[jira] [Commented] (FREEMARKER-234) BeansWrapper does not expose Boolean "is" getters as properties

["Dániel Dékány (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FREEMARKER-234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18034878#comment-18034878 ] 

Dániel Dékány commented on FREEMARKER-234:
------------------------------------------

That's because according to the JavaBeans spec., "is" methods are for primitive {{boolean}}-s. For {{Boolean}} it must be a "get" method. (This is not even enforced by FreeMarker, we just use {{java.beans.Introspector}}, which it official implementation of JavaBeans.)

> BeansWrapper does not expose Boolean "is" getters as properties
> ---------------------------------------------------------------
>
>                 Key: FREEMARKER-234
>                 URL: https://issues.apache.org/jira/browse/FREEMARKER-234
>             Project: Apache Freemarker
>          Issue Type: Bug
>    Affects Versions: 2.3.34
>         Environment: OpenJDK 17, Windows 10
>            Reporter: John Pace
>            Priority: Major
>
> According to the official [documentation|https://freemarker.apache.org/docs/pgui_misc_beanwrapper.html#beanswrapper_hash]:
> {quote}Every object will be wrapped into a TemplateHashModel that will expose JavaBeans properties and methods of the object. This way, you can use model.foo in the template to invoke obj.getFoo() or obj.isFoo() methods.
> {quote}
> However, this does not hold true for getters returning java.lang.Boolean.
> {code:java}
>  public class MyObject {
>     private Boolean obsolete = Boolean.TRUE;
>     public Boolean isObsolete() {
>         return obsolete;
>     }
> }{code}
> {code:java}
> <!-- Works -->
> <#if myobject.isObsolete()>obsolete</#if>
> <!-- Does NOT work -->
> <#if myobject.obsolete>obsolete</#if> {code}
> {code:java}
> 19:55:46,241 ERROR f.runtime - Error executing FreeMarker template
> freemarker.core.InvalidReferenceException: The following has evaluated to null or missing:
> ==> myobject.obsolete  [in template "templates/test.ftlh" at line 5, column 12]
> ----
> Tip: It's the step after the last dot that caused this error, not those before it.
> ----
> Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??{code}



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