为什么这个简单的JNI对象构造导致VM中止和SIGSEGV?

时间:2012-09-03 18:09:24

标签: android android-ndk java-native-interface

类别:

package com.example.foo;

public class Dummy
{
    int value;

    public Dummy(int value)
    {
        this.value = value;
    }   
}

JNI片段:

jclass class = (*jni_env)->FindClass(jni_env, "com/example/foo/Dummy");
jmethodID constructor = (*jni_env)->GetMethodID(jni_env, class, "<init>", "(I)V");
jobject object = (*jni_env)->NewObject(jni_env, constructor, 0);

LogCat输出:

09-03 11:02:02.937: W/dalvikvm(2179): Invalid indirect reference 0x44e9cf80 in decodeIndirectRef
09-03 11:02:02.937: E/dalvikvm(2179): VM aborting
09-03 11:02:02.937: A/libc(2179): Fatal signal 11 (SIGSEGV) at 0xdeadd00d (code=1), thread 2179

1 个答案:

答案 0 :(得分:2)

NewObject()期望类对象指针作为第二个参数。构造方法ID是第三个参数。像这样重新制定:

jobject object = (*jni_env)->NewObject(jni_env, class, constructor, 17); 

其中17是构造函数的参数。