fix(jul): Handle null messages with resource bundles

Skip resource-bundle lookup and message formatting when a JUL record has no message. Preserve event and breadcrumb capture instead of aborting with a null-pointer exception.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: adinauer

sentry-jul/src/main/java/io/sentry/jul/SentryHandler.java

@@ -28,6 +28,7 @@
 import java.util.Date;
 import java.util.List;
 import java.util.Map;
+import java.util.ResourceBundle;
 import java.util.logging.ErrorManager;
 import java.util.logging.Filter;
 import java.util.logging.Handler;
@@ -295,13 +296,16 @@ SentryEvent createEvent(final @NotNull LogRecord record) {
     final Message sentryMessage = new Message();
     sentryMessage.setParams(toParams(record.getParameters()));
 
-    String message = record.getMessage();
-    if (record.getResourceBundle() != null
-        && record.getResourceBundle().containsKey(record.getMessage())) {
-      message = record.getResourceBundle().getString(record.getMessage());
+    final @Nullable String messageTemplate = record.getMessage();
+    final @Nullable ResourceBundle resourceBundle = record.getResourceBundle();
+    @Nullable String message = messageTemplate;
+    if (messageTemplate != null
+        && resourceBundle != null
+        && resourceBundle.containsKey(messageTemplate)) {
+      message = resourceBundle.getString(messageTemplate);
     }
     sentryMessage.setMessage(message);
-    if (record.getParameters() != null) {
+    if (message != null && record.getParameters() != null) {
       try {
         sentryMessage.setFormatted(formatMessage(message, record.getParameters()));
       } catch (RuntimeException e) {

sentry-jul/src/test/kotlin/io/sentry/jul/SentryHandlerTest.kt

@@ -16,7 +16,9 @@ import io.sentry.transport.ITransport
 import java.time.Instant
 import java.time.LocalDateTime
 import java.time.ZoneId
+import java.util.ListResourceBundle
 import java.util.logging.Level
+import java.util.logging.LogRecord
 import java.util.logging.Logger
 import kotlin.test.AfterTest
 import kotlin.test.BeforeTest
@@ -510,6 +512,40 @@ class SentryHandlerTest {
     verify(fixture.transport, never()).send(checkLogs {})
   }
 
+  @Test
+  fun `captures null message as event and breadcrumb when resource bundle is set`() {
+    fixture =
+      Fixture(
+        minimumBreadcrumbLevel = Level.INFO,
+        minimumEventLevel = Level.SEVERE,
+        enableLogs = true,
+      )
+    val resourceBundle =
+      object : ListResourceBundle() {
+        override fun getContents(): Array<Array<Any>> =
+          arrayOf(arrayOf<Any>("message", "localized message"))
+      }
+
+    fixture.handler.publish(
+      LogRecord(Level.INFO, null).apply { this.resourceBundle = resourceBundle }
+    )
+    fixture.handler.publish(
+      LogRecord(Level.SEVERE, null).apply { this.resourceBundle = resourceBundle }
+    )
+    Sentry.flush(10)
+
+    verify(fixture.transport)
+      .send(
+        checkEvent { event ->
+          assertNull(event.message?.message)
+          assertEquals(1, event.breadcrumbs?.size)
+          assertNull(event.breadcrumbs?.single()?.message)
+        },
+        anyOrNull(),
+      )
+    verify(fixture.transport, never()).send(checkLogs {})
+  }
+
   @Test
   fun `converts finest log level to Sentry log level`() {
     fixture = Fixture(minimumLevel = Level.FINEST)