jamesfredley commented on issue #15330:
URL: https://github.com/apache/grails-core/issues/15330#issuecomment-3885671270
The Problem
In application.yml (line 35), the configuration is:
```
environments:
development:
serverURL: https://grails7-absolute-link-issue.domain.com
```
The Fix
Change the configuration to one of these patterns:
Option 1: Environment-specific (recommended)
```
environments:
development:
grails:
serverURL: https://grails7-absolute-link-issue.domain.com
```
Option 2: Global setting
```
grails:
serverURL: https://grails7-absolute-link-issue.domain.com
```
The configuration needs to be nested under the `grails:` key, not directly
under `environments.development:`.
The null you're seeing is a race condition in the controller code, not a
configuration problem.
Look at the controller logic:
```
def index() {
String link
Thread.start { // Starts a NEW thread asynchronously
try {
link = grailsLinkGenerator.link(...) // Runs in background
} catch (Exception e) {
e.printStackTrace()
}
}
// Main thread continues immediately without waiting!
String link2 = grailsLinkGenerator.link(...) // Executes in main thread
render link + link2 // Renders BEFORE background thread completes
}
```
What happens:
1. Line 12: Thread starts in background
2. Line 26-31: Main thread immediately generates link2
3. Line 33: render link + link2 executes before the background thread
finishes
4. At this point, link is still null because the thread hasn't completed yet
Updated controller that does not have this issue:
```
package grails7.absolute.link.issue
import grails.web.mapping.LinkGenerator
import java.util.concurrent.Callable
import java.util.concurrent.Executors
import java.util.concurrent.Future
class MakeLinkController {
LinkGenerator grailsLinkGenerator
def index() {
// Use ExecutorService to properly wait for thread completion
def executor = Executors.newSingleThreadExecutor()
try {
// Submit task and get Future
Future<String> future = executor.submit(new Callable<String>() {
@Override
String call() throws Exception {
return grailsLinkGenerator.link(
absolute: true,
controller: 'MakeLink',
action: 'index',
id: 1
)
}
})
// Get result from background thread (waits for completion)
String link = future.get()
// Generate link in web context
String link2 = grailsLinkGenerator.link(
absolute: true,
controller: 'MakeLink',
action: 'index',
id: 1
)
render """
Link from background thread: ${link}
Link from web context: ${link2}
"""
} finally {
executor.shutdown()
}
}
}
```
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