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  1. Undertow
  2. UNDERTOW-2163

Predicate Language cannot set attribute to empty string

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      The following predicate handler, 

      set( attribute=%{i,X-Tomcat-DocRoot}, value='' )

      produces a nasty parsing exception 

      java.lang.StringIndexOutOfBoundsException: index -1,length 0
        at java.base/java.lang.String.checkIndex(Unknown Source)
        at java.base/java.lang.AbstractStringBuilder.charAt(Unknown Source)
        at java.base/java.lang.StringBuilder.charAt(Unknown Source)
        at io.undertow.server.handlers.builder.PredicatedHandlersParser.tokenize(PredicatedHandlersParser.java:617)
        at io.undertow.server.handlers.builder.PredicatedHandlersParser.parse(PredicatedHandlersParser.java:84)

      It doesn't seem that the parser was designed to handle the simple scenario of empty quotes!  

      Leaving off the `value` parameter from the handler parses OK,

      set( attribute=%{i,X-Tomcat-DocRoot} )

      but throws an NPE when the handler actually runs:

      java.lang.NullPointerException: null
        at io.undertow.server.handlers.SetAttributeHandler.handleRequest(SetAttributeHandler.java:117)
        at io.undertow.predicate.PredicatesHandler.handleRequest(PredicatesHandler.java:113)

      The expected behavior for both of these examples would be to initialize the attribute (an HTTP request header in this case) to an empty value.

       

            rhn-support-rmartinc Ricardo Martin Camarero
            bdw429s Brad Wood (Inactive)
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              Created:
              Updated:
              Resolved: