Name: pa48320 Date: 03/14/2002

We embed the VM in a C++ program. If we load using the classic\jvm.dll and load sun.awt.windows.WToolkit.class, the VM crashes with the message:
FATAL ERROR in native method: Leaving arrays locked on native method return
at java.lang.Class.newInstance0(Native Method)
at java.lang.Class.newInstance(Class.java:237)
at sun.io.Converters.newConverter(Converters.java:120)
at sun.io.Converters.newDefaultConverter(Converters.java:215)
at sun.io.ByteToCharConverter.getDefault(ByteToCharConverter.java:55)
at java.lang.String.<init>(String.java:460)
at sun.awt.font.NativeFontWrapper.registerFonts(Native Method)
at sun.java2d.SunGraphicsEnvironment.registerFontFile(SunGraphicsEnvironment.java:492)
at sun.java2d.SunGraphicsEnvironment.initTerminalNames(SunGraphicsEnvironment.java:761)
at sun.java2d.SunGraphicsEnvironment.initCompositeFonts(SunGraphicsEnvironment.java:623)
at sun.java2d.SunGraphicsEnvironment$1.run(SunGraphicsEnvironment.java:95)
at java.security.AccessController.doPrivileged(Native Method)
at sun.java2d.SunGraphicsEnvironment.<init>(SunGraphicsEnvironment.java:75)
at sun.awt.Win32GraphicsEnvironment.<init>(Win32GraphicsEnvironment.java:38)
at java.lang.Class.newInstance0(Native Method)
at java.lang.Class.newInstance(Class.java:237)
at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:58)
at sun.awt.windows.WToolkit.resetGC(WToolkit.java:87)
at sun.awt.windows.WToolkit.<clinit>(WToolkit.java:77)

This does not happen if we load the hotspot VM.

The following MFC code shows the problem: call it with -loc <1.3.1 location> -classic
// testFontVM.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "jni.h"

void JNICALL ExitVM( jint code )
{
//if (fileHandle != INVALID_HANDLE_VALUE)
// CloseHandle(fileHandle);

// if (pLogFile) delete pLogFile;

//fileHandle = NULL;
//pLogFile = NULL;

_exit(code);
}

void JNICALL AbortVM()
{
// if (fileHandle != INVALID_HANDLE_VALUE)
// CloseHandle(fileHandle);

// if (pLogFile) delete pLogFile;

// fileHandle = NULL;
// pLogFile = NULL;

_exit(0);
}

jint JNICALL PrintVM( FILE* fp, const char* format, va_list args)
{
// char buf[1024];
// int i = vsprintf(buf, format, args);
// CString error = buf;
// fprintf(stderr, buf);
// if ((i > 1) && (buf[0] == ' ') && (buf[1] == NULL))
// {
// TRACE1("%s\n", buf);
// }
// else
// {
// TRACE1("%s", buf);
// }
// return i;
return 0;
}

int main(int argc, char* argv[])
{
// get JRE location
CString jreLocation = "c:\\jdk1.3.1_01\\jre\\bin";
CString jreType = "hotspot";
JavaVMInitArgs VMArgs;
JavaVMOption* properties = NULL;
CStringArray options;
BOOL locSet = false;

VMArgs.version = JNI_VERSION_1_2;
VMArgs.nOptions = 0;
VMArgs.options = NULL;

if (argc > 0)
{
int i;
for(i=0;i<argc;++i)
{
CString arg = argv[i];
if (arg.Compare("-loc") == 0)
{
locSet = true;
jreLocation = argv[++i];
}
else if (arg.Compare("-classic") == 0)
jreType = "classic";
else if ((arg[0] == '-') && (arg[1] == 'D'))
options.Add(arg);
else if ((arg[0] == '-') && (arg[1] == 'X'))
options.Add(arg);
}
}

if (!locSet)
{
HKEY key;
DWORD dwType;
BOOL goodValue = FALSE;
if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, "Software\\Javasoft\\Java Runtime Environment\\1.3",
0, KEY_READ, &key) == ERROR_SUCCESS)
{
ULONG len;
LONG lResult = RegQueryValueEx(key, "RuntimeLib", NULL, &dwType, NULL, &len);
if (lResult == ERROR_SUCCESS)
{
lResult = RegQueryValueEx(key, "RuntimeLib", NULL, &dwType,
(LPBYTE)jreLocation.GetBuffer(len/sizeof(TCHAR)), &len);
jreLocation.ReleaseBuffer();
goodValue = TRUE;
}
RegCloseKey(key);
}
}
else
{
jreLocation +="\\"+jreType+"\\jvm.dll";
}


properties = new JavaVMOption[options.GetSize()+3];
VMArgs.nOptions = options.GetSize()+3;
VMArgs.options = properties;
int i;
for(i=0;i<options.GetSize();++i)
{
CString arg = options.GetAt(i);
properties[i].optionString = new TCHAR[arg.GetLength()+1];
strcpy(properties[i].optionString, arg.GetBuffer(1));
//properties[i].optionString = args.GetAt(i).GetBuffer(1);
}
properties[i].optionString = "vfprintf";
properties[i].extraInfo = PrintVM;
++i;
properties[i].optionString = "exit";
properties[i].extraInfo = ExitVM;
++i;
properties[i].optionString = "abort";
properties[i].extraInfo = AbortVM;

JNIEnv* ee;
JavaVM* vm;
// load jvm.dll
HINSTANCE javai = NULL;
javai = LoadLibraryEx(jreLocation, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);


// CreateJavaVM
typedef jint (JNICALL *cjVM)(JavaVM**, JNIEnv **, void *);
cjVM JNI_cjVM = (cjVM)GetProcAddress(javai, "JNI_CreateJavaVM");
jint retCode = (*JNI_cjVM)(&vm, &ee, (void*)&VMArgs);

/******************************************************************************************
* put test code here
******************************************************************************************/
jclass jClass = ee->FindClass("sun/awt/windows/WToolkit");


/*
     * Detach the current thread so that it appears to have exited when
     * the application's main method exits.
     */
    if ((vm)->DetachCurrentThread() != 0)
{
fprintf(stderr, "Could not detach main thread.\n");
    }
    (vm)->DestroyJavaVM();

if (properties)
{
for(i=0;i<options.GetSize();++i)
{
delete properties[i].optionString;
}
delete properties;
}
return 0;
}

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Name: pa48320 Date: 03/14/2002

(company - SAS Institute , email - ###@###.###)

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###@###.### 2004-01-15