main/java/fixtures/bodyinteger/IntOperations.java
+++ b/AutoRest/Generators/Java/Java.Tests/src/main/java/fixtures/bodyinteger/IntOperations.java
@@ -233,10 +233,9 @@ public interface IntOperations {
      * @param intBody the long value
      * @throws ErrorException exception thrown from REST call
      * @throws IOException exception thrown from serialization/deserialization
-     * @throws IllegalArgumentException exception thrown from invalid parameters
      * @return the {@link ServiceResponse} object if successful.
      */
-    ServiceResponse<Void> putUnixTimeDate(long intBody) throws ErrorException, IOException, IllegalArgumentException;
+    ServiceResponse<Void> putUnixTimeDate(long intBody) throws ErrorException, IOException;
 
     /**
      * Put datetime encoded as Unix time.
diff --git a/AutoRest/Generators/Java/Java.Tests/src/main/java/fixtures/bodyinteger/IntOperationsImpl.java b/AutoRest/Generators/Java/Java.Tests/src/main/java/fixtures/bodyinteger/IntOperationsImpl.java
index 58cd455e4d..134ce02e57 100644
--- a/AutoRest/Generators/Java/Java.Tests/src/main/java/fixtures/bodyinteger/IntOperationsImpl.java
+++ b/AutoRest/Generators/Java/Java.Tests/src/main/java/fixtures/bodyinteger/IntOperationsImpl.java
@@ -620,13 +620,9 @@ private ServiceResponse<Long> getUnixTimeDelegate(Response<ResponseBody> respons
      * @param intBody the long value
      * @throws ErrorException exception thrown from REST call
      * @throws IOException exception thrown from serialization/deserialization
-     * @throws IllegalArgumentException exception thrown from invalid parameters
      * @return the {@link ServiceResponse} object if successful.
      */
-    public ServiceResponse<Void> putUnixTimeDate(long intBody) throws ErrorException, IOException, IllegalArgumentException {
-        if (intBody == null) {
-            throw new IllegalArgumentException("Parameter intBody is required and cannot be null.");
-        }
+    public ServiceResponse<Void> putUnixTimeDate(long intBody) throws ErrorException, IOException {
         Call<ResponseBody> call = service.putUnixTimeDate(intBody);
         return putUnixTimeDateDelegate(call.execute());
     }
@@ -643,10 +639,6 @@ public ServiceCall putUnixTimeDateAsync(long intBody, final ServiceCallback<Void
         if (serviceCallback == null) {
             throw new IllegalArgumentException("ServiceCallback is required for async calls.");
         }
-        if (intBody == null) {
-            serviceCallback.failure(new IllegalArgumentException("Parameter intBody is required and cannot be null."));
-            return null;
-        }
         Call<ResponseBody> call = service.putUnixTimeDate(intBody);
         final ServiceCall serviceCall = new ServiceCall(call);
         call.enqueue(new ServiceResponseCallback<Void>(serviceCallback) {
@@ -662,7 +654,7 @@ public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response)
         return serviceCall;
     }
 
-    private ServiceResponse<Void> putUnixTimeDateDelegate(Response<ResponseBody> response) throws ErrorException, IOException, IllegalArgumentException {
+    private ServiceResponse<Void> putUnixTimeDateDelegate(Response<ResponseBody> response) throws ErrorException, IOException {
         return new ServiceResponseBuilder<Void, ErrorException>(this.client.getMapperAdapter())
                 .register(200, new TypeToken<Void>() { }.getType())
                 .registerError(ErrorException.class)
diff --git a/AutoRest/Generators/Java/Java.Tests/src/main/java/fixtures/url/PathsOperations.java b/AutoRest/Generators/Java/Java.Tests/src/main/java/fixtures/url/PathsOperations.java
index 6f82029407..1ccd08f952 100644
--- a/AutoRest/Generators/Java/Java.Tests/src/main/java/fixtures/url/PathsOperations.java
+++ b/AutoRest/Generators/Java/Java.Tests/src/main/java/fixtures/url/PathsOperations.java
@@ -508,10 +508,9 @@ public interface PathsOperations {
      * @param unixTimeUrlPath Unix time encoded value
      * @throws ErrorException exception thrown from REST call
      * @throws IOException exception thrown from serialization/deserialization
-     * @throws IllegalArgumentException exception thrown from invalid parameters
      * @return the {@link ServiceResponse} object if successful.
      */
-    ServiceResponse<Void> unixTimeUrl(long unixTimeUrlPath) throws ErrorException, IOException, IllegalArgumentException;
+    ServiceResponse<Void> unixTimeUrl(long unixTimeUrlPath) throws ErrorException, IOException;
 
     /**
      * Get the date 2016-04-13 encoded value as '1460505600' (Unix time).
diff --git a/AutoRest/Generators/Java/Java.Tests/src/main/java/fixtures/url/PathsOperationsImpl.java b/AutoRest/Generators/Java/Java.Tests/src/main/java/fixtures/url/PathsOperationsImpl.java
index 60f4ea1452..31942e3ce2 100644
--- a/AutoRest/Generators/Java/Java.Tests/src/main/java/fixtures/url/PathsOperationsImpl.java
+++ b/AutoRest/Generators/Java/Java.Tests/src/main/java/fixtures/url/PathsOperationsImpl.java
@@ -1428,13 +1428,9 @@ private ServiceResponse<Void> arrayCsvInPathDelegate(Response<ResponseBody> resp
      * @param unixTimeUrlPath Unix time encoded value
      * @throws ErrorException exception thrown from REST call
      * @throws IOException exception thrown from serialization/deserialization
-     * @throws IllegalArgumentException exception thrown from invalid parameters
      * @return the {@link ServiceResponse} object if successful.
      */
-    public ServiceResponse<Void> unixTimeUrl(long unixTimeUrlPath) throws ErrorException, IOException, IllegalArgumentException {
-        if (unixTimeUrlPath == null) {
-            throw new IllegalArgumentException("Parameter unixTimeUrlPath is required and cannot be null.");
-        }
+    public ServiceResponse<Void> unixTimeUrl(long unixTimeUrlPath) throws ErrorException, IOException {
         Call<ResponseBody> call = service.unixTimeUrl(unixTimeUrlPath);
         return unixTimeUrlDelegate(call.execute());
     }
@@ -1451,10 +1447,6 @@ public ServiceCall unixTimeUrlAsync(long unixTimeUrlPath, final ServiceCallback<
         if (serviceCallback == null) {
             throw new IllegalArgumentException("ServiceCallback is required for async calls.");
         }
-        if (unixTimeUrlPath == null) {
-            serviceCallback.failure(new IllegalArgumentException("Parameter unixTimeUrlPath is required and cannot be null."));
-            return null;
-        }
         Call<ResponseBody> call = service.unixTimeUrl(unixTimeUrlPath);
         final ServiceCall serviceCall = new ServiceCall(call);
         call.enqueue(new ServiceResponseCallback<Void>(serviceCallback) {
@@ -1470,7 +1462,7 @@ public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response)
         return serviceCall;
     }
 
-    private ServiceResponse<Void> unixTimeUrlDelegate(Response<ResponseBody> response) throws ErrorException, IOException, IllegalArgumentException {
+    private ServiceResponse<Void> unixTimeUrlDelegate(Response<ResponseBody> response) throws ErrorException, IOException {
         return new ServiceResponseBuilder<Void, ErrorException>(this.client.getMapperAdapter())
                 .register(200, new TypeToken<Void>() { }.getType())
                 .registerError(ErrorException.class)
diff --git a/AutoRest/Generators/Java/Java/TemplateModels/MethodTemplateModel.cs b/AutoRest/Generators/Java/Java/TemplateModels/MethodTemplateModel.cs
index c9f8bc6faf..7b9afbb821 100644
--- a/AutoRest/Generators/Java/Java/TemplateModels/MethodTemplateModel.cs
+++ b/AutoRest/Generators/Java/Java/TemplateModels/MethodTemplateModel.cs
@@ -363,6 +363,7 @@ public IEnumerable<ParameterModel> RequiredNullableParameters
                         !param.Type.IsPrimaryType(KnownPrimaryType.Double) &&
                         !param.Type.IsPrimaryType(KnownPrimaryType.Boolean) &&
                         !param.Type.IsPrimaryType(KnownPrimaryType.Long) &&
+                        !param.Type.IsPrimaryType(KnownPrimaryType.UnixTime) &&
                         !param.IsConstant && param.IsRequired)
                     {
                         yield return param;