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From "Stefan Guggisberg (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (JCR-912) OverlappingFileLockException using DerbyPersistenceManager
Date Wed, 16 May 2007 16:11:16 GMT

     [ https://issues.apache.org/jira/browse/JCR-912?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Stefan Guggisberg reassigned JCR-912:
-------------------------------------

    Assignee: Stefan Guggisberg

> OverlappingFileLockException using DerbyPersistenceManager
> ----------------------------------------------------------
>
>                 Key: JCR-912
>                 URL: https://issues.apache.org/jira/browse/JCR-912
>             Project: Jackrabbit
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.3
>         Environment: Linux + Java6; however, per http://blogs.sun.com/DaveB/date/200612,
this may be a problem on all Java6 platforms
>            Reporter: Patrick Haggood
>         Assigned To: Stefan Guggisberg
>
> 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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