From b308b106e3f74da8be249ff00f500dd7cc4304ba Mon Sep 17 00:00:00 2001
From: Tobrun <tobrun.van.nuland@gmail.com>
Date: Thu, 5 Apr 2018 22:37:45 +0200
Subject: [android] - add delete local refs calls for make jni strings

---
 platform/android/src/offline/offline_manager.cpp     |  8 ++++++--
 platform/android/src/offline/offline_region.cpp      | 12 +++++++++---
 platform/android/src/snapshotter/map_snapshotter.cpp |  4 +++-
 3 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/platform/android/src/offline/offline_manager.cpp b/platform/android/src/offline/offline_manager.cpp
index 02871e7fdf..4960ae2845 100644
--- a/platform/android/src/offline/offline_manager.cpp
+++ b/platform/android/src/offline/offline_manager.cpp
@@ -102,7 +102,9 @@ void OfflineManager::ListOfflineRegionsCallback::onError(jni::JNIEnv& env,
                                                           std::exception_ptr error) {
     static auto method = javaClass.GetMethod<void (jni::String)>(env, "onError");
     std::string message = mbgl::util::toString(error);
-    callback.Call(env, method, jni::Make<jni::String>(env, message));
+    auto jmessage = jni::Make<jni::String>(env, message);
+    callback.Call(env, method, jmessage);
+    jni::DeleteLocalRef(env, jmessage);
 }
 
 void OfflineManager::ListOfflineRegionsCallback::onList(jni::JNIEnv& env,
@@ -138,7 +140,9 @@ void OfflineManager::CreateOfflineRegionCallback::onError(jni::JNIEnv& env,
                                                           std::exception_ptr error) {
     static auto method = javaClass.GetMethod<void (jni::String)>(env, "onError");
     std::string message = mbgl::util::toString(error);
-    callback.Call(env, method, jni::Make<jni::String>(env, message));
+    auto jmessage = jni::Make<jni::String>(env, message);
+    callback.Call(env, method, jmessage);
+    jni::DeleteLocalRef(env, jmessage);
 }
 
 void OfflineManager::CreateOfflineRegionCallback::onCreate(jni::JNIEnv& env,
diff --git a/platform/android/src/offline/offline_region.cpp b/platform/android/src/offline/offline_region.cpp
index 856434d266..27de76fb00 100644
--- a/platform/android/src/offline/offline_region.cpp
+++ b/platform/android/src/offline/offline_region.cpp
@@ -239,7 +239,9 @@ void OfflineRegion::OfflineRegionStatusCallback::onError(jni::JNIEnv& env,
                                                           std::exception_ptr error) {
     static auto method = javaClass.GetMethod<void (jni::String)>(env, "onError");
     std::string message = mbgl::util::toString(error);
-    callback.Call(env, method, jni::Make<jni::String>(env, message));
+    auto jmessage = jni::Make<jni::String>(env, message);
+    callback.Call(env, method, jmessage);
+    jni::DeleteLocalRef(env, jmessage);
 }
 
 void OfflineRegion::OfflineRegionStatusCallback::onStatus(jni::JNIEnv& env,
@@ -267,7 +269,9 @@ void OfflineRegion::OfflineRegionDeleteCallback::onError(jni::JNIEnv& env,
                                                           std::exception_ptr error) {
     static auto method = javaClass.GetMethod<void (jni::String)>(env, "onError");
     std::string message = mbgl::util::toString(error);
-    callback.Call(env, method, jni::Make<jni::String>(env, message));
+    auto jmessage = jni::Make<jni::String>(env, message);
+    callback.Call(env, method, jmessage);
+    jni::DeleteLocalRef(env, jmessage);
 }
 
 void OfflineRegion::OfflineRegionDeleteCallback::onDelete(jni::JNIEnv& env, jni::Object<OfflineRegion::OfflineRegionDeleteCallback> callback) {
@@ -289,7 +293,9 @@ void OfflineRegion::OfflineRegionUpdateMetadataCallback::onError(jni::JNIEnv& en
                                                           std::exception_ptr error) {
     static auto method = javaClass.GetMethod<void (jni::String)>(env, "onError");
     std::string message = mbgl::util::toString(error);
-    callback.Call(env, method, jni::Make<jni::String>(env, message));
+    auto jmessage = jni::Make<jni::String>(env, message);
+    callback.Call(env, method, jmessage);
+    jni::DeleteLocalRef(env, jmessage);
 }
 
 void OfflineRegion::OfflineRegionUpdateMetadataCallback::onUpdate(jni::JNIEnv& env,
diff --git a/platform/android/src/snapshotter/map_snapshotter.cpp b/platform/android/src/snapshotter/map_snapshotter.cpp
index 71f8b4f4c0..a006953d36 100644
--- a/platform/android/src/snapshotter/map_snapshotter.cpp
+++ b/platform/android/src/snapshotter/map_snapshotter.cpp
@@ -71,7 +71,9 @@ void MapSnapshotter::start(JNIEnv& env) {
         if (err) {
             // error handler callback
             static auto onSnapshotFailed = javaClass.GetMethod<void (jni::String)>(*_env, "onSnapshotFailed");
-            javaPeer->Call(*_env, onSnapshotFailed, jni::Make<jni::String>(*_env, util::toString(err)));
+            auto message = jni::Make<jni::String>(*_env, util::toString(err));
+            javaPeer->Call(*_env, onSnapshotFailed, message);
+            jni::DeleteLocalRef(*_env, message);
         } else {
             // Create the wrapper
             auto mapSnapshot = android::MapSnapshot::New(*_env, std::move(image), pixelRatio, attributions, showLogo, pointForFn);
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