Add uncaught exception handler

service/src/main/java/org/whispersystems/textsecuregcm/util/logging/UncaughtExceptionHandler.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2021 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.whispersystems.textsecuregcm.util.logging;
+
+import javax.annotation.Nullable;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class UncaughtExceptionHandler {
+
+  private static final Logger logger = LoggerFactory.getLogger(UncaughtExceptionHandler.class);
+
+  public static void register() {
+    @Nullable final Thread.UncaughtExceptionHandler current = Thread.getDefaultUncaughtExceptionHandler();
+
+    if (current != null) {
+      logger.warn("Uncaught exception handler already exists: {}", current);
+      return;
+    }
+
+    Thread.setDefaultUncaughtExceptionHandler((t, e) -> logger.error("Uncaught exception on thread {}", t, e));
+  }
+
+}