fix java bugs

mindspore/lite/java/java/app/src/main/native/runtime/ms_config.cpp

@@ -14,16 +14,12 @@
  * limitations under the License.
  */
 
-
 #include <jni.h>
 #include "common/ms_log.h"
 #include "include/context.h"
 
-extern "C" JNIEXPORT jlong JNICALL Java_com_mindspore_lite_config_MSConfig_createMSConfig(JNIEnv *env, jobject thiz,
-                                                                                          jint device_type,
-                                                                                          jint thread_num,
-                                                                                          jint cpu_bind_mode,
-                                                                                          jboolean enable_float16) {
+extern "C" JNIEXPORT jlong JNICALL Java_com_mindspore_lite_config_MSConfig_createMSConfig(
+  JNIEnv *env, jobject thiz, jint device_type, jint thread_num, jint cpu_bind_mode, jboolean enable_float16) {
   auto *context = new (std::nothrow) mindspore::lite::Context();
   if (context == nullptr) {
     MS_LOGE("new Context fail!");
@@ -35,11 +31,13 @@ extern "C" JNIEXPORT jlong JNICALL Java_com_mindspore_lite_config_MSConfig_creat
     case 0:
       context->device_list_[0].device_type_ = mindspore::lite::DT_CPU;
       break;
-    case 1:
-      context->device_list_[0].device_type_ = mindspore::lite::DT_GPU;
+    case 1:  // DT_GPU
+      MS_LOGE("We only support CPU now.");
+      return (jlong)context;
       break;
-    case 2:
-      context->device_list_[0].device_type_ = mindspore::lite::DT_NPU;
+    case 2:  // DT_NPU
+      MS_LOGE("We only support CPU now.");
+      return (jlong)context;
       break;
     default:
       MS_LOGE("Invalid device_type : %d", device_type);
@@ -63,17 +61,12 @@ extern "C" JNIEXPORT jlong JNICALL Java_com_mindspore_lite_config_MSConfig_creat
 
   cpu_device_ctx.device_info_.cpu_device_info_.enable_float16_ = enable_float16;
 
-  if (device_type == mindspore::lite::DT_GPU) {
-    mindspore::lite::DeviceContext gpu_device_ctx{mindspore::lite::DT_GPU, {false}};
-    gpu_device_ctx.device_info_.gpu_device_info_.enable_float16_ = enable_float16;
-    context->device_list_.push_back(gpu_device_ctx);
-  }
   context->thread_num_ = thread_num;
   return (jlong)context;
 }
 
 extern "C" JNIEXPORT void JNICALL Java_com_mindspore_lite_config_MSConfig_free(JNIEnv *env, jobject thiz,
-                                                                                jlong context_ptr) {
+                                                                               jlong context_ptr) {
   auto *pointer = reinterpret_cast<void *>(context_ptr);
   if (pointer == nullptr) {
     MS_LOGE("Context pointer from java is nullptr");