Java Cannot Load 32-bit Swt Libraries On 64-bit Jvm
Tilo Chopin
My computer is win7 64 bit, and jdk is 1.7.0.21,jvm is 1.6.. and 64 bit I want to run SWT application and export as runnable jar file. When I run the application, it has the exception that Cannot load 32-bit SWT libraries on 64-bit JVM, so I import the SDK as alternate jre just like you point at Cannot load 64-bit SWT libraries on 32-bit JVM ( replacing SWT file ), and in Eclipse, the application can run correctly, but when I edit the bat file to run the jar file, it always has the problem like Cannot load 32-bit SWT libraries on 64-bit JVM, I have the swt.jar for 64 bit, but I don't konw how to replace and I wanna edit the bat file with the information with the SDK. How to handle the problem?
I am currently developing on a 64-bit Windows 7 machine. I have JRE7 64-bit and JRE7 32-bit installed on my machine. I am using Eclipse 64-bit version and configured Window - Preferences - Java - Installed JREs to use JRE7 32-bit to be my default JRE to test against. Also installed the 32-bit JDK and currently using that to test against.
The error clearly indicates that Eclipse is indeed using JDK7-32 Bit but for some reason the SWT Libraries ( =/eclipse/downloads/drops4/R-4.3-201306052000/swt-4.3-win32-win32-x86.zip) is not fully 32-bit o.O...
SWT uses plugin fragments to control this - there is a 32-bit fragment and a 64-bit fragment (as well as fragments for Mac, Linux, etc). Make sure your launch configuration is set to use the proper fragment depending on which JVM you're running it on.
Another idea would be to dive into the loadLibrary function - from what I remember of how that works, it looks for a cached version of the SWT dll from a temp location somewhere, and so it might be using a cached 64-bit dll instead of properly unpacking the 32-bit one from the jar. In that case, deleting the cached one may fix the issue.
The easiest solution, though, may be just to have two separate instances of Eclipse: one setup to run 32-bit, one setup to run 64-bit. This way you don't have to worry about toggling back and forth, or futz around with configurations as much.
Referring to -libraries-on-64-bit-JVM-td91066.htmlYou should either download SWT 64 bit, or run JVM with -d32 option. If you are on a mac, with java 7 or 8, you might get an error message: "This Java instance does not support a 32-bit JVM". Of course nothing restricts you from using an old java version:
we are running IDM 8.0 with latest SPs. Now, trying to connect an ABAP system runs into connection error "Parameter message server host ('jco.client.mshost') is missing" although all parameters are correctly set. So after some investigation and checking some SAP notes I tried to check the installed JCo version (system was installed & updated using SWPM/SUM). The console showed Java VM version and JCo3 API. But library could not be found. Instead there was an error "Can't load AMD 64-bit .dll on a IA 32-bit platform".
Ok... so, following note 2313331 I replaced the JCo3 files with the 32 bit version, re-started everything and checked again the JCo console. Now, it's fine - no errors, library was loaded, initialization successfully.
Great, I thought, problem solved, I thought... Nope.. the connection test to ABAP repository still failed. I increased the trace level and checked the DSE.log file. Now, here comes the funny part... it says "Can't load IA 32-bit .dll on a AMD 64-bit platform" (>_
In general, native libraries loaded by a Java VM must match the JVM's own word size, i.e. a 64 bit JVM will only ever load 64 bit native libraries successfully. Assuming you're using SAPJVM 8 for SAP IDM 8.0, it seems unlikely that the 32 bit version of the JCO DLL is the correct one, because -at least on the public download location at - SAPJVM 8 is only available for x64. Hence, my guess is that this can only work with 64bit JCO.
To be sure I am doing it right from my side I extracted an 64 bit .apk file from the .aab package to be sure I am installing the same build as in the Play Store and the app loaded the SSL libraries without any issues, it fails only when downloaded from the Store.
If you are talking about the post "Loading OpenSSL dynamic libraries arm & x86 (FMX, C++)", it is not related with my case at all. I am aware how to deploy the SSL and all other type of librarties. The problem occurs when the app is published to the Play Store. In all other cases my app runs as it should be, except when downloaded from the Play Store.
Then why the only moment ssl libraries are not loaded, is when the app is installed from the Play Store?! In all other cases it works?! I've tested on many phones, including mine, which now throws the same error, when I install the app from the Play Store. And I've also found on StackOverflow a similar issue as mine, which was solved by deploying "newer version of openssl libraries":
-fmx-indy-ssl-works-on-debugging-but-not-from-playstore-download
I got my ssl libraries from a member of the forum and I didn't know about the Indy's Github repo with 1.0.2u for latest version. I will try to find the Android binaries for 1.0.2u and let you know if there is any difference ! I hope this fixes my problem.
Meanwhile if you manage to find them, please send me a download link.
On 64-bit Windows, a 64-bit process cannot load a 32-bit dynamic-link library (DLL). Additionally, a 32-bit process cannot load a 64-bit DLL. However, 64-bit Windows supports remote procedure calls (RPC) between 64-bit and 32-bit processes (both on the same computer and across computers). On 64-bit Windows, an out-of-process 32-bit COM server can communicate with a 64-bit client, and an out-of-process 64-bit COM server can communicate with a 32-bit client. Therefore, if you have a 32-bit DLL that is not COM-aware, you can wrap it in an out-of-process COM server and use COM to marshal calls to and from a 64-bit process.
In-process servers are currently registered using the InprocServer registry entry. On 64-bit Windows, 64- and 32-bit in-process servers should use the InprocServer32 entry.
To port handles, which by their nature are local to the computer and would never be used across the 32-bit to 64-bit boundary, use the HANDLE_PTR type instead of the INT_PTR or DWORD_PTR type. This includes porting RPC interfaces passing such handles as DWORD values. The 64-bit HANDLE_PTR is 64 bits on the wire (not truncated) and thus does not need mapping. (The 32-bit HANDLE_PTR is 32 bits on the wire.)
You need to maintain an Eclipse RCP application that makes use of 32-bit Windows native libraries. Since you got a brand new laptop or PC that runs a 64-bit Windows, you install the 64-bit version of Eclipse. As you are aware that you need to execute the application in a 32-bit JVM, you add a 32-bit JDK via Window -> Preferences -> Java -> Installed JREs and configure that JDK as the default for the JavaSE-1.8 Execution Environment.
The reason for this is clear, you installed a 64-bit Eclipse, therefore you only have the 64-bit bundle fragment of SWT in your installation. But you need the 32-bit SWT fragment. This can be solved easily by configuring the target platform appropriately.
So I'm trying to get hello_xr to run in Android Studio but it keeps failing and giving me this big error. I can't figure out why I'm getting the error. It shows that java.lang.UnsatisfiedLinkError: Unable to load native library "/data/app/com.khronos.openxr.hello_xr.opengles-tIYUBycymObNaVjujvzClw==/base.apk!/lib/arm64-v8a/libhello_xr.so": dlopen failed: library "libopenxr_loader.so" not found, but I can't find the directory that the error is referring to.
32-bit JVMs are still used on Windows due to integration with 32-bit native libraries (DLLs). Their users cannot migrate directly to 64-bit JVMs because a 64-bit process on Windows cannot load 32-bit DLLs. While Windows x64 is capable of running 32-bit applications by emulating an 32-bit environment through WOW64, applications will suffer dramatic performance degradation despite the assumed memory footprint benefits.
Users can continue to run existing builds of the Windows 32-bit JVM to integrate with native 32-bit libraries and, if necessary, expose 32-bit functionality via remote APIs to be consumed by applications running on a 64-bit JVM within the same environment; and
Mac users: Macs do not have Java installed by default, so you will need to download and install Java. (You do not have to have Excel installed in order to read and write to Excel files in R.) Your version of Java must match the "bitness" (32-bit or 64-bit) as your version of R.
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