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https://issues.apache.org/jira/browse/CAMEL-20802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17849692#comment-17849692
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Raymond edited comment on CAMEL-20802 at 5/27/24 11:17 AM:
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I tried to make a reproducer based on xml-main, but it works as expected. It
works like before (in Camel 2 and Camel 3).
I do however found what was the issue was. The problem was not so much in the
Velocity, but that the header was set with a simple expression:
{code:java}
<setHeader name="CamelVelocityTemplate">
<simple>${headers}</simple>
</setHeader> {code}
This code was always used this way (don't know why, not written by me). I
wonder: Is (or was) the CamelVelocityTemplate header as a Camel header
evaluated differently than a normal header?
Now it seems that it first evaluates it as simple, before it evaluate it as
velocity template (but then it's already a string).
The error occurs thus occurs when it evaluates the expression ${headers} in
simple. When I set CamelVelocityTemplate as a constant, like it also done in
the Velocity documentation, it works.
was (Author: skin27):
I tried to make a reproducer based on xml-main, but it works as expected. It
works like before (in Camel 2 and Camel 3).
I do however found what was the issue was. The problem was not so much in the
Velocity, but that the header was set with a simple expression:
{code:java}
<setHeader name="CamelVelocityTemplate">
<simple>${headers}</simple>
</setHeader> {code}
This code was always used this way (don't know why, not written by me). Is (or
was) the CamelVelocityTemplate header as a Camel header evaluated differently
than a normal header. Now it seems that it first evaluates it as simple, before
it evaluate it as velocity template (but then it's already a string).
When it first evaluates it ${headers} in simple is where the error occurs. When
I set CamelVelocityTemplate as a constant, like it also done in the
documentation, it works.
> Velocity shows error when using ${headers}
> ------------------------------------------
>
> Key: CAMEL-20802
> URL: https://issues.apache.org/jira/browse/CAMEL-20802
> Project: Camel
> Issue Type: Bug
> Components: camel-velocity
> Affects Versions: 4.6.0
> Reporter: Raymond
> Priority: Minor
> Attachments: main-xml.zip
>
>
> In Camel 3 (3.20.8) I have the following route:
> {code:java}
> <route id="myRoute">
> <from uri="direct:in"/>
> <setHeader headerName="CamelVelocityTemplate">
> <simple>${headers}</simple>
> </setHeader>
> <to uri="velocity:generate"/>
> <to
> uri="log:foo//?skipBodyLineSeparator=false&multiline=true&showHeaders=false&showBody=true&showBodyType=true&showFiles=true&showException=false&showStackTrace=false&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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