mbien commented on issue #7760:
URL: https://github.com/apache/netbeans/issues/7760#issuecomment-2357512684
so there are several variations of this exception in the log
```
WARNING [org.netbeans.modules.java.source.indexing.JavaIndex]: Exception
while checking cache validity for root:
file:/C:/Java/Projets/ETPQv3/jhipster_upgrade/src/main/resources/
org.apache.maven.artifact.InvalidArtifactRTException: For artifact
{org.springframework.boot:spring-boot-configuration-processor:null:jar}: The
version cannot be empty.
at
org.apache.maven.artifact.DefaultArtifact.validateIdentity(DefaultArtifact.java:162)
at
org.apache.maven.artifact.DefaultArtifact.<init>(DefaultArtifact.java:142)
at
org.netbeans.modules.maven.api.PluginPropertyUtils.getPluginPathProperty(PluginPropertyUtils.java:812)
at
org.netbeans.modules.maven.classpath.AnnotationProcClassPathImpl.getCompileArtifacts(AnnotationProcClassPathImpl.java:94)
at
org.netbeans.modules.maven.classpath.AnnotationProcClassPathImpl.createPath(AnnotationProcClassPathImpl.java:67)
at
org.netbeans.modules.maven.classpath.AbstractProjectClassPathImpl.getPath(AbstractProjectClassPathImpl.java:153)
at
org.netbeans.modules.maven.classpath.AbstractProjectClassPathImpl.getResources(AbstractProjectClassPathImpl.java:144)
at org.netbeans.api.java.classpath.ClassPath.entries(ClassPath.java:363)
at
org.netbeans.modules.maven.classpath.ClassPathProviderImpl$AnnotationPathSelector.getActiveClassPath(ClassPathProviderImpl.java:685)
at
org.netbeans.spi.java.classpath.support.MuxClassPathImplementation.getActiveClassPath(MuxClassPathImplementation.java:156)
at
org.netbeans.spi.java.classpath.support.MuxClassPathImplementation.getResources(MuxClassPathImplementation.java:89)
at org.netbeans.api.java.classpath.ClassPath.entries(ClassPath.java:363)
at
org.netbeans.api.java.classpath.ClassPath.getRoots(ClassPath.java:248)
at
org.netbeans.modules.java.source.indexing.APTUtils.listenOnProcessorPath(APTUtils.java:343)
at
org.netbeans.modules.java.source.indexing.APTUtils.listen(APTUtils.java:329)
at
org.netbeans.modules.java.source.indexing.APTUtils.create(APTUtils.java:234)
at
org.netbeans.modules.java.source.indexing.APTUtils.get(APTUtils.java:181)
at
org.netbeans.modules.java.source.indexing.JavaCustomIndexer$MetadataCheck.call(JavaCustomIndexer.java:1499)
at
org.netbeans.modules.java.source.indexing.JavaCustomIndexer$MetadataCheck.call(JavaCustomIndexer.java:1486)
[catch] at
org.openide.util.RequestProcessor$WaitableCallable.call(RequestProcessor.java:1280)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
at
org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1420)
at
org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45)
at org.openide.util.lookup.Lookups.executeWith(Lookups.java:287)
at
org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2035)
```
before that there were some TopComponent persistence exceptions, which are
_usually_ harmless but they can indicate that a opened project was moved or
removed and NB can't find it anymore.
Does your project specify an annotation processor somewhere without setting
the version of that artifact?
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