Thanks, On Wed, Mar 18, 2015 at 4:32 PM, Johannes Schindelin < johannes.schinde...@gmx.de> wrote:
> Hi Lee, > > On 2015-03-18 14:47, Lee Kamentsky wrote: > > I'm programming "monkey see, monkey do" style. I have very little idea >> what >> I'm doing, trying to replicate the logic for mac loading dylibs in >> imagej-loader. >> >> I've gotten pretty far, but at the end, I'm seeing the error, >> "JavaNativeFoundation: GetGlobalVM: JNI_GetCreatedJavaVMs() failed to get >> any VM" when I start an AWT app. >> > > Do you expect a JVM to be running already? If not, you should [create one]( > https://github.com/imagej/imagej-launcher/blob/ > 3e061521a/src/main/c/ImageJ.c#L307-L322). > > I am guessing that this is why you dlopened libjli here >> <https://github.com/imagej/imagej-launcher/blob/master/ >> src/main/c/ImageJ.c#L264>. >> > > Heh, I have to admit that I did not remember at all why I did that. > Happily, even I learned to write kick-ass commit messages, and I also > learned the awesomeness of the `Blame` button on GitHub: > https://github.com/imagej/imagej-launcher/blame/master/ > src/main/c/ImageJ.c#L264 (I vaguely remember writing that commit message > after spending something between twenty and thirty super-focused hours on > hunting down this bug, that was not really fun, that one hunt). > > I do the same, but (so far) with Python's ctypes.CDLL. That doesn't let >> you >> specify RTLD_LAZY as a dlopen mode. So, I think that's the big difference >> between how you do things and how I do them. My first question is whether >> RTLD_LAZY is needed as the mode. My second question is why you needed to >> load libjli.dylib in the first place and, if you might grant me a third >> wish, my third question is whether you've seen this error before. >> > > The JLI library is only needed for forward compatibility, so that MacOSX > does not annoy the user by a "Do you want to install Java 6?" popup. > > And yes, I have seen an error like that before, but only when trying to > attach to a running JVM from within Matlab (Matlab's very own GUI is > written in Java... so there is already a JVM running in a Matlab instance > although it is a bit tricky to get at it under certain circumstances, but > it is impossible to run two Oracle JVMs in the same process in any case). > > Thanks in advance, Mr. Wizard. >> > > Sorry, oh ye mighty Python God, I fear my input was not really helpful to > your cause. But maybe you have a project for me to clone, with instructions > that might let this poor Python pilgrim reproduce the issue? > > Ciao, > Dscho >
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