[#1830] Fix wrong name for PCData elements when using xjc in dtd mode (#1831)

* Added failing test to prove that method name does not respect java naming convetion

see #1830

Signed-off-by: Benjamin Asbach <asbachb@users.noreply.github.com>

* For PCData generate a value named `"Value"`

This will be used to generate the getter methods later on.

This fixes #1830

Signed-off-by: Benjamin Asbach <asbachb@users.noreply.github.com>

---------

Signed-off-by: Benjamin Asbach <asbachb@users.noreply.github.com>
Co-authored-by: Benjamin Asbach <asbachb@users.noreply.github.com>
Co-authored-by: Lukas Jungmann <lukas.jungmann@oracle.com>

Author: asbachb

jaxb-ri/xjc/src/main/java/com/sun/tools/xjc/reader/dtd/Element.java

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 1997, 2021 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2025 Contributors to the Eclipse Foundation. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Distribution License v. 1.0, which is available at
@@ -223,7 +224,7 @@ void bind() {
 
             if(ci!=null) {
                 // if this element is mapped to a class, just put one property
-                CValuePropertyInfo p = new CValuePropertyInfo("value", null,null/*TODO*/,locator,getConversion(),null);
+                CValuePropertyInfo p = new CValuePropertyInfo("Value", null,null/*TODO*/,locator,getConversion(),null);
                 ci.addProperty(p);
             }
             return;

jaxb-ri/xjc/src/test/java/com/sun/tools/xjc/XjcDtdPluginTest.java

@@ -12,6 +12,7 @@
 package com.sun.tools.xjc;
 
 import com.sun.codemodel.JCodeModel;
+import com.sun.codemodel.JMethod;
 import com.sun.tools.xjc.Driver.OptionsEx;
 import com.sun.tools.xjc.model.Model;
 import com.sun.tools.xjc.outline.Outline;
@@ -102,4 +103,27 @@ public void testIssue_cannotRenderJavadocForLists() throws Exception {
         );
         model.generateCode(opt, null);
     }
+
+    @Test
+    public void testIssue_PCDataNoCamelCase() throws Exception {
+        final OptionsEx opt = new OptionsEx();
+        opt.setSchemaLanguage(Language.DTD);
+        opt.compatibilityMode = Options.EXTENSION;
+
+        opt.addGrammar(
+                new InputSource(
+                        XjcDtdPluginTest.class.getResourceAsStream("/schemas/issue1830/pcdata_no_camelcase.dtd")
+                )
+        );
+
+        Model model = ModelLoader.load(
+                opt,
+                new JCodeModel(),
+                null
+        );
+        model.generateCode(opt, null);
+        JMethod getValueMethod = model.codeModel._getClass("generated.AnElement").methods().iterator().next();
+
+        Assert.assertEquals("getValue", getValueMethod.name());
+    }
 }

jaxb-ri/xjc/src/test/resources/schemas/issue1830/pcdata_no_camelcase.dtd

@@ -0,0 +1,12 @@
+<!--
+
+    Copyright (c) 2025 Contributors to the Eclipse Foundation. All rights reserved.
+
+    This program and the accompanying materials are made available under the
+    terms of the Eclipse Distribution License v. 1.0, which is available at
+    http://www.eclipse.org/org/documents/edl-v10.php.
+
+    SPDX-License-Identifier: BSD-3-Clause
+
+-->
+<!ELEMENT AnElement (#PCDATA)>