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From "Patrick Haggood (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-912) OverlappingFileLockException using DerbyPersistenceManager
Date Fri, 11 May 2007 13:13:15 GMT
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


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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