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https://issues.apache.org/jira/browse/CAMEL-20763?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-20763.
---------------------------------
Resolution: Fixed
> Rest template with underscore fails after Camel 4.2.0
> -----------------------------------------------------
>
> Key: CAMEL-20763
> URL: https://issues.apache.org/jira/browse/CAMEL-20763
> Project: Camel
> Issue Type: Bug
> Components: camel-core
> Affects Versions: 4.2.0
> Environment: Camel 4.2.0 or later
> Reporter: Dave Riseley
> Priority: Minor
> Fix For: 4.4.3, 4.7.0
>
>
> We have a camel route, which in it's simplified form looks like this:
> {code:java}
> @Component
> public class CamelRouteBuilder extends RouteBuilder{
> @Override
> public void configure() throws Exception {
> restConfiguration().component("servlet");
> rest("/hello")
> .get("/{first_name}")
> .to("direct:helloworld");
> from("direct:helloworld")
> .transform()
> .simple("Hi ${header.first_name}");
> }
> }
> {code}
> This works fine on Spring Boot 3.1.11 / Camel 4.0.5 . When we upgrade to
> Camel 4.2.0 or later, it fails on startup with the following exception:
>
> {code:java}
> Caused by: java.util.regex.PatternSyntaxException: named capturing group is
> missing trailing '>' near index 17
> \/hello\/(?<first_name>[^\/]+)
> ^
> at java.base/java.util.regex.Pattern.error(Pattern.java:2028) ~[na:na]
> at java.base/java.util.regex.Pattern.groupname(Pattern.java:2945)
> ~[na:na]
> at java.base/java.util.regex.Pattern.group0(Pattern.java:2990)
> ~[na:na]
> at java.base/java.util.regex.Pattern.sequence(Pattern.java:2124)
> ~[na:na]
> at java.base/java.util.regex.Pattern.expr(Pattern.java:2069) ~[na:na]
> at java.base/java.util.regex.Pattern.compile(Pattern.java:1783)
> ~[na:na]
> at java.base/java.util.regex.Pattern.<init>(Pattern.java:1430)
> ~[na:na]
> at java.base/java.util.regex.Pattern.compile(Pattern.java:1069)
> ~[na:na]
> at
> org.apache.camel.support.RestConsumerContextPathMatcher.register(RestConsumerContextPathMatcher.java:255)
> ~[camel-support-4.2.0.jar:4.2.0]
> at
> org.apache.camel.http.common.CamelServlet.connect(CamelServlet.java:424)
> ~[camel-http-common-4.2.0.jar:4.2.0]
> at
> org.apache.camel.component.servlet.CamelHttpTransportServlet.connect(CamelHttpTransportServlet.java:100)
> ~[camel-servlet-4.2.0.jar:4.2.0]
> ....
> {code}
> I believe this is due to a change introduced by
> https://issues.apache.org/jira/browse/CAMEL-8306 in which the following
> method:
> {code:java}
> /**
> * Pre-compiled consumer path for wildcard match
> *
> * @param consumerPath a consumer path
> */
> public static void register(String consumerPath) {
> // Convert URI template to a regex pattern
> String regex = consumerPath
> .replace("/", "\\/")
> .replace("{", "(?<")
> .replace("}", ">[^\\/]+)");
> // Add support for wildcard * as path suffix
> regex = regex.replace("*", ".*");
> // Match the provided path against the regex pattern
> Pattern pattern = Pattern.compile(regex);
> PATH_PATTERN.put(consumerPath, pattern);
> }
> {code}
>
> does not allow for underscore (and other regex special characters) in the
> parameter name. I could not find any documentation that describes limits on
> the characters that can be used in rest templates.
> Our production code has many, many rest routes with many parameters with
> underscores in them.
> I will prepare a PR with a proposed fix
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