[ 
http://jira.codehaus.org/browse/MCHANGES-97?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Benjamin Bentmann updated MCHANGES-97:
--------------------------------------

    Attachment: MCHANGES-97.zip

Well, I put a tiny POM aside to the already attached changes.xml. Also included 
is a debug log of my
{noformat}
mvn changes:announcement-generate -X
{noformat}
This was run against a SNAPSHOT build of  r617867.

Technical background from the [Velocity User 
Guide|http://velocity.apache.org/engine/releases/velocity-1.5/user-guide.html#set]:
bq. If the RHS is a property or method reference that evaluates to null, it 
will not be assigned to the LHS.

> Fix VTL errors
> --------------
>
>                 Key: MCHANGES-97
>                 URL: http://jira.codehaus.org/browse/MCHANGES-97
>             Project: Maven 2.x Changes Plugin
>          Issue Type: Improvement
>          Components: announcement
>    Affects Versions: 2.0-beta-3
>            Reporter: Benjamin Bentmann
>            Priority: Trivial
>         Attachments: changes.xml, MCHANGES-97.zip, vtl-errors.patch
>
>
> When calling {{mvn changes:announcement-generate}} for the attached 
> {{changes.xml}} VTL errors are logged due to the various null fields in the 
> {{Action}} bean:
> {noformat}
> [INFO] [changes:announcement-generate]
> [INFO] Creating announcement file from changes.xml...
> [ERROR] RHS of #set statement is null. Context will not be modified. 
> org/apache/maven/plugin/announcement/announcement.vm [line 30, column 1]
> [ERROR] RHS of #set statement is null. Context will not be modified. 
> org/apache/maven/plugin/announcement/announcement.vm [line 31, column 1]
> [ERROR] Left side ($!issue) of '!=' operation has null value. Operation not 
> possible. org/apache/maven/plugin/announcement/announcement.vm [line 32, 
> column 27]
> [ERROR] Left side ($!dueto) of '!=' operation has null value. Operation not 
> possible. org/apache/maven/plugin/announcement/announcement.vm [line 32, 
> column 65]
> [ERROR] RHS of #set statement is null. Context will not be modified. 
> org/apache/maven/plugin/announcement/announcement.vm [line 43, column 1]
> [ERROR] RHS of #set statement is null. Context will not be modified. 
> org/apache/maven/plugin/announcement/announcement.vm [line 44, column 1]
> [ERROR] RHS of #set statement is null. Context will not be modified. 
> org/apache/maven/plugin/announcement/announcement.vm [line 56, column 1]
> [ERROR] RHS of #set statement is null. Context will not be modified. 
> org/apache/maven/plugin/announcement/announcement.vm [line 57, column 1]
> [ERROR] RHS of #set statement is null. Context will not be modified. 
> org/apache/maven/plugin/announcement/announcement.vm [line 69, column 1]
> [ERROR] RHS of #set statement is null. Context will not be modified. 
> org/apache/maven/plugin/announcement/announcement.vm [line 70, column 1]
> [INFO] File created...
> {noformat}
> The attached patch goes the hard way and improves the VTL template to check 
> for nulls. Easier would be to establish an invariant for the bean properties 
> stating that they are never null but maybe empty, i.e. change all the setters 
> to convert null into an empty string.

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