[Java] Getter/Setter naming convention not followed in generated models (#2095)

fix the getter/setter when the second letter of the field name is already uppercase (following the JavaBeans API specification)

modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java

@@ -1551,7 +1551,7 @@ public class DefaultCodegen implements CodegenConfig {
     }
 
     /**
-     * Output the Getter name, e.g. getSize
+     * Output the Setter name, e.g. setSize
      *
      * @param name the name of the property
      * @return setter name based on naming convention

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java

@@ -1378,10 +1378,12 @@ public abstract class AbstractJavaCodegen extends DefaultCodegen implements Code
         this.supportJava6 = value;
     }
 
+    @Override
     public String toRegularExpression(String pattern) {
         return escapeText(pattern);
     }
 
+    @Override
     public boolean convertPropertyToBoolean(String propertyKey) {
         boolean booleanValue = false;
         if (additionalProperties.containsKey(propertyKey)) {
@@ -1391,6 +1393,7 @@ public abstract class AbstractJavaCodegen extends DefaultCodegen implements Code
         return booleanValue;
     }
 
+    @Override
     public void writePropertyBack(String propertyKey, boolean value) {
         additionalProperties.put(propertyKey, value);
     }
@@ -1416,6 +1419,33 @@ public abstract class AbstractJavaCodegen extends DefaultCodegen implements Code
         return tag;
     }
 
+    /**
+     * Camelize the method name of the getter and setter
+     *
+     * @param name string to be camelized
+     * @return Camelized string
+     */
+    @Override
+    public String getterAndSetterCapitalize(String name) {
+        boolean lowercaseFirstLetter = false;
+        if (name == null || name.length() == 0) {
+            return name;
+        }
+        name = toVarName(name);
+        //
+        // Let the property name capitalized
+        // except when the first letter of the property name is lowercase and the second letter is uppercase
+        // Refer to section 8.8: Capitalization of inferred names of the JavaBeans API specification
+        // http://download.oracle.com/otn-pub/jcp/7224-javabeans-1.01-fr-spec-oth-JSpec/beans.101.pdf)
+        //
+        if (name.length() > 1 && Character.isLowerCase(name.charAt(0)) && Character.isUpperCase(name.charAt(1))) {
+            lowercaseFirstLetter = true;
+        }
+        return camelize(name, lowercaseFirstLetter);
+    }
+
+
+
     @Override
     public void postProcessFile(File file, String fileType) {
         if (file == null) {

modules/openapi-generator/src/test/java/org/openapitools/codegen/java/JavaModelTest.java

@@ -225,7 +225,7 @@ public class JavaModelTest {
         Assert.assertTrue(property.isContainer);
     }
 
-    @Test(description = "convert a model with restriced characters")
+    @Test(description = "convert a model with restricted characters")
     public void restrictedCharactersPropertiesTest() {
         final Schema schema = new Schema()
                 .description("a sample model")
@@ -466,8 +466,8 @@ public class JavaModelTest {
 
         final CodegenProperty property = cm.vars.get(0);
         Assert.assertEquals(property.baseName, "pId");
-        Assert.assertEquals(property.getter, "getPId");
-        Assert.assertEquals(property.setter, "setPId");
+        Assert.assertEquals(property.getter, "getpId");
+        Assert.assertEquals(property.setter, "setpId");
         Assert.assertEquals(property.dataType, "String");
         Assert.assertEquals(property.name, "pId");
         Assert.assertEquals(property.defaultValue, null);
@@ -505,6 +505,34 @@ public class JavaModelTest {
         Assert.assertFalse(property.isContainer);
     }
 
+    @Test(description = "convert a model with an all upper-case letter and one non letter property names")
+    public void allUpperCaseOneNonLetterNamesTest() {
+        final Schema schema = new Schema()
+                .description("a model with a property name starting with two upper-case letters")
+                .addProperties("ATT_NAME", new StringSchema())
+                .addRequiredItem("ATT_NAME");
+        final DefaultCodegen codegen = new JavaClientCodegen();
+        OpenAPI openAPI = TestUtils.createOpenAPIWithOneSchema("sample", schema);
+        codegen.setOpenAPI(openAPI);
+        final CodegenModel cm = codegen.fromModel("sample", schema);
+
+        Assert.assertEquals(cm.name, "sample");
+        Assert.assertEquals(cm.classname, "Sample");
+        Assert.assertEquals(cm.vars.size(), 1);
+
+        final CodegenProperty property = cm.vars.get(0);
+        Assert.assertEquals(property.baseName, "ATT_NAME");
+        Assert.assertEquals(property.getter, "getATTNAME");
+        Assert.assertEquals(property.setter, "setATTNAME");
+        Assert.assertEquals(property.dataType, "String");
+        Assert.assertEquals(property.name, "ATT_NAME");
+        Assert.assertEquals(property.defaultValue, null);
+        Assert.assertEquals(property.baseType, "String");
+        Assert.assertFalse(property.hasMore);
+        Assert.assertTrue(property.required);
+        Assert.assertFalse(property.isContainer);
+    }
+
     @Test(description = "convert hyphens per issue 503")
     public void hyphensTest() {
         final Schema schema = new Schema()