[jira] Created: (VELOCITY-683) When passing literals other than strings to macro calls, setting new values the formal parameters does not propagate the changes outside the local scope

[Sergiu Dumitriu (JIRA)]

When passing literals other than strings to macro calls, setting new values the 
formal parameters does not propagate the changes outside the local scope
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                 Key: VELOCITY-683
                 URL: https://issues.apache.org/jira/browse/VELOCITY-683
             Project: Velocity
          Issue Type: Bug
          Components: Engine
    Affects Versions: 1.6.1, 1.6, 1.5
            Reporter: Sergiu Dumitriu
            Priority: Minor


With this macro definition:

#macro(setValueToEmpty $value)
  #set($value = '')
#end

While the following works well:

#set($value = 'abc')
#setValueToEmpty('abc') => $value == ''

this fails:

#set($value = 'abc')
#setValueToEmpty(3) => $value == 'abc'

This is caused by the fact that in 
org.apache.velocity.context.ProxyVMContext#addVMProxyArg if the parameter is a 
constant (which somehow doesn't include strings), then a local variable is 
created with the node's value as its value. For string literals, the actual 
node is placed in the proxy map, which allows setting a new value for it.

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