[Java][okhttp-gson] fix failure to deserialize floats (#3846)

* fixed bug where nullApi.java would be generated.  Instead, generated DefaultApi.java to match the default path /{pathParam}

* fix to bug #3157

* update samples

samples/client/petstore/java/google-api-client/docs/TypeHolderExample.md

@@ -8,6 +8,7 @@ Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **stringItem** | **String** |  | 
 **numberItem** | [**BigDecimal**](BigDecimal.md) |  | 
+**floatItem** | **Float** |  | 
 **integerItem** | **Integer** |  | 
 **boolItem** | **Boolean** |  | 
 **arrayItem** | **List<Integer>** |  | 

samples/client/petstore/java/google-api-client/src/main/java/org/openapitools/client/model/TypeHolderExample.java

@@ -32,6 +32,7 @@ import com.fasterxml.jackson.annotation.JsonPropertyOrder;
 @JsonPropertyOrder({
   TypeHolderExample.JSON_PROPERTY_STRING_ITEM,
   TypeHolderExample.JSON_PROPERTY_NUMBER_ITEM,
+  TypeHolderExample.JSON_PROPERTY_FLOAT_ITEM,
   TypeHolderExample.JSON_PROPERTY_INTEGER_ITEM,
   TypeHolderExample.JSON_PROPERTY_BOOL_ITEM,
   TypeHolderExample.JSON_PROPERTY_ARRAY_ITEM
@@ -44,6 +45,9 @@ public class TypeHolderExample {
   public static final String JSON_PROPERTY_NUMBER_ITEM = "number_item";
   private BigDecimal numberItem;
 
+  public static final String JSON_PROPERTY_FLOAT_ITEM = "float_item";
+  private Float floatItem;
+
   public static final String JSON_PROPERTY_INTEGER_ITEM = "integer_item";
   private Integer integerItem;
 
@@ -104,6 +108,31 @@ public class TypeHolderExample {
   }
 
 
+  public TypeHolderExample floatItem(Float floatItem) {
+    
+    this.floatItem = floatItem;
+    return this;
+  }
+
+   /**
+   * Get floatItem
+   * @return floatItem
+  **/
+  @ApiModelProperty(example = "1.234", required = true, value = "")
+  @JsonProperty(JSON_PROPERTY_FLOAT_ITEM)
+  @JsonInclude(value = JsonInclude.Include.ALWAYS)
+
+  public Float getFloatItem() {
+    return floatItem;
+  }
+
+
+
+  public void setFloatItem(Float floatItem) {
+    this.floatItem = floatItem;
+  }
+
+
   public TypeHolderExample integerItem(Integer integerItem) {
     
     this.integerItem = integerItem;
@@ -195,6 +224,7 @@ public class TypeHolderExample {
     TypeHolderExample typeHolderExample = (TypeHolderExample) o;
     return Objects.equals(this.stringItem, typeHolderExample.stringItem) &&
         Objects.equals(this.numberItem, typeHolderExample.numberItem) &&
+        Objects.equals(this.floatItem, typeHolderExample.floatItem) &&
         Objects.equals(this.integerItem, typeHolderExample.integerItem) &&
         Objects.equals(this.boolItem, typeHolderExample.boolItem) &&
         Objects.equals(this.arrayItem, typeHolderExample.arrayItem);
@@ -202,7 +232,7 @@ public class TypeHolderExample {
 
   @Override
   public int hashCode() {
-    return Objects.hash(stringItem, numberItem, integerItem, boolItem, arrayItem);
+    return Objects.hash(stringItem, numberItem, floatItem, integerItem, boolItem, arrayItem);
   }
 
 
@@ -212,6 +242,7 @@ public class TypeHolderExample {
     sb.append("class TypeHolderExample {\n");
     sb.append("    stringItem: ").append(toIndentedString(stringItem)).append("\n");
     sb.append("    numberItem: ").append(toIndentedString(numberItem)).append("\n");
+    sb.append("    floatItem: ").append(toIndentedString(floatItem)).append("\n");
     sb.append("    integerItem: ").append(toIndentedString(integerItem)).append("\n");
     sb.append("    boolItem: ").append(toIndentedString(boolItem)).append("\n");
     sb.append("    arrayItem: ").append(toIndentedString(arrayItem)).append("\n");