diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/ApiClient.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/ApiClient.mustache
index f6f9c774762e..c998ecde8926 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/ApiClient.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/ApiClient.mustache
@@ -671,6 +671,40 @@ public class ApiClient {
         return params;
     }
 
+    /**
+     * Formats the specified collection path parameter to a string value.
+     *
+     * @param collectionFormat The collection format of the parameter.
+     * @param value The value of the parameter.
+     * @return String representation of the parameter
+     */
+    public String collectionPathParameterToString(String collectionFormat, Collection value) {
+        // create the value based on the collection format
+        if ("multi".equals(collectionFormat)) {
+            // not valid for path params
+            return parameterToString(value);
+        }
+
+        // collectionFormat is assumed to be "csv" by default
+        String delimiter = ",";
+
+        if ("ssv".equals(collectionFormat)) {
+            delimiter = " ";
+        } else if ("tsv".equals(collectionFormat)) {
+            delimiter = "\t";
+        } else if ("pipes".equals(collectionFormat)) {
+            delimiter = "|";
+        }
+
+        StringBuilder sb = new StringBuilder() ;
+        for (Object item : value) {
+            sb.append(delimiter);
+            sb.append(parameterToString(item));
+        }
+
+        return sb.substring(delimiter.length());
+    }
+
     /**
      * Sanitize filename by removing path.
      * e.g. ../../sun.gif becomes sun.gif
diff --git a/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/api.mustache b/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/api.mustache
index 6e2c3714c0ec..a06c2e35d596 100644
--- a/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/api.mustache
+++ b/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/api.mustache
@@ -86,7 +86,7 @@ public class {{classname}} {
 
         // create path and map variables
         String localVarPath = "{{{path}}}"{{#pathParams}}
-            .replaceAll("\\{" + "{{baseName}}" + "\\}", localVarApiClient.escapeString({{{paramName}}}.toString())){{/pathParams}};
+            .replaceAll("\\{" + "{{baseName}}" + "\\}", localVarApiClient.escapeString({{#collectionFormat}}localVarApiClient.collectionPathParameterToString("{{{collectionFormat}}}", {{{paramName}}}){{/collectionFormat}}{{^collectionFormat}}{{{paramName}}}.toString(){{/collectionFormat}})){{/pathParams}};
 
         {{javaUtilPrefix}}List<Pair> localVarQueryParams = new {{javaUtilPrefix}}ArrayList<Pair>();
         {{javaUtilPrefix}}List<Pair> localVarCollectionQueryParams = new {{javaUtilPrefix}}ArrayList<Pair>();
diff --git a/samples/client/petstore/java/okhttp-gson-parcelableModel/src/main/java/org/openapitools/client/ApiClient.java b/samples/client/petstore/java/okhttp-gson-parcelableModel/src/main/java/org/openapitools/client/ApiClient.java
index 970b2a690c70..a9fe469fe71c 100644
--- a/samples/client/petstore/java/okhttp-gson-parcelableModel/src/main/java/org/openapitools/client/ApiClient.java
+++ b/samples/client/petstore/java/okhttp-gson-parcelableModel/src/main/java/org/openapitools/client/ApiClient.java
@@ -637,6 +637,40 @@ public List<Pair> parameterToPairs(String collectionFormat, String name, Collect
         return params;
     }
 
+    /**
+     * Formats the specified collection path parameter to a string value.
+     *
+     * @param collectionFormat The collection format of the parameter.
+     * @param value The value of the parameter.
+     * @return String representation of the parameter
+     */
+    public String collectionPathParameterToString(String collectionFormat, Collection value) {
+        // create the value based on the collection format
+        if ("multi".equals(collectionFormat)) {
+            // not valid for path params
+            return parameterToString(value);
+        }
+
+        // collectionFormat is assumed to be "csv" by default
+        String delimiter = ",";
+
+        if ("ssv".equals(collectionFormat)) {
+            delimiter = " ";
+        } else if ("tsv".equals(collectionFormat)) {
+            delimiter = "\t";
+        } else if ("pipes".equals(collectionFormat)) {
+            delimiter = "|";
+        }
+
+        StringBuilder sb = new StringBuilder() ;
+        for (Object item : value) {
+            sb.append(delimiter);
+            sb.append(parameterToString(item));
+        }
+
+        return sb.substring(delimiter.length());
+    }
+
     /**
      * Sanitize filename by removing path.
      * e.g. ../../sun.gif becomes sun.gif
diff --git a/samples/client/petstore/java/okhttp-gson/src/main/java/org/openapitools/client/ApiClient.java b/samples/client/petstore/java/okhttp-gson/src/main/java/org/openapitools/client/ApiClient.java
index 970b2a690c70..a9fe469fe71c 100644
--- a/samples/client/petstore/java/okhttp-gson/src/main/java/org/openapitools/client/ApiClient.java
+++ b/samples/client/petstore/java/okhttp-gson/src/main/java/org/openapitools/client/ApiClient.java
@@ -637,6 +637,40 @@ public List<Pair> parameterToPairs(String collectionFormat, String name, Collect
         return params;
     }
 
+    /**
+     * Formats the specified collection path parameter to a string value.
+     *
+     * @param collectionFormat The collection format of the parameter.
+     * @param value The value of the parameter.
+     * @return String representation of the parameter
+     */
+    public String collectionPathParameterToString(String collectionFormat, Collection value) {
+        // create the value based on the collection format
+        if ("multi".equals(collectionFormat)) {
+            // not valid for path params
+            return parameterToString(value);
+        }
+
+        // collectionFormat is assumed to be "csv" by default
+        String delimiter = ",";
+
+        if ("ssv".equals(collectionFormat)) {
+            delimiter = " ";
+        } else if ("tsv".equals(collectionFormat)) {
+            delimiter = "\t";
+        } else if ("pipes".equals(collectionFormat)) {
+            delimiter = "|";
+        }
+
+        StringBuilder sb = new StringBuilder() ;
+        for (Object item : value) {
+            sb.append(delimiter);
+            sb.append(parameterToString(item));
+        }
+
+        return sb.substring(delimiter.length());
+    }
+
     /**
      * Sanitize filename by removing path.
      * e.g. ../../sun.gif becomes sun.gif