JVM外的JNI崩溃 - EXCEPTION_ACCESS_VIOLATION

我需要一个Java应用程序来操纵Windows注册表。为此，我编写了一些本地C++代码并使用JNI来调用它。JVM外的JNI崩溃 - EXCEPTION_ACCESS_VIOLATION

它的大部分工作。在测试过程中，我没有听说过任何一个问题。但是，最近用户在C++代码中遇到了导致JVM失败的崩溃。细节如下。我几乎没有C++经验，所以我认为这是我需要帮助的地方。我认为这个问题与权限有关，因为当Java应用程序以管理员身份运行时，问题就会消失。问题在于并非所有的用户都会在他们的机器上拥有管理员权限。

hs_err_pid日志信息：

# 
# A fatal error has been detected by the Java Runtime Environment: 
# 
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x0000000076859083, pid=5316, tid=3116 
# 
# JRE version: 6.0_20-b02 
# Java VM: Java HotSpot(TM) 64-Bit Server VM (16.3-b01 mixed mode windows-amd64) 
# Problematic frame: 
# C [kernel32.dll+0x9083] 
# 
# If you would like to submit a bug report, please visit: 
# http://java.sun.com/webapps/bugreport/crash.jsp 
# The crash happened outside the Java Virtual Machine in native code. 
# See problematic frame for where to report the bug. 
# 

Stack: [0x0000000013010000,0x0000000013110000], sp=0x000000001310f2d0, free space=3fc0000000000000000k 
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code) 
C [kernel32.dll+0x9083] 

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code) 
j my.package.WinRegUtils.SetKeyValue(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)Z+0 
j java.lang.Thread.run()V+11 
v ~StubRoutines::call_stub

这里是问题

JNIEXPORT jboolean JNICALL Java_my_package_WinRegUtils_SetKeyValue 
    (JNIEnv* env, jclass clazz, jstring jRootKey, jstring jKey, jstring jValueName, jstring jValueData, jstring jDataType) 
{ 
    bool success = false; 

    WCHAR* key_w; 
    WCHAR* valueName_w; 
    WCHAR* valueData_w; 
    WCHAR* dataType_w; 
    HKEY hKey; 

    const char* rootKey = env->GetStringUTFChars(jRootKey, false); 
    const char* key = env->GetStringUTFChars(jKey, false); 
    convertString(key, &key_w); 
    const char* valueName = env->GetStringUTFChars(jValueName, false); 
    convertString(valueName, &valueName_w); 
    const char* valueData = env->GetStringUTFChars(jValueData, false); 
    convertString(valueData, &valueData_w); 
    const char* dataType = env->GetStringUTFChars(jDataType, false); 
    convertString(dataType, &dataType_w); 

    HKEY root = GetRootHKEY(rootKey); 
    if (RegOpenKeyEx(root, key_w, 0, KEY_WRITE, &hKey) == ERROR_SUCCESS) 
    { 
     DWORD dwType; 
     BYTE* data; 
     DWORD length; 
     if (strcmp("REG_SZ", dataType) == 0) 
     { 
      dwType = REG_SZ; 
      data = (BYTE*)valueData_w; 
      length = wcslen(valueData_w) * sizeof(DWORD); 
     } 
     else if (strcmp("REG_DWORD", dataType) == 0) 
     { 
      dwType = REG_DWORD; 
      const DWORD intData = atoi(valueData); 
      data = (BYTE*)&intData; 
      length = sizeof(DWORD); 
     } 

     if (RegSetValueEx(hKey, valueName_w, 0, dwType, data, length) == ERROR_SUCCESS) 
     { 
      success = true; 
      RegCloseKey(hKey); 
     } 
    } 

    env->ReleaseStringUTFChars(jRootKey, rootKey); 
    env->ReleaseStringUTFChars(jKey, key); 
    env->ReleaseStringUTFChars(jValueName, valueName); 
    env->ReleaseStringUTFChars(jValueData, valueData); 
    env->ReleaseStringUTFChars(jDataType, dataType); 
    delete[] key_w, valueName_w, valueData_w, dataType_w; 

    return success; 
}

来源

2012-03-29 user1300560

调试本地代码/方法，添加一些

printf("debug xxx"); 
fflush(stdout);

在

Java_my_package_WinRegUtils_SetKeyValue()

来隔离故障线路。

来源

2012-04-01 19:15:52 Java42

JVM外的JNI崩溃 - EXCEPTION_ACCESS_VIOLATION

回答

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