Problems with Simple language
-----------------------------

                 Key: CAMEL-4988
                 URL: https://issues.apache.org/jira/browse/CAMEL-4988
             Project: Camel
          Issue Type: Bug
          Components: camel-core
    Affects Versions: 2.9.0
         Environment: Standalone application with Spring context and routes 
defined in XML.
            Reporter: Diego


If you don't use a simple expresion that falls back to the 
SimpleBackwardsCompatibleParser, the simple language doesn't seem to work. If I 
override the start and end token with an explicit definition of the 
simplelanguage everything works well.

  <bean id="simple" class="org.apache.camel.language.simple.SimpleLanguage">
      <constructor-arg name="functionStartToken" value="${"/>
      <constructor-arg name="functionEndToken" value="}"/>
  </bean> 

It seems that 
org.apache.camel.language.simple.SimpleExpressionParser.SimpleExpressionParser(String)
 fails to create an expression because startToken and endToken are 
"automagically" changed for strange Strings. It seems that when 
exchange.getContext().resolveLanguage("simple") tries to resolve the languaje 
it doesn't use the default construtor and injects a strange start and end token 
in the constructor SimpleLanguage(String functionStartToken, String 
functionEndToken).

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