Re: ImageJ Compile&Run compiles java program in editor but runs from cache. How to fix?

Posted by Fred Damen on Sep 19, 2017; 8:20pm
URL: http://imagej.273.s1.nabble.com/ImageJ-Compile-Run-compiles-java-program-in-editor-but-runs-from-cache-How-to-fix-tp5019392p5019399.html

I read a little imagej code and came upon:
/** This version of the constructor is used when ImageJ is launched using Java
WebStart. */
public PluginClassLoader(String path, boolean callSuper) {
        super(new URL[0], Thread.currentThread().getContextClassLoader());
        init(path);
}

Which seems like it might be using a cache class loader if 'Java WebStart' is
turned on.  How do I tell if it is on and how can it be turned off?

Thanks,

Fred

On Tue, September 19, 2017 12:33 pm, Fred Damen wrote:

> Greetings Gabriel,
>
> There is only one copy of ImageJ.  The problem did not exist before I killed
> imagej while it was stuck. The problem existed after and no other changes have
> been made, except to the source code of the plugin in question.
>
> The plugin recompiles, timestamps of the class files and java files are when I
> hit Ctrl-R.  As tests, I inserted a syntax error into the source, hit Ctrl-R,
> and the error window pops up correctly identifying the syntax error; I erased
> the .class files while imagej is running and ran the plugin from the Plugins
> menu and the version that existed when imagej started was run; *without the
> .class files in the plugins directory*.  This leads me to believe that there
> is a cache somewhere; which I can not find.
>
> When I start imagej with the .class files in the plugins directory the .class
> files seem to get placed in some cache somewhere, once they are there they do
> not get updated.  Running the Help->Refresh Menus with the .class files cached
> the version that runs is not updated.  As a new test I tried, exiting imagej,
> erase .class files, start imagej; the plugin does not show up in the Plugins
> menu; then I update the plugin, i.e., change a string in a IJ.log, Ctrl-R,
> Help->Refresh Menus; the plugin now shows up in the Plugins menu and it runs
> the current version.  Make another update, Ctrl-R, and it runs the previous
> version.
>
> Fred
>
>
> On Tue, September 19, 2017 11:42 am, Gabriel Landini wrote:
>> On Tuesday, 19 September 2017 16:56:01 BST [hidden email] wrote:
>>> The whole point is that I should not have to restart imagej every time I
>>> need to recompile a Java plugin.  And up to the point that I needed to kill
>>> imagej I did not need to restart.  Help->Refresh Menus does not cause the
>>> newer version of the plugin to be used.
>>
>> So you mean that the program was modified AND compiled, but the code that
>> runs
>> is the old one?
>> I would check the date of the class file. Maybe the last time it did no
>> compile? Or maybe there is more than one installation of IJ (I have seen
>> that
>> several times, people copying plugins in the plugin folder but which never
>> appear in the menu... and then realise that there were 2 copies of IJ!
>>
>> Cheers
>>
>> Gabriel
>>
>> --
>> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>>
>
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> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>

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