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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