Findclass | Scans directories | Application Framework library

You need to add scala-compiler configuration to your pom.xml. The problem is without that there is nothing to compile your SparkTrans.scala file into java classes.

Add:

You can simply create the class file MainActivity.java with the Java code.

The log shows that the ResourcesPlugin is being found but its plug-in activator is getting a null pointer exception when it tries to get the IContentTypeManager.

The content type manager is provided using OSGi declarative services but you have not included org.apache.felix.scr which deals with this.

So at a minimum you need to include org.apache.felix.scr and start it in the section:

This cited article is wrong, even with these undefined terms like “preload” and “when the program first actively uses the class”.

If “preload” is supposed to mean eagerly resolving referenced classes, we can refer to the Java Language Specification, §12.1.2.:

An implementation may resolve symbolic references from a class or interface that is being linked very early, even to the point of resolving all symbolic references from the classes and interfaces that are further referenced, recursively. (This resolution may result in errors from these further loading and linking steps.)

It then states about the potential errors:

The only requirement on when resolution is performed is that any errors detected during resolution must be thrown at a point in the program where some action is taken by the program that might, directly or indirectly, require linkage to the class or interface involved in the error. Using the "static" example implementation choice described above, loading and linkage errors could occur before the program is executed if they involved a class or interface mentioned in the class Test or any of the further, recursively referenced, classes and interfaces.

So it’s definitely wrong to say that loading or linkage errors were only reportable “when the program first actively uses the class”, even when the article didn’t care to explain what constitutes an active use.

As explained in this answer, initialization is performed under well defined conditions and the behavior of your program is understandable when overcoming the common confusion of loading and initialization. To evaluate the expression MyChild1.str, loading of the class MyChild1 is unavoidable and only after the class has been loaded, it is possible to determine that it doesn’t have a field str but a superclass that has. So while it will be unavoidably loaded it will not get initialized, as neither of the specified actions (like the access to a static field) has been performed.

As you can recognize from your stack trace, the NoClassDefFoundError has been thrown right before evaluating the expression MyChild1.str, which is already as lazy as possible. Valid places to throw the error would have been the beginning of the method’s execution, the loading and resolving of the Mytest1 class, or, as the linked part of the specification says, even before the execution of the entire program starts.

While the point of loading and resolving and hence, the point of throwing the error, is left to the particular implementation, all valid implementations will agree in throwing the error before coming to evaluate the expression MyChild1.str.

The class com.google.firebase.iid.FirebaseInstanceId has been deprecated and removed from the latest versions of the aar:

Update: androidx.compose.compiler:compiler:1.0.0-beta08 is released (June 2, 2021).

From this version, the expected version of Kotlin is 1.5.10.

I solved this issue using maven settings xml file. I followed below steps.

1. Create maven settings.xml in root directory.

You can check the value of current value in the dictionary, and as you know the value is also a dictionary you can check it again like this:

Issue was with web.xml. It had servlet entries for ZookeeperInfoServlet. Removing those, fixed the issue.