Cocoa-Puffs opened a new issue, #6154:
URL: https://github.com/apache/incubator-kie-drools/issues/6154
Java Version: 21
Spring Boot Version: 3.3.4
KIE Version: 9.44.0.Final
Short summary:
In Drools Template files if there are parameters on a given line that end
with a variable name a trailing space must be the last character of the line or
during compiling an exception is thrown stating that unclosed @if{} blocks
exist in the template file.
Detailed explanation:
Take for example the following drt snippet:
```
when
$c: Customer($balances : balances != null)
$b_thb: Balance(currency == "@{balanceType}") from $balances
then
```
Using either DataProviderCompiler or ObjectDataCompiler to compile the above
I get the following error:
Caused by: org.mvel2.CompileException: [Error: unclosed @if{} block.
expected @end{}]
[Near : {... nceType}");@end{} ....}]
The exception references the end of the action block. However when I replace
the parameter with a concrete example:
```
when
$c: Customer($balances : balances != null)
$b_thb: Balance(currency == "MAGIC_COIN") from $balances
then
```
The exception does not come. After a bit of digging around with the debugger
I have found that what happens is during compile time KIE wraps every line in
if statements that use a parameter, for example the above snippet turns into:
```
when
$c: Customer($balances : balances != null)
@if{balanceType != null} $b_thb: Balance(currency == "@{balanceType}")
from $balances@end{}
then
```
It then fails to read the @end{} statement as the closure of the if at the
beginning of the line resulting in an exception. If I then modify the drt file
to have a space at the end of this line the compilation is successful. Checking
out the ExpressionNode using the debugger we can see the following:
```
when
$c: Customer($balances : balances != null)
@if{balanceType != null} $b_thb: Balance(currency == "@{balanceType}")
from $balances @end{}
then
```
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