Simplify the dead thread-group fallback left by SystemGetSecurityManagerToNull - #1255

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cannot find symbol

finalize() has protected access in Object

finalize() has protected access in Object

finalize() has protected access in Object

finalize() has protected access in Object

JRE6WrapperDataSource is not abstract and does not override abstract method getParentLogger() in CommonDataSource

clone() has protected access in Reference

clone() has protected access in Reference

clone() has protected access in Reference

[removal] SecurityManager in java.lang has been deprecated and marked for removal

[removal] SecurityManager in java.lang has been deprecated and marked for removal

[removal] countStackFrames() in Thread has been deprecated and marked for removal

[removal] countStackFrames() in Thread has been deprecated and marked for removal

[removal] finalize() in Object has been deprecated and marked for removal

[removal] finalize() in Object has been deprecated and marked for removal

[removal] finalize() in Object has been deprecated and marked for removal

[removal] finalize() in Object has been deprecated and marked for removal

[removal] finalize() in Object has been deprecated and marked for removal

[removal] stop() in Thread has been deprecated and marked for removal

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