recovering potentially corrupt data

Hi,

Is there any utility out there that can recover the data from a collection.

Is it at all possible to do this at all?

One particular collection has "gone bad". The rest of the db is working 
great.
I am unable to query it or create a collection within it.

I get a null pointer exception from the data.

thanks

Rohit

java.lang.NullPointerException at 
org.apache.xindice.core.filer.BTree$BTreeNode.query(BTree.java:937) at 
org.apache.xindice.core.filer.BTree$BTreeNode.query(BTree.java:937) at 
org.apache.xindice.core.filer.BTree.query(BTree.java:221) at 
org.apache.xindice.core.filer.BTreeFiler$BTreeFilerRecordSet.(BTreeFiler.java:191) 
at 
org.apache.xindice.core.filer.BTreeFiler.getRecordSet(BTreeFiler.java:174) 
at 
org.apache.xindice.core.Collection.listDocuments(Collection.java:1007) 
at 
org.apache.xindice.server.UglyBrowser.getHierarchy(UglyBrowser.java:157) 
at org.apache.xindice.server.UglyBrowser.doGet(UglyBrowser.java:78) at 
org.apache.xindice.server.XindiceServlet.doGet(XindiceServlet.java:82) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740) at 
javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247) 
at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) 
at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260) 
at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) 
at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) 
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) 
at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) 
at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) 
at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) 
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) 
at 
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415) 
at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180) 
at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) 
at 
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170) 
at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641) 
at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172) 
at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641) 
at 
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:509) 
at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641) 
at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) 
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) 
at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174) 
at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) 
at 
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) 
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) 
at 
org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223) 
at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:432) 
at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:386) 
at 
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:534) 
at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:530) 
at java.lang.Thread.run(Thread.java:534)