FULL PRODUCT VERSION :
java version "1.7.0_04"

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
Before Java 7, you could pass NULL to the first parameter on the JNI DefineClass function, meaning the VM should figure out the name of the class by itself.

On Java 7, this causes the VM to crash, taking down the entire process and creates a minidump

REGRESSION.  Last worked in version 6u31

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
- Load the VM into a process using LoadLibrary
- Lookup the JNI_CreateJavaVM entry point
- Create the VM
- Call env->DefineClass with the first parameter being NULL
- BOOM!

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
- Same as Java 6: the class loads and the VM figures out the name by looking at the bytecode
ACTUAL -
BOOM! minidump

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
#define CLASS_FILE_NAME _T("blob.bytes")
#define JAVA_BINARY_CLASS_NAME "com/nanshusoft/defineclass/SimpleClass"


HANDLE class_file = CreateFile ( CLASS_FILE_NAME, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL );
	if ( class_file == INVALID_HANDLE_VALUE )
	{
		exit ( GetLastError() );
	}
	
	LARGE_INTEGER lpFileSize;
	if ( !GetFileSizeEx ( class_file, &lpFileSize ) )
	{
		exit ( GetLastError() );
	}

	LPBYTE buffer = (LPBYTE)malloc( lpFileSize.LowPart );
	ZeroMemory ( buffer, lpFileSize.LowPart );
	DWORD bytesRead = 0;
	if ( !ReadFile ( class_file, buffer, lpFileSize.LowPart, &bytesRead, NULL ) )
	{
		exit ( GetLastError() );
	}
	CloseHandle ( class_file );
	jclass classObj = NULL;

	if ( safe_method )
	{
		/* This works in both Java 6 and Java 7 */
		classObj = env->DefineClass ( JAVA_BINARY_CLASS_NAME, NULL , (const jbyte*)buffer, bytesRead );
	}
	else
	{
		/* This works in Java 6 and crashes the VM in Java 7 */
		classObj = env->DefineClass ( NULL, NULL , (const jbyte*)buffer, bytesRead );
	}

	free ( buffer );
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Pass the name of the class in the first parameter.

The big problem is that it breaks existing applications by crashing them instead of returning a Java exception.  Any function callable by the user should at least check the parameters before acting on them.

If Java 7 is no longer supporting a NULL first parameter (from Java code, it still works) in DefineClass, please update the documentation AND do a NULL check in the native code and throw a Java exception