Update Dagger tests to support JDK 24.

https://bugs.openjdk.org/browse/JDK-8338678 is fixed in JDK 24, which now gives more information than we had when reporting errors in previous JDKs. This CL updates our Dagger tests to support JDK 24.

RELNOTES=N/A
PiperOrigin-RevId: 678052093

javatests/dagger/internal/codegen/DaggerSuperficialValidationTest.java

@@ -124,8 +124,17 @@ public void missingGenericReturnType() {
               assertThrows(
                   ValidationException.KnownErrorType.class,
                   () -> superficialValidation.validateElement(testClassElement));
-          // TODO(b/248552462): Javac and KSP should match once this bug is fixed.
-          boolean isJavac = processingEnv.getBackend() == XProcessingEnv.Backend.JAVAC;
+          final String errorType;
+          if (processingEnv.getBackend() == XProcessingEnv.Backend.JAVAC) {
+            // JDK 24 improves error type information.
+            errorType =
+                Runtime.version().feature() >= 24
+                    ? isKAPT(processingEnv) ? "MissingType" : "MissingType<?>"
+                    : "<any>";
+          } else {
+            // TODO(b/248552462): Javac and KSP should match once this bug is fixed.
+            errorType = "error.NonExistentClass";
+          }
           assertThat(exception)
               .hasMessageThat()
               .contains(
@@ -135,7 +144,7 @@ public void missingGenericReturnType() {
                           "  => element (CLASS): test.TestClass",
                           "  => element (METHOD): blah()",
                           "  => type (ERROR return type): %1$s"),
-                      isJavac ? "<any>" : "error.NonExistentClass"));
+                      errorType));
         });
   }
 
@@ -165,8 +174,14 @@ public void missingReturnTypeTypeParameter() {
               assertThrows(
                   ValidationException.KnownErrorType.class,
                   () -> superficialValidation.validateElement(testClassElement));
-          // TODO(b/248552462): Javac and KSP should match once this bug is fixed.
-          boolean isJavac = processingEnv.getBackend() == XProcessingEnv.Backend.JAVAC;
+          final String errorType;
+          if (processingEnv.getBackend() == XProcessingEnv.Backend.JAVAC) {
+            // JDK 24 improves error type information.
+            errorType = Runtime.version().feature() >= 24 ? "MissingType<?>" : "<any>";
+          } else {
+            // TODO(b/248552462): Javac and KSP should match once this bug is fixed.
+            errorType = "error.NonExistentClass";
+          }
           assertThat(exception)
               .hasMessageThat()
               .contains(
@@ -178,7 +193,7 @@ public void missingReturnTypeTypeParameter() {
                           "  => type (DECLARED return type): "
                               + "java.util.Map<java.util.Set<?>,%1$s>",
                           "  => type (ERROR type argument): %1$s"),
-                      isJavac ? "<any>" : "error.NonExistentClass"));
+                      errorType));
         });
   }