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https://issues.apache.org/jira/browse/APEXCORE-767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16189333#comment-16189333
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ASF GitHub Bot commented on APEXCORE-767:
-----------------------------------------
florianschmidt1994 opened a new pull request #563: APEXCORE-767.set parent
classloader in StramAppLauncher.loadDependencies
URL: https://github.com/apache/apex-core/pull/563
Following below is my understanding of the problem (should be probably taken
with a grain of salt, as I just started digging in to the apex-core codebase):
StramAppLauncher.loadDependencies is called multiple times when starting
an application via the apex-cli with the -local option. In each of the
calls to loadDependencies, the contextClassLoader of the current thread
would be replaced with a new instance of URLClassLoader (which has no
parent class loader set).
This can lead to issues, e.g. when one acquires the current
contextClassLauncher, loads a class with it and tries to cast it to a
class which was loaded with a previous instance of the contextClassLoader,
resulting in a ClassCastException.
An example of this bug can be seen in APEXMALHAR-2511
The changes in this pr fix this by passing the parent class loader
for each new instance of URLClassLoader to the current
contextClassLoader
I am still in the process of figuring how the StramAppLauncher works and why
the dependencies get loaded multiple times in the first place, is this intended
behavior? Otherwise I could also look into what is going on there as well. (See
discussion on JIRA)
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> Duplicate class loading in CLI for single application launch
> -------------------------------------------------------------
>
> Key: APEXCORE-767
> URL: https://issues.apache.org/jira/browse/APEXCORE-767
> Project: Apache Apex Core
> Issue Type: Bug
> Reporter: Thomas Weise
> Assignee: Florian Schmidt
>
> StramAppLauncher will create multiple class loaders in a way that leads to
> duplicate loading of the same class (while listing app package, then when
> launching). It also appears that the context class loader is never reset.
>
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