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https://issues.apache.org/jira/browse/GROOVY-11749?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Eric Milles closed GROOVY-11749.
--------------------------------
Assignee: Eric Milles
Resolution: Information Provided
> CompileStatic issues in Groovy 5
> --------------------------------
>
> Key: GROOVY-11749
> URL: https://issues.apache.org/jira/browse/GROOVY-11749
> Project: Groovy
> Issue Type: Bug
> Environment: Groovy 5.0.0, Gradle 8.14.3, JVM: 21.0.6
> Reporter: Per Nyfelt
> Assignee: Eric Milles
> Priority: Major
>
> When working on getting the Matrix project to work with Groovy 5 I
> encountered the following differences compared to 4.0.28 for static
> compilation:
> f is a csv commons formatter. The setHeader method has the following
> signature:
> {code:java}
> f.setHeader(String... headers)
> {code}
> In 4.0.28 i used to be able to just cast a List<String> to a String[] like
> this:
> {code:groovy}
> if (val instanceof List) {
> f.setHeader(val as String[])
> {code}
> But in Groovy 5 this gives me the following error:
> {code}
> java.lang.ClassCastException: class java.util.ArrayList cannot be cast to
> class [Ljava.lang.String; (java.util.ArrayList and [Ljava.lang.String; are in
> module java.base of loader 'bootstrap')
> {code}
> A workaround is to use the Java way i.e:
> {code:groovy}
> if (val instanceof List) {
> f.setHeader(val.toArray(new String[0]) as String[])
> {code}
> Another thing i hade to change was
> {code:groovy}
> static String asColumnName(int number) {
> StringBuilder sb = new StringBuilder()
> while (number-- > 0) {
> sb.append(('A' as char + (number % 26)) as char)
> number /= 26
> }
> return sb.reverse().toString()
> }
> {code}
> Which no longer compiles:
> {code}
> .../SpreadsheetUtil.groovy: 45: [Static type checking] - Cannot assign value
> of type java.math.BigDecimal to variable of type int
> {code}
> but had to be changed to
> {code:groovy}
> static String asColumnName(int number) {
> StringBuilder sb = new StringBuilder()
> while (number-- > 0) {
> sb.append(('A' as char + (number % 26)) as char)
> number = (int) (number / 26)
> }
> return sb.reverse().toString()
> }
> {code}
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