#714 Protect against exceptions on lock release.

Author: yruslan

pramen/core/src/main/scala/za/co/absa/pramen/core/lock/TokenLockBase.scala

@@ -100,9 +100,12 @@ abstract class TokenLockBase(override val token: String) extends TokenLock {
     if (wasAcquired) {
       watcherThreadOpt.foreach(_.interrupt())
       watcherThreadOpt = None
-      releaseGuardLock()
-      JvmUtils.safeRemoveShutdownHook(shutdownHook)
-      TokenLockRegistry.unregisterLock(this)
+      try {
+        releaseGuardLock()
+      } finally {
+        JvmUtils.safeRemoveShutdownHook(shutdownHook)
+        TokenLockRegistry.unregisterLock(this)
+      }
       log.info(s"Lock released: '$escapedToken'.")
     }
   }

pramen/core/src/main/scala/za/co/absa/pramen/core/lock/TokenLockRegistry.scala

@@ -56,7 +56,7 @@ object TokenLockRegistry {
         try {
           l.release()
         } catch {
-          case NonFatal(ex) => log.warn(s"Unable to release the lock: ${l.token}")
+          case NonFatal(ex) => log.warn(s"Unable to release the lock: ${l.token}", ex)
         }
       }
       currentLocks.clear()