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Thousands of exceptions during boot, yet application is running - harmless or should be addressed? [message #1744897]

Sat, 01 October 2016 23:18

Michal Siemaszko

Messages: 1
Registered: October 2016

Junior Member

Hi,

I'm working on upgrading a legacy application which uses Equinox as its OSGi runtime. When booted and running, there are close to a thousand bundles loaded in the container.

Since I'm working on upgrading significant parts of the application, and debugging issues still present during boot, I discovered thousands of exceptions present in the existing (trunk/production version, not the upgraded one) of the application after enabling osgi.debug.

Is seeing so many exceptions - e.g. ClassNotFound exceptions - during boot in an application which does boot however and runs, is normal? Or is it a symptom of issues which should be addressed and might come out when - e.g. now - parts of the application are being upgraded and many new bundles added and a critical point is reached where application simply will not start until underlying reason for this is solved?

Is Equinox OSGi well suited for running applications consisting of close to a thousand bundles? Are there any potential resource bottleneck related issues which should be considered in such large OSGI applications?

I will greatly appreciate your input, since I have not found much - or nothing at all - regarding issues which could cause such.

Regards,
Michal

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Re: Thousands of exceptions during boot, yet application is running - harmless or should be addresse [message #1744985 is a reply to message #1744897]

Mon, 03 October 2016 19:38

Thomas Watson

Messages: 503
Registered: July 2009

Senior Member

Can you give an example of one of the exceptions? It is not possible to determine the nature of the exceptions at this point. I know ResourceBundle loading may result in a large number of class load requests for NLS classes that likely don't exists. For example, if you translatable text is shipped in *.properties files. There may be similar cases like this as well.

You mention org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader class on equinox-dev mailing list. This particular class has not been used since the Kepler release which is over 3 years old. Have you considered updating to a more recent release?

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