fix(java): honor case-insensitive matching for formatted inner enums (#24937)

Convert formatted string enum values to strings for case-insensitive
comparison, handling null inputs safely. Preserve existing equality
when the option is disabled and for non-string enums.

Add compilation and runtime regression coverage across 13 generator
and library configurations.

Author: KannaKim

modules/openapi-generator/src/main/resources/Java/libraries/microprofile/enumClass.mustache

@@ -73,7 +73,7 @@
     @JsonCreator
         public static {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} fromValue({{{dataType}}} value) {
             for ({{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} b : {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}}.values()) {
-                if (b.value.equals{{#isString}}{{#useEnumCaseInsensitive}}IgnoreCase{{/useEnumCaseInsensitive}}{{/isString}}(value)) {
+                if ({{#isString}}{{#useEnumCaseInsensitive}}b.value{{#dataFormat}}.toString(){{/dataFormat}}.equalsIgnoreCase({{#dataFormat}}value == null ? null : value.toString(){{/dataFormat}}{{^dataFormat}}value{{/dataFormat}}){{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}b.value.equals(value){{/useEnumCaseInsensitive}}{{/isString}}{{^isString}}b.value.equals(value){{/isString}}) {
                     return b;
                 }
             }

modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/modelInnerEnum.mustache

@@ -39,7 +39,7 @@
 
     public static {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} fromValue({{{dataType}}} value) {
       for ({{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} b : {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}}.values()) {
-        if (b.value.equals{{#isString}}{{#useEnumCaseInsensitive}}IgnoreCase{{/useEnumCaseInsensitive}}{{/isString}}(value)) {
+        if ({{#isString}}{{#useEnumCaseInsensitive}}b.value{{#dataFormat}}.toString(){{/dataFormat}}.equalsIgnoreCase({{#dataFormat}}value == null ? null : value.toString(){{/dataFormat}}{{^dataFormat}}value{{/dataFormat}}){{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}b.value.equals(value){{/useEnumCaseInsensitive}}{{/isString}}{{^isString}}b.value.equals(value){{/isString}}) {
           return b;
         }
       }

modules/openapi-generator/src/main/resources/Java/modelInnerEnum.mustache

@@ -51,7 +51,7 @@
 {{/jackson}}
     public static {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} fromValue({{{dataType}}} value) {
       for ({{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} b : {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}}.values()) {
-        if (b.value.equals{{#isString}}{{#useEnumCaseInsensitive}}IgnoreCase{{/useEnumCaseInsensitive}}{{/isString}}(value)) {
+        if ({{#isString}}{{#useEnumCaseInsensitive}}b.value{{#dataFormat}}.toString(){{/dataFormat}}.equalsIgnoreCase({{#dataFormat}}value == null ? null : value.toString(){{/dataFormat}}{{^dataFormat}}value{{/dataFormat}}){{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}b.value.equals(value){{/useEnumCaseInsensitive}}{{/isString}}{{^isString}}b.value.equals(value){{/isString}}) {
           return b;
         }
       }

modules/openapi-generator/src/main/resources/JavaJaxRS/cxf-cdi/enumClass.mustache

@@ -26,7 +26,7 @@
 
     public static {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} fromValue({{dataType}} value) {
         for ({{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} b : {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}}.values()) {
-            if (b.value.equals{{#isString}}{{#useEnumCaseInsensitive}}IgnoreCase{{/useEnumCaseInsensitive}}{{/isString}}(value)) {
+            if ({{#isString}}{{#useEnumCaseInsensitive}}b.value{{#dataFormat}}.toString(){{/dataFormat}}.equalsIgnoreCase({{#dataFormat}}value == null ? null : value.toString(){{/dataFormat}}{{^dataFormat}}value{{/dataFormat}}){{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}b.value.equals(value){{/useEnumCaseInsensitive}}{{/isString}}{{^isString}}b.value.equals(value){{/isString}}) {
                 return b;
             }
         }

modules/openapi-generator/src/main/resources/JavaJaxRS/cxf-ext/enumClass.mustache

@@ -26,7 +26,7 @@
 
     public static {{datatypeWithEnum}} fromValue({{dataType}} value) {
         for ({{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} b : {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}}.values()) {
-            if (b.value.equals{{#isString}}{{#useEnumCaseInsensitive}}IgnoreCase{{/useEnumCaseInsensitive}}{{/isString}}(value)) {
+            if ({{#isString}}{{#useEnumCaseInsensitive}}b.value{{#dataFormat}}.toString(){{/dataFormat}}.equalsIgnoreCase({{#dataFormat}}value == null ? null : value.toString(){{/dataFormat}}{{^dataFormat}}value{{/dataFormat}}){{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}b.value.equals(value){{/useEnumCaseInsensitive}}{{/isString}}{{^isString}}b.value.equals(value){{/isString}}) {
                 return b;
             }
         }

modules/openapi-generator/src/main/resources/JavaJaxRS/cxf/enumClass.mustache

@@ -32,7 +32,7 @@
     {{/jackson}}
     public static {{datatypeWithEnum}} fromValue({{dataType}} value) {
         for ({{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} b : {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}}.values()) {
-            if (b.value.equals{{#isString}}{{#useEnumCaseInsensitive}}IgnoreCase{{/useEnumCaseInsensitive}}{{/isString}}(value)) {
+            if ({{#isString}}{{#useEnumCaseInsensitive}}b.value{{#dataFormat}}.toString(){{/dataFormat}}.equalsIgnoreCase({{#dataFormat}}value == null ? null : value.toString(){{/dataFormat}}{{^dataFormat}}value{{/dataFormat}}){{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}b.value.equals(value){{/useEnumCaseInsensitive}}{{/isString}}{{^isString}}b.value.equals(value){{/isString}}) {
                 return b;
             }
         }

modules/openapi-generator/src/main/resources/JavaJaxRS/enumClass.mustache

@@ -49,7 +49,7 @@
     @JsonCreator
     public static {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} fromValue({{{dataType}}} value) {
       for ({{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} b : {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}}.values()) {
-        if (b.value.equals{{#isString}}{{#useEnumCaseInsensitive}}IgnoreCase{{/useEnumCaseInsensitive}}{{/isString}}(value)) {
+        if ({{#isString}}{{#useEnumCaseInsensitive}}b.value{{#dataFormat}}.toString(){{/dataFormat}}.equalsIgnoreCase({{#dataFormat}}value == null ? null : value.toString(){{/dataFormat}}{{^dataFormat}}value{{/dataFormat}}){{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}b.value.equals(value){{/useEnumCaseInsensitive}}{{/isString}}{{^isString}}b.value.equals(value){{/isString}}) {
           return b;
         }
       }

modules/openapi-generator/src/main/resources/JavaJaxRS/spec/enumClass.mustache

@@ -46,7 +46,7 @@
     @JsonCreator
     public static {{datatypeWithEnum}} fromValue({{dataType}} value) {
         for ({{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} b : {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}}.values()) {
-            if (b.value.equals{{#isString}}{{#useEnumCaseInsensitive}}IgnoreCase{{/useEnumCaseInsensitive}}{{/isString}}(value)) {
+            if ({{#isString}}{{#useEnumCaseInsensitive}}b.value{{#dataFormat}}.toString(){{/dataFormat}}.equalsIgnoreCase({{#dataFormat}}value == null ? null : value.toString(){{/dataFormat}}{{^dataFormat}}value{{/dataFormat}}){{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}b.value.equals(value){{/useEnumCaseInsensitive}}{{/isString}}{{^isString}}b.value.equals(value){{/isString}}) {
                 return b;
             }
         }

modules/openapi-generator/src/main/resources/JavaPlayFramework/enumClass.mustache

@@ -35,7 +35,7 @@
     @JsonCreator
     public static {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} fromValue({{{dataType}}} value) {
       for ({{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} b : {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}}.values()) {
-        if (b.value.equals{{#isString}}{{#useEnumCaseInsensitive}}IgnoreCase{{/useEnumCaseInsensitive}}{{/isString}}(value)) {
+        if ({{#isString}}{{#useEnumCaseInsensitive}}b.value{{#dataFormat}}.toString(){{/dataFormat}}.equalsIgnoreCase({{#dataFormat}}value == null ? null : value.toString(){{/dataFormat}}{{^dataFormat}}value{{/dataFormat}}){{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}b.value.equals(value){{/useEnumCaseInsensitive}}{{/isString}}{{^isString}}b.value.equals(value){{/isString}}) {
           return b;
         }
       }

modules/openapi-generator/src/main/resources/JavaSpring/enumClass.mustache

@@ -53,7 +53,7 @@
     @JsonCreator
     public static {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} fromValue({{{dataType}}} value) {
       for ({{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} b : {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}}.values()) {
-        if (b.value.equals{{#isString}}{{#useEnumCaseInsensitive}}IgnoreCase{{/useEnumCaseInsensitive}}{{/isString}}(value)) {
+        if ({{#isString}}{{#useEnumCaseInsensitive}}b.value{{#dataFormat}}.toString(){{/dataFormat}}.equalsIgnoreCase({{#dataFormat}}value == null ? null : value.toString(){{/dataFormat}}{{^dataFormat}}value{{/dataFormat}}){{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}b.value.equals(value){{/useEnumCaseInsensitive}}{{/isString}}{{^isString}}b.value.equals(value){{/isString}}) {
           return b;
         }
       }