[jira] [Created] (CAMEL-20802) Velocity shows error when using ${headers}

[Raymond (Jira)]

Raymond created CAMEL-20802:
-------------------------------

             Summary: Velocity shows error when using ${headers}
                 Key: CAMEL-20802
                 URL: https://issues.apache.org/jira/browse/CAMEL-20802
             Project: Camel
          Issue Type: Bug
          Components: camel-velocity
    Affects Versions: 4.6.0
            Reporter: Raymond


In Camel 3 (3.20.8) I have the following route:


{code:java}
<route id="myRoute">
        <from uri="direct:in"/>
        <setHeader headerName="CamelVelocityTemplate">
            <simple>${headers}</simple>
        </setHeader>
        <to uri="velocity:generate"/>
        <to 
uri="log:foo//?skipBodyLineSeparator=false&amp;multiline=true&amp;showHeaders=false&amp;showBody=true&amp;showBodyType=true&amp;showFiles=true&amp;showException=false&amp;showStackTrace=false&amp;showCaughtException=false"/>
    </route>     {code}

Then I get an output like this:


{code:java}
{Accept=text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7,
 Accept-Encoding=gzip, deflate, br, zstd, 
Accept-Language=nl-NL,nl;q=0.9,en-US;q=0.8,en;q=0.7, 
breadcrumbId=7FE304808A5EF7B-0000000000008538, 
CamelServletContextPath=/regressiontests/Velocity, CamelVelocityTemplate=(this 
Map), ComponentInitTime=1716561470224, Connection=close, 
Cookie=_ga=GA1.1.1085399545.1665049218; 
_ga_J0TKN8HXSY=GS1.1.1715979059.148.0.1715979059.0.0.0; 
nPT0%3D--35c503a9ecbf1d3922b78a7289ee8eb8f80e1d36, Host=assimbly-test:9001, 
sec-ch-ua="Google Chrome";v="125", "Chromium";v="125", "Not.A/Brand";v="24", 
sec-ch-ua-mobile=?0, sec-ch-ua-platform="Windows", Sec-Fetch-Dest=document, 
Sec-Fetch-Mode=navigate, Sec-Fetch-Site=none, Sec-Fetch-User=?1, 
Upgrade-Insecure-Requests=1, User-Agent=Mozilla/5.0 (Windows NT 10.0; Win64; 
x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36} 
{code}

However when running the route with Camel 4 (using 4.6.0 on JDK21) I get the 
following error:


{code:java}
java.lang.StackOverflowError: null
        at 
java.base/java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:806)
        at java.base/java.lang.StringBuffer.append(StringBuffer.java:425)
        at java.base/java.io.StringWriter.write(StringWriter.java:79)
        at org.apache.camel.util.json.Jsoner.serialize(Jsoner.java:963)
        at org.apache.camel.util.json.Jsoner.serialize(Jsoner.java:1004)
        at org.apache.camel.util.json.Jsoner.serialize(Jsoner.java:1006) {code}



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