java.lang.LinkageError - loader constraints violated
Symptom: "BeanCreationException: Error creating bean with name", "java.lang.LinkageError: loader constraints violated"
Cause: the class has already been loaded from different location than the plugin
In this case the
log4j class appears to be the cause of the error. Note that this error will also occur if your plugin has imported but not otherwise used the class that is using the missing class (so beware of
import foo.* statements).