JMix Studio 1.3.9-213 throws this error on first project loading:
com.intellij.openapi.project.IndexNotReadyException: Please change caller according to com.intellij.openapi.project.IndexNotReadyException documentation
at com.intellij.openapi.project.IndexNotReadyException.create(IndexNotReadyException.java:67)
at com.intellij.util.indexing.FileBasedIndexImpl.handleDumbMode(FileBasedIndexImpl.java:844)
at com.intellij.util.indexing.FileBasedIndexImpl.ensureUpToDate(FileBasedIndexImpl.java:792)
at com.intellij.psi.stubs.StubIndexEx.getContainingIds(StubIndexEx.java:350)
at com.intellij.psi.stubs.StubIndexEx.processElements(StubIndexEx.java:157)
at com.intellij.psi.stubs.StubIndex.getElements(StubIndex.java:99)
at com.intellij.psi.stubs.StubIndex.getElements(StubIndex.java:87)
at com.intellij.psi.impl.java.stubs.index.JavaFullClassNameIndex.get(JavaFullClassNameIndex.java:34)
at com.intellij.psi.impl.file.impl.JavaFileManagerImpl.doFindClasses(JavaFileManagerImpl.java:88)
at com.intellij.psi.impl.file.impl.JavaFileManagerImpl.findClass(JavaFileManagerImpl.java:111)
at com.intellij.psi.impl.PsiElementFinderImpl.findClass(PsiElementFinderImpl.java:40)
at com.intellij.psi.impl.JavaPsiFacadeImpl.doFindClass(JavaPsiFacadeImpl.java:93)
at com.intellij.psi.impl.JavaPsiFacadeImpl.findClass(JavaPsiFacadeImpl.java:71)
at com.intellij.psi.impl.source.PsiJavaCodeReferenceElementImpl.resolve(PsiJavaCodeReferenceElementImpl.java:444)
at com.intellij.psi.impl.source.PsiJavaCodeReferenceElementImpl.access$100(PsiJavaCodeReferenceElementImpl.java:44)
at com.intellij.psi.impl.source.PsiJavaCodeReferenceElementImpl$OurGenericsResolver.resolve(PsiJavaCodeReferenceElementImpl.java:379)
at com.intellij.psi.impl.source.PsiJavaCodeReferenceElementImpl$OurGenericsResolver.resolve(PsiJavaCodeReferenceElementImpl.java:372)
at com.intellij.psi.impl.source.resolve.ResolveCache.lambda$resolveWithCaching$2(ResolveCache.java:184)
at com.intellij.openapi.util.Computable.get(Computable.java:16)
at com.intellij.psi.impl.source.resolve.ResolveCache.lambda$loggingResolver$4(ResolveCache.java:260)
at com.intellij.openapi.util.RecursionManager$1.computePreventingRecursion(RecursionManager.java:114)
at com.intellij.openapi.util.RecursionGuard.doPreventingRecursion(RecursionGuard.java:44)
at com.intellij.openapi.util.RecursionManager.doPreventingRecursion(RecursionManager.java:68)
at com.intellij.psi.impl.source.resolve.ResolveCache.resolve(ResolveCache.java:237)
at com.intellij.psi.impl.source.resolve.ResolveCache.resolveWithCaching(ResolveCache.java:184)
at com.intellij.psi.impl.PsiImplUtil.multiResolveImpl(PsiImplUtil.java:798)
at com.intellij.psi.impl.PsiImplUtil.multiResolveImpl(PsiImplUtil.java:790)
at com.intellij.psi.impl.PsiImplUtil.multiResolveImpl(PsiImplUtil.java:766)
at com.intellij.psi.impl.source.PsiJavaCodeReferenceElementImpl.multiResolve(PsiJavaCodeReferenceElementImpl.java:427)
at com.intellij.psi.impl.source.PsiJavaCodeReferenceElementImpl.advancedResolve(PsiJavaCodeReferenceElementImpl.java:421)
at com.intellij.psi.impl.source.PsiJavaCodeReferenceElementImpl.resolve(PsiJavaCodeReferenceElementImpl.java:356)
at com.intellij.psi.impl.source.PsiImportStatementBaseImpl.resolve(PsiImportStatementBaseImpl.java:64)
at com.intellij.psi.impl.source.PsiJavaFileBaseImpl.findExplicitDeclarations(PsiJavaFileBaseImpl.java:349)
at com.intellij.psi.impl.source.PsiJavaFileBaseImpl.lambda$getExplicitlyEnumeratedDeclarations$0(PsiJavaFileBaseImpl.java:333)
at com.intellij.openapi.util.NotNullLazyValue$4.compute(NotNullLazyValue.java:120)
at com.intellij.openapi.util.NotNullLazyValue$4.getValue(NotNullLazyValue.java:105)
at com.intellij.psi.impl.source.PsiJavaFileBaseImpl.lambda$getExplicitlyEnumeratedDeclarations$1(PsiJavaFileBaseImpl.java:334)
at com.intellij.util.containers.ContainerUtil.process(ContainerUtil.java:701)
at com.intellij.psi.impl.source.PsiJavaFileBaseImpl.processDeclarations(PsiJavaFileBaseImpl.java:291)
at com.intellij.psi.scope.util.PsiScopesUtil.treeWalkUp(PsiScopesUtil.java:61)
at com.intellij.psi.scope.util.PsiScopesUtil.treeWalkUp(PsiScopesUtil.java:40)
at com.intellij.psi.scope.util.PsiScopesUtil.resolveAndWalk(PsiScopesUtil.java:207)
at com.intellij.psi.scope.util.PsiScopesUtil.resolveAndWalk(PsiScopesUtil.java:136)
at com.intellij.psi.impl.source.PsiJavaCodeReferenceElementImpl.resolve(PsiJavaCodeReferenceElementImpl.java:493)
at com.intellij.psi.impl.source.PsiJavaCodeReferenceElementImpl.access$100(PsiJavaCodeReferenceElementImpl.java:44)
at com.intellij.psi.impl.source.PsiJavaCodeReferenceElementImpl$OurGenericsResolver.resolve(PsiJavaCodeReferenceElementImpl.java:379)
at com.intellij.psi.impl.source.PsiJavaCodeReferenceElementImpl$OurGenericsResolver.resolve(PsiJavaCodeReferenceElementImpl.java:372)
at com.intellij.psi.impl.source.resolve.ResolveCache.lambda$resolveWithCaching$2(ResolveCache.java:184)
at com.intellij.openapi.util.Computable.get(Computable.java:16)
at com.intellij.psi.impl.source.resolve.ResolveCache.lambda$loggingResolver$4(ResolveCache.java:260)
at com.intellij.openapi.util.RecursionManager$1.computePreventingRecursion(RecursionManager.java:114)
at com.intellij.openapi.util.RecursionGuard.doPreventingRecursion(RecursionGuard.java:44)
at com.intellij.openapi.util.RecursionManager.doPreventingRecursion(RecursionManager.java:68)
at com.intellij.psi.impl.source.resolve.ResolveCache.resolve(ResolveCache.java:237)
at com.intellij.psi.impl.source.resolve.ResolveCache.resolveWithCaching(ResolveCache.java:184)
at com.intellij.psi.impl.PsiImplUtil.multiResolveImpl(PsiImplUtil.java:798)
at com.intellij.psi.impl.source.PsiJavaCodeReferenceElementImpl.getCanonicalText(PsiJavaCodeReferenceElementImpl.java:294)
at com.intellij.psi.impl.source.PsiJavaCodeReferenceElementImpl.getCanonicalText(PsiJavaCodeReferenceElementImpl.java:278)
at com.intellij.psi.impl.source.tree.java.PsiAnnotationImpl.getQualifiedName(PsiAnnotationImpl.java:77)
at com.intellij.psi.PsiAnnotation.hasQualifiedName(PsiAnnotation.java:129)
at com.intellij.psi.impl.source.tree.java.PsiAnnotationImpl.hasQualifiedName(PsiAnnotationImpl.java:94)
at com.intellij.util.containers.ContainerUtil.exists(ContainerUtil.java:2007)
at com.intellij.codeInsight.AnnotationUtil.findOwnAnnotations(AnnotationUtil.java:103)
at com.intellij.codeInsight.AnnotationUtil.findAllAnnotations(AnnotationUtil.java:80)
at com.intellij.codeInsight.AnnotationUtil.findAnnotation(AnnotationUtil.java:62)
at com.intellij.codeInsight.AnnotationUtil.findAnnotation(AnnotationUtil.java:46)
at com.intellij.codeInsight.AnnotationUtil.findAnnotation(AnnotationUtil.java:39)
at com.haulmont.jmixstudio.flowui.theme.FlowThemeManager$findThemeData$1.compute(FlowThemeManager.kt:70)
at com.haulmont.jmixstudio.flowui.theme.FlowThemeManager$findThemeData$1.compute(FlowThemeManager.kt:25)
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:928)
at com.haulmont.jmixstudio.util.EntityUtil.ra(EntityUtil.java:790)
at com.haulmont.jmixstudio.flowui.theme.FlowThemeManager.findThemeData(FlowThemeManager.kt:67)
at com.haulmont.jmixstudio.flowui.theme.FlowThemeManager.updateThemeData(FlowThemeManager.kt:37)
at com.haulmont.jmixstudio.flowui.server.FlowServerManager.getContextClassLoader(FlowServerManager.kt:197)
at com.haulmont.jmixstudio.flowui.server.FlowServerManager.initServer(FlowServerManager.kt:135)
at com.haulmont.jmixstudio.flowui.server.FlowServerManager.access$initServer(FlowServerManager.kt:62)
at com.haulmont.jmixstudio.flowui.server.FlowServerManager$initServer$1.onSuccess(FlowServerManager.kt:117)
at com.intellij.openapi.externalSystem.util.ExternalSystemUtil$6.execute(ExternalSystemUtil.java:907)
at com.intellij.openapi.externalSystem.util.ExternalSystemUtil$8.run(ExternalSystemUtil.java:944)
at com.intellij.openapi.progress.impl.CoreProgressManager.startTask(CoreProgressManager.java:442)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.startTask(ProgressManagerImpl.java:114)
at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcessWithProgressAsynchronously$5(CoreProgressManager.java:493)
at com.intellij.openapi.progress.impl.ProgressRunner.lambda$submit$3(ProgressRunner.java:252)
at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:188)
at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$executeProcessUnderProgress$12(CoreProgressManager.java:608)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:683)
at com.intellij.openapi.progress.impl.CoreProgressManager.computeUnderProgress(CoreProgressManager.java:639)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:607)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:60)
at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:175)
at com.intellij.openapi.progress.impl.ProgressRunner.lambda$submit$4(ProgressRunner.java:252)
at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:702)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:699)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:699)
at java.base/java.lang.Thread.run(Thread.java:833)
Seems indexes in IntelliJ used too early without proper check.