liangrongjie commented on issue #1133: IllegalArgumentException at ConfigurationSpringInitializer#getProperties URL: https://github.com/apache/servicecomb-java-chassis/issues/1133#issuecomment-474232967 explanation above issue： There are some placeholders that cannot be replaced during the startup phase.（eg：`jdbc:postgresql://${ip}:${port}/pt`, database endpoint can only be obtained from the service center after service registration） `ConfigurationSpringInitializer#setEnvironment(Environment)` will be invoked automatic (for `implements EnvironmentAware`) after bean created&Initialized，then call stack is as follows： ```java ConfigurationSpringInitializer#setEnvironment(...) ConfigurationSpringInitializer#getAllProperties(...) ConfigurationSpringInitializer#getProperties(...) AbstractEnvironment#getProperty(...) ...... ``` at `AbstractPropertyResolver#resolveNestedPlaceholders` used `AbstractEnvironment#propertyResolver`(not ConfigurationSpringInitializer ) to resolve placeholder; although `ConfigurationSpringInitializer extends PropertyPlaceholderConfigurer` & `ignoreUnresolvablePlaceholders=true` and can be used to replace placeholders and not throw exceptions
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