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Add a note about classloader issues to README #597

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Nov 4, 2018
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Add a note about classloader issues to README #597

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Add a note about classloader issues to README
kubukoz Nov 4, 2018
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Update README.md
havocp Nov 4, 2018
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kubukoz Nov 4, 2018
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9 changes: 9 additions & 0 deletions README.md
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Expand Up @@ -759,6 +759,15 @@ If you have trouble with your configuration, some useful tips.
string with comments showing where each value came from.
This string can be printed out on console or logged to
a file etc.
- If you see errors like
`com.typesafe.config.ConfigException$Missing: No configuration setting found for key foo`,
and you're sure that key is defined in your config file, they might appear e.g.
when you're loading configuration from a thread that's not the JVM's main thread.
Try passing the `ClassLoader` in manually - e.g. with `ConfigFactory.load(getClass().getClassLoader())`
or setting the context class loader.
If you don't pass one, Lightbend Config uses the calling thread's `contextClassLoader`, and in some cases,
it may not have your configuration files in its classpath,
so loading the config on that thread can yield unexpected, erroneous results.

### Supports Java 8 and Later

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