Hi,
I have plugin code that adds a line marker. Works nice as long as I use the mouse to navigate. When I use the related items shortcut it opens a (different) popup and throws the exception for each of my items and brings up the “IDE error occurred” notification.
my code goes like this:
package io.openapiprocessor.intellij
import com.intellij.codeInsight.daemon.RelatedItemLineMarkerInfo
import com.intellij.codeInsight.daemon.RelatedItemLineMarkerProvider
import com.intellij.codeInsight.navigation.NavigationGutterIconBuilder
import com.intellij.icons.AllIcons
import com.intellij.openapi.components.service
import com.intellij.psi.PsiElement
import com.intellij.util.IconUtil
import org.jetbrains.yaml.psi.YAMLKeyValue
import org.slf4j.Logger
import org.slf4j.LoggerFactory
class OpenApiPathLineMarker: RelatedItemLineMarkerProvider() {
private val log: Logger = LoggerFactory.getLogger(this.javaClass.name)
override fun collectNavigationMarkers(
element: PsiElement,
result: MutableCollection<in RelatedItemLineMarkerInfo<*>>
) {
if (element !is YAMLKeyValue)
return
if(element.keyText != "paths")
return
if(!isOpenApi(element))
return
val pathTargetService = service<PathTargetService>()
element.value?.children?.forEach { path ->
if (path !is YAMLKeyValue)
return@forEach
val isPath = path.keyText.startsWith("/")
if (!isPath) {
log.warn("expected to find path but found {}", path.keyText)
}
// returns List<PsiElement>
val targets = pathTargetService.findPathTargets(path.project, path.keyText)
if (targets.isEmpty()) {
log.warn("found no targets!")
return@forEach
}
val builder = NavigationGutterIconBuilder
.create(icon)
.setTooltipText(I18n.TOOLTIP_TEXT)
.setPopupTitle(I18n.POPUP_TITLE)
.setTargets(targets)
result.add(builder.createLineMarkerInfo(path.key!!))
}
}
private fun isOpenApi(element: YAMLKeyValue): Boolean {
return element.parent.children.any {
it.firstChild.text == "openapi"
}
}
private val icon = IconUtil.scale(AllIcons.Nodes.Interface, null, 0.875f)
object I18n {
val TOOLTIP_TEXT = i18n("line.marker.openapi.path.tooltip")
val POPUP_TITLE = i18n("line.marker.openapi.path.title")
}
}
After several iterations with the ai (it usually provides code that does not compile, apologizes and then provides broken code again.. 
) it came up with this code:
val lazyTargets: NotNullLazyValue<Collection<PsiElement>> = NotNullLazyValue.createValue {
ApplicationManager.getApplication().runReadAction<Collection<PsiElement>> {
pathTargetService.findPathTargets(path.project, path.keyText)
}
}
But it doesn’t help, it still throws the exception. Using 2025.1 platform.
What would be the proper solution to avoid the exceptions?
com.intellij.diagnostic.PluginException: PSI element for DataKey("selectedItems") is provided on EDT by com.intellij.ui.popup.list.ListPopupImpl$MyList. Use `DataSink.lazy` to provide such data
at com.intellij.diagnostic.PluginProblemReporterImpl.createPluginExceptionByClass(PluginProblemReporterImpl.java:23)
at com.intellij.diagnostic.PluginException.createByClass(PluginException.java:90)
at com.intellij.ide.impl.DataValidators.reportPsiElementOnEdt(DataValidators.java:126)
at com.intellij.ide.impl.DataValidators.isDataValid(DataValidators.java:85)
at com.intellij.ide.impl.DataValidators.validOrNull(DataValidators.java:78)
at com.intellij.openapi.actionSystem.impl.MySink.set(PreCachedDataContext.kt:488)
at com.intellij.ui.popup.util.PopupImplUtil.uiSnapshotForList(PopupImplUtil.java:67)
at com.intellij.ui.popup.list.ListPopupImpl$MyList.uiDataSnapshot(ListPopupImpl.java:864)
at com.intellij.openapi.actionSystem.impl.MySink.uiDataSnapshot(PreCachedDataContext.kt:530)
at com.intellij.openapi.actionSystem.DataSink$Companion.uiDataSnapshot(UiDataProvider.kt:210)
at com.intellij.openapi.actionSystem.impl.PreCachedDataContextKt.cacheProviderData(PreCachedDataContext.kt:411)
at com.intellij.openapi.actionSystem.impl.PreCachedDataContextKt.cacheComponentsData(PreCachedDataContext.kt:394)
at com.intellij.openapi.actionSystem.impl.PreCachedDataContextKt.access$cacheComponentsData(PreCachedDataContext.kt:1)
at com.intellij.openapi.actionSystem.impl.PreCachedDataContext.<init>(PreCachedDataContext.kt:96)
at com.intellij.openapi.actionSystem.impl.Utils.createAsyncDataContext(Utils.kt:163)
at com.intellij.openapi.fileEditor.impl.IdeUiServiceImpl.createUiDataContext(IdeUiServiceImpl.java:79)
at com.intellij.ide.impl.DataManagerImpl.getDataContext(DataManagerImpl.java:283)
at com.intellij.ide.impl.DataManagerImpl.getDataContext(DataManagerImpl.java:309)
at com.intellij.openapi.keymap.impl.IdeKeyEventDispatcher.dispatchKeyEvent(IdeKeyEventDispatcher.kt:297)
at com.intellij.ide.IdeEventQueue.dispatchKeyEvent(IdeEventQueue.kt:515)
at com.intellij.ide.IdeEventQueue._dispatchEvent$lambda$17(IdeEventQueue.kt:474)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction$lambda$6(AnyThreadWriteThreadingSupport.kt:274)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWithTemporaryThreadLocal(AnyThreadWriteThreadingSupport.kt:204)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:274)
at com.intellij.openapi.application.impl.AnyThreadWriteThreadingSupport.runPreventiveWriteIntentReadAction(AnyThreadWriteThreadingSupport.kt:218)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.kt:474)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$12$lambda$11$lambda$10$lambda$9(IdeEventQueue.kt:307)
at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:864)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$12$lambda$11$lambda$10(IdeEventQueue.kt:306)
at com.intellij.ide.IdeEventQueueKt.performActivity$lambda$3(IdeEventQueue.kt:958)
at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:117)
at com.intellij.ide.IdeEventQueueKt.performActivity(IdeEventQueue.kt:958)
at com.intellij.ide.IdeEventQueue.dispatchEvent$lambda$12(IdeEventQueue.kt:301)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.kt:341)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:207)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:92)
