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Steps to Reproduce:
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The following code produces the exception

System.out.println(UriBuilder.fromPath("/{p}").build("$a"));

Exception in thread "main" java.lang.IllegalArgumentException: Illegal group reference
at java.util.regex.Matcher.appendReplacement(Matcher.java:713)
at org.jboss.resteasy.specimpl.UriBuilderImpl.replaceParameter(UriBuilderImpl.java:463)
at org.jboss.resteasy.specimpl.UriBuilderImpl.buildFromMap(UriBuilderImpl.java:383)
at org.jboss.resteasy.specimpl.UriBuilderImpl.buildFromValues(UriBuilderImpl.java:558)
at org.jboss.resteasy.specimpl.UriBuilderImpl.build(UriBuilderImpl.java:539)
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The following code produces the exception System .out.println(UriBuilder.fromPath( "/{p}" ).build( "$a" )); Exception in thread "main" java.lang.IllegalArgumentException: Illegal group reference at java.util.regex.Matcher.appendReplacement(Matcher.java:713) at org.jboss.resteasy.specimpl.UriBuilderImpl.replaceParameter(UriBuilderImpl.java:463) at org.jboss.resteasy.specimpl.UriBuilderImpl.buildFromMap(UriBuilderImpl.java:383) at org.jboss.resteasy.specimpl.UriBuilderImpl.buildFromValues(UriBuilderImpl.java:558) at org.jboss.resteasy.specimpl.UriBuilderImpl.build(UriBuilderImpl.java:539)

Method UriBuilder.build throws an IllegalArgumentException when a value for a template parameter in the URI path contains a dollar mark:

UriBuilder.fromPath("/{p}").build("$a");

The reason is that UriBuilderImpl.java does not apply proper quoting on line 463

matcher.appendReplacement(buffer, value);

which can be fixed like this

matcher.appendReplacement(buffer, Matcher.quoteReplacement(value));