Calling jar inside dll methods

Hello,
Can anyone give me a brief explanation on how to use the methods of a dll (made on c++) from java?
I would like to put the dll inside the jar/cab file along with the java classes.
best regards
Jonathan

Thank you, I checked the links which are were very instructional.
But I have one question remaining: How can I make reference to a dll inside my jar/cab file?
the line System.loadLibrary("xxx") load just dlls from the local machine?
best regards
Jonathan

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Dear experts,
I hope this is the right place to post such question. I have a web and desktop app developed using netbeans and to be built into a JAR(J) and WAR (W) file. I would like to know if it is possible for the (J) to call some other JAR (or .class) inside the (W)? Our ultimate goal is to share common classes between two apps, and hopefully no need to re-build the (J) when (W) is modified, or vice-versa. I hope my explaination is clear enough. Any comments and sugguestions is welcomed and appreciated, thanks.

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I have only a small question.
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venture

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Pardon me if you find my question silly, but I am relatively
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Or
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Garbage collection of objects created inside a method

I have method and inside the method I create new Objects I mean I instantiate objects using new and call some methods on these objects.
once the method execution is completed and control goes to caller of the method will all the object created inside the method will be garbage collected ?
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user11138293 wrote:
I have method and inside the method I create new Objects I mean I instantiate objects using new and call some methods on these objects.
once the method execution is completed and control goes to caller of the method will all the object created inside the method will be garbage collected ?If there are no reachable references, to those objects, then when the method ends, they become eligible for GC. If and when they are actually collected is something we can't know or control, and generally don't care about. The only guarantee is that everything that can be collected will be collected before an OutOfMemoryError is thrown. So from our perspective, once it's eligible for collection, it is effectively collected.
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Hi everyone,
I'm having issues creating a Java app to call an existing c++ DLL. I've done extensive searching for a solution and found lots of goodies, but nothing to fix my problem yet.
I've gone through the JNI tutorial and created my java class, used javah, and created my native code according to the tutorial.
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the DLL I'm trying to call makes a call to a device on the USB port. I also have the source code and header files for the DLL but thought it would be easier to just have to deal with the already built DLL.
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http://goff.nu/techarticles/development/cpp/calldll.html
JNIEXPORT void JNICALL
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MyFunction = FUNC(myDLLFunction);
printf("Calling function\n");
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MyFunction(PIXEL256);
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FreeLibrary(ocpmSerialDLL);
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An unexpected exception has been detected in native code outside the VM.
Unexpected Signal : EXCEPTION_ACCESS_VIOLATION (0xc0000005) occurred at PC=0x182
91E6B
Function=[Unknown.]
Library=C:\sun\MyJava\ocpm\src\OCPMSerialDLL.dll
NOTE: We are unable to locate the function name symbol for the error
just occurred. Please refer to release documentation for possible
reason and solutions.
Current Java thread:
at OCPMControl.OCPMSetPixelCount(Native Method)
at OCPMControl.getData(OCPMControl.java:167)
at OCPMService.main(OCPMService.java:46)
Dynamic libraries:
0x00400000 - 0x00406000 c:\sun\j2sdk1.4.2_03\bin\java.exe
0x77F80000 - 0x77FFD000 C:\WINNT\system32\ntdll.dll
0x7C2D0000 - 0x7C332000 C:\WINNT\system32\ADVAPI32.dll
0x7C570000 - 0x7C628000 C:\WINNT\system32\KERNEL32.DLL
0x77D30000 - 0x77DA1000 C:\WINNT\system32\RPCRT4.DLL
0x78000000 - 0x78045000 C:\WINNT\system32\MSVCRT.dll
0x08000000 - 0x08138000 c:\sun\j2sdk1.4.2_03\jre\bin\client\jvm.dll
0x77E10000 - 0x77E75000 C:\WINNT\system32\USER32.dll
0x77F40000 - 0x77F7E000 C:\WINNT\system32\GDI32.DLL
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0x10000000 - 0x10007000 c:\sun\j2sdk1.4.2_03\jre\bin\hpi.dll
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0x007F0000 - 0x007FD000 c:\sun\j2sdk1.4.2_03\jre\bin\zip.dll
0x18270000 - 0x1827E000 C:\sun\MyJava\ocpm\src\OCPMNative.dll
0x18290000 - 0x182AA000 C:\sun\MyJava\ocpm\src\OCPMSerialDLL.dll
0x68120000 - 0x681A1000 C:\sun\MyJava\ocpm\src\instrsup.dll
0x76B30000 - 0x76B6E000 C:\WINNT\system32\comdlg32.dll
0x70A70000 - 0x70AD5000 C:\WINNT\system32\SHLWAPI.DLL
0x71710000 - 0x71794000 C:\WINNT\system32\COMCTL32.DLL
0x782F0000 - 0x78538000 C:\WINNT\system32\SHELL32.DLL
0x77920000 - 0x77943000 C:\WINNT\system32\imagehlp.dll
0x72A00000 - 0x72A2D000 C:\WINNT\system32\DBGHELP.dll
0x690A0000 - 0x690AB000 C:\WINNT\system32\PSAPI.DLL
Heap at VM Abort:
Heap
def new generation total 576K, used 140K [0x10010000, 0x100b0000, 0x104f0000)
eden space 512K, 27% used [0x10010000, 0x10033368, 0x10090000)
from space 64K, 0% used [0x10090000, 0x10090000, 0x100a0000)
to space 64K, 0% used [0x100a0000, 0x100a0000, 0x100b0000)
tenured generation total 1408K, used 0K [0x104f0000, 0x10650000, 0x14010000)
the space 1408K, 0% used [0x104f0000, 0x104f0000, 0x104f0200, 0x10650000)
compacting perm gen total 4096K, used 1012K [0x14010000, 0x14410000, 0x1801000
0)
the space 4096K, 24% used [0x14010000, 0x1410d1f0, 0x1410d200, 0x14410000)
Local Time = Wed May 12 10:53:56 2004
Elapsed Time = 10
# The exception above was detected in native code outside the VM
# Java VM: Java HotSpot(TM) Client VM (1.4.2_03-b02 mixed mode)
# An error report file has been saved as hs_err_pid2120.log.
# Please refer to the file for further information.
Is there something else I have to do to tell the JVM that the external DLL call isn't an Access Violation?
Would it be easier to use the source files instead?
Thanks to anyone who can help me out here!
Scott Campbell

Thanks,
The problem has been solved. I wasn't linking the dll properly to access the external DLL and thus, my native DLL was looking for methods that it didn't know how to find. which was easily solved by adding a few options when creating my native dll.
Here is the link I found to solve the problem incase anyone else has issues like this. It is regarding implicit v.s. explicit linking to external DLLs in using visual C++.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore/html/_core_link_an_executable_to_a_dll.asp
Scott.

Calling a c++ dll that contains a dialog.

Hi,
I have a c++ dll that contains a dialog. When I try to display the dialog (ShowDialog(SW_SHOW);) the dialog is popped up but the dialog window is frozen and do not display its controls. The Java application is call an intermediate dll create by JNI that is calling the c++ dll.
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It should be discernable (by looking at the C# code) whether the C DLL needs to be registered.
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regsvr32 <your_DLL_File_path>
If it's supplying .NET assemblies, I think it needs to be registered with
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Luck/Cheers!
Message Edited by tbd on 12-03-2008 02:36 AM
"Inside every large program is a small program struggling to get out." (attributed to Tony Hoare)

Calling jar inside dll methods

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