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https://issues.apache.org/jira/browse/CAMEL-25836?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-25836.
---------------------------------
Resolution: Fixed
> camel-jte - a template given in the CamelJteTemplate header is compiled again
> for every exchange, and each compiled class and its files are kept for ever
> ---------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: CAMEL-25836
> URL: https://issues.apache.org/jira/browse/CAMEL-25836
> Project: Camel
> Issue Type: Bug
> Reporter: shashank
> Assignee: shashank
> Priority: Major
> Fix For: 4.24.0
>
>
> With {{allowTemplateFromHeader=true}}, a template given in the
> {{CamelJteTemplate}} header is handed to the JTE engine under the exchange id
> as its name ({{JteEndpoint.onExchange}}, main 20cdb309f7d0):
> {code:java}
> if (codeResolver != null) {
> name = exchange.getExchangeId();
> codeResolver.addTemplateFromHeader(name, content);
> }
> ...
> template.render(name, dataModel, buffer);
> {code}
> The runtime JTE engine ({{TemplateEngine.create}}, used unless
> {{preCompile=true}}) compiles each template name it has not seen into a Java
> class. It keeps that class in its template cache, keyed by the name, and
> writes the generated source and class files to the work directory
> ({{workDir}}, default {{jte-classes}}). As every exchange has a new id, every
> exchange compiles the same template again (javac in the routing thread). The
> engine also keeps one more class in memory (template cache and metaspace) and
> leaves two more files on disk. Nothing ever removes them while the
> CamelContext runs. A route that renders a header template for every message
> grows without bound until the JVM runs out of metaspace or heap, or the disk
> fills.
> *Fix*: name a header template after a SHA-256 digest of its content
> ({{header-<hex>}}). The same template is compiled once and reused, and the
> engine keeps one class per distinct template text, as it does for the
> templates of the endpoint URI. Templates given by resource URI or in the
> endpoint are not affected.
> *Tests*: new {{JteTemplateFromHeaderCompiledOnceTest}} (2 tests) counts the
> compiled classes in the work directory. {{sameTemplateIsCompiledOnce}} (20
> exchanges, one template) fails on main: {{expected: <1> but was: <20>}}.
> {{eachDistinctTemplateIsCompiledOnce}} (two templates, 10 exchanges each)
> fails on main: {{expected: <2> but was: <20>}}. Both pass with the fix, and
> the rendered output of every exchange is checked. camel-jte unit tests with
> the fix: 6 run, 0 failures.
> *How it was found*: a search for per-exchange keys (exchange ids) put into
> long-lived maps across the components, looking for unbounded leaks, then a
> read of the JTE 3.2.4 runtime ({{TemplateEngine.templateCache}}, keyed by
> template name), then the JUnit test above.
> *Affected*: main, camel-4.23.x, camel-4.22.x, camel-4.18.x, camel-4.14.x and
> camel-4.10.x (the same {{name = exchange.getExchangeId()}}; read, not run).
> Only routes that enable {{allowTemplateFromHeader}} and set the
> {{CamelJteTemplate}} header are affected.
> _Filed with Claude Code on behalf of allthingssecurity._
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