feat: disable deprecated Graph editor tab by default

CHANGELOG.md

@@ -6,6 +6,7 @@
 
 ### Changed
 
+- Disable the deprecated Graph editor tab by default; opt in with JVM property `-Dcom.intellij.struts2.enableGraphEditor=true`
 - Update `platformVersion` to `2026.1`
 - Change since/until build to `261-261.*` (2026.1 only)
 - Dependencies - upgrade `org.jetbrains.intellij.platform` to `2.13.1`

README.md

@@ -28,6 +28,20 @@ Provides full integration of Apache Struts 2.
 Questions related to the usage of the plugin should be posted to the [user mailing list](https://struts.apache.org/mail.html).
 Any issues should be reported using JIRA and [IDEA plugin](https://issues.apache.org/jira/issues/?jql=project%20%3D%20WW%20AND%20component%20%3D%20%22IDEA%20Plugin%22) component.
 
+## Optional features
+
+### Graph editor tab (disabled by default)
+
+The plugin includes a visual graph view for `struts.xml` configuration files. This feature uses a deprecated IntelliJ Platform API and is disabled by default because it can cause IDE freezes on newer platform versions.
+
+To enable it, add the following JVM property via **Help | Edit Custom VM Options**:
+
+```
+-Dcom.intellij.struts2.enableGraphEditor=true
+```
+
+Restart the IDE after adding the property. The `Graph` tab will then appear when opening `struts.xml` files that are part of a Struts file set.
+
 ## Testing
 
 Tests are located in `src/test/java` and use IntelliJ Platform test frameworks (`LightJavaCodeInsightFixtureTestCase` and similar). Test data fixtures are in `src/test/testData`.

src/main/java/com/intellij/struts2/graph/fileEditor/Struts2GraphFileEditorProvider.java

@@ -37,8 +37,22 @@
  */
 public class Struts2GraphFileEditorProvider extends PerspectiveFileEditorProvider {
 
+  /**
+   * JVM system property to opt in to the (deprecated) Graph editor tab.
+   * Disabled by default; enable with {@code -Dcom.intellij.struts2.enableGraphEditor=true}.
+   */
+  static final String GRAPH_EDITOR_ENABLED_PROPERTY = "com.intellij.struts2.enableGraphEditor";
+
+  static boolean isGraphEditorEnabled() {
+    return Boolean.getBoolean(GRAPH_EDITOR_ENABLED_PROPERTY);
+  }
+
   @Override
   public boolean accept(@NotNull final Project project, @NotNull final VirtualFile file) {
+    if (!isGraphEditorEnabled()) {
+      return false;
+    }
+
     if (!file.isValid()) {
       return false;
     }