diff --git a/java/rocksjni/options.cc b/java/rocksjni/options.cc
index d5dc2f0676f..a6120f67dca 100644
--- a/java/rocksjni/options.cc
+++ b/java/rocksjni/options.cc
@@ -3917,7 +3917,7 @@ jlongArray Java_org_rocksdb_Options_tablePropertiesCollectorFactory(
     // exception thrown: OutOfMemoryError
     return nullptr;
   }
-  jlong* buf = env->GetLongArrayElements(retVal, NULL);
+  jlong* buf = env->GetLongArrayElements(retVal, nullptr);
   if (buf == nullptr) {
     // exception thrown: OutOfMemoryError
     return nullptr;
@@ -3943,7 +3943,7 @@ void Java_org_rocksdb_Options_setTablePropertiesCollectorFactory(
   auto* opt = reinterpret_cast<ROCKSDB_NAMESPACE::Options*>(jhandle);
   const jsize size = env->GetArrayLength(j_factory_handles);
 
-  jlong* buf = env->GetLongArrayElements(j_factory_handles, NULL);
+  jlong* buf = env->GetLongArrayElements(j_factory_handles, nullptr);
   if (buf == nullptr) {
     // exception thrown: OutOfMemoryError
     return;
diff --git a/java/rocksjni/portal.h b/java/rocksjni/portal.h
index 8a95b995e56..29b74733137 100644
--- a/java/rocksjni/portal.h
+++ b/java/rocksjni/portal.h
@@ -1689,7 +1689,7 @@ class JniUtil {
     } else if (env_rs == JNI_EDETACHED) {
       // current thread is not attached, attempt to attach
       const jint rs_attach =
-          jvm->AttachCurrentThread(reinterpret_cast<void**>(&env), NULL);
+          jvm->AttachCurrentThread(reinterpret_cast<void**>(&env), nullptr);
       if (rs_attach == JNI_OK) {
         *attached = JNI_TRUE;
         return env;
diff --git a/java/rocksjni/ttl.cc b/java/rocksjni/ttl.cc
index 8e23c10279b..4ab0854f502 100644
--- a/java/rocksjni/ttl.cc
+++ b/java/rocksjni/ttl.cc
@@ -145,7 +145,7 @@ jlongArray Java_org_rocksdb_TtlDB_openCF(JNIEnv* env, jclass, jlong jopt_handle,
     return jresults;
   } else {
     ROCKSDB_NAMESPACE::RocksDBExceptionJni::ThrowNew(env, s);
-    return NULL;
+    return nullptr;
   }
 }