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https://issues.apache.org/jira/browse/VELOCITY-988?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claude Brisson resolved VELOCITY-988.
-------------------------------------
Fix Version/s: 2.5
Resolution: Fixed
> Regression Bug in Velocity Library: JSON if Condition with {} Failing in v2.3
> and Later
> ---------------------------------------------------------------------------------------
>
> Key: VELOCITY-988
> URL: https://issues.apache.org/jira/browse/VELOCITY-988
> Project: Velocity
> Issue Type: Bug
> Components: Engine
> Affects Versions: 2.3, 2.4, 2.4.1
> Reporter: Muskaan12
> Assignee: Claude Brisson
> Priority: Major
> Fix For: 2.5
>
>
> I have identified a regression bug in the Velocity library that affects the
> handling of {{if}} conditions within JSON documents when curly braces
> ({{{{}}{}{{}}}}) are present. This issue is identified in version 2.3 and
> present in later versions as well, but was working as expected in version
> 1.7.
> To help reproduce the issue, I have provided a sample code along with the
> stack trace in the following
>
> {code:java}
> public static void main(String[] args) {
> // Initialize the VelocityEngine
> VelocityEngine velocityEngine = new VelocityEngine();
> velocityEngine.init();
> // Define the template with a basic and simple if condition
> String template = "{\n" +
> " #if($!{$SubjectData.StudyEventData['@StudyEventRepeatKey']})\n" +
> " \"eventRepeatKey\":
> \"$SubjectData.StudyEventData['@StudyEventRepeatKey']\",\n" +
> " #end\n" +
> " \"otherField\": \"someValue\"\n" +
> "}";
> // Create VelocityContext and add data
> VelocityContext context = new VelocityContext();
> context.put("SubjectData", Map.of("StudyEventData",
> Map.of("@StudyEventRepeatKey", "123")));
> // Render the template
> StringWriter writer = new StringWriter();
> velocityEngine.evaluate(context, writer, "Template", template);
> // Print the rendered JSON
> System.out.println(writer.toString());
> }{code}
>
> *Stacktrace:*
> *=============*
> *Exception in thread "main" org.apache.velocity.excep*
> *Exception in thread "main"
> org.apache.velocity.exception.ParseErrorException: Encountered ")\n" at
> Template[line 2, column 64]*
> *Was expecting one of:*
> *"||" ...*
> *")" ...*
> *<WHITESPACE> ...*
> *<NEWLINE> ...*
> *"-" ...*
> *"+" ...*
> {*}"{*}" ...*
> *"/" ...*
> *"%" ...*
> *<LOGICAL_AND> ...*
> *<LOGICAL_OR> ...*
> *<LOGICAL_LT> ...*
> *<LOGICAL_LE> ...*
> *<LOGICAL_GT> ...*
> *<LOGICAL_GE> ...*
> *<LOGICAL_EQUALS> ...*
> *<LOGICAL_NOT_EQUALS> ...*
> **
> *at
> org.apache.velocity.runtime.RuntimeInstance.evaluate(RuntimeInstance.java:1440)*
> *at
> org.apache.velocity.runtime.RuntimeInstance.evaluate(RuntimeInstance.java:1398)*
> *at org.apache.velocity.app.VelocityEngine.evaluate(VelocityEngine.java:213)*
> *at org.example.VelocityExample.main(VelocityExample.java:28)*
> *tion.ParseErrorException: Encountered ")\n" at Template[line 2, column 64]*
> *Was expecting one of:*
> *"||" ...*
> *")" ...*
> *<WHITESPACE> ...*
> *<NEWLINE> ...*
> *"-" ...*
> *"+" ...*
> {*}"{*}" ...*
> *"/" ...*
> *"%" ...*
> *<LOGICAL_AND> ...*
> *<LOGICAL_OR> ...*
> *<LOGICAL_LT> ...*
> *<LOGICAL_LE> ...*
> *<LOGICAL_GT> ...*
> *<LOGICAL_GE> ...*
> *<LOGICAL_EQUALS> ...*
> *<LOGICAL_NOT_EQUALS> ...*
> **
> *at
> org.apache.velocity.runtime.RuntimeInstance.evaluate(RuntimeInstance.java:1440)*
> *at
> org.apache.velocity.runtime.RuntimeInstance.evaluate(RuntimeInstance.java:1398)*
> *at org.apache.velocity.app.VelocityEngine.evaluate(VelocityEngine.java:213)*
> *at org.example.VelocityExample.main(VelocityExample.java:28)*
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