jvm level Deadlock between 2 threads accessing the same connection

Threads working with embedded derby get deadlocked.
Thread dump:

Found one Java-level deadlock:
=============================
"http-8080-13":
waiting to lock monitor 0x09d1a37c (object 0x9560fcd8, a org.apache.derby.impl.store.raw.data.BaseContainerHandle),
which is held by "dwc.ma.MAJobsManager:dwc.ma.MAManager"
"dwc.ma.MAJobsManager:dwc.ma.MAManager":
waiting to lock monitor 0x09d1a57c (object 0x93da0180, a org.apache.derby.impl.store.raw.data.StoredPage),
which is held by "http-8080-13"

Java stack information for the threads listed above:
===================================================
"http-8080-13":
at java.util.Observable.deleteObserver(Observable.java:78)

• waiting to lock <0x9560fcd8> (a org.apache.derby.impl.store.raw.data.BaseContainerHandle)
  at org.apache.derby.impl.store.raw.data.BasePage.releaseExclusive(Unknown Source)
• locked <0x93da0180> (a org.apache.derby.impl.store.raw.data.StoredPage)
  at org.apache.derby.impl.store.raw.data.CachedPage.releaseExclusive(Unknown Source)
  at org.apache.derby.impl.store.raw.data.StoredPage.releaseExclusive(Unknown Source)
  at org.apache.derby.impl.store.raw.data.BasePage.unlatch(Unknown Source)
  at org.apache.derby.impl.store.raw.data.OverflowInputStream.fillByteHolder(Unknown Source)
  at org.apache.derby.impl.store.raw.data.BufferedByteHolderInputStream.read(Unknown Source)
  at java.io.DataInputStream.readFully(DataInputStream.java:176)
  at java.io.DataInputStream.readFully(DataInputStream.java:152)
  at org.apache.derby.iapi.types.SQLBinary.readExternal(Unknown Source)
  at org.apache.derby.iapi.types.SQLBinary.getValue(Unknown Source)
  at org.apache.derby.iapi.types.SQLBinary.getBytes(Unknown Source)
  at org.apache.derby.impl.jdbc.EmbedResultSet.getBytes(Unknown Source)
  at dwc.ma.MAOrderProcessor.loadData(MAOrderProcessor.java:147)
• locked <0x91f211b0> (a java.lang.Object)
• locked <0x91f6a068> (a dwc.ma.MAOrderProcessor)
  at dwc.ma.MAOrderProcessor.generateBundlesForUser(MAOrderProcessor.java:538)
• locked <0x91f6a068> (a dwc.ma.MAOrderProcessor)
  at dwc.ma.MARequestProcessor$HBundleRequest.process(MARequestProcessor.java:239)
  at dwc.ma.MARequestProcessor.processRequest(MARequestProcessor.java:39)
  at dwc.ma.doProc.doPost(doProc.java:92)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:738)
  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
  at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
  at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
  at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
  at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
  at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
  at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
  at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
  at java.lang.Thread.run(Thread.java:595)
  "dwc.ma.MAJobsManager:dwc.ma.MAManager":
  at org.apache.derby.impl.store.raw.data.BasePage.releaseExclusive(Unknown Source)
• waiting to lock <0x93da0180> (a org.apache.derby.impl.store.raw.data.StoredPage)
  at org.apache.derby.impl.store.raw.data.CachedPage.releaseExclusive(Unknown Source)
  at org.apache.derby.impl.store.raw.data.StoredPage.releaseExclusive(Unknown Source)
  at org.apache.derby.impl.store.raw.data.BasePage.update(Unknown Source)
  at java.util.Observable.notifyObservers(Observable.java:142)
  at java.util.Observable.notifyObservers(Observable.java:98)
  at org.apache.derby.impl.store.raw.data.BaseContainerHandle.informObservers(Unknown Source)
  at org.apache.derby.impl.store.raw.data.BaseContainerHandle.close(Unknown Source)
• locked <0x9560fcd8> (a org.apache.derby.impl.store.raw.data.BaseContainerHandle)
  at org.apache.derby.impl.store.access.conglomerate.OpenConglomerate.close(Unknown Source)
  at org.apache.derby.impl.store.access.conglomerate.GenericController.close(Unknown Source)
  at org.apache.derby.impl.store.access.conglomerate.GenericConglomerateController.closeForEndTransaction(Unknown Source)
  at org.apache.derby.impl.store.access.RAMTransaction.closeControllers(Unknown Source)
  at org.apache.derby.impl.store.access.RAMTransaction.commit(Unknown Source)
  at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.doCommit(Unknown Source)
  at org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.userCommit(Unknown Source)
  at org.apache.derby.impl.jdbc.TransactionResourceImpl.commit(Unknown Source)
  at org.apache.derby.impl.jdbc.EmbedConnection.commitIfAutoCommit(Unknown Source)
  at org.apache.derby.impl.jdbc.ConnectionChild.commitIfAutoCommit(Unknown Source)
  at org.apache.derby.impl.jdbc.EmbedStatement.resultSetClosing(Unknown Source)
  at org.apache.derby.impl.jdbc.EmbedResultSet.close(Unknown Source)
• locked <0x91f0b7d0> (a org.apache.derby.impl.jdbc.EmbedConnection30)
  at dwc.ma.MAStatsProcessor$UserStatsBundlesProc.run(MAStatsProcessor.java:117)
  at dwc.ma.MAJobsManager$Runner.run(MAJobsManager.java:84)
• locked <0x91fce338> (a java.util.LinkedList)
  at java.lang.Thread.run(Thread.java:595)

Found 1 deadlock.