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http://www.stripesframework.org/jira/browse/STS-877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12800#comment-12800
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Danilo Ghirardelli commented on STS-877:
----------------------------------------
Using the {{.isEmpty()}} breaks the compatibility with Java 1.5, because is
Java 1.6 only. I opened STS-890 to use another way to check the string.
> Meaningful error message when an "on" in @Validate annotation is an empty
> String
> --------------------------------------------------------------------------------
>
> Key: STS-877
> URL: http://www.stripesframework.org/jira/browse/STS-877
> Project: Stripes
> Issue Type: Improvement
> Components: Validation
> Affects Versions: Release 1.5.6
> Reporter: Yannik Hampe
> Assignee: Ben Gunter
> Priority: Minor
> Fix For: Release 1.5.7, Release 1.6
>
>
> If a property has an annotation @Validate(on="") this is an error. I
> accidentally did just this in my project and it took me some time to figure
> out where the weird exception was coming from.
> I propose to add a more meaningful error message for example with the help of
> the following patch:
> {code:java}
> ### Eclipse Workspace Patch 1.0
> #P stripes
> Index: stripes/src/net/sourceforge/stripes/validation/ValidationMetadata.java
> ===================================================================
> --- stripes/src/net/sourceforge/stripes/validation/ValidationMetadata.java
> (revision 1487)
> +++ stripes/src/net/sourceforge/stripes/validation/ValidationMetadata.java
> (working copy)
> @@ -205,9 +205,13 @@
> this.on = null;
> }
> else {
> + if (on[0].isEmpty())
> + throw new IllegalArgumentException("the on property of
> a @Validate annotation must not be an empty string");
> this.on = new HashSet<String>();
> this.onIsPositive = !(on[0].charAt(0) == '!');
> for (String s : on) {
> + if (s.isEmpty())
> + throw new IllegalArgumentException("the on property of
> a @Validate annotation must not be an empty string");
> if (this.onIsPositive) {
> this.on.add(s);
> }
> {code}
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