### Eclipse Workspace Patch 1.0
#P jackrabbit-core
Index: src/main/java/org/apache/jackrabbit/core/lock/LockManagerImpl.java
===================================================================
--- src/main/java/org/apache/jackrabbit/core/lock/LockManagerImpl.java	(revision 1492642)
+++ src/main/java/org/apache/jackrabbit/core/lock/LockManagerImpl.java	(working copy)
@@ -654,12 +654,17 @@
     public void checkLock(Path path, Session session)
             throws LockException, RepositoryException {
 
-        PathMap.Element<LockInfo> element = lockMap.map(path, false);
-        LockInfo info = element.get();
-        if (info != null) {
-            if (element.hasPath(path) || info.isDeep()) {
-                checkLock(info, session);
+        acquire();
+        try {
+            PathMap.Element<LockInfo> element = lockMap.map(path, false);
+            LockInfo info = element.get();
+            if (info != null) {
+                if (element.hasPath(path) || info.isDeep()) {
+                    checkLock(info, session);
+                }
             }
+        } finally {
+            release();
         }
     }
 
@@ -688,18 +693,23 @@
      */
     public void checkUnlock(Session session, NodeImpl node)
             throws LockException, RepositoryException {
-
-        // check whether node is locked by this session
-        PathMap.Element<LockInfo> element =
-            lockMap.map(getPath((SessionImpl) session, node.getId()), true);
-        if (element == null) {
-            throw new LockException("Node not locked: " + node);
+        acquire();
+        
+        try {
+            // check whether node is locked by this session
+            PathMap.Element<LockInfo> element =
+                lockMap.map(getPath((SessionImpl) session, node.getId()), true);
+            if (element == null) {
+                throw new LockException("Node not locked: " + node);
+            }
+            LockInfo info = element.get();
+            if (info == null) {
+                throw new LockException("Node not locked: " + node);
+            }
+            checkUnlock(info, session);
+        } finally {
+            release();
         }
-        LockInfo info = element.get();
-        if (info == null) {
-            throw new LockException("Node not locked: " + node);
-        }
-        checkUnlock(info, session);
     }
 
     /**
@@ -728,6 +738,8 @@
      */
     public void addLockToken(SessionImpl session, String lt) throws LockException, RepositoryException {
         try {
+            acquire();
+            
             NodeId id = LockInfo.parseLockToken(lt);
 
             NodeImpl node = (NodeImpl) sysSession.getItemManager().getItem(id);
@@ -754,6 +766,8 @@
             String msg = "Bad lock token: " + e.getMessage();
             log.warn(msg);
             throw new LockException(msg);
+        } finally {
+            release();
         }
     }
 
@@ -764,6 +778,8 @@
             throws LockException, RepositoryException {
 
         try {
+            acquire();
+            
             NodeId id = LockInfo.parseLockToken(lt);
 
             NodeImpl node = (NodeImpl) sysSession.getItemManager().getItem(id);
@@ -787,6 +803,8 @@
             String msg = "Bad lock token: " + e.getMessage();
             log.warn(msg);
             throw new LockException(msg);
+        } finally {
+            release();
         }
     }