Android：JNI ERROR（app bug）：本地引用表溢出（max = 512） [英] Android : JNI ERROR (app bug): local reference table overflow (max=512)

问题描述

我有一个Android应用程序有本机代码。本地代码需要从java代码中获取特定的值;这个值定期更新，所以我需要得到它，当我需要使用它。我使用JNI从本地代码调用到Java代码。

I have an android app which has native code. The native code needs to get a particular value from java code; this value updates regularly, so I need to get it when I need to use it. I am using JNI to make the call from native code to Java code.

std::string val;
JNIEnv* env = JSC::Bindings::getJNIEnv();
jclass bridgeClass = env->FindClass("com.mypackage.MyClass");
jmethodID method = env->GetStaticMethodID(bridgeClass, "getVal", "()Ljava/lang/String;");
val = jstringToStdString(env, static_cast<jstring>(env->CallStaticObjectMethod(bridgeClass, method)));
env->DeleteLocalRef(bridgeClass);

我经常打电话（几乎每分钟100次），我面临以下异常：

I make this call very often (almost 100 times a minute), and I am facing the following exception:

E/dalvikvm( 1063): JNI ERROR (app bug): local reference table overflow (max=512)
W/dalvikvm( 1063): JNI local reference table (0xcc8590) dump:
W/dalvikvm( 1063):   Last 10 entries (of 512):
W/dalvikvm( 1063):       511: 0x413c7e70 java.lang.String "ABC"
W/dalvikvm( 1063):       510: 0x40a39470 java.lang.Class<android.util.Log>
W/dalvikvm( 1063):       509: 0x413c8558 java.lang.String "9287391238192... (24 chars)
W/dalvikvm( 1063):       508: 0x413c8558 java.lang.String "8298731897198... (24 chars)
W/dalvikvm( 1063):       507: 0x413c8558 java.lang.String "1983918729387... (24 chars)
W/dalvikvm( 1063):       506: 0x413c8558 java.lang.String "9283719732827... (24 chars)
W/dalvikvm( 1063):       505: 0x413c8558 java.lang.String "1231219897173... (24 chars)
W/dalvikvm( 1063):       504: 0x413c8558 java.lang.String "8237330127537... (24 chars)
W/dalvikvm( 1063):       503: 0x413c8558 java.lang.String "1293657681298... (24 chars)
W/dalvikvm( 1063):       502: 0x413c8558 java.lang.String "1298753090172... (24 chars)
W/dalvikvm( 1063):   Summary:
W/dalvikvm( 1063):         2 of java.lang.Class (2 unique instances)
W/dalvikvm( 1063):       510 of java.lang.String (2 unique instances)
E/dalvikvm( 1063): Failed adding to JNI local ref table (has 512 entries)

在线所有类似问题都有一个共同的答案，释放。

All the similar questions online have the common answer that more resources need to be freed. Can anyone tell what other resources can I free in this case?

感谢。

推荐答案

您需要将本地引用删除为

You need to delete the local ref to the value returned by

env->CallStaticObjectMethod(bridgeClass, method).

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