diff --git a/.github/workflows/test-java.yml b/.github/workflows/test-java.yml
index 332bf1bb..8b305209 100644
--- a/.github/workflows/test-java.yml
+++ b/.github/workflows/test-java.yml
@@ -13,9 +13,9 @@ jobs:
       with:
         distribution: temurin
         java-version: 11
-    - name: Run Gradle Tests
+    - name: Run gradle test
       uses: gradle/gradle-build-action@v2
       with:
         gradle-version: 7.1.1
         build-root-directory: ./clients/java
-        arguments: test
+        arguments: test --info
diff --git a/clients/java/src/test/java/com/phrase/client/api/LocalesApiTest.java b/clients/java/src/test/java/com/phrase/client/api/LocalesApiTest.java
index 6d6a732c..af1f8770 100644
--- a/clients/java/src/test/java/com/phrase/client/api/LocalesApiTest.java
+++ b/clients/java/src/test/java/com/phrase/client/api/LocalesApiTest.java
@@ -137,6 +137,15 @@ public void localeDownloadTest() throws ApiException, IOException, InterruptedEx
 
         mockBackend.enqueue(mockResponse);
 
+        
+        Map<String, String> nestedFormatOptionsMap = new HashMap<>();
+        nestedFormatOptionsMap.put("nested_option", "sub_option");
+        
+        Map<String, Object> formatOptionsMap = new HashMap<>();
+        formatOptionsMap.put("omit_separator_space", "true");
+        formatOptionsMap.put("fallback_language", "en");
+        formatOptionsMap.put("more_options", nestedFormatOptionsMap);
+
         String projectId = "MY_PROJECT_ID";
         String id = "MY_ID";
         String xPhraseAppOTP = null;
@@ -151,7 +160,7 @@ public void localeDownloadTest() throws ApiException, IOException, InterruptedEx
         Boolean includeTranslatedKeys = null;
         Boolean keepNotranslateTags = null;
         Boolean convertEmoji = null;
-        Object formatOptions = null;
+        Object formatOptions = formatOptionsMap;
         String encoding = null;
         Boolean skipUnverifiedTranslations = null;
         Boolean includeUnverifiedTranslations = null;
@@ -164,7 +173,8 @@ public void localeDownloadTest() throws ApiException, IOException, InterruptedEx
         Assert.assertEquals("Correct file contents", fileContents, body);
 
         RecordedRequest recordedRequest = mockBackend.takeRequest();
-        Assert.assertEquals("Request path", "//projects/MY_PROJECT_ID/locales/MY_ID/download", recordedRequest.getPath());
+        // for some reason with deep nested query params, ordering of query params change
+        Assert.assertEquals("Request path", "//projects/MY_PROJECT_ID/locales/MY_ID/download?format_options%5Bomit_separator_space%5D=true&format_options%5Bmore_options%5D%5Bnested_option%5D=sub_option&format_options%5Bfallback_language%5D=en", recordedRequest.getPath());
     }
 
     /**
diff --git a/doc/compiled.json b/doc/compiled.json
index 7464b507..5c62104c 100644
--- a/doc/compiled.json
+++ b/doc/compiled.json
@@ -7450,7 +7450,9 @@
             "schema": {
               "type": "object",
               "properties": {}
-            }
+            },
+            "style": "deepObject",
+            "explode": true
           },
           {
             "description": "Enforces a specific encoding on the file contents. Valid options are \"UTF-8\", \"UTF-16\" and \"ISO-8859-1\".",
diff --git a/openapi-generator/templates/java/build.gradle.mustache b/openapi-generator/templates/java/build.gradle.mustache
index 17eb378a..8b449e45 100644
--- a/openapi-generator/templates/java/build.gradle.mustache
+++ b/openapi-generator/templates/java/build.gradle.mustache
@@ -122,7 +122,7 @@ if(hasProperty('target') && target == 'android') {
        main = System.getProperty('mainClass')
        classpath = sourceSets.main.runtimeClasspath
     }
-    
+
     task sourcesJar(type: Jar, dependsOn: classes) {
         classifier = 'sources'
         from sourceSets.main.allSource
@@ -177,6 +177,12 @@ dependencies {
     testCompile "junit:junit:$junit_version"
 }
 
+test {
+    testLogging {
+        outputs.upToDateWhen {false}
+        showStandardStreams = true
+    }
+}
 
 publishing {
   publications {
diff --git a/openapi-generator/templates/java/libraries/okhttp-gson/ApiClient.mustache b/openapi-generator/templates/java/libraries/okhttp-gson/ApiClient.mustache
index 3969c08d..44f1275d 100644
--- a/openapi-generator/templates/java/libraries/okhttp-gson/ApiClient.mustache
+++ b/openapi-generator/templates/java/libraries/okhttp-gson/ApiClient.mustache
@@ -654,6 +654,27 @@ public class ApiClient {
         }
     }
 
+    public List<Pair> mappedParameterToPairs(String name, Object parameter){
+        List<Pair> params = new ArrayList<Pair>();
+
+        if(parameter instanceof Map){
+            Map<String, Object> mappedParameter = (Map<String, Object>) parameter;
+
+            for(Map.Entry<String, Object> entry : mappedParameter.entrySet()){
+                String key = name + "[" + entry.getKey() + "]";
+                Object value = entry.getValue();
+
+                {{! TODO check why nested params ordering is different }}
+                params.addAll(parsedMappedParams(key, value, new ArrayList<Pair>()));
+            }
+
+        }
+        
+
+        return params;
+    }
+
+
     /**
      * Formats the specified query parameter to a list containing a single {@code Pair} object.
      *
@@ -1445,4 +1466,21 @@ public class ApiClient {
             throw new AssertionError(e);
         }
     }
+
+    private List<Pair> parsedMappedParams(String key, Object value, List<Pair> params){
+        if(value instanceof Map){
+            Map<String, Object> mappedValue = (Map<String, Object>) value;
+
+            for(Map.Entry<String, Object> entry : mappedValue.entrySet()){
+                String nestedKey = key + "[" + entry.getKey() + "]";
+                parsedMappedParams(nestedKey, entry.getValue(), params); 
+            }
+        }
+        else{
+            params.add(new Pair(key, parameterToString(value)));    
+        }
+
+        return params;
+    }
+
 }
diff --git a/openapi-generator/templates/java/libraries/okhttp-gson/api.mustache b/openapi-generator/templates/java/libraries/okhttp-gson/api.mustache
index bbbca63b..6481de25 100644
--- a/openapi-generator/templates/java/libraries/okhttp-gson/api.mustache
+++ b/openapi-generator/templates/java/libraries/okhttp-gson/api.mustache
@@ -100,7 +100,12 @@ public class {{classname}} {
         {{javaUtilPrefix}}List<Pair> localVarCollectionQueryParams = new {{javaUtilPrefix}}ArrayList<Pair>();
         {{#queryParams}}
         if ({{paramName}} != null) {
+            {{#isDeepObject}}
+            localVarQueryParams.addAll(localVarApiClient.mappedParameterToPairs("{{baseName}}", {{paramName}}));
+            {{/isDeepObject}}
+            {{^isDeepObject}}
             {{#collectionFormat}}localVarCollectionQueryParams.addAll(localVarApiClient.parameterToPairs("{{{collectionFormat}}}", {{/collectionFormat}}{{^collectionFormat}}localVarQueryParams.addAll(localVarApiClient.parameterToPair({{/collectionFormat}}"{{baseName}}", {{paramName}}));
+            {{/isDeepObject}}
         }
 
         {{/queryParams}}
diff --git a/paths/locales/download.yaml b/paths/locales/download.yaml
index 456daabb..97b052a0 100644
--- a/paths/locales/download.yaml
+++ b/paths/locales/download.yaml
@@ -73,6 +73,8 @@ parameters:
     schema:
       type: object
       properties: {}
+    style: deepObject
+    explode: true
   - description: Enforces a specific encoding on the file contents. Valid options are "UTF-8", "UTF-16" and "ISO-8859-1".
     example:
     name: encoding