Make Groovy major version parsing more robust for groovy-eclipse-compiler

Author: AndreasTu

docs/release_notes.adoc

@@ -6,6 +6,11 @@ include::include.adoc[]
 
 == 2.5 (tbd)
 
+
+=== Misc
+
+* Make Groovy major version parsing more robust for groovy-eclipse-compiler spockIssue:2282[]
+
 == 2.4 (2025-12-11)
 
 _This is a summary of the highlights of the milestone releases_

spock-core/src/main/java/org/spockframework/runtime/GroovyRuntimeUtil.java

@@ -42,10 +42,30 @@ public abstract class GroovyRuntimeUtil {
   private static final String GET = "get";
   private static final String IS = "is";
 
+  /**
+   * Fallback Groovy version used, when the parsing of the real Groovy version fails.
+   */
+  private static final int GROOVY_DEFAULT_FALLBACK_VERSION = 4;
   @Internal
-  public static final int MAJOR_VERSION = parseInt(GroovySystem.getVersion().split("\\.", 2)[0]);
+  public static final int MAJOR_VERSION = parseGroovyMajorVersion();
   public static Object[] EMPTY_ARGUMENTS = new Object[0];
 
+  /**
+   * See <a href="https://github.com/spockframework/spock/issues/2282">Issue2282</a>.
+   *
+   * @return The Groovy major version or {@link #GROOVY_DEFAULT_FALLBACK_VERSION} if the parsing failed.
+   */
+  private static int parseGroovyMajorVersion() {
+    String version = GroovySystem.getVersion();
+    if (version != null && !version.isEmpty()) {
+      try {
+        return parseInt(version.split("\\.", 2)[0]);
+      } catch (Exception ignored) {
+      }
+    }
+    return GROOVY_DEFAULT_FALLBACK_VERSION;
+  }
+
   public static boolean isTruthy(Object obj) {
     return DefaultTypeTransformation.castToBoolean(obj);
   }
@@ -306,7 +326,7 @@ public static boolean isVoidMethod(@Nullable Object target, String method, Objec
     // in the end it's probably best to rely on NullAwareInvokeMethodSpec to tell us if
     // everything is OK
     MetaClass metaClass = target instanceof Class ?
-        InvokerHelper.getMetaClass((Class) target) : InvokerHelper.getMetaClass(target);
+      InvokerHelper.getMetaClass((Class) target) : InvokerHelper.getMetaClass(target);
 
     // seems to find more methods than getMetaMethod()
     MetaMethod metaMethod = metaClass.pickMethod(method, argTypes);