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  1. Jackrabbit Content Repository
  2. JCR-912

OverlappingFileLockException with JRE 1.6

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      Per email discussion:
      On Mon, 2007-02-26 at 10:26 +0100, Marcel Reutegger wrote:
      > > just my 2c, I didn't really investigated this issue in more detail...
      > >
      > > according to the javadoc of FileChannel.tryLock() the
      > > OverlappingFileLockException is thrown if the JVM already holds a lock on the
      > > channel.
      > >
      > > in contrast, the current check in the repository startup method primarily
      > > focuses on the situation where two JVMs start a repository on the same home
      > > directory.
      > >
      > > I'd say the OverlappingFileLockException is thrown because two repository
      > > instances are startup within the same JVM using the same repository home
      > > directory.
      > >
      > > I suggest we add a catch clause, which also covers OverlappingFileLockException
      > > in addition to IOException.
      > >
      > > regards
      > > marcel
      > >
      > > Stefan Guggisberg wrote:
      > > > btw, afaik OverlappingFileLockException is only thrown on linux,
      > > > FileChannel#getLock on windows e.g. returns null in the same situation.
      > > >
      > > > you might want to test on a different platform to further isolate the
      > > > issue.
      > > > you could also place a breakpoint at the top of the
      > > > RepositoryImpl#acquireRepositoryLock
      > > > method, step through the code, verify the contents of your fs etc.
      > >
      >

      === Original email

      On 2/19/07, Patrick Haggood <codezilla@> wrote:
      I'm using Linux, Sun Java 6 and Jackrabbit 1.3 with Derby persistance.
      I have a putNode(object) function that's giving the above error in unit
      tests. It always fails after the second update, even when I swap tests
      (i.e. save user doc then save user). Prior to each test, I delete the
      repository directory.

      Do I need to set explicit locks before/after each session.save()?

                          • Unit Test
                            DBConn dbc;

      public SessionUtilTest(String testName)

      { super(testName); dbc = new DBConn(); }

      // Note - putUser and putDocument both use putNode after determining
      which rootnode will be used

      /**

      • Test of putUnityUser method, of class unityjsr170.jr.SessionUtil.
        */
        public void testPutUnityUser() { System.out.println("putUnityUser"); UnityUser usr = usr1; SessionUtil instance = dbc.getSutil(); String result = instance.putUnityUser(usr1); assertNotNull(result); usr = (UnityUser) instance.getUnityUserByID(result); assertEquals(usr1.getName(),usr.getName()); }

      /**

      • Test of putUnityDocument method, of class
        unityjsr170.jr.SessionUtil.
        */
        public void testPutUnityDocument() { System.out.println("putUnityDocument"); UnityDocument udoc = adr1; SessionUtil instance = dbc.getSutil(); String result = instance.putUnityDocument(udoc); <---- File Lock Error assertNotNull(result); udoc = (UnityDocument) instance.getUnityDocumentByID(result); assertEquals(adr1.getName(),udoc.getName()); }
                      • Here's where I setup my repository connection

      public DBConn(){
      sutil = null;
      try

      { rp = new TransientRepository(); sutil= new SessionUtil(rp); }

      catch (IOException ex)

      { ex.printStackTrace(); }
      }

      public void shutdown(){ sutil.closeAll(); }

      public SessionUtil getSutil(){ return sutil; }

      **************** SessionUtil

      public SessionUtil(Repository rp){
      try { session = rp.login(new SimpleCredentials("username","password".toCharArray())); } catch (LoginException ex) { ex.printStackTrace(); }

      catch (RepositoryException ex)

      { ex.printStackTrace(); }

      }

      public void closeAll(){
      try

      { session.logout(); }

      catch (Exception ex)

      { ex.printStackTrace(); System.out.println("Error closing repository"); }

      }

      // Put a node on the tree under the root node, return the uuid of the
      new or updated node
      private String putNode(String nodetype, UnityBaseObject ubo){
      String resultuuid =null;
      String uname = ubo.getName();
      String utype = ubo.getType();
      String objectuid = ubo.getId();
      Node pnode; // node to add or update
      Session ses = null;
      try {
      ses = getSession();
      // Does updateable node already have node Id?
      if (objectuid==null)

      { Node rn = ses.getRootNode(); pnode = rn.addNode(utype); pnode.addMixin("mix:referenceable"); }

      else

      { // grab existing node by uuid pnode = ses.getNodeByUUID(objectuid); }

      // Did we get an updateable node?
      if (pnode!=null)

      { ubo.setId(pnode.getUUID()); String unityXML = utrans.getXMLStringFromUnityBaseObject(ubo); // update all the properties pnode.setProperty("name",ubo.getName()); pnode.setProperty("type",ubo.getType()); pnode.setProperty("xmldata",unityXML); ses.save(); resultuuid = ubo.getId(); }

      } catch(Exception e)

      { e.printStackTrace(); }


      return resultuuid;
      }

      private Session getSession()

      { return session; }
                            • repository.xml

      <Workspace name="${wsp.name}">
      <FileSystem
      class="org.apache.jackrabbit.core.fs.local.LocalFileSystem">
      <param name="path" value="${wsp.home}"/>
      </FileSystem>
      <PersistenceManager
      class="org.apache.jackrabbit.core.state.db.DerbyPersistenceManager">
      <param name="url" value="jdbc:derby:
      ${wsp.home}/db;create=true"/>
      <param name="schemaObjectPrefix" value="${wsp.name}_"/>
      </PersistenceManager>
      <SearchIndex
      class="org.apache.jackrabbit.core.query.lucene.SearchIndex">
      <param name="path" value="${wsp.home}/index"/>
      <param name="useCompoundFile" value="true"/>
      <param name="minMergeDocs" value="100"/>
      <param name="volatileIdleTime" value="3"/>
      <param name="maxMergeDocs" value="100000"/>
      <param name="mergeFactor" value="10"/>
      <param name="bufferSize" value="10"/>
      <param name="cacheSize" value="1000"/>
      <param name="forceConsistencyCheck" value="false"/>
      <param name="autoRepair" value="true"/>
      <param name="analyzer"
      value="org.apache.lucene.analysis.standard.StandardAnalyzer"/>
      </SearchIndex>
      </Workspace>

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              • Assignee:
                stefan@jira Stefan Guggisberg
                Reporter:
                phaggood Patrick Haggood
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                • Created:
                  Updated:
                  Resolved: